How is the requirement of boiler safety, environmental protection, agile, economy satisfied after mix into matching coal is burned, prevent mix into to burn light put out a fire and explosion of the chamber of a stove or furnace are caused when using inferior coal, burn technical experience to sum up communication in time to match coal mix into, discuss promotion to match coal mix into to burn technology and fuel intelligence to turn management, deepness digs mix into to burn latent capacity, utmost controls fuel cost, the problem that the boiler after solving mix into to burn faces and type of extensive matching coal manage brought influence, mix into matching coal is held to burn a seminar in Wen Zhou on March 20, invite 24 industry experts and technical officer to address reach answer doubt.
Summary:
Suffer coal market supply demand relations change and energy-saving fall the need of bad news, mix into of need of igneous power plant burns calorific volume low, sundry much inferior coal, mix to differring match coal to plant undertake changing operating mode, change coal is planted analysis, decide reasonable mix into burns scale limits, the aircrew boiler that burns a variety of inferior coal to mix into undertakes reasonable canal accuses, assure aircrew security while, implementation economic benefits is the biggest change.
Keyword:
Inferior coal, mix into is burned, move
Overview:
The low heat output of coal is in 4500 kilocalorie / under Kg can regard inferior coal as. The feature of inferior coal: Ash content [Aad] content is tall, fixed charcoal [FC] content is low, without ash dry base volatilize cent [Vdaf] content is tall, grey bate temperature [ST2-] easy on the low side, soot of the generation when combustion is bigger, most easy knot is anxious. The Sui Xingran with high burning point is contained to expect in inferior coal -- gangue is more, make inferior coal more inaccessible sufficient combustion.
Text:
Yangzhou the 2nd generate electricity #1 of finite liability company, 2 furnace are American BABCOCK&WILCOX company is made, for inferior furnace of drum of critical parameter, intermediate reheat, natural loop, , furnace of coal fines of half open air, light with mixed coal, heating surface falls " U " decorate, model is B&W-2000/18.56. Boiler employs odd the chamber of a stove or furnace, odd drum, balance ventilated, right strong combustion means. Milling system plays style continuously to be being pressed, match 6 middling speed to grind coal machine, model is MPS-89G. Burner uses wind 2 times dual class is adjustable come back burner drifting type.
One, coal plants coal classifies character:
1, Yangzhou the 2nd generate electricity coal of finite liability company plants characteristic:
Design coal plants: Soft coal of divine government office
School nucleus coal plants: Advance north soft coal
2, the influence of inferior coal:
(1) the influence of low calorific value
If the calorific quantity of coal is reduced, the actual coal amount that same boiler bear place uses increases, and to boasting type milling system continuously, wind force that carries coal fines place to need also increases accordingly, bring about the temperature level inside academic combustion temperature and furnace to drop, make of coal fines air current catch fire defer, combustion stability becomes poor, affect coal fines light, the calorific quantity of coal reduces what cause the casualty such as boiler flameout possibly still to happen. In the meantime, after coal fired quantity increases, of burner exert oneself suffer be restricted, after heating up wind force to increase at the same time, wind speed will increase, burner obstruction can increase more. Additional, the chamber of a stove or furnace carries on combustion blaze center, make temperature of boiler smoke evacuation elevatory, increase smoke evacuation to heat up a loss, at the same time boiler radiate heat exchange and scale of convection heat exchange are changed, convection heat exchange increases, decrease warm water quantity to increase. The heat after low calorific value enters furnace is inertial bigger, can cause steam lukewarm fluctuate substantially. And burn as mix into proportional increase, this kind inertial also increase subsequently, boiler efficiency will drop somewhat. Burn the different index such as scale, moisture according to mix into, coal fired quantity increases, influence milling only waste time raises; One, the rate of bad news report that 2 times wind scale change affects fan increases; Of smoke tolerance increase, of leeway rise cause obstruction of air intake air heater, air leakage to increase an influence to bring rate of report of fan bad news to increase. Ultimate effect generates electricity coal consumption, affect power supply coal consumption; The factory lifts compared to the same period with electric rate. Coal pledges change may cause the certain equipment of aircrew to full load moves and cannot restrict boiler to exert oneself. For example the change of the moisture of coal and grindability index can make short of of the machine that grind coal rated exert oneself; The ash content of coal increases or grey resistor character change may make of electric dust collector remove dust the effect suffers be restricted. When bad of coal qualitative hasten, boiler burns flabby, put out a fire, heating surface wears away aggravate and belt do not go up the accident such as bear happens subsequently, power plant accident stops use rate to increase, bring about whole electrified wire netting to exert oneself insufficient.
(2) the influence of high-moisture
The moisture influence to the combustion process of coal basically is reflected dropping the temperature inside furnace. The choice that moisture still affects milling system type, dry medium and of system transporting coal move, affect boiler combustion operating mode thereby. Moisture increases can increase smoke evacuation to heat up a loss. Raw coal moisture is affected to grinding coal machine mill to exert oneself bigger. The influence is dry exert oneself one of is heat up wind lukewarm, another element is dry dosage, the wind coal inside the machine that grind coal is compared will greaten, accordingly wind rate will increase, heat up wind force inadequacy. Dry exert oneself insufficient, outlet temperature is reduced, come when monsoon especially when the water outside coal increases, each pink canal meets the coal below hod, engine that grind coal appear the phenomenon that block a canal up, the machine that grind coal exerts oneself be affected. Sweep through undertaking falling exerting oneself moving blowing to grinding at present, reduced problem happening number effectively. Increase when raw coal moisture, convert smoke tolerance (by quantity of heat identical) increase, of smoke tolerance will increase influence rear obstruction. The water vapour content in flue gas increases, right empty beforehand implement microtherm corrodes odds to increase, produce pollution to SCR activator as a result of the water vapour in flue gas at the same time, affect SCR efficiency.
