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七尺煤(3~#)层是阳泉矿区主要开采层之一,煤厚2.1米左右,赋存稳定。煤质属无烟煤。煤层透气性低,沼气压力13公斤/厘米~2,沼气含量20.3米~3/吨。开采七尺煤层的北头嘴井和一号井均属高沼气矿井,具有煤和沼气突出。煤尘有爆炸危险。综合机械化采煤工作面推进速度快,产量高,煤尘生成量和沼气涌出量大幅度上升。1980年四季度全局回采工作面空气中含尘量平均为465毫克/米~3,最高达7175毫克/米~3,远远超过了《煤矿安全规程》的要求,严重危害人体健康,综采工作面的沼气涌出量由炮采和普机采时的10～15米~3/分,
Seven feet of coal (3 ~ #) layer is one of the main mining Yangquan mining area, coal thickness of 2.1 meters, stable occurrence. Coal is anthracite. Low gas permeability, biogas pressure 13 kg / cm ~ 2, biogas content of 20.3 m ~ 3 / t. The North Head Mouth and No. 1 wells that exploit the seven-foot seam are all high-biogas mines with prominence of coal and biogas. Coal dust explosion danger. Comprehensive mechanized coal mining face to promote fast, high yield, coal dust generation and methane emissions increased substantially. In the fourth quarter of 1980, the average dust content of air in the face of the global mining face was 465 mg / m ~ 3, up to 7175 mg / m ~ 3, far exceeding the requirements of “Coal Mine Safety Regulations” and seriously endangering human health. The amount of methane emission from the working face is from 10 to 15 m ~ 3 /