Abstract
In order to reveal the explosion propagation law of lignite dust in 20L spherical explosion test device, the dust diffusion behavior and explosion propagation characteristics of lignite were studied by experiment and numerical simulation. The propagation process of dust explosion is studied by using high-speed camera and 20L spherical explosion test system, and the process of dust diffusion and explosion is simulated by using FLUENT software. The results show that the explosion propagation of lignite dust in the 20L spherical explosion test system has four different stages: the first explosion stage, the full explosion combustion stage, the continuous combustion stage and the combustion attenuation stage. The test results are slightly different from that of the fluent simulation of lignite dust explosion by using the high-speed camera to collect the dust explosion images. Results within the allowable error range, the experimental image of explosion combustion of lignite dust is well connected with the simulation results, which has a good display effect on the explosion propagation of lignite dust.
Highlights
With industrial development, combustible dust explosion accidents occur frequently, dust explosions very destructive, causing serious casualties and economic losses of property
This article has studied in detail the flame propagation characteristics of lignite dust in a 20L spherical explosion container,and Starting with the nature of the explosion,an experimental simulation and comparative study on the flame propagation of lignite dust was carried out
The first stage is the initial explosion of dust into the explosion tank, and the duration of this stage is about 14ms
Summary
Combustible dust explosion accidents occur frequently, dust explosions very destructive, causing serious casualties and economic losses of property. Dahoe[4,5]used three different types of nozzles for comparative experiments,and discussed the experimental research results of turbulent attenuation in a 20L closed ball container. Most of the flame propagation research is concentrated in cylindrical explosion containers,and there is little research on dust explosion in space. This article has studied in detail the flame propagation characteristics of lignite dust in a 20L spherical explosion container,and Starting with the nature of the explosion,an experimental simulation and comparative study on the flame propagation of lignite dust was carried out. The experiment was conducted using a 20L spherical explosion test system and a high-speed camera[6]. The installation location of the 20L spherical explosion test system and high-speed camera is shown in fig..The lignite sample used in the experiment was ground, screened and dried. P is the static pressure, g j and Fj is the neutral volume force and other volume forces, Fj as well as other model source terms or custom source terms, and ij is the stress tensor
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