(3) volatilize the portion is affected to flaming
Low volatilize portion coal, catch fire not easily and burn. The action of wind is attached most importance to especially should. Of dc burner coal fines catch fire, basically be to rely on efflux to coil suck all round the gas of high temperature flue gas to wind powdery mixture heats. The basis is formulary:
Q=(Cr+V1Ck)(Ti-To)
- Cr, ck----------Fuel and airy specific heat;
- V1-------------Wind force of every Kg fuel (nm3 / Kg) ;
- To-------------At the beginning of gas pink mixture lukewarm;
- Q--------------Place of every Kg coal fines is requiring fervent amount.
- Can see, increase wind force in mixture of coal fines air, increasing fire to heat up accordingly, will make ignition process is deferred. Reduce wind force, can make heat reduces fire significantly, enrage in a same smoking consequently below the quantity, can heat coal fines air current quickly ignition temperature. But wind force is too small, because the meeting catchs fire to initial stage cannot get enough oxygen and react speed is decelerated, block up catchs fire continuity is patulous. This shows, catch fire from coal fines combustion consideration, correspondence is planted at certain coal, wind force has an optimal value, additionally one times wind force still should be coordinated grind coal, dry and carry coal fines requirement. Because show my factory to be given priority to in order to light with inferior coal and coal is planted changeful, need to be opposite wind force is timely adjust. Inferior coal ignition temperature is higher, accordingly, below the premise that makes sure coal fines conduit does not accumulate pink to block a canal up, should reduce proportion of momentum of wind air current as far as possible; Volatilize when component is higher, can rise appropriately some. Still answer to look attentively at the operating mode of going from place to place inside the chamber of a stove or furnace and combustion operating mode closely additionally, undertake be adjustmented in time. Tall volatilize portion coal, although combustible but open in milling system stop during reaching coal of the bitter fleabane that block coal up, nature of incidental milling system explodes accident, because this mix into is tall,volatilize cent coal raised taller requirement to job of milling system explosion proof. Especially when monsoon grinds coal machine entrance to block coal up, if stop not in time,grind, cause extremely easily grind the entrance coal spontaneous combustion is accumulated to catch fire inside the canal, if happen,grind the entrance to block coal up so, be sure to stop in time grind dredge. Light need strict control to grind outlet temperature with lignite, when the machine that grind coal halts use, need to manage to find time as far as possible grind coal machine and fill indolent in time. Coal of bitter fleabane of a machine giving coal is like when the aircraft that grind coal moves normally, need strict control to grind outlet temperature to be inside normal limits, prevent milling system to deflagrate the happening of the accident, make sure boiler security stability moves.
(4) the influence of high grey share
Because catch fire,defer, combustion temperature drops, flaming stability is relative poorer, combustion is adjusted undeserved, cause boiler flameout easily. Catch fire defer, move on blaze center, superheater is easy overheating cartridge igniter. This kind of circumstance has happened on most boiler. My factory is the most apparent expression is changing bear decreases Wen Shui the amount is variable and huge, automata is out of order, 2 reduce easy tape sufficient, the thermal drop after be being decreased is more than saturated temperature slightly to lowermost value, advocate Wenming of Wen Chao of lukewarm, superheater wall shows steam, when operating mode disturbs, do not have adjust effectively method, often need to will be decreased change a hand to move adjust go against safety to move.
Coal is planted ash content increases, send quantity of heat to reduce, receiving the premise that takes same negative charge to fall, needs coal capacity increases, bring about the machine that grind coal, fan to exert oneself then increase. Because ash content increases,bring about chroma of flue gas flying ash to increase, wear away according to experience formulary: 3 τ of ω of T=C η μ (G/m2) knowable, the wear extent and flying ash chroma, cube with flying ash velocity of flow becomes direct ratio. Flying ash chroma increases the flue gas after mix into is burned to bring about boiler heating surface to wear away directly add. Ash is accumulated to increase inside caudal flue on the other hand, stemmed passageway of one part flue gas, form flue gas corridor, also of aggravate heating surface wear away. At the same time empty beforehand implement easy jam, milling system easy breakdown. Quantitative change of knot broken bits is big, the odds that drop broken bits greatens, quantity walking along broken bits increases. Ash is bigger also than resistor change. Because the grey share of coal fired increases, empty beforehand implement voltaic rock, need is empty beforehand implement blow ash continuously, noumenon blows grey need to strengthen rear and water-cooling wall, blow ash to use up vapour to increase apparently. Ask as national environmental protection stricter and stricter, analytic coal pledges the influence to cost considers coal to discharge the influence of gross to boiler character even.
(5) the influence of tall sulfur portion
When mix into burns coal of tall sulfur portion, high above in the sky beforehand implement Leng Duan imports mural face temperature under temperature of acerbity dew point when, empty beforehand implement dew of knot of the generation on ripple board, the meeting is right after the knot is shown ripple board is formed corrode, conglutinate flies to ash in the meantime, cause flow path to jam.
Boiler is lighted with tall sulfur coal, wall of the water-cooling inside furnace compares easy occurrence high temperature to corrode. The discretion of portion of coal fired sulfur should is with convert sulfur portion accurate, light the existence inside the furnace when using tall sulfur coal gas of H2S of taller pH indicator, h2S and heat pipe produce reaction to form corrode, in mural face existence taller CO chroma, furnace is in charge of when temperature is higher, corrode rate to accelerate.
Boiler is lighted with tall sulfur coal, desulphurization bear increases, lime quantity is increased, at the same time meeting platoon gives off a large number of containing sulfur flue gas and contain sulfur environment of pollution of cindery coal ash contains sulfur flue gas to be caused to boiler equipment at the same time corrode badly cannot change.
(6) the influence of low grindability coefficient
Grindability coefficient jumps over big fuel to be ground more easily, criterion report of crocus bad news heals small, raw coal moisture heals big, crocus process is out of shape by brittleness transfer to be out of shape to plasticity, changed the grindability of coal, increased crocus energy to use up, grind coal to exert oneself to be reduced consequently.
