Research progress of CBM utilization technology in mining areas

In order to solve the problems of single utilization way and poor economy of gathering and transportation utilization caused by high dispersion, low methane concentration and large fluctuation of gas volume of CBM gas source in coal mining areas, and improve the utilization rate of CBM in coal mining areas, the utilization technology of CBM in coal mining areas is studied based on the national science and technology major project. A utilization technology system of CBM in coal mining areas has been preliminarily formed, with the core of cryogenic liquefaction of oxygenated CBM, quality improvement of low concentration CBM, power generation and efficiency improvement of low concentration CBM, safe combustion of low concentration gas, and comprehensive utilization of ultra-low concentration gas regenerative oxidation. The utilization amount and the utilization rate of CBM in coal mining areas has been greatly improved. The utilization amount of CBM extracted underground has increased from 4.8 billion m³ in 2015 to 5.737 billion m³ in 2020, and the utilization rate has increased from 35.29% to 44.83%. With the acceleration of coal mine productivity concentration and the further increase of closed/abandoned mining areas in China, the problems of low methane concentration and unstable gas source in coal mining areas will still be the main factors restricting the further improvement of CBM utilization in coal mining areas. Therefore, this paper comprehensively combs the scientific and technological innovation of technical equipment for utilization of CBM in coal mining areas in recent 10 years, and expounds the latest research progress, technical indicators and application effects of main technologies. On this basis, in view of the new characteristics of high-intensity intensive mining and intelligent mine construction facing our country's coal mine under the situation of "carbon peak and carbon neutral", this paper analyzes the technical problems and solutions to be solved urgently in the development of CBM utilization industry in coal mining areas, and puts forward the optimization and development direction of CBM technology equipment in coal mining areas, which is dominated by the efficient gathering and transportation of decentralized CBM and the economic utilization of outgoing airflow gas, so as to provide technical reference for the efficient utilization of CBM.