Study On Gas Extraction Technology In Fully-mechanized Face Of Xiqu Coal Mine

Gas is a threat to mine safety production, recognized as one of the three major greenhouse gases in the world, but gas is also one of the high-quality clean energy resources with high calorific value. Goaf gas governance is related to safety production of coal mine.This thesis states the background and significance of the subject according to the world energy situation and structure, new energy utilization, carbon emission reduction and mine gas governance.The theoretical research and technical background of study includes gas migration theory and gas extraction technology. The thesis states the research status and the relationship of gas transport and gas extraction. As the starting point of the gas basic features of storage and transport, the basic law of migration and the basic form of the flow field, the two main migration characteristics of goaf gas——float and spread——are illuminated. This thesis analyzes main goaf gas collecting areas and points out critical areas of goaf gas extraction.The 18202 fully-mechanized face, Xiqu Mine, Xishan Coal Electricity Co.,Ltd., was taken as a prototype, and its actual rock characteristics and mechanical parameters was used as modeling original condition after a reasonable simplification, obtained control parameters of Xiqu Mine 18202 face current seam and high fracture zone gas drainage program, to provide basic data for it.Combining with the actual situation, the article identified Xiqu Mine 18202 face current seam and high fracture zone gas drainage program, determined the drill field and drillings layout. Through collation and analysis to the extraction records of several months, we can draw the following results: the implementation of Xiqu Mine 18202 face ro current seam and high fracture zone gas drainage technology program achieved the certain expected results, extracted goaf gas resources, reduced goaf gas poured out to the coal face, decreased gas transfinite of the upper corner and the return air, and promoted the coal face producting safely and efficiently.