(7) the influence with grey low melting point
Inferior coal plants grey melting point, be in commonly 1100-1200 ℃ , cause burned-out fire mouth, fire mouth extremely easily to written guarantee Jiao Jibing crosses region the knot is anxious, especially screen crosses area to written guarantee anxious meeting increases greatly (the temperature of passageway flue gas that screen crosses region is designed commonly in 1000-1300 ℃ ) , make decrease Wen Shui quantity to increase reach smoke evacuation temperature to lift. As a result of me mill the chamber of a stove or furnace exports smoke lukewarm on the high side, actual measurement of the on the spot when 600MW amounts to 1150 ° C, outclass design is worth 968 ° C, if can reduce the chamber of a stove or furnace to export smoke lukewarm, should alleviate anxious case of my factory bear. For the combustion process from coal fines, need has height of certain the chamber of a stove or furnace to satisfy combustion process to perhaps say the need of blaze length. The temperature inside furnace distributings is with this one height closely related, after temperature is burning to end basically only, ability can drop more quickly, grey bead just is had by the likelihood of cooling solidify, the height that if this crosses lowest to screen from burner upside,is in is lesser, so screen writtens guarantee broken bits is met too more serious. But measure the discovery when smoke of the chamber of a stove or furnace is lukewarm to cross an entrance to arrive to cross exit high from screen with appearance of radiation high temperature from the spot at present the smoke between Duan Zhi is lukewarm go up basically in same standard, the combustion process inside the furnace when the specification is exported to the chamber of a stove or furnace ends not completely still, this shows choice of this one height in design of my factory boiler and the characteristic not complete be identical that light the combustion character that plants with coal and ash; Too low excess air coefficient will affect grey melting point, also can promote the generation of knot broken bits. When fineness is too big, the thick bead in coal fines comes out easily to collide with mural face from the depart in air current already, also need longer time burning ashes and blaze length, because this brings about knot broken bits easily, reduce fineness appropriately, especially it is OK that superstratum grinds the fineness of coal machine to answer shorten time burning ashes and blaze length, reduce the chamber of a stove or furnace to export smoke lukewarm, be helpful for alleviating broken bits of the knot inside furnace.
(8) is affected with what attemper to bear
Coal of high-moisture, low calorific value, capacity of the fuel after mix into is burned increases considerably, except the influence unit high load capacity exerts oneself outside ability, to boiler combustion adjustment character also produces apparent effect, main show is heat inertial big, answer arrearage. Aircrew rises fall when bear, lukewarm wave motion of steam pressure, steam is bigger, mix into of partial high proportion burns aircrew advocate limits of wave motion of steam pressure force increases 1MPa, appear even advocate circumstance of the demote below steam temperature, although take full negative charge constrainedly, bring fan to leave degree more than 80% , difference of imports and exports is pressed be more than 8.5, cause very easily cause fan stall, safety of serious effect aircrew moves.
Electrified wire netting asks aircrew must cast AGC to move, when AGC moves, bear change rate is rapid, bear rises often fall, mix into is burned when proportion is high, make inferior coal because of grinding coal machine, dry rate giving pink is slow, powdery temperature is low, boiler combustion does not follow to go up bear changes, satisfy AGC rate and character requirement very hard, cause assessment n and charge of electricity.
(9) economy is affected
Burn an experiment according to mix into, former grey processing, power consumption, store cost of grey, to decoke raises, aircrew is insecure factor increase, considering integratedly union is current while adverse element is affected coal price quotations, the mark coal unit price that existing coal plants is 550 yuan / or so tons, burn lignite to be with mix into exemple, lignite unit price is 365 yuan / or so tons, mix into burns an advantage apparent, so reasonable control mix into is burned comparing is crucial.
3, inferior coal mix into burns specific canal to accuse:
1, storage yard, add a storehouse overall demand
- Volatilize the portion is absent inside normal limits should alone storage yard;
- Receive base water portion and volatilize the portion is absent inside normal limits should mix into matchs the storehouse just can be added inside normal limits, and mix into matchs must even;
- Storehouse of layer of hearth of in principle #1, 2 boiler is low a calorific value not under 5000kCal/kg,
- In principle enters furnace average sulfur portion should ≤ 0.9% ;
- In principle grey portion is more than the coal of 20% not to allow to add superstratum storehouse character;
- In principle hits caboodle coal not to allow to add rock-bottom storehouse;
- Coal of in principle cobble does not allow to add rock-bottom storehouse, and must not mix mix into together with the inferior coal, coal that make lot.
