| With the continuous improvement of desulfurization technology,more and more high sulfur coal mines will be mined,and the probability of accidents caused by abnormal enrichment of hydrogen sulfide gas in the coal seam and personal injury will increase.It was necessary to study the weight of the main control factors and put forward reasonable control measures to ensure the safety of coal mine production.In this thesis,B3+6+6 coal seam of Wudong coal mine was taken as the research object,and the causes of hydrogen sulfide gas in coal seam,the weight of main control factors,the new determination method of hydrogen sulfide content in coal seam and the comprehensive treatment measures of composite permeability enhancement and extraction measures were studied.?1?Based on the mechanism of formation of oilfield gas and coal seam hydrogen sulfide,through the study of geological conditions,coal quality data and coal sample element analysis,the results showed that the hydrogen sulfide gas in Wudong coal mine was mainly due to microbial sulfate reduction,and partly due to sulfate thermochemical reduction.?2?The microstructure observation,industrial analysis,sulfur determination,adsorption constant determination and reducibility analysis of the coal samples were carried out respectively.Finally,the influence of hydrogen sulfide gas on the main control factors was analyzed by the generalized grey correlation degree and its weight ranking was obtained.Finally,the reducibility index,adsorption constant,total sulfur content,BET specific surface area and burial depth were obtained.?3?According to the determination method of methane gas content in coal seam,a method for the determination of hydrogen sulfide content in coal seam was proposed.The hydrogen sulfide content in B3+6+6 coal seam of Wudong coal mine was measured in the field and in the laboratory by using a new method.Finally,it was determined that the hydrogen sulfide content in the coal seam was 6.83×10-5m3/t to4.5734-4m3/t.?4?Based on the occurrence of hydrogen sulfide in the coal seam,the compound permeability enhancement technology was used to extract coal seam gas.Inject the alkaline liquid in the anti-reflection hole to control the hydrogen sulfide gas.And adopt common management methods of advanced exploration,ventilation dilution and strengthening personal protection.The concentration of hydrogen sulfide was effectively reduced,and the treatment effect was good. |
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