Partition quantization of flow field and gas field distribution characteristics in"Y-type"ventilation working face
In order to research the flow field and gas emission law characteristics of a"Y-type"ventilation working face,a geometric model and balance equation for airflow and gas based on the Riemann integral principle were established.Taking the"Y-type"ventila-tion working face of Huoerxinhe as the research object,a quantitative zoning measurement method for the flow field was proposed.The spatial characteristics of the airflow distribution and air leakage of the"Y-type"ventilation working face were studied,and the composi-tion and distribution of gas emissions from the mining face were obtained.It was concluded that:①the average air leakage rate of the mining face was 8.31％.The airflow field of the mining face was divided into two sections.The 0-100 m section in front of the working face was a severe air leakage section requiring measures to reduce air leakage.Reverse wind phenomenon occured at 100-220 m of the working face,with small and stable air leakage.②The main source of gas emission from the working face was the coal wall and coal fall-ing,accounting for approximately 93.5％of the total gas.It was necessary to strengthen the pre-drainage of coal seam gas to reduce coal falling and coal wall gas emissions during production.③The gas concentration after hydraulic support was higher than that of the mining face,with a difference of 0.044％-0.148％.The closer the location was to the return air side,the greater the difference.It was neces-sary to pay attention to the gas concentration in the return airflow of the retaining roadway to prevent gas exceeding the limit.
"Y-type"ventilation working faceRiemann integralpartition quantizationair leakagegas
万方数据
维普