2, coal of combustion low calorific value note:
- After foretaste is burned, adjust deserve to compare, coal of mixed coal of the in principle after mix into matchs asks as follows character (receive base) : Volatilize portion not under 25% , water portion not prep above 22% , sulfur portion not prep above 1%
- Coal case is put according to coal yard after the value grows carry on, match coal by afore-mentioned requirements (the attention when matching coal matchs coal 3 times the uniformity of appearance affirms, reduce simple error of mixed coal coal) , if match coal means to cannot come true, report director of be assigned personal responsibility for;
- Fuel grows a requirement strictly to add a storehouse by the value, match coal to should ensure mix into matchs even. If match coal process to have any should grow a report in time to the value unusually, had made corresponding accident forecast;
- Generate electricity check of ministry make one's rounds is strengthened light those who use this coal to grind group of examinations, especially the caking property of coal and damp degree examination, prevent to be entered to coal machine, exit blocks coal up or sweep electric machinery unusual etc;
- Generate electricity check of ministry make one's rounds is strengthened light the burner that uses this coal to catch fire examination, the distance catchs fire when small negative charge especially broken bits of unusual written guarantee must not be not had all round 0.5m and burner more than;
- Generate electricity ministry attendant is strengthened light grind the appearance analysis of the group with this lignite, if grind coal machine,outlet temperature and wind force slant buy;
- General 2 times elegant demeanour is used go up less much allocation means, generate electricity ministry attendant is strengthened light the surveillance of intensity of burner fire check that uses this coal, coal check intensity under 50% should contact make one's rounds to hold on the spot to affirm. If on the spot catchs fire to slant really,lose out-of-the-way, attendant should be adjusted in time one, 2 times wind deserves to compare, can contact major to adjust when necessary; If on the spot catchs fire normal, seasonable connection overhaul processes igneous check; Generate electricity is ministry attendant pressed strictly? Prevent to grind coal explode inside machine technical measure? the requirement strengthens the machine that grind coal to run parameter to monitor, grind coal machine to open especially, stop, boast the demand control that sweep and develops indolent;
- Generate electricity a grey check accusing make one's rounds and check of equipment ministry spot are strengthened light those who use this coal to grind coal machine scraper and cobble hod examination, prevent to produce door of cobble hod flashboard to get stuck acerbity or cobble hod is fumy etc;
- Generate electricity when ministry ash accuses attendant to walk along cobble coal, must get collect accuses attendant to admit really, prevent to produce the machine that grind coal to wait into water unusual;
3, coal of high water portion plants mix into burns a note:
- After in principle lights what plant with coal of high water portion to grind coal machine mix into to burn receive integratedly base complete water portion controls ≯ 26% ;
- Fuel ministry is planted in the light of coal of portion of different batch high water add a storehouse, all need to notice its caking property, when discover leather belt sticks coal or answering coal quantity to increase apparently, seasonable announcement generates electricity the ministry has done machine giving coal to enter, exit defends a work;
- Before mix into burns coal of high water portion to plant, connection equipment ministry undertakes interior is checked grinding coal machine, confirm the element that without the influence safety of the machine that grind coal runs;
- Light during with Gao Shui portion coal is planted, personnel of check of make one's rounds should strengthen an examination to give coal machine leather belt and the carry that sweep electric machinery travel case, discover to coal machine exit jams ahead of schedule as far as possible, reduce the rate that jams to coal machine, convenient grind group restore to reserve as soon as possible;
- Light during with Gao Shui portion coal is planted, equipment ministry is due person specially assigned for a task is on duty, knock fetch down coal to be in charge of regularly, prevent to block coal up;
- If coal of high water portion is planted too damp (outside water is high) , bring about grind the group is frequent jam, consider to use bin shift mix into to cook kind (bin shift of in principle middle shift) and adjust mix into to burn scale. Bin shift time interval controls: Maintain those who plan bin shift to grind the group is much run above 8 hours;
- Mix into burns what coal of high water portion plants to grind group should keep successive move. If wait for a reason because of on the low side of rate of load condensate, bring about coal of high water portion to plant after adding a storehouse, fail to be lighted in time with, in open before grinding, should have made the preparation that knocks coal, once break coal to should beat bunker in time to on the spot (before machine giving coal imports the door paragraph) , ensure next coal are normal;
- If happen,grind group jam tripping operation unusual, should clear in time millstones puts coal; If undertook water is rinsed, still need to clear millstones puts water, prevent to grind group of roll after starting to skid.
- Attendant strengthens the leakage inside wind system relevant appearance analyses (be like: The accident that grind coal goes, cold when air door closes completely, through heating up wind friendly posture adjacent grinds wind of entrance of the lukewarm, machine that grind coal wind of coal machine entrance is warm comparative and qualitative differentiate leaks inside Leng Yifeng door the circumstance) , make one's rounds does inspection of the leakage outside enhancing wind system, discover disappear of overhaul of unusually seasonable connection is short of;
- Attendant controls the machine that grind coal strictly outlet temperature is controlled in 60 ℃
4, tall volatilize portion coal plants mix into burns a note:
- Tall volatilize portion coal plants storage yard, add a storehouse overall demand:
- Tall volatilize portion coal is planted should pile up alone, facilitate add a storehouse;
- Coal yard has been done prevent tall volatilize portion coal is planted spontaneous combustion works, the proposal piles up time does not exceed 20 days;
- Prohibit adding a storehouse " fumy " tall volatilize portion coal is planted, tall volatilize portion coal is planted the reentry after answering to be finished in coal yard processing when fume adds a storehouse all right;
- Fuel ministry should ensure tall volatilize portion coal is planted mix into matchs even (generate electricity the ministry is entered through grinding coal machine, outlet temperature change identifies) ;
- Tall volatilize portion coal is planted with low volatilize portion coal is planted undertake mix into is burned, after control mix into is burned receive integratedly base volatilize portion ≯ 29% ;
- Tall volatilize portion new coal is planted preferential use formula of recipe of middle-level storehouse mix into;
- Mix into is burned tall volatilize before portion coal is planted, the value is long should strengthen communicate with fuel. When if fuel monitor discovers,the means that mix mix into cannot come true, value of should seasonable report is long, adjust the pattern that add a storehouse by the daily requirement that add a storehouse;
- Mix into is burned tall volatilize the bunker storehouse that portion coal plants requirement ≮ 11m(puts coal to control) 440 tons;
- Mix into is burned tall volatilize before portion coal is planted, connection equipment ministry undertakes interior is checked grinding coal machine, confirm the element that without the influence safety of the machine that grind coal runs;
- Mix into is burned tall volatilize before portion coal is planted, major is burned to mix into tall volatilize fineness adjusts the machine grinding coal that portion coal plants appropriately; The attendant after adjusting strengthens the parameter such as electric current of the machine that grind coal, difference pressing, vibration and flying ash combustible surveillant, dog and appearance analysis;
