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    碳中和背景下钢厂煤气资源化发展分析与前景

    Analyses and Prospects of Steel Mill Gas Resource Utilization and Development Under Carbon Neutrality Background

    • 摘要: 我国是世界上最大的钢铁和化学产品生产国,其生产原料高度依赖煤炭资源。受能源资源禀赋的影响,我国钢铁行业短期内难以大规模推广电弧炉生产技术。目前,传统的高炉-转炉工艺仍占主导地位,该工艺具有能源结构高碳化、粗钢产量大、碳排放机理复杂等特点,并伴生以碳、氢为主要成分的钢厂煤气,包括焦炉煤气、高炉煤气和转炉煤气。然而,目前钢厂煤气主要作为燃料使用,能量转换效率较低,未能充分挖掘其潜在价值。实际上,钢厂煤气中的H2、CO、CO2、CH4等成分是化工行业生产的主要载碳、载氢原料。通过有效回收和利用富余钢厂煤气生产化工产品,能够实现钢铁与化工行业协同降耗,推动低碳减排和绿色发展。基于我国能源结构的实际情况,结合钢铁和化工行业的发展现状,探讨了钢厂煤气的产生与利用情况,综述了国内外相关案例,分析了钢厂煤气合成化工产品的现状与发展潜力,并提出了加快钢化联产发展的建议。从长远来看,我国钢铁行业要实现“双碳”目标,必须依托氢冶金、碳捕集、利用与封存(CCUS)等先进技术,同时需要制度变革和政策的支持。实现我国“双碳”目标不仅需要技术创新,还需要加强跨界思维与跨行业协作,以推动钢铁和化工行业的绿色转型和可持续发展。

       

      Abstract: China is the world′s largest producer of steel and chemicals, the production of which heavily relies on coal resources. Although China′s steel industry has made considerable progress in reducing energy consumption, the total annual energy consumption continues to rise due to the industrial scale and increased production capacities. The "Carbon Peak and Carbon Neutrality" initiative has accelerated China′s energy revolution, driving the development of emerging energy sources and the construction of a modern energy system. Due to limitations in energy resources, it is difficult for China′s steel industry to adopt electric arc furnaces (EAFs) on a large scale in the short term. The traditional blast furnace/basic oxygen furnace (BF-BOF) integrated steelmaking route is characterized by a high-carbon energy structure, a significant crude steel output, and complex carbon emission mechanisms. This process also produces steel mill gases, primarily composed of coke oven gas (COG), blast furnace gas (BFG), and Linz-Donawitz gas (LDG). Currently, steel mill gases are primarily used as fuels, a practice with relatively low energy conversion efficiency. However, the hydrogen, carbon monoxide, carbon dioxide, and methane within these gases represent valuable sources for chemical production. Through continuous technological advancements in recovering surplus steel mill gases for use in chemical manufacturing, the steel and chemical industries can collaborate to achieve energy conservation, emission reduction, and sustainable development. This study examines the generation and utilization of gases across various steel production processes in the context of China′s energy structure and the development status of its steel and chemical industries. It also reviews domestic and international cases of integrated steel-chemical production and gas resource utilization, analyzes the current state and potential for synthesizing chemical products from steel mill gases, and proposes strategies to accelerate the adoption of new steel-chemical integration technologies. The ultimate goal is to establish a novel, sustainable industrial ecosystem, with the steel industry as the foundation, in synergy with the chemical industry. Achieving the long-term goal of "Carbon Peak and Carbon Neutrality" in China′s steel industry will depend on advancing hydrogen metallurgy, carbon capture, utilization, and storage (CCUS) technologies, along with institutional reforms and policy support. In addition, the application and development of life cycle assessment (LCA) research can track the carbon footprint of the steel industry in more detail and systematically analyze its energy consumption and environmental impact. However, systematic LCA analyses of China′s steel industry are still limited. Overall, realizing China′s carbon neutrality objectives will require broader cross-disciplinary approaches and innovative strategies.

       

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