Coal chemical industry explores new models of energy conservation and emission reduction

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Coal consumption accounts for 67.7% of China's total energy consumption, and the carbon dioxide emissions it produces account for 81% of the country's total emissions. Using new coal chemical technology, carbon dioxide that needs to be temporarily emitted can be separated and concentrated during the production process, which can lay the foundation for underground storage of carbon dioxide in the future. 　　With the rise of domestic coal chemical projects, the issue of carbon dioxide emissions has attracted attention both within and outside the industry. Experts suggest that coal chemical companies should actively choose the model of emission reduction and carbon dioxide utilization during development. 　　It is understood that coal consumption accounts for 67.7% of China's total energy consumption, and the carbon dioxide emissions it produces account for 81% of the country's total emissions. According to Dr. Lin Quan of China Shenhua Coal-to-Liquids Co., Ltd., the process of replacing oil with coal to produce traditional petrochemical products is generally accompanied by the adjustment of the hydrogen/carbon atomic ratio, thereby emitting a large amount of carbon dioxide. For example, the production of 1 ton of methanol emits about 2 tons of carbon dioxide, the production of 1 ton of olefins emits about 6 tons, and the production of 1 ton of oil products emits about 8.8 tons. according to * * According to the preliminary plan of the National Development and Reform Commission's "Medium and Long-term Development Plan for the Coal Chemical Industry" (draft for comments), by 2020, the development scale of coal-to-liquids will reach 30 million tons/year, the scale of coal-to-olefins will reach 8 million tons/year, and the scale of coal-to-methanol will exceed 60 million tons/year, and the carbon dioxide emissions will exceed 200 million tons/year. 　　Currently, the amount of carbon dioxide used is far from balanced with emissions. Injecting carbon dioxide into oil fields to increase crude oil production is one way, but most coal chemical companies are far away from oil fields and must use long-distance pipeline transportation, which is not economically feasible. In addition, temporarily storing carbon dioxide underground or on the seabed is a realistic and feasible option. Separating, capturing and concentrating carbon dioxide into a liquid state that is easy to store is a key link and the most expensive step. Many abroad * * This plan has begun to be implemented. In 2003, my country also began to test carbon dioxide storage technology and explore experience. 　　According to Professor Tian Hengshui from the School of Chemical Engineering of East China University of Science and Technology, carbon dioxide is an important carbon chemical raw material that can be synthesized into a variety of fine chemical products. Vigorously developing carbon dioxide green utilization technology is expected to eradicate or significantly reduce carbon dioxide emissions from the source. In recent years, with the successful development of high-efficiency and high-quality catalysts and the improvement of copolymerization technology, many polymer materials with excellent properties can be synthesized using carbon dioxide as raw material, such as polyisopolymer, polyether, aliphatic polycarbonate, etc. 　　However, at present, my country's traditional chemical industry still largely uses backward coal chemical technology. For example, most of the nitrogen fertilizer industry uses intermittent gasification technology, which not only has high unit coal consumption and energy consumption, but also has high carbon dioxide emissions. according to * * Professor Fang Dewei, consultant of the Clean Coal Technology Planning Leading Group, said that using new coal chemical technology can achieve clean production, and a considerable proportion of carbon elements will enter the product, thereby significantly reducing carbon dioxide emissions. In 2006, my country's output of synthetic ammonia using coal as raw material was 44.3553 million tons, and the output of synthetic ammonia using intermittent gasification technology was 32.8944 million tons. If intermittent gasification is transformed with coal-water slurry gasification technology, the ammonia industry can reduce carbon dioxide emissions by 40.3755 million tons a year. 　　Ni Weidou, an academician of the Chinese Academy of Engineering, said that using new coal chemical technology, carbon dioxide that needs to be temporarily emitted during the production process can be separated and concentrated, which can lay the foundation for underground storage of carbon dioxide in the future. 　　Ni Weidou also believes that in order to reduce carbon dioxide emissions, polygeneration of coal, electricity, chemicals and heat is a feasible way. Collecting carbon dioxide with a concentration of 13% to 14% from the large-volume flow flue gas of conventional coal-fired power plants will consume a lot of additional energy and reduce power generation efficiency by about 10 percentage points. The polygeneration of coal, electricity, chemicals and heat can capture high concentrations of carbon dioxide during the entire process, and its energy consumption and cost are much lower than conventional power stations. This post was last edited by Zhenyouci on 2009-2-26 08:13 ]