- Mix into is burned tall volatilize before portion coal is planted, major is right inside corresponding burner, outside 2 times wind fender undertakes be adjustmented appropriately; The make one's rounds after adjusting is held should strengthen burner to catch fire examination;
- Boiler still should make sure system of laziness of the machine that grind coal is in normal equipment to use position:
- Mix into is burned tall volatilize the hand of vapour of laziness of the machine that grind coal that portion coal plants moves segregation door open, the others grinds hand of vapour of coal machine laziness to move segregation door to shut;
- Should discover operating conditions is unusual (if grind coal machine,outlet temperature rises quickly, be more than 90 ℃ ) when, affirm open of a powerful person of inert vapour electromagnetism, cause interior of the machine that grind coal in order to prevent temperature jump to deflagrate;
- The industrial water of laziness of the machine that grind coal rinses a hand to move the door to shut rigor;
- Attendant should strengthen the surveillance of igneous check intensity and burner laryngeal temperature, prevent to grind group of coal that add a storehouse to cause because of mixing to pledge not all. Discovery should stabilize boiler combustion instantly unusually, arrange personnel to affirm to examination of on the spot, decrease to grind wind force of the group to slant accordingly appropriately buy and increase wind small fender 2 times to slant buy. If discover combustion is flabby when, should cast oil in time to support combustion and make good record;
- Attendant should strengthen the machine that grind coal to enter, outlet temperature is surveillant, control grinds coal machine to import wind temperature ≯ 260 ℃ , the machine that grind coal outlet temperature is controlled in 65 ℃ , force of to load of hydraulic pressure of the machine that grind coal slants buy is 1Mpa;
- Personnel of check of make one's rounds should strengthen burner on the spot to catch fire the examination of the circumstance. If catch fire,the distance slants close, announcement attendant undertakes one, 2 times wind is adjusted accordingly; If catch fire,the distance still slants close, announcement major undertakes burner inside and outside 2 times wind plate washer adjusts;
- Personnel of check of make one's rounds should strengthen boiler heating surface to written guarantee the examination of anxious circumstance. Discover the place such as burner area or screen type superheater writtens guarantee Jiao Mingxian increases, except seasonable report attendant is strengthened outside blowing ash,
- Personnel of check of make one's rounds should strengthen pink of milling system air leak, leakage and leakage ash to check, prevent to accumulate powdery spontaneous combustion;
- Personnel of check of make one's rounds (include grey check accusing make one's rounds) answer cobble coal to run a circumstance to strengthen an examination, it is normal to ensure all of cobble coal measures moves, ensure without fume and spark, stop carry examination otherwise;
- In moving if happen,grind group jam tripping operation unusual, outside waiting for regular job except strong indolent, still should clear in time millstones puts water, prevent to grind group of roll after starting to skid;
- Attendant does good mix into to burn the accident expect that explodes inside the machine that grind coal;
5, low volatilize portion coal plants mix into burns a note:
- Low volatilize the coal of the portion is planted mix into matchs, after should controlling mix into to match receive integratedly base volatilize portion ≥ 24% ;
- Low volatilize the coal of the portion is planted before mix into is burned, fineness R90 control is in the machine grinding coal that major burns coal to plant to mix into 20% the left and right sides;
- Low volatilize the coal of the portion is planted before mix into is burned, inside the burner that major burns new coal to plant to mix into, outside 2 times wind fender undertakes adjustment, reasonable control catchs fire distance;
- Low volatilize portion coal is planted during mix into is burned, attendant is strengthened light with low volatilize the parameter of the machine that grind coal that portion coal plants is surveillant, especially igneous check;
- Low volatilize portion coal is planted during mix into is burned, make one's rounds is held strengthen light with low volatilize the burner that portion coal plants catchs fire examination, the key is to catch fire distance and blaze stability;
- The note of combustion tall culm:
- Reasonable match wind to be carried out regularly blow ash, leave appropriately big in go up a 2 second wind, make move below blaze center; Increase economizer and water-cooling wall area to blow ash appropriately
- Optimize decrease Wen Shui to adjust, abate ash portion is opposite high advocate the influence with warm vapor. When necessary the hand is moved increase the one amount that decrease water, strengthen metallic wall vapor is lukewarm, warm control and adjust; Strengthen boiler to see area of fire, each heating surface written guarantee of circumstance of broken bits of anxious, knot dog examination; Strengthen steam temperature control, pilot to dog analysis and optimize.
- Strengthen what coal plants to mix match mix into to burn management, if make the same score,tall culm is planted 9, add in storehouse of middle-level C, F normally more reasonable.
- The sampling that strengthens pair of coal that enter furnace analyses management, strengthen boiler to run the connection with coal assay, analyse the coal sample that enter furnace well and truly result announcement to run staff to boiler ahead of schedule, instructional moving staff adjusts combustion in time.
- Dog tall culm is planted combustion is adjusted, catch fire through control distance, raise fineness, raise burner to come back shed intensity to control boiler flaming stability.
6, the note of coal of combustion tall sulfur:
- Should join movement when sulfur portion achieves 2500 Mg/Nm3 above fan of the 2nd oxidation, in order to assure the oxidation result of sulphurous acid calcium, prevent the situation of occurrence dehydrate difficulty, rise to improve the function of desulphurization efficiency at the same time. Adjust amount of limestone size supply. When size of a limestone supply pump cannot satisfy moving need when, should start pump of supply of another limestone size in time, maintain absorb value of PH of the size inside the tower to be more than 5, maintain desulphurization efficiency to be more than as far as possible 90% ; When desulphurization efficiency under 90% when should report value monitor and desulphurization person in charge, when desulphurization efficiency under 88% should report director of sectional be assigned personal responsibility for.
- Those who assure system of the makings on limestone is normal move. Expect when limestone storehouse under 3m when, desulphurization monitor should choose the drier of inventory to join limestone storehouse, personnel of check of make one's rounds should be strengthened on the check of make one's rounds of makings system; Expect when limestone storehouse under 2m when, complementary pilot should report desulphurization in time be worth monitor of long, to decoke and desulphurization director, arrange every other of personnel of check of make one's rounds 1 hour to be carried to fighting at the same time inside next makings of relevant equipment and limestone measure go on a tour of inspection, discover blemish contacts overhaul processing in time; Expect when limestone storehouse under 0.5m when, complementary pilot should report desulphurization instantly be worth monitor of long, to decoke, grow by the value reach desulphurization to be in charge of director of report branch be assigned personal responsibility for, at the same time desulphurization monitor should arrange person specially assigned for a task or job fighting carry inside the makings on personnel of assistance, supervisory overhaul till limestone storehouse expects achieve 2 meters. Expect when limestone storehouse after achieving 2m, personnel of check of make one's rounds should be strengthened on the check of make one's rounds of makings system; Expect when limestone storehouse after achieving 3m, restore to expect to going up check of normal make one's rounds.
