Research on dust distribution law and optimization of ventilation and dust reduction on fully mechanized heading face

Abstract

In order to determine influence of ventilation mode on dust distribution on fully mechanized heading face and explore dust reduction effect under different ventilation modes, the 209 fully mechanized heading face of Longde Coal Mine was taken as research object, and the software of FLUENT was used to simulate distribution of dust in the roadway and dust distribution law and dust reduction effect under combined pumping and pressure ventilation mode. Accuracy of numerical simulation was verified through field measurement. The analysis results show that the dust pollution in the roadway under the forced-in ventilation mode is serious, the area affected by dust is large and settlement is slow; the simulation results are basically the same as the measured dust concentration in the field, which virifies reliability of the numerical simulation results, and furthermore, the rationality of the established mathematical model and its parameter settings is explained; by comparing dust reduction effect of ventilation mode of long-pressure short-pumping and short-pressure long-pumping, the conclusion is got that the ventilation mode of long-pressure short-pumping has the best dust reduction effect when air outlet of the pressure cylinder is 5 m away from the working surface, and the dust concentration can be quickly reduced to below 6 mg/m3.

Keywords

• fully mechanized heading face
• dust distribution law
• ventilation and dust reduction
• long-pressure short-pumping ventilation mode
• short-pressure long-pumping ventilation mode