Study On Influencing Factors Of Coal Seam Gas Desorption And Compensation Calculation Of Lost Gas In Pingmei No.6 Mine

The accurate determination of coal seam gas content is of great significance to mine gas prevention and control,and the accurate calculation of the loss of gas in the process of measuring the coal seam gas content by the direct method is very important.The laws are also different,resulting in a large error in the calculation results of each loss gas compensation calculation model when used,resulting in a large deviation in the measured value of gas content.For this reason,in order to improve the accuracy of the determination of gas content in the coal seam of Pingmei No.6 Mine,representative coal samples were taken at the site of Wu ₈,Wu _9-10 and Ding _5-6coal seams,and 0.5MPa,1.0MPa,1.5MPa,2.0MPa adsorption was carried out.Desorption equilibrium pressure,1min,3min,5min exposure time,coal sample gas desorption experiments under the conditions of 20?,30?,40?.On the basis of analyzing the correlation of the current 16 loss gas compensation calculation models,9 representative formulas are selected.According to the different calculation processes of each formula,origin is used to curve the gas desorption law of different coal samples under different conditions.Fit,and calculate the fitting correlation coefficient R².Expand the regression analysis effect evaluation index,and introduce the error parameters MAE and MSE.Through the comprehensive evaluation of the three regression fitting effect indicators and the error value of the loss gas amount,the correlation coefficient R²,the mean square error MSE,and the mean absolute error MAE,the optimal loss gas compensation model is determined for each coal seam.In the end,the cubic model was selected as the best loss gas compensation model for the Wu ₈ coal seam,and the Qin Yueping model was the best model for the Wu 9_-10and Ding _5-6 coal seams.The maximum gas content in the test results applied to the sixth mine of Tianan Coal Industry in Pingdingshan is 5.20 cm³/g,6.98 cm³/g and7.12 cm³/g,which are basically the same as the original gas content,and the accuracy of the results is improved through the improvement of the loss model.,which has been well applied in the actual gas content determination.The thesis has 133 figures,29 tables,and 100 references.