Selection and application of sampling process for direct determination of gas content
To accurately grasp coal seam gas occurrence,in terms of gas content measurement results subject to different sampling methods,we carried out tests in the No.6 and No.7 coal seams of Bailing Coal Mine to analyze the best sampling methods during bedding drilling and cross-bedding drilling,so as to ensure the effectiveness of coal samples selection and further improve the reliability of gas content determination.In the sampling process of bedding drilling,deep hole fixed-point sampling method was obviously better than the method of coal powder sampling from air discharge hole.The gas content measurement error was controlled within 10%.Based on laboratory coal samples scanning analysis,deep hole fixed-point sampling method can ensure and screen effective coal particle sizes to the full extent,and reduce gas loss.In order to ensure the reliability of gas control,deep hole fixed-point sampling method will apply for the bedding borehole sampling,and a comprehensive sampling method will apply for cross bedding borehole sampling on the basis of coal seam thicknesses and coal power particle sizes.
gas hazardsampling processgas contentdeep hole fixed-point samplingparticle size of pulverized coal
万方数据
维普