- The check of make one's rounds that strengthens limestone to make oar system works. Personnel of check of make one's rounds should make oar system go on a tour of inspection 2 hours every to limestone, discover blemish contacts overhaul processing in time, ensure every grind a muscularity of machine at 11t/h. Each value should use the opportunity with nightly a bit small negative charge will box of size of limestone of period of just a little is made full.
- When the class complementary pilot should ensure limestone pink makes oar system be in reserve goodly condition. Should grind engine occurrence trouble or have grind machine have not enough time to make a starch and fluid of box of size of limestone of period of just a little under 2.5m when, pink makes the limestone that start oar system; Become fluid of box of size of limestone of period of just a little when prep above 4.0m, stop limestone pink to make oar system.
- Expect when limestone pink storehouse under 4m when, complementary pilot should report desulphurization in time desulphurization monitor, enter by supplier of desulphurization monitor connection makings. Desulphurization monitor answers to expect limestone pink storehouse inside the shortest time raise 7m above.
- When the sulfur portion in flue gas amounts to 3000 Mg/Nm3 above, complementary pilot should report desulphurization the value is long reach desulphurization to be in charge of, the value is long should adjust coal in time to plant the means that add a storehouse will drop share of flue gas sulfur. If cannot be planted through adjusting coal,the means that add a storehouse drops share of flue gas sulfur, when the sulfur portion in flue gas amounts to 3000 Mg/Nm3 above, complementary pilot should arrange personnel of check of make one's rounds 4 hours every to use portable PH plan be opposite in on the spot serous density actual measurement; When the sulfur portion in flue gas amounts to 3500 Mg/Nm3 above, complementary pilot should arrange personnel of check of make one's rounds two hours every to use portable PH plan be opposite in on the spot serous density actual measurement. When the PH that absorbs tower size the value is less than 5 when should report desulphurization monitor, be less than 4.5 when should report a value to grow reach desulphurization director, if PH is worth,continue to show downtrend, and the value grows to cannot be planted through adjusting coal inside short time the means that add a storehouse will drop share of flue gas sulfur, the value is long should chase class to be reported up instantly, in order to ensure desulphurization system reachs the safety of its equipment.
- To the absorption with high density oar night should maintain the tower to come back with 4 stream child continuously the run mode of dehydration. Achieve 1185 Kg/m3 when the actual density that absorbs the size inside the tower, complementary pilot should arrange every other of personnel of check of make one's rounds two hours to be opposite in on the spot with portable densimeter serous density actual measurement; Should absorb density of the size inside the tower to achieve 1200kg/m3, desulphurization attendant should discharge the size inside corresponding tower box of past reason size; Should absorb density of the size inside the tower to fall to 1190 Kg/m3 when, stop to discharge size box of past reason size. Subsidiary engine is long should the basis is other the actual density that a few furnace absorb tower size, the choice carries the size inside accident size box the absorption to density lowest inside the tower (the density of this tower size must show downtrend and density is less than 1160 Kg/m3) . During this, desulphurization subsidiary engine is long reach desulphurization advocate the fluid that the value should pay close attention to accident size box closely change, complementary pilot should be passed absorb the kind that size carries inside the tower inferiorly to control fluid of accident size box to serous density ceaselessly, do not exceed 6.5m as far as possible; Answer to discharge accident size box in time below the case that permits in the condition empty.
- If absorb tower size density is exorbitant, and fluid of accident size box exceed 6.5m, complementary pilot should report desulphurization in time desulphurization monitor, moving value director of long, to decoke, the value grows to should report director of be assigned personal responsibility for and adjust coal to plant the means that add a storehouse will drop share of flue gas sulfur, because serous density is exorbitant,prevent cause dehydration difficulty or absorb the knot inside the tower to dirty.
7, coal plants low grindability mix into burns key note:
- Coal plants either batch low grindability after showing up, must check grindability coefficient (HGI) ;
- Light on the engine grinding coal that avoids to plan a gender to heavy repair in this year as far as possible with low grindability coal is planted;
- Light with low grindability coal is planted, grind force of to load of coal machine hydraulic pressure to slant accordingly buy is 1Mpa;
- Light with low grindability coal is planted, attendant must strengthen electric current of the machine that grind coal and difference to press the appearance that waits for parameter to analyse;
- In principle is lighted with low grindability new coal is planted amount to a week, need grinds coal machine to stop carry interior to check, the change of key roll wear extent;
- Use aircrew to stop carry opportunity, the wear out condition that equipment ministry requires to check conduit of the machine that grind coal, burner, coal fines and part of curved first class mainly is checked;
8, coal of low grey melting point plants mix into burns key note:
- Reduce fineness appropriately, especially it is OK that superstratum grinds the fineness of coal machine to answer shorten time burning ashes and blaze length, reduce the chamber of a stove or furnace to export smoke lukewarm, be helpful for alleviating broken bits of the knot inside furnace;
- Leave appropriately big in go up a 2 second wind, make move below blaze center;
- Undertake in time blowing grey operation, adjust the time that blow ash in time, blow ash to cause aggravate of knot broken bits not in time in case;
- Light when be being planted with coal of low grey melting point, personnel of check of make one's rounds should strengthen boiler heating surface to written guarantee the examination of anxious circumstance. Discover the place such as burner area or screen type superheater writtens guarantee Jiao Mingxian increases, except seasonable report attendant is strengthened outside blowing ash,
- Light when be being planted with coal of low grey melting point, collect accuses personnel of check of make one's rounds and personnel of grey check accusing make one's rounds to answer examination of broken bits of the bottom when the fault,
- 8, mix into burns worry overall demand:
- The overhaul before mix into burns inferior coal to plant must burn the machine that grind coal to have comprehensive examination to mix into. Key examination grinds coal machine interior to have whether can shut rigor without the dead band of going from place to place or whirly area, device that answer pink, fold to fender lamina in good condition have place of the pink that do not have leakage with the system; Cleared the exists possibly coal fines accumulation inside the machine that grind coal is nodded (the key checks wind entrance to expand section and place of cobble coal scraper) ;
- Mix into burns what inferior coal plants to grind coal machine to should be checked regularly, normal mix into is burned check cycle for by 10 days. The key checks air compartment to whether have coal the anxious, device that answer pink is active it is normal to make, and the machine that grind coal is folded wear away to fender lamina and blade point of view is proper.
