School of Emergency Management and Safety Engineering, China University of Mining and Technology, Beijing 100083, China.
School of Mechanical-Electronic and Vehicle Engineering, Beijing University of Civil Engineering and Architecture, Beijing 102616, China.
Int J Environ Res Public Health. 2022 Jun 16;19(12):7408. doi: 10.3390/ijerph19127408.
CH is the second-largest greenhouse gas and has a significant impact on global warming. China has the largest amount of anthropogenic coal mine methane (CMM) emissions in the world, with coal mining emissions (or gas emissions) accounting for 90% of total energy industry emissions. The results of CH emission inventories from previous studies vary widely, with differences in the spatial and temporal dimensions of gas emission factors of belowground mining being the main points of disagreement. Affected by the policies of "eliminating backward production capacity" and "transferring energy base to the northwest", China's coal production layout has changed greatly in the past ten years, but the closely related CH emission factors have not been dynamically adjusted. This paper investigated 23 major coal producing provinces in China, obtained CH emission data from coal mining, calculated CH emission factors in line with current production conditions, and studied the reduction measures of coal mine gas emission. According to the CH emission data of China's coal mines in 2018, 15.8 Tg of methane is released per year in the coal mining industry in China, and 11.8 Tg after deducting recycling. Shanxi Province's CH emissions are much higher than those of other provinces, accounting for 35.5% of the country's total emissions. The weighted CH emission factor of coal mining in China is 6.77 m/t, of which Chongqing is the highest at approximately 60.9 m/t. Compared with the predicted value of the IPCC, the growth trend of CCM has slowed significantly, and the CH utilization rate has gradually increased. This change may be aided by China's coal industry's policy to resolve excess capacity by closing many high-gas and gas outburst coal mines. In addition, the improvement of coal mine gas extraction and utilization technology has also produced a relatively significant effect. This paper determines the distribution of methane emissions and emission sources in China's coal mining industry, which is useful in formulating CCM emission reduction targets and adopting more efficient measures.
甲烷是仅次于二氧化碳的第二大温室气体，对全球变暖有显著影响。中国是世界上人为煤矿甲烷（CMM）排放量最大的国家，煤矿排放量（或气体排放量）占能源行业总排放量的 90%。先前研究的 CH 排放清单结果差异很大，主要分歧在于地下采煤的气体排放因子在时空维度上的差异。受“淘汰落后产能”和“能源基地西移”政策的影响，中国的煤炭生产布局在过去十年发生了巨大变化，但密切相关的 CH 排放因子尚未进行动态调整。本文调查了中国 23 个主要产煤省，从煤矿开采中获取 CH 排放数据，计算出符合当前生产条件的 CH 排放因子，并研究了煤矿瓦斯减排措施。根据中国 2018 年煤矿的 CH 排放数据，中国煤矿每年释放 15.8Tg 的甲烷，扣除回收利用后为 11.8Tg。山西省的 CH 排放量远高于其他省份，占全国总排放量的 35.5%。中国煤矿开采加权 CH 排放因子为 6.77m/t，其中重庆最高，约为 60.9m/t。与 IPCC 的预测值相比，CCM 的增长趋势明显放缓，利用率逐渐提高。这种变化可能得益于中国煤炭行业关闭许多高瓦斯和瓦斯突出煤矿以化解过剩产能的政策。此外，煤矿瓦斯抽采利用技术的提高也产生了相对显著的效果。本文确定了中国煤矿开采业甲烷排放的分布和排放源，这有助于制定 CCM 减排目标和采取更有效的措施。
