Study On Construction Of Gas Leakage Scenarios And Evaluation Of Fire Emergency Leakage Plugging Capability

The complexity,clustering,and high incidence of derivative accidents of gas accidents have a huge impact on urban safety,and fire fighters,as the first-line personnel involved in gas accident disposal,urgently need to improve their gas emergency plugging capability to cope with the major challenges of gas safety brought by global problems such as overdue service,old city renovation,new city development,and seasonal problems such as dramatic increase in gas usage and reduced reliability of safety equipment and facilities.In this paper,through the statistical analysis of gas accidents,combined with the emergency leak plugging training platform,a gas leakage scenario is constructed,a gas emergency leakage plugging capability evaluation index system for fire fighters is studied,and a gas emergency leakage plugging capability evaluation system is designed.The main research contents and results are as follows:(1)Statistical analysis study of gas accidents.Statistical methods were used to analyze168 gas accidents in China between 2010 and 2022 in terms of time variation,regional distribution,gas types,accident subjects,accident consequences,and leakage point categories to obtain the current status of urban gas safety and the overall situation of gas accidents.The study shows that the number of gas accidents in China is at a “high fluctuation stage” and that it is necessary to focus on the prevention of gas pipeline leakage and explosion accidents in areas with high gas accident rates,such as Guangdong,and high gas accident mortality rates,such as Anhui,which may occur in June during the high period.(2)Gas leakage scenario construction research.Combined with the "environment-facilities-human" research and accident analysis results of the emergency leakage plugging training platform,twelve gas leakage points were designed and corresponding plugging tools were selected,four types of leakage scenarios were set for leakage model,leakage material,climate conditions and leakage points.On this basis,four types of leakage scenarios and 112 leakage sub-scenarios are constructed for vertical storage tanks,horizontal tanks,spherical tanks,and pipelines,making a useful exploration for increasing the practicality and systematization of gas emergency leakage plugging.(3)Gas emergency leakage plugging capability evaluation index research.The SRK model and the AHP method were used to establish the index system based on the SRK model.The "AHP + entropy method" was used to assign comprehensive weights to the indexes,and the weights were used to rank the importance of the indexes.The results show that the primary indicators have the largest weight of plugging training,the second largest weight of leakage detection training,and the smallest weight of perceptual identification.The secondary indicators have greater influence on the evaluation of gas emergency plugging capability by the degree of compliance of plugging action,selection of plugging tools and number of people,and plugging effect.(4)Design and application of gas emergency plugging capability evaluation system.The core functions of system management,online training,theoretical examination,scenario construction,and capability evaluation were realized,and the feasibility and accuracy of the index system and evaluation system were verified by fuzzy comprehensive evaluation algorithm.The results show that the gas emergency leakage plugging capability evaluation system is highly operational,accurate and reasonable,and provides a practical new tool for the online real-time evaluation of gas emergency leakage plugging capability,which has certain reference significance for other plugging training platforms.