How efficient coal mine methane control can benefit carbon-neutral target: Evidence from China

Coal is expected to remain the primary energy source in China for the foreseeable future. Utilizing the methane released during the mining process through effective coal mine methane (CMM) control technologies can provide triple benefits in terms of safety, energy, and the environment, thus contributing to carbon neutrality goals. However, few studies evaluated the status and benefits of CMM control. In this study, we quantify emissions, statistical extraction, and utilization of CMM to evaluate the current status of CMM control in China. Gas accidents, avoided coal consumption, greenhouse gas (GHG) emission reductions, and carbon trading revenues were used as indicators to assess the contribution of CMM controls to China's carbon neutrality goals. The results show that a total amount of 22.86 Tg methane was generated in 2020, of which 7.26 Tg was extracted, and out of that extracted amount, 5.46 Tg of methane was effectively utilized. Since 2005, CMM control has effectively ensured the safe production of coal mines, and the CMM utilized can replace 53.21 million tons of standard coal consumption and reduce GHG emissions by 958.55 TgCO2e. Furthermore, if methane were strategically included in carbon trading markets, it could generate 52.26 billion CNY in revenue. This research provides valuable scientific guidance for CMM control, CBM development project benefit assessment, and policymaking in China.

Automated summary

Coal is expected to remain the primary energy source in China, and effective coal mine methane (CMM) control technologies can provide multiple benefits in terms of safety, energy, and the environment. However, there have been few studies evaluating the status and benefits of CMM control. This study quantifies emissions, extraction, and utilization of CMM to assess the current status of CMM control in China.