低浓度瓦斯利用途径与自愿减排效益研究OA

Coal mine methane constitutes a significant source of methane emissions in China,with low⁃concentration methane accounting for a substantial proportion.However,due to challenges in utilization,large volumes are directly vented.To address climate change,China has released its first Coal⁃to⁃Energy Conversion(CCER)methodology for the coal industry and lowered methane emission limits for coal mines,encouraging the utilization of low⁃concentration methane.This paper delves into utilization pathways for low⁃concentration coal mine gas in China and quantitatively analyzes its voluntary emission reduction benefits.Research indicates that methane emissions from energy supply con⁃stitute a significant portion of China's total methane emissions,with low⁃concentration gas from coal mining ac⁃counting for a substantial share.Its direct venting represents a significant greenhouse gas emission source.Despite substantial advancements in China's gas recovery and utilization technologies in recent years—including the estab⁃lishment of a tiered utilization system and policy⁃driven growth in gas extraction volumes—low⁃concentration gas,par⁃ticularly de⁃gassed coal mine gas,remains a challenge for emissions reduction.Its extremely low concentration ren⁃ders utilization economically unviable,dampening corporate investment enthusiasm.This article reviews policy driv⁃ers for low⁃concentration gas reduction,analyzes primary utilization pathways including gas⁃fired power generation,gas concentration and purification,blending combustion,and gas oxidation for heat production,and compares these approaches based on gas concentration,emission volume,geographical location,and project profitability.Results indicate that China has achieved internationally leading levels in low⁃concentration gas purification,direct combus⁃tion,and power generation technologies.Using a coal mine employing regenerative thermal oxidation to treat 2％methane concentration as a case study,this paper calculates baseline emissions and project emissions in detail based on methodologies,concluding that the project achieves annual emissions reductions of 83525 tons of CO2e.Based on current carbon market prices,this project could generate annual carbon reduction revenues of 6.468 1 million CNY,with an investment payback period of approximately three years,demonstrating strong economic viability.However,low⁃concentration methane utilization projects still face challenges in securing stable gas sources,ensuring stable com⁃bustion and safe transportation,and establishing cooperative models between primary investors and coal mining enter⁃prises.To further advance the efficient utilization and emission reduction of low⁃concentration methane,it is recom⁃mended to strengthen unified project planning and policy support.Emission standards should be expanded from con⁃centration control to total volume control,while improving the methane Monitoring,Reporting,and Verification(MRV)system and emission data framework for coal mines.This multi⁃dimensional approach—addressing sources,processes,and oversight—will promote effective utilization of coal mine methane resources and contribute to achieving the nation's dual carbon goals.