Study on the Diffusion Law of Ultrafine Aerosol Particles in Goaf of Typical Fully Mechanized Mining Face
In order to study the fire prevention and extinguishing potential of ultrafine aerosol particles in underground confined space,the migration and diffusion rules of five kinds of ultrafine aerosol particles with particle size of 1-20 μm in the goaf of typical fully mechanized mining face were studied by CFD numerical simulation.The results show that the particle size is negatively correlated with the maximum effective diffusion distance and the maximum stagnation time of the particles.The maximum diffusion range and the maximum stagnation time of the particles with a particle size of 1 μm are 210.48 m and 2 212 106 s,respectively.The injection position of ultrafine particles has a significant influence on the migration and diffusion of particles in the goaf,and the vortex center at the inlet corner has a two-sided influence on it.The injection pressure of ultrafine particles is positively correlated with the diffusion range and negatively correlated with the stagnation time of particles.The particle injection effect is the best when the injection pressure is 2.25 MPa.The maximum stagnation time of particles in the goaf is 3 429 449 s,and the maximum effective diffusion range is 198.32 m.The porosity of the goaf is positively correlated with the diffusion range of ultrafine particles.When the porosity is 0.2,the maximum diffusion range is 49.99 m,and when the porosity is 0.4,the maximum diffusion range is 119.88 m.The research results can provide a theoretical reference for mine fire prevention and control.
Ultrafine aerosol particlesCoal spontaneous combustionGoafMigration and diffusion lawNumerical simulation
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维普
