关键词: 焦炉气, 碳氢资源, 生命周期分析, 碳减排潜力, 焦钢耦合

Abstract:

China’s coke production amounts to 4.73×10⁸t million tons, and the by-production of coke oven gas is about 2×10¹¹m³. Coke oven gas is rich in hydrocarbon resources such as H₂, CH₄, and CO. Its effective utilization and integration with the hydrogen energy demand of upstream and downstream industries are expected to generate significant carbon reduction benefits in the industry chain. This study constructs a spatial geographic coordinate and production capacity database of coke enterprises nationwide and conducts material flow and carbon flow analysis for typical coke enterprises. It systematically compares the environmental impacts, carbon emission reduction benefits, and hydrocarbon resource utilization efficiency of different utilization paths of coke oven gas, and proposes optimized strategies for the utilization of coke oven gas. The results show that the concentration of coking enterprises in China is relatively low. Shanxi is the province having the largest number of independent coking enterprises, with an a scale of less than 2×10⁶t. Hebei, Liaoning, Jilin and Jiangsu have steel and coke joint ventures, which are mainly large-scale coking enterprises. The coke industry produces a large amount of by-product coke oven gas, which can generate hydrogen gas up to 1×10¹¹m³ of hydrogen gas. The results of the life cycle assessment show that coke oven gas used for chemical conversion and reductant blast furnace blowing can effectively reduce carbon emissions compared with direct power generation as a fuel. Especially the hydrogen production pathway and blast furnace blowing pathway have 5 times and 67 times higher GWP reductions than the methanol production pathway, respectively. In addition, for the various coke oven gas utilization pathways, the total environmental impacts are ranked in descending order as methanol production, power generation, LNG production, ammonia production, hydrogen production, and blast furnace blowing. Based on with the analysis of various coke oven gas utilization paths and the spatial distribution of steel and coke enterprises, Shanxi and other places with more independent coking enterprises can give priority to the transition to the direction of coke oven gas hydrogen production. And in regions with conditions for the development of steel and coke joint, such as Hebei, Liaoning, Jilin, Jiangsu and other places, the transformation to the blast furnace blowing coke oven gas process is more conducive to produce inter-industry synergistic benefits, and effectively promote the development of pollution reduction and carbon reduction.

Key words: coke oven gas, hydrocarbon resources, life cycle analysis, carbon emission reduction potential, coke-steel coupling