Simulation Of Industrial Boiler Explosion Accident Consequences

As a kind of energy conversion equipment,boilers are widely used in national economic life in our country.However,due to the gradual increase in the number of industrial boilers in our country,the number of explosion accidents of industrial boilers has also gradually increased,causing severe economic losses and casualties,and even causing serious secondary explosions.Therefore,this paper studies the consequences of industrial boiler explosion accidents,which has reference significance for exploring the impact of boiler explosion load on the enclosure structure of industrial boiler house.This paper first analyzes the internal structure of typical industrial boilers.According to the differences of boiler explosion mechanisms,boiler explosion accidents are summarized into furnace deflagration accidents and boiler steam-water explosion accidents.It also expounds the disaster mechanisms of furnace deflagration accident and boiler steamwater explosion accident and the main manifestations of consequences of the two explosion accidents respectively.Then,FLACS software is used to simulate the deflagration process of combustible gas in the furnace,and the effects of gas concentration,gas type and boiler rated power on the explosion intensity of combustible gas are explored.The simulation results show that the explosion intensity of combustible gas in the furnace increases first and then decreases with the increase of gas concentration,and the maximum values are reached at about 1.0 to 1.1 times of their stoichiometric concentrations respectively.The explosion intensity caused by deflagration of different types of gas in the furnace varies greatly,and the explosion intensity index increases with the increase of boiler rated power.Then,the explosion energy of boiling liquid vapor explosion in boilers is analyzed.TNT equivalent method and TNO multi-energy model are used to explore the influence of boiler water capacity and boiler rated vapor pressure on the peak overpressure and impulse of explosion shock wave formed by boiler vapor-water explosion.The results show that TNO multi-energy model is more reasonable than TNT equivalent method in evaluating the far-field damage effect of explosion shock wave.The peak overpressure and impulse of explosion shock wave increase with the increase of boiler water capacity and boiler rated steam pressure.Finally,Monte-Carlo method is used to study the hazards of boiler explosion fragments.The simulation results show that the initial ejection velocity of boiler explosive fragments is only related to the properties of the fragments material and the structural size of the boiler,and has nothing to do with the mass of explosive fragments.For a certain boiler,it can be regarded as a certain value.Taking WNS2-1.25-Y(Q)horizontal fuel(gas)steam boiler as an example,the projectile range of explosive fragments is 900 m,of which nearly 50.0% of the explosive fragments fall between 450 m and 650 m.The smaller the number of explosive fragments generated by boiler steam-water explosion accidents,the higher the flight speed of the fragments.