Study On Mechanism And Hazard Control Measures Of Fire And Explosion Of Flammable Gas

In petrochemical industry,fire accident by flammable gas is more serious dangerous among all kind of fire accident,at the same time,this kind of fire is a difficult problem in fire control region in the world.Research aimed at fire and explosive accident caused by flammable gas in petrochemical is very important.It can help of developing disaster control system,preventing and controlling this kind of fire accident and reducing casualty.Based of the reasons above LPG(Liquefied Petroleum Gas) is selected to be studied.Conclusions of this article are:(1) LPG fire accident mechanisms and risk control mode is established;corresponding mode framework,methodology base and security analysis is given by this paper based on LPG fire and explosion accident mechanisms research.According to case and the research method,fire accident mechanisms and hazard control mode of a LPG storage and distribute station is given.Approaches are:three kind of hazard identification;FTA;aftereffect analysis of UVCE and BLEVE;ICI Mond fire,explosive,toxicity index assessment;hazard control research;Security research and conclusions.(2) Based on the method given by the research of LPG fire mechanisms:â‘ According to the three kind of hazard theory,hazard is identified in a LPG storage zone.The main danger substance is LPG which is the 1st class hazard;LPG reaches to a flammable concentration is the 2nd class hazard;management bug is the 3rd class hazard.â‘¡LPG tank explosion as the root of fault tree analysis,by FTA,not-to-happen approach is finding out.Furthermore,according to analyzing the structural importance factors of basic events,we know how dose basic events affect root of fault tree.â‘¢Qualitative analysis and quantitative analysis of the fire and explosion accident of LPG storage zone are researched.Main accident possibility occurs in LPG storage zone-UVCE and BLEVE accident consequence analysis.The result shows that UVCE and BLEVE accident will cause casualties and property losses over a considerable extent. Especially BLEVE is more serious.Quantitative analysis of LPG storage zone fire and explosion accident is made by ICI Mond fire,explosive,toxicity index assessment.Before and after safety precautions,prognostication of fire and explosion in LPG storage zone is given.(3) Combining result of hazard identification and not-to-happen approach,based of inherent safety theory,this article gives fire and explosion control measure and suggestion on Man-Machine-Environment and management aspects. â‘ Human fault control measure is established to preventing human fault,making fault harmless and controlling result.â‘¡Storage tank and facility control measure is mainly essence safty design;selecting high quality raw materialsraw materials;maintain tank and facility functioning well;ignition sources control.The main ignition sources are naked light,electric spark,static spark,strike spark,high temperature object,thunder spark and radio frequency electric.â‘¢Environment control measure is mainly improving and creating safety and comfortable working Environment to preventing human fault.â‘£Management control measure is mainly establishing safety system;strengthen safety education and train,safety check,etc.Simultaneity,corresponding emergency measure pointed to secondary accident is taken to minimize the casualty loss(4)Security analysis:Using designed safety control measure check list,check out the risk control measure.Result shows that the risk control measure is pertinence and effective. Safety assessment contrast between before and after risk control measure shows that taking risk control measure can descend the fire charge,explosion index,gas explosion index and colligation risk index.Risk control measure is effective;the measure can achieve the anticipated result.