One, destroy vacuum to be able to stop the principle of machine quickly
Destroy vacuum, the pressure that allows low-pressure crock to discharge steam side namely rises quickly, the enthalpy that reduces unit falls, do work ability is reduced greatly namely, have effect of apply the brake. Of the analogy say, come namely a slam the brakes on, reduce aircrew idle time greatly, reduce the possibility that equipment is endangered badly, move static friction for instance, water concussion, overspeed, when the casualty such as oily system breakdown.
What when to reduce aircrew low pressure lamina of crock end class is destroying vacuum, get commonly is powerful twist stress and attrition blast quantity of heat, be in commonly so in rotate speed under 2000 turn to be adopted below destroying vacuum still is relatively safe.
2, does vacuum of open lead plane destroy a powerful person to have rotate speed restriction?
Below critical condition, steam stops roll to make turbine rotor is quickened after machine tripping operation, use open vacuum to destroy a powerful person or family, destroy condenser vacuum. Will make cold air enters cylinder so, increase blast attrition loss, also be equal to the moment of force of apply the brake that increased pair of rotor, can reduce rotor idle time, stop quickly machine.
But rotor can get at the same time power of very great apply the brake, serious meeting brings about end class lamina to break off. Force of this apply the brake is concerned with rotor rotate speed already, also can say with aeriform density aeriform pressure is relevant again, the quantity of heat that rotate speed jumps over fast, pressure to jump over force of tall apply the brake to jump over big, generation is more also. Get power to restrict blade, the upper limit of the rotate speed when destroying open of a powerful person to vacuum undertakes formulary, in order to protect the security of blade, rotate speed of engine of steam of requirement of Shanghai turbine manufacturer under the influence is not had to steam engine when 400rpm, steam engine rotate speed under the vacuum harm to turbine is destroyed after 2000rpm already not quite.
3, the person that turbogenerator group encounters one of following cases, should urgent stop machine stop furnace, turbine destroys vacuum.
1.When turbine rotate speed exceeds 3300r/min to protect refus to move.
2.Turbogenerator group produces intense vibration suddenly to exceed 0.25mm, when protective refus is moved.
3.When turbine interior has clear metallic attrition sound or clash.
4.Axial displacement amounts to limiting value (＋ 1.0mm or - 1.0mm. ) or temperature of thrust bearing metal exceeds be restricted.
5.Lube is interrupted for oil or oil pressure drops to limiting value (0.06MPa) , reserve oil pump is started still disable.
6.Lube box oil level drops to limiting value (- 300mm) , filling oil is invalid.
7.Bearing of turbogenerator group either breaks oily, fume or temperature of metal of either journal bearing amounts to 113 ℃ , or temperature of thrust made of baked clay metal amounts to 107 ℃ . (measure bit of unusual except) .
8.Turbine produces water to pound, fluctuation crock difference in temperature exceeds 56 ℃ . Inside 10min advocate, reheat vapor is warm drop quickly 50 ℃ , extraction steam conduit calls the police into water and exceed tripping operation value.
9.Turbine axis Feng Yi often grinds sparkle.
10.System of steamer engine oil catchs fire, and cannot put out very quickly, serious minatory aircrew is safe.
11.Dynamo fume, catch fire, explosion.
12.The factory is lost entirely with report.
4, the person that turbogenerator group encounters one of following cases, should urgent stop machine, but do not destroy vacuum.
1.Of aircrew move to had endangered security of person, equipment, must stop machine when ability can avoid to produce accident of person, equipment.
2.Safety of direct and minatory aircrew runs hair unripe fire.
3.Important moving surveillance expresses turbine plan or device, show incorrect or invalidation, the step is inspected in extremelying He Jian.
4.Turbine EH oil pressure drops to 8.5MPa protection was not moved or leak of oil path happening cannot be kept apart.
5.Back pressure of the device that discharge steam is more than 65kPa.
6.The dynamo is serious and slack, when endangering safety to move.
7.The dynamo is sealed oily system breakdown, cannot maintain when moving.
8.Marvellous difference in temperature of dynamo stator line is big 14 ℃ or canal of stator pilot a ship into a harbour give water difference in temperature to amount to 12 ℃ , or when lukewarm component is being measured to temperature exceeds 90 ℃ or give water temperature to exceed 85 ℃ between lining of either stator chamfer.
9.When hydric purity is quick inside the dynamo drop 92% the following or hydric pressure drop quickly to be worth to floor level the following, and when cannot be being maintained.
10.Fire of severe retype of dynamo slip ring, when endangering equipment security.
11.When aircrew moves normally, advocate, reheat vapour temperature drops inside 10 minutes 50 ℃ .
12.Control DCS system when heat all operator stands when occurrence breakdown (all operator stand " Hei Bing " or " dead machine " ) , and without method of reliable mothball operation surveillance, short when when cannot restoring.
13.Advocate when transformer, excitation transformer, expensive plant transformer produces catastrophe failure.
14.When obtain condition of unit tripping operation and protecting refus to move.
