Research Of Explosive Pressure Of Combustible Gas In Horizontal Pipe

In industrial processing, severe damages are usually caused by explosive pressure in explosion accidents. Therefore, a detailed and systematic research on the varying rules of gas explosive pressure and its related parameters will help provide a more solid foundation for explosion-proof and counter-explosion measures.In this paper, the current research status about combustible gas explosion was introduced, both within and outside China, to give an account of the major characteristic parameters of inner-pipe explosions. By selecting two combustible gases of different chemical activeness as the research targets to be experimented, this paper intends to research and analyze the explosive pressure of combustible gases and its varying rules of pressure diffusion.Based on the horizontal pipe experiment devices, a testing system of combustible gases explosive pressure is set up. A experimental research of acetylene and methane, which are two combustible gases of different chemical activeness, is carried out. Referring to the theoretical calculation values, the maximum explosive pressures of those two gases when they explode are measured. In order to find out how much the length of the pipe can influence the maximum explosive pressure of combustible gases, there different of pipes are adopted in the experiment. In the 0.7m pipe, sensors are installed so that a research about how the different locations of sensors will influence the measurement of the explosive pressure of combustible gases can also be carried out. The results of the measurement include such data as the maximum explosive pressure of both combustible gases and the time span to reaching that maximum explosive pressure. The data indicate that the more active the combustible gas is, the more effective the reaction of the combustible gas is, the higher the explosive pressure is as well and therefore the more dangerous the explosion will be. This paper also makes a comparison between the inner-pipe tube axial pressure and radial pressure, based on which, the influential effects of the reflection waves made by combustible gases on the diffusion of fire are also studied. Methane, the less active gas, has a kind of reflection wave that chokes back fire more effectively, and a phenomenon of fire-counteraction is also observed. Whereas the acetylene, the more active gas, has a reflection wave that has a smaller influence on the speed of fire diffusion during the process of the diffusion the explosive fire.The research above will enrich the explosion theory of methane and acetylene and provide reference for the pipe-explosion-proof and the gas-explosion-proof theories.