Determination of methane content and methane released when exploiting longwall at different levels at 13.2 seams, Khe Cham coal mine, Vietnam

Underground Mining Department, Hanoi University of Mining and Geology, Vietnam

^* Corresponding author: nguyenvanthinh.hl@humg.edu.vn or nguyenthinhtkv@gmail.com

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