Abstract
Khe Cham coal mine is managed by Ha Long Coal Company TKV. Currently, Khe Cham coal mine is exploited from the ground up to 350 and is ranked III for methane. In 2008, a methane explosion at -168 level of the 13.2 coal seam of Khe Cham coal mine occurred, injuring 16 people and killing 8. In order to avoid gas explosions at mines like 2008, it is necessary to have appropriate solutions to eliminate methane accumulation in the pit paths. We have studied to determine the relationship between the level of methane emissions with the methane content in the coal seam and the bazaar’s mining output because of the methane content in the coal seam and coal mining output. These are the two factors that greatly affect the release of methane from the longwall. The paper used practical measurement, sampling, and analysis methods to determine the level of methane emissions from longwalls at different extraction levels of the 13.2 coal seam and determine the relationship between the methane drainage and the methane content in the coal seam and the exploitation output of the longwall. This relationship is expressed by the equation y = a.x2 + b.x + c (Fig. 2 and Fig. 3). The results will help with planning for mining and have specific solutions for diluting methane in the mine’s pit lines
Highlights
Khe cham underground coal mine is located in MongDuong town, CamPha city, Quang Ninh province, Vietnam
Based on the results of determining the% content of gases, the natural gas content of coal seams in Khe Cham mines, regulations on gas zoning according to the "Guidance on the method of document collection in the search - exploration, and mining, in 2002 of Vietnam Coal Industry Group - Minerals, Khe Cham 1 mines exist three gas zones, as follows: The Nitrogen-Methane Zone: mainly distributed from the surface up to + 40m; The methanenitrogen zone: mainly distributed from + 40m to -150m
Survey measurement data on the gas content of coal seams at different levels, the monthly coal mining output, and the ventilation of the longwall at coal seam 13.2 of Khe Cham coal mine 1 are presented at The following tables: 13.2-2 longwall (-25/-55 level), 13.2-5 longwall
Summary
Khe cham underground coal mine is located in MongDuong town, CamPha city, Quang Ninh province, Vietnam. The North, it borders on Duong Huy commune; The East, it borders on Quang Loai, Mong Duong commune; + The South, it borders on KheSim, Coc Sau, Deo Nai, Lo Tri; The West, it borders on KheTam coal mine Do not add any page numbers. In some places like Cao Son, the surface of the floating methane zone is up to + 50m, in the South of Da mai subdivision at -50m and gradually raised to + 50m in the southwestern part of the mine. In the part of Khe Cham, the methane zone is at -100m and sinks up to the Northwest
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