Technical system and prospects for precise methane extraction in the entire life cycle of coal mining under the goal of "carbon peak and carbon neutrality"

The resource endowment characteristics of "abundant coal, scarce oil, limited methane" in China determine that coal will remain the fundamental energy source, maintaining its predominant position. Realizing the green and low-carbon operation of the precise methane extraction technology system in the entire life cycle of coal mining is one of the key tasks for the sustainable development of the coal industry. In response to the new situation requirements of the "carbon peak and carbon neutrality" background and the technical challenges of carbon emission reduction at the source of methane in coal mines, with "quality improvement and efficiency enhancement, carbon emission reduction" as the core, and "precise methane extraction, green and low-carbon" dual objectives as the guide. With "process technology and equipment intelligent innovation" as the main line, based on the technical aspects of the complete process of coal mine methane extraction, the technology system of precise methane extraction in the entire life cycle of coal mining has been actively explored and constructed. It has realized the coordinated coupling of precise methane extraction, and green and low-carbon. A carbon emission reduction technology system has been formed at the source of coal mine methane with reliable technology - low-consumption equipment - safety and intelligence. Subsequently, five key technical issues were investigated: precise prediction of methane content - methane emission volume - methane "sweet spot" resource areas, precise pre-extraction of methane in the mining coal seam by the "time-sharing + partitioning" method, precise extraction of pressure relief methane from mining by the "regional segmentation + directional" method, precise extraction of methane from the "sweet spot" resource areas in abandoned mine, and "dynamic + intelligent" precise control of coal seam methane extraction. Finally, the future development directions of the precise methane extraction technology system for coal mining throughout its life cycle under the goal of "carbon peak and carbon neutrality" are elaborated, including the deep integration of "dynamic - transparent" coal geology and "intelligent - precise" methane pre-extraction, the deep integration of "dynamic - transparent" transport and storage area of pressure relief methane and "precise - regional segmentation" directional extraction, enhanced methane extraction technology of the methane "sweet spot" resource area through CO2 absorption and storage in abandoned mine, the integrated platform of "precise prediction - intelligent design, precise monitoring - intelligent assessment, precise diagnosis - intelligent regulation", and "Smart+" technology combining precise methane extraction - energy saving and emission reduction for equipment - green and low-carbon for mines. By implementing the precise methane extraction technology system for the entire life cycle of coal mining under the goal of "carbon peak and carbon neutrality", new ideas are provided for achieving methane precise extraction, green and low-carbon goals in China's coal industry.