Fire And Explosion Risk Analysis On The System Of Automobile Engine Hot Running Operation

With the improvement of people’s living standard, the car has gradually into thousands of households. As the heart of the car, a large number of different scale’s automobile engine manufacturer are created. But then, safety accidents happen frequently in the process of making automobile engine, especially the system of hot running operation, which has characters of long duration, severe gasoline volatilization, complex connection of electrical equipment and producing high temperature of flammable and explosive gas uses gasoline as the text driver, and also the oil depot locates in the outdoor, so various factors interact with each other, which lead to fire and explosion accident easily.This paper enumerates fire and explosion accidents of automobile engine and introduces the state of safety evaluation at home and abroad, fire and explosion accident is the main safety accident in the system of hot running operation according to hazard source identification based on Casualty Accident Classification Standard. This paper used the method-Fuzzy Analytic Hierarchy Process. In order to improve the accuracy and effectiveness of Analytic Hierarchy Process, this paper gets the model’s all indexes of each level based on the fault tree analysis. Borda method is also introduced to improve the accuracy of judgment matrix. The model of fire and explosion accident risk was constructed by Fuzzy Analytic Hierarchy Process: a case study of some enterprise’s hot running process on the workshop,and then, each index’s weight could be obtained through corresponding calculation method,therefore each index could be sorted according to its own weight. In the fuzzy evaluation stage, each bottom index’s membership degree and the fire and explosion accident risk level can be achieved,. This paper uses ALOHA to simulate the consequences of pool fire and BELEVE, controlling variable method are used to research the influence factors: leaking aperture, the leaking hole position and temperature influence to pool fire, and leakage,temperature and wind speed influence to BELEVE.The research shows that: the fire and explosion accident risk level D is 0.7087, so the fire and explosion risk on hot running workshop is extremely high; ALOHA shows that: people who is staying at the office building in the southwest and combined workshop in the west will die in 60 s when pool fire happens, people who is staying within 248 m will die in 60 s when BELEVE happens.