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What are the main methods for coal mine gas control?
First of all, it is necessary to ensure that the air volume at each air-using location is sufficient to prevent gas accumulation. Then there is high-intensity gas extraction, multiple drillings, dense drillings, and strict extraction. Regional gas control includes mining of protective layers and gas extraction of the coal seam (through layers, along layers), and local advanced extraction and discharge drilling. Through extraction, the gas content in the coal seam can be reduced, thereby reducing
Oct 23rd,2024
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What are the main methods for coal mine gas control?
What are the methods for coal mine gas control? Coal mine gas control is generally classified into air exhaust and extraction.
First of all, it is necessary to ensure that the air volume at each air-using location is sufficient to prevent gas accumulation. Then there is high-intensity gas extraction, multiple drillings, dense drillings, and strict extraction. Regional gas control includes mining of protective layers and gas extraction of the coal seam (through layers, along layers), and local advanced extraction and discharge drilling. Through extraction, the gas content in the coal seam can be reduced, thereby reducing the danger of coal and gas outbursts.
At present, the main means of prevention and control is to construct close-range through-layer drilling and pre-extract coal seam gas in combination with along-layer drilling. Usually, the method of increasing the extraction of coal seam gas in coal mines is mainly to increase the drilling density and reduce the drilling spacing to increase the gas extraction volume of coal seam drilling holes, but it greatly increases the construction volume and construction period of the drilling holes, and the cost will also increase exponentially.
Therefore, how to improve the utilization rate of drilling holes and thus provide a method for extracting coal seam gas by drilling holes along the layer with high gas extraction rate, economical and easy construction is an urgent problem to be solved.
