| Dust explosion is one of the main threats to the safety of industrial equipment and human health during the process.Dust explosions often occur in the industrial production,transportation and storage of combustible dust.Due to the strong shock wave of the primary explosion,it is easy to cause secondary explosions.Once it occurs,it will cause a large number of casualties and property losses.Due to the differences in dust and explosion-related industries,the results of risk assessment vary widely,and it is difficult to truly reflect the accident risks existing in enterprises.It is impossible to quantitatively describe and classify the accident risks existing in enterprises,and it is impossible to compare the accident risks existing between enterprises,it cannot be managed and controlled on a macro and regional level.Therefore,it is very necessary to carry out dust explosion risk assessment research in industrial and trade enterprises.This paper takes the dust explosion risk assessment as the research object,selects the dust explosion risk possibility index,establishes the risk assessment index system,introduces the accident tree(FTA)and the event tree(ETA),establishes the bow tie diagram,and establishes a general dust explosion risk assessment model.Overcome the limitations of the bow-tie graph and transform it into a Bayesian network model for dust explosion risk assessment.(1)Establish a dust explosion risk possibility index system.Based on big data and analysis of past accident cases at home and abroad,the key factors of typical dust explosion risks of industrial and trade enterprises are excavated,and the results of dust explosion risk identification are comprehensively analyzed,and the elements involved in different dust places are described in a comprehensive and detailed manner.Establish a typical dust explosion risk assessment index system.(2)Establish a bow-tie diagram model and analyze the reliability of security measures.Combined with accident tree and event tree,a bow-tie diagram model is established,that is,a quantitative risk assessment framework for dust explosion.In this model,the underlying causes of dust explosions are identified based on their causal relationships.In addition,an analysis of the potential consequences of dust explosions and related safety measures is carried out to obtain the applicability and effectiveness of the proposed safety measures to reduce dust risks.(3)Establish a Bayesian network model and conduct risk assessment on dust explosion risk.Mapping from a bowtie graph model to a Bayesian network model.Through this model,the correlation between common failure causes and causes leading to dust explosions is studied,the risk of dust explosions is assessed,and the probability of potential consequences is analyzed.Introduce the risk consequence level standard,evaluate the dust explosion risk of industrial and trade enterprises,quantitatively calculate the dust explosion risk level,predict the risk according to the safety measures taken in the enterprise safety management,modify the Bayesian network,and finally provide the dust explosion of the industrial and trade enterprises.Provide the basis for the classification management and control of explosion risk. |
