Study on dust suspension law in driving roadway with forced ventilation

Abstract

In order to improve the problems of high dust production, high coal dust concentration and poor working environment of workers in coal mine heading face, according to the theory of gas-solid two-phase flow and based on Fluent and other numerical simulation software, we establish the geometric model of driving roadway which is more consistent with the field practice. The standard k-epsilon turbulence model and discrete phase model（DＰＭ） are used to simulate the air flow field and dust suspension movement law of the forced ventilation tunneling roadway under different wind speed and positions of the air duct outlet. Research shows that the wind velocity mainly focuses on the lower side and diagonal of the pressure air duct with the increase of wind speed, and gradually forms a vortex area at x=3 m. The suspension time is shortened, the dust captured by the roadway side and roadway roof and floor increases, and the powder discharge rate and dust discharge at the roadway outlet increase. With the increase of the distance between the forced air duct and the working face, the diffusion is serious, the suspension time increases, the degree of trajectory disorder increases, and the dust discharge at the roadway outlet decreases, which affects the ventilation and dust removal efficiency.

Keywords

• forced ventilation
• driving roadway
• gas-solid two-phase flow
• dust
• suspension transport