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Phân tích nguyên nhân và đề xuất các giải pháp ngăn ngừa gia tăng nhiệt độ lò chợ mỏ than Khe Chàm III

Bài viết đề xuất các giải pháp hoàn thiện hệ thống thông gió, khoan, bơm ép nước vào khối than và xây dựng các tường chắn cách ly khu vực đã khai thác để ngăn ngừa ôxy hóa than và nhiệt độ trong khoảng không khai thác lan ra khu vực lò chợ. | 85 Journal of Mining and Earth Sciences Vol. 62 Issue 5a 2021 85 - 93 Analyze the causes and propose solutions to prevent an increased temperature of the longwall in Khe Cham III coal mine Chi Van Dao 1 Ha Xuan Tran 2 Quang Van Nguyen 1 1 Mining Faculty Hanoi University of Mining and Geology Vietnam 2 Vietnam Mining Science and Technology Association Vietnam ARTICLE INFO ABSTRACT Article history During the coal mining period in the fourth quarter of 2020 the air Received 9th Apr. 2021 temperature increased in mining areas and the survey results on the Accepted 29th Oct. 2021 current state of the longwall 14.5.20 at Khe Cham III coal mine showed Available online 1st Dec. 2021 that the air temperature rises to 320C and exceeded the permit Keywords regulation 300C of QCVN 01 2011 BCT. To a nalyze the relationship Airflow between oxygen adsorption capacity and temperature in coal samples Anealing temperature coal samples were taken at the head and bottom of the coalface. The result shows that the oxygen adsorption constant U25 0.0032 is the Khe Cham coal mine largest in the coal samples while the Russian standard for self-ignition of Longwall coal is U25 0.016. Therefore the coal samples of Khe Cham III coal mine Temperature. are low self-ignition. Thus it can be seen that the causes leading to the increase in temperature in the longwall 14.5.20 due to the compression of the road ventilation the only measured airflow is 7.68 m3 s while the required airflow is 16 m3 s. On the other hand due to the influence of thermal radiation from the surrounding rock the area has finished mining on the longwall and the road is narrow lead to the airflow is not small enough to carry this heat out. To ensure safety in the mining process when there are signs of increasing temperature from the mining areas. The article proposed solutions to complete the ventilation system drilling and pumping water into the coal face construct walls to isolate the exploited area to prevent oxidation of