Construction Of Typical Accident Scenarios Of Chemical Installations And Design Of QRA Risk Analysis Platform

Chemical installations usually need to produce,store and transport a large number of flammable,explosive and toxic hazardous chemicals in the process of enterprise operation.Once material leakage occurs,it is easy to cause fire,explosion and intoxication accidents,resulting in casualties and property losses.The petrochemical industry is a high-risk industry.Hazard identification and risk assessment of chemical installations play an important role in controlling risk and preventing major accidents.QRA is currently the most widely used and systematic method for risk assessment of chemical installations in the world,which are usually completed by professional QRA software.Based on the demand of petrochemical enterprises to establish QRA risk analysis platform with independent intellectual property rights,this paper studies from three aspects : accident scenario construction,consequence model algorithm design and QRA platform design.The main contents are as follows :(1)Construction of typical accident scenarios of chemical plant.Building a complete and credible accident scenario is the basis and key for quantitative risk assessment.The accident scenario of QRA software has been verified by a large number of practices,and it is representative and typical.By comparing and analyzing the typical accident scenarios of QRA software,the general scenario of standard QRA analysis and two special scenarios of spray release and waterfall are obtained.For spray release,the liquid rainout calculation model was established based on droplet motion and evaporation equation.For cascade flow,the vapor cloud analysis method based on HSE RR908 is used to calculate the vapor release rate.(2)Consequence model algorithm design and performance test.For the calculation of leakage,fire,vapor cloud explosion and gas dispersion in the general scenarios,the appropriate consequence calculation model is selected.According to different analysis purposes,each type of model has multiple output types.According to the model and formula,the algorithm is designed and the algorithm flow chart is drawn.The performance test of the algorithm is carried out by case calculation.The output of the relevant model algorithm is in good agreement with the general QRA software.(3)Design of QRA risk analysis platform for chemical plant.On the basis of accident scenario construction and model algorithm development,combined with the analysis needs of petrochemical enterprises,the function design,calculation process design and prototype system design of QRA risk analysis platform are carried out,which provides reference for the development of enterprise risk analysis platform.