- The machine that grind coal wind flashboard door (the locking that includes small oil to grind keeps apart the door) switch is normal, shut rigor, and heat up wind fender to shut rigor (judgement basis: After the machine that grind coal is kept apart, grind outlet temperature ≯ 70 ℃ ) .
- If tall volatilize portion coal is planted will light for a long time with, equipment ministry should have done the following work:
- The machine grinding coal that mix into burns inferior coal to plant adds outfit explosion proof door (consult peaceful city power plant and Nantong power plant) ;
- The CO of the machine that grind coal that restore or optimizes mix into to burn inferior coal to plant is surveillant;
- Restore or optimize the machine that grind coal to develop indolent way (condition of switch of inert electromagnetism a powerful person receives DCS to monitor) ;
If 5. is tall volatilize portion coal is planted will light for a long time with, what Department of Commerce purchases is tall volatilize portion coal is planted should satisfy the following requirement;
- Grey melting point not under 1200 ℃ ;
- Receive base volatilize cent does not exceed 35% ;
- Can grind coefficient (HGI) not under 50;
- Tall volatilize portion coal is planted coal maintains the level that stabilizes relatively in as far as possible character;
- Purchase tall volatilize what corresponding amount should purchase when portion coal is planted is low volatilize portion mix into matchs coal, contented tall volatilize portion coal is planted with 1:1 matching coalAfter mix into matchs receive integratedly base volatilize minute of ≯ the requirement of 29% ;
9, mix into is burned tall volatilize the machine grinding coal that portion coal plants is opened stay a demand
Mix into is burned tall volatilize the planted machine that grind coal should maintain a coal to move continuously as far as possible. When if need to need to stop truly because of the overhaul,be being ground, should stop this coal to plant before today in out of service of plan of the chance that grind coal add a storehouse, change add other coal to plant, what coal machine and corresponding bunker grind during halting use in order to assure is safe. Before this machine that grind coal is started again, bunker should be added first low volatilize cent coal is planted, wait for mix into is arranged to add again after it is normal to move tall volatilize portion coal is planted; If should be ground,be in tall volatilize portion coal is planted the need below not gone circumstance stops grind, answer to import machine giving coal flashboard door to shut, after coal of leather belt of machine giving coal goes empty, inform fuel undertakes Feng Cang works, personnel of check of make one's rounds should undertake every classes detecting to this bunker temperature regularly (every two) , make good record in log.
1. grinds coal machine to start
- The machine that grind coal warms coal of the cobble before grinding needs to be discharged clean, undertake powdery canal is blown sweep, surveillant pink is in charge of temperature to should be close to normal temperature, blow sweep ≮ 15 minutes or so, make sure each pink canal is expedite;
- The machine that grind coal warms door of big air cooling should open stage by stage when grinding, ventilated blow sweep, move section sirocco door to control the machine that grind coal stage by stage again outlet temperature rises stage by stage, control entrance wind is warm be less than 150 ℃ , grind export temperature rise to lead not prep above 5 ℃ / Min.
2. grinds coal accident to go
- Control grinds coal machine to enter the mouth 260 ℃ of wind temperature ≯ , 60 ℃ control temperature of mixture of exit wind pink; At the same time the requirement increases tasteful amount appropriately (slant buy is in 10 the left and right sides) ;
- Strengthen milling system to if wind of imports and exports is warm,run parameter, press the poor, Electromechanical that grind coal to flow, surveillance of each bearing temperature, coil temperature mixes the wind force, machine that grind coal analysis, discover unusually seasonable processing.
3. grinds coal machine to halt use
- The machine that grind coal stays carry to use normally shut coal machine to import the door, go empty to give coal machine the way of leather belt. Specific requirement is as follows: First door of air cooling of a standard-sized sheet, enter according to grinding coal machine, the change of outlet temperature adds up to manage control to reduce coal rate, exert oneself when the machine that grind coal under 20t/h when, shut coal machine to import the door, go empty to give coal machine leather belt, the machine that grind coal stays carry hind to be blown in time with air cooling sweep 15 minutes, ensure powdery canal is blown adequately sweep (through pink tubal temperature monitors) ;
- The machine that grind coal is urgent after halting use, close surveillance grinds coal machine to enter, pressure of interior of the outlet air temperature, machine that grind coal. If discover door of sirocco of entrance of the machine that grind coal is shut lax create the opportunity that grind coal entrance temperature is high, answer to contact overhaul processing instantly, fill vapour indolent to change processing when necessary;
- The machine that grind coal is urgent after halting use, movement cannot be joined afresh in the day, contact overhaul Qing Dynasty to give the remnant inside the coal machine, machine that grind coal coal for nothing on one hand, on the other hand every bunker that burns new coal to plant to mix into has a place twice lukewarm, had made corresponding record (spot desk Zhang has corresponding form) , discover bunker temperature should contact fuel Qing Dynasty unusually new coal plants the rest inside storehouse of empty raw coal;
- When giving coal machine corrective maintenance, the coal that during the machine that grind coal stops to move, must prohibit getting on leather belt of machine giving coal sends into the machine that grind coal inside.
