Numerical Simulation Study on Law of Dispersive Pollution of Dust in Fully Mechanized Mining Face

Abstract

Aiming at the problem of dust movement in the fully mechanized mining work, a 3D model of the fully mechanized mining face was established based on the gas-solid two-phase flow theory based on the 3604 face in Chenbanzhuang Coal Mine. The FLUENT numerical simulation software was used to simulate and analyze the dust dispersion law of the fully mechanized mining working face. The results show that the wind flow in the fully mechanized mining face presents the “two zones and one zone” law, that is, the “low speed air flow zone”, the “high speed air flow zone”, and the downwind direction of the front drum of the shearer of the breathing zone height is a “high-speed air flow belt” with a length of about 20 m, a height of about 0.7 m, and a wind speed of about 2.64 m/s. The dust diffuses with the wind to the sidewalk on the working surface. At the height of the breathing zone at the center of the shearer, the wind direction is about 8 m, forming a length of about 15 m, a width of about 1.3 m, and a height of about 0.9 m. The dust concentration is about 1 157 mg/m3 to 1 731 mg/m3 high-concentration dust mass should be used as a key area for dust protection during coal mining.

Keywords

• fully mechanized working face
• numerical simulation
• dust concentration
• breathing zone height
• diffusion law