内错式顶抽系统瓦斯抽采规律的相似模拟实验

Experiment of internal system based on analog simulation

为提高内错式顶抽系统的瓦斯抽采效率,基于流体相似模拟理论,1∶10的几何比例焊接成工作面进行相似模拟实验,研究工作面内错式顶抽系统规律性,分析抽放风量与甲烷流量的关系、顶抽巷位置与回风甲烷流量和抽放甲烷流量的关系。结果表明:随着抽放风量的增加,由于"顺效应"和"逆效应"的影响,甲烷流量增加速率先提高后降低,存在最优抽放点;1、2、3 m位置的最优抽放风量为50、70、100 m^3/min,甲烷流量为0.475、0.644、0.580 m^3/min,电机功率为92、103、179 kW;2 m位置抽放风量为70 m^3/min时,甲烷流量增速最高点、耗能低,为系统最优点。该研究为瓦斯抽放系统设计提供了新思路。

This paper describes an experiment building on fluid analog simulation and using the 1∶10 ratio.The study works towards an investigation into the underlying law behind staggered top pumping system working in the coal faces and an analysis of the relationship between the drainage volume and gas content and the relationship between roof drainage roadway position and return air gas quantity and gas drainage amount.The results demonstrate that along with an increase in the drainage volume comes an initial increase and a subsequent decrease in gas rate due to the ＂smooth effect＂ and ＂reverse effect＂, suggesting an optimal drainage point;the location 1, 2, 3 m away from the return airway is observed to have an optimal drainage air volume of 50, 70, 100 m3/min;a gas content of 0.475, 0.644 and 0.580 m3/min, and a motor power of 92, 103 and 179 kW;the location 2 m away from the return airway, with the 70 m3/min drainage volume, makes the optimum point in the system, displaying the highest gas content and the lowest energy consumption and thus proving practicable and high-efficient.The research may provide a novel idea for gas drainage system.