10, milling system catchs fire beforehand case
- If mix into burns the milling that new coal plants,systematic happening catchs fire, undertake handling by the following measure:
- Urgent stop grind, it is normal to affirm the machine that grind coal places a powerful person, wind to keep apart the door to already was shut, shut each to adjust air door fender; Inform fuel of Feng Cang;
- Announcement spot has nothing to do personnel leaves all round the machine that grind coal;
- If igneous influence is minor, have put out a fire with equipment of spot put out a fire; If igneous power is greater, contact relevant personnel instantly, system of the milling that start catchs fire lash-up beforehand record order;
- When temperature of crust of the machine that grind coal refrigeration arrives after room temperature, can open the opportunity that grind coal, undertake in-house examination is mixed clear the job;
- After should checking manage clear to end, after affirming fixture is regular, just can throw the accident that grind coal to go;
4, equipment rationalize transforms a proposal:
1, the machine that grind coal adds a look
Because raw coal moisture is right the impact that mill of the machine that grind coal exerts oneself is bigger, because this needs to grind coal machine to undertake adding to middling speed fast add a look to transform, raise mill to exert oneself. The machine that grind coal is added fast when adding a look to transform, cooperate to undertake raising wind commonly lukewarm transform, can burn inferior coal scale according to mix into, choice 2-4 stage grinds coal machine, grind the coal machine roll, rotate speed that wear a bowl through rising, increase exert oneself. Undertake be transforminged accordingly to wind annulus and coal fines segregator at the same time, if increase rotate speed again, criterion form a complete set grinds coal Electromechanical machine to be needed add a look to transform accordingly.
2, raise heat wind is warm
Pass shift wind and 2 sector between wind board and arc board position, increase the heating surface area of wind side, promote wind outlet air temperature and wind force.
Can transform through air intake air heater raise its heating surface area, raise wind lukewarm.
3, fan
Can pass fan lamina efficient change transform, increase a diameter, improve fan work efficiency, increase fan to exert oneself.
When inferior coal mix into burns scale to increase, wind force suffers apparently in a limited time, fan needs to add a look to change model.
4, wind is in charge of
After the machine that grind coal exerts oneself to rise with ventilation, former once wind is in charge of shed ability to suffer be restricted, obstruction increases, wind is in charge of wear away to also increase, because this wind is in charge of,need to undertake corresponding spread is allowed, prevent grind, heat preservation transform.
5, burner
After coal fired quantity increases, of burner exert oneself suffer be restricted, can undertake to burner corresponding spread look is transformed.
6, establishment of explosion proof of milling system put out a fire
When because combustion volatilizes,dividing tall coal, question of control of milling system explosion proof is more obvious, because this must give mix into burn what inferior coal plants to grind coal machine to add outfit explosion proof door, restore CO to measure a place, perfect inert gase extinguishing system, perfect explosion proof establishment, grind problem of coal machine explosion proof with surveillant, control.
7, door of isolation of cold sirocco of entrance of the machine that grind coal
Door of isolation of sirocco of entrance of the machine that grind coal is shut not close, blow up what cause milling system extremely easily and open to what grind coal machine, stop the difficulty with be caused certain. Door of isolation of entrance air cooling is shut not close, will dry to milling system exert oneself, outlet temperature and wind force have the opportunity that grind coal bigger impact. Because this must is opposite,shut imprecise door of isolation of cold, sirocco undertakes changing transforming.
8, decrease Wen Shui conduit and attemperator
Light after using inferior coal, because scale of absorption of heat of radiate of the chamber of a stove or furnace decreases, scale of convection absorption of heat increases an influence to decrease warm water quantity to increase, metallic wall Wenyi exceeds bid,
9, automation control transforms Aimosheng
Because mix into is burned, affect the control quality of whole set, join movement in AGC, frequency modulation especially when, affect its rate to answer reach character requirement, need to optimize from the following respects:
(1) coal is qualitative corrective
The CCS that is based on instruction balance controls strategy, former static state, dynamic bear, curve of coal capacity control needs to undertake optimizing. Because lignite mix into is burned, with the fuel below bear quantity certainly will increases, former control curve cannot satisfy CCS to change in bear process, fuel is measured more the requirement that changes substantially. Can cause advocate vapour pressure, temperature fluctuates considerably, change bear rate is reduced, control character is exasperate. Should burn scale to reach through lignite mix into relevant change bear experiment decides new control curve.
(2) optimize milling system control of door of cold, sirocco
Bigger coal plants water content, ask to increase to grinding coal machine to heat up airing dry to exert oneself. In moving actually, may appear sirocco door a standard-sized sheet, the phenomenon that air cooling door shuts completely appears. Should optimize the control between door of cold, sirocco to concern, reduce scope of change of air cooling door. When necessary, still should consider to transform heat wind system, ensure enough dry wind to exert oneself.
(3) optimize reduce system of Wen Shui automation
Mix into burns brown coal, boiler smoke tolerance increases, convection heat exchange increases. Change in bear process, decrease Wen Shui automata pressure is greater, should strengthen appropriately change the make a present of before bear process is medium controls function, restrain vapour temperature to pass big wave motion ahead of schedule.
(4) bear answers ability optimize
Lignite mix into is burned, will cause what aircrew dictates to coequal bear to answer, need more fuel, the movement of the make a present of before adjuster is mixed is bigger, pressure wave motion is bigger, cause aircrew to be not stabilized, economy becomes poor. Because this needs to develop aircrew to eliminate the form of other accumulation of heat outside boiler according to each aircrew character, in order to get used to electrified wire netting the demand of frequency modulation. Be like: The steam engine accumulation of heat, extraction steam accumulation of heat, conduit accumulation of heat of aircrew of civil heat addition.
Increase frequency modulation boiler advocate the make a present of before accusing, be aimed at my province electrified wire netting especially frequency modulation range is bigger. Can stabilize in time advocate the wave motion that vapour pressure produces as a result of frequency modulation movement.
Dryer of 10 coal yard
Undertake adding inferior coal dry carry simple equipment, be like vapour dryer, microwave dryer.
Bibliographical reference
[1] Yangzhou the 2nd generate electricity 2 × 630MW of finite liability company inferior critical unit volume accuses to run regulations
[2] Yangzhou the 2nd generate electricity finite liability company 2 period the project moves groom teaching material, boiler fascicule
