Top-coal Gas Drainage System on Top Coal in Fully Mechanized Caving Face

Abstract

A fully mechanized caving face supporting top coal gas extraction system comprises hydraulic supports. A top beam is arranged on the tops of the hydraulic supports, a groove is formed in the middle of the top beam in the length direction, a supporting main pipe is arranged below the top beam, an extraction hole communicated with the groove is formed in the top beam and connected with the supporting main pipe through a supporting branch pipe, the top beam is provided with at least one partition board in the length direction of the bottom surface of the groove, the partition board separates the groove to form extraction grooves, and ventilation groove holes enabling all the extraction grooves to be communicated are formed in the two sides of an upper end of the extraction hole of the top beam. According to the system, the fully mechanized caving face gas concentration can be reduced, the transfinite gas condition is reduced, the extraction rate and the yield of a working face are improved, the system has promotional value in national coal mine, fully mechanized caving face safety conditions are improved, the yield of coal is increased, and economic and social benefits are remarkable.

Description

technical field [0001] The invention belongs to the technical field of underground gas drainage in coal mines, and in particular relates to a fully mechanized caving face frame-loaded top-coal gas drainage system. Background technique [0002] In the past 30 years, my country's comprehensive mechanized top-coal caving mining technology has been developed through several stages of introduction, promotion, improvement, and improvement. Top-coal caving hydraulic support and supporting equipment, high-yield and high-efficiency automation technology and equipment, gas control, etc., due to the significant advantages of top-coal caving mining with shortened coal mining preparation period, high coal mining efficiency, and less roadway excavation rate, etc., in It has been widely used in our country. Especially since 2000, fully mechanized caving mining technology has basically replaced layered fully mechanized mining and has become the main method for mining thick coal seams in stat...

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Problems solved by technology

[0011] 2) The gas concentration in the gas discharge lane is very high, often reaching or even exceeding the explosion limit. Although strengthening management can ensure that there is no equipment and no personnel in the lane, if the coal seam is in danger of spontaneous combustion, the safe production of the mine will be seriously affected;

[0012] 3) It cannot completely solve the problem of gas exceeding the limit at the coal outlet in the fully mechanized caving face. Although the gas discharge lane diverts a considerable part of the gas and reduces the gas concentration of the working face, the upper corner and the return air lane, the layout of the gas discharge lane On the upper roof of the working face, the impact on the gas at the coal outlet inside the working face is small, and the problem of gas exceeding the limit of the coal outlet still exists

[0016] 1) The amount of gas drainage drilling construction is large, and sometimes it is necessary to construct the drilling chamber at the same time. When encountering difficult-to-drill coal seams, the length of the drilling is limited; the gas drainage takes a long time and often interacts with production and excavation. Sometimes it even affects the progress and production of mining face;

[0017] 2) In coal seams with poor air permeability, the gas drainage effect often fails to meet the requirements, and if necessary, coal seam anti-permeability projects need to be constructed in advance

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