Underground coal gasification process

New O, Xuzhou Mining, and the Mining Institute all have experimental projects that have been approved for implementation; however, I am not very familiar with the specific progress of these projects

Introduction to Newao’s underground gasification coal mining technology. Underground gasification coal mining involves the controlled combustion and gasification of coal underground, a process in which combustible gases are generated through thermal and chemical actions on the coal. This process integrates shaft construction, coal mining, and gasification, enabling the production of low-cost industrial gas and gas feedstocks for chemical synthesis, while leaving ash, gangue, and other residues underground to achieve clean coal mining. This technology has advantages such as safety, efficiency, and low environmental impact. New Energy is one of the first companies in China to develop coal in-situ gasification technology into an industrial application; it has established an industrial demonstration site for gasification-based coal mining in Ulanqab, Inner Mongolia, where gas production for power generation was successfully achieved in June 2009. The daily gas production has reached 300,000 cubic meters, with a total power generation of over 4.7 million kWh. This technology has enabled the continuous and stable gasification of air and oxygen-enriched carbon dioxide. The No. 2 gasifier has been in operation continuously for 30 months, and the gas production capacity of the gasifier can be adjusted; the output per gasifier can exceed 500,000 cubic meters per day. The calorific value of the gas ranges from 800 to 1,950 kcal per standard cubic meter, depending on the intended use of the product, while the energy conversion efficiency from coal reaches 60%. At present, a set of technologies for site selection, well construction, stable gasification, and environmental restoration with independent intellectual property rights has been developed, providing the technical foundation for industrial-scale expansion. I saw that the calorific value of the gas is relatively low