On November 28 before dawn zero hour 41 minutes, bridge of city of Zhang Jia mouth east lid town produces Ou Dacang near limited company of Cheng Hua chemical industry deflagrate. Bright fire is in before dawn 2 when put out basically 48 minutes, the accident causes 23 people death, 22 people to get hurt, ham old freight car 38, small-sized car 12. Spot of branch of classics environmental protection is monitored, the contaminant such as hydrogen of chloric ethylene, chloridize, chlorine all not check goes out, can decide did not cause contaminative effect to surroundings air.
Does lash-up government department go to Heibei to visit town of piece of members of a family " 11? 28 " deflagrate guidance of accident working group assists local accident board of inquiry, through perambulate spot, consult data, attune takes parameter and video, inquiry to concern expert of personnel, organization to begin technical analysis, preliminary find out an accident immediate cause is: Chloric ethylene of limited company of Cheng Hua chemical industry of Heibei of group of Chinese chemical industry enrages ark happening leak, the chloric ethylene of leak diffuses to go up to road of plant area grandfather, encounter bright fire to happen deflagrate, bring about park highway the 23 people death such as the driver that two side expect discharging car, 22 people are injured.
23 dead 22 injuries, the family of broken up, let the tragedy of person heartbreak. It is to deflagrate accident, it is danger is changed taste leak, expose again piece " the complexity of chemical industry and dangerous chemical safe production and austere sex " . How much to hand in " tuitional " just grow memory, how many heavy loss to give ability derive lesson? Life classics does not have turn from side to side, "Hill of safe responsibility overweight " do not reduce empty catchword.
What is chloric ethylene?
Chloric ethylene renown vinyl is chloric (Vinylchloride) , it is a kind of important monomer that applies at high polymer chemical industry, can make by ethylene or acetylene. For colorless, easy liquefaction, combustible gas, boiling point - 13.9 ℃ , critical temperature 142 ℃ , critical pressure 5.22MPa. Chloric ethylene is toxic substance, cancer of the liver and long-term and inspiratory with the contact chloric ethylene is concerned. It and air form explosive mixture, explosion limit 4% ～ 22% (bulk) , explode more easily below pressurization, what container must notice when lay aside carries is airtight reach nitrogen to seal.
What is to shine explode?
Shine explode, it is when combustible gas namely in the space with a not current air, after collecting certain chroma, once encounter bright fire or electric spark,can burn immediately expand produce explosion. Shine explode paroxysmal strong, fire harm sex is big, chang Moming shows sign before the accident, be less than 0.1 seconds even from the whole reaction course that produces an end, give people the time of reaction far from.
How does chemical enterprise prevent explosive accident?
One control and remove igneous cause
1 bright fire
(The bright a house where a fire started in 1) industry production should show manufacturing process is medium heat to use igneous etc with fire, maintenance igneous cause.
(2) heats when tinderbox is qualitative, should avoid to use bright internal heat as far as possible and use steam or other body holding heat. If must use bright internal heat, equipment should strict and airtight, firebox should part with equipment or appropriate is kept apart.
(3) is inside the workshop that has risk of fire, explosion, avoid to solder as far as possible exercise, the place that has soldering working wants and combustible the safe distance that the manufacturing facilities that explodes easily maintains certain; When if require the equipment that expects to production, full-dress tinderbox and pipeline,undertaking get angry works, answer to implement concerned provision strictly, those who ensure get angry works is safe.
(The vent-pipe of 4) chimney flying fire and car, tractor is eruptive, can cause the combustion of combustible, explosion. Accordingly, the combustion inside the chamber of a stove or furnace wants sufficient, chimney should have enough height; Car, procrastinate receive spark should be installed to go out on the vent-pipe of machine implement etc.
2 attrition and bump
The attrition of the rotational place such as machine bearing, ironware is bumped each other or iron makes a tool beat concrete ground level ground to wait to produce scintilla possibly, when the stock after conduit or container burst is ejective likely also because of attrition on fire. Because this wants to take the following step:
(1) bearing wants seasonable oiling, those who keep good is lubricant, often keep clear of adherent can light bilge.
(2) installation is in combustible explode easily the part that easy generation of the place strikes scintilla, the impeller that goes up like air-blower, should employ tin of copper of aluminum-copper alloy, Beryllium or beryllium nickel alloy; Bump a tool to be become with the steeliness of beryllium copper or copper facing; The equipment that metal of use special type makes should use inert gase protection to wait.
(3) is entered along with stock to prevent metallic spare parts happen inside equipment bump on fire, can install on the equipment such as disintegrator magnet segregator is cleared the ironware in stock.
(4) carries Cheng Youke to burn gas or want to take put down gently gently when combustible liquid container, gas cylinder, forbidden chuck, prevent to be bumped each other. Forbid to wear the shoe that takes nail to enter combustible explode easily workshop. Inside particularly dangerous place, the ground should use the laid of weak qualitative data that does not produce scintilla.
Scintilla of 3 electric equipment
Electric spark is the main reason that causes fire explosion accident, the property that because this wants a foundation,the section grade of explosion and fire man-trap and explosive pledge, wait to appearance of the electric power plant inside the workshop, instrument, lighting installation and layout, use explosion proof respectively, close, the measure such as segregation. Explosion proof is electric the type selecting of equipment want comply with relevant specification to carry out.
Cause of 4 other fire
Want to avoid the disaster that electrostatic, thunder causes: Surface of the facility that should prevent combustible stock and high temperature, conduit is conterminous touch; High temperature surface should have measure of adiabatic heat preservation.
5 prevent to run, risk, drop, leakage
(Of the stock in 1) production process run, risk, drop, leakage often is brought about combustible explode easily stock diffuses space, cause fire to explode thereby, because this wants,notice those who prevent equipment inside and outside to run, risk, drop, leakage.
(The leakage inside 2) valve, be being operated by accident is the main reason that causes the leakage inside equipment, besides the responsibility heart that strengthens operation personnel, improve an operation besides the level, the valve that still can install two to string in order to raise its sealed dependability.
(3) notices device is external leak includes conduit and pipe fitting are reached between conduit between of joint static sealed leak, valve, agitate reachs the machine pump leak that uses sealed part, and the trough that because handle the account such as out of control of undeserved, reaction,causes brims over with makings, strong makings to wait.
(4) is operated by accident to prevent, should besmear to all sorts of stock cop with so that different color is distinguished, introduce the valve that contains switch sign, adopt to important valve hang out one's shingle, impose the measure such as the lock.
