双碳背景下中国钢铁行业未来发展趋势探讨

Discussion on the future development trend of China’s iron and steel industry under the background of double carbon

  • 摘要: 钢铁行业是绿色低碳发展的重要领域,从战略层面上探讨钢铁行业的低碳转型路径具有重要意义. 本文构建了钢铁行业粗钢产量、废钢资源产出量、碳排放量、铁素资源结构、生产流程结构、能源消费结构等预测模型,分设三类情景对钢铁行业低碳转型路径从战略层面上进行了深入探讨. 研究结果表明,随着产业结构的调整优化,未来我国钢铁行业将呈现减量化发展态势,粗钢产出总量将逐年降低,2060年有望降低至6~7亿吨;随着社会钢铁蓄积量的不断增加,废钢资源产出量将快速增长,预计于2045年前后达到峰值,约5~6亿吨;随着各类降碳措施的合理应用,行业CO2排放量将逐年下降,预计2060年行业剩余CO2排放量约0.9~1.98亿吨,此时借助碳捕集封存与利用技术(CCUS)、碳汇等技术手段可实现“碳中和”目标. 三种情景下,钢铁行业的降碳趋势大致相同,仅减碳量略有差异,其中低产量情景更符合“双碳”目标. 在低产量情景下,中国钢铁行业的低碳发展历程大致可分为:初步脱碳、强化脱碳、深度脱碳、近零碳排4个阶段;在各降碳措施中,控制粗钢产量是最行之有效的降碳措施,降碳潜力最大,约占总减碳量的40%,其次是废钢资源利用,降碳潜力约27%,流程结构优化和低碳技术应用的降碳潜力占比分别为16%和15%,也具备一定的降碳潜力,不容忽视. 未来在我国钢铁行业“双碳”进程中,行业铁素资源结构、生产流程结构和能源消费结构将得以调整优化,预计2060年我国铁矿资源消耗将在2023年基础上降低65%~77%,废钢资源消耗将增长近1倍;高炉—转炉长流程占比将调整至15%~30%,全废钢电炉短流程占比提升至40%~50%,氢还原—电炉流程占比提升至28%~34%;煤炭资源消耗降低76%~89%,电力资源消耗维持在31004800亿千瓦时,氢气资源消耗约1000万吨.

     

    Abstract: The iron and steel industry is critical to the pursuit of green and low-carbon development. It is strategically important to explore pathways for the industry’s low-carbon transformation. This study constructs a forecast model for various parameters such as crude steel output, scrap steel resource output, carbon emissions, ferrous resource structure, production process structure, and energy consumption structure in the steel industry. It sets up three scenarios to explore the low-carbon transformation path of the steel industry from a strategic perspective. The research results indicate that with adjustments and optimization of the industrial structure, China’s steel industry will trend toward reduced development in the future, with the total output of crude steel expected to decrease annually. By 2060, crude steel production is projected to fall to 600–700 million tons. With the continuous increase in social steel accumulation, the output of scrap steel resources will grow rapidly and is expected to reach a peak around 2045 at approximately 500–600 million tons. With the rational implementation of various carbon reduction measures, the industry’s CO2 emissions are expected to decline steadily each year. By 2060, the steel industry is estimated to still emit 90–198 million tons of CO2. At this stage, achieving “carbon neutrality” will necessitate technologies such as carbon capture, utilization, and storage (CCUS) and carbon sinks. Despite slight differences in carbon reduction amounts among the three scenarios, the overall carbon reduction trends remain similar. The low-output scenario aligns best with the “dual carbon” goals. Under the low-production scenario, the steel industry’s low-carbon development process can be roughly divided into four stages: initial decarbonization, intensified decarbonization, deep decarbonization, and near-zero carbon emission. Among various carbon reduction measures, controlling crude steel production emerges as the most effective carbon reduction measure, contributing approximately 40% of the total carbon reduction potential. The second most effective measure is the utilization of scrap steel resources, with a potential for carbon reduction of about 27%. In addition, process structure optimization and low-carbon technology applications account for 16% and 15%, respectively, indicating their significant roles in carbon reduction. In the future, as China pursues its "dual carbon" goals in the steel industry, the industry's iron resource structure, production processes, and energy consumption structure will be adjusted and optimized. By 2060, China’s iron ore resource consumption will be reduced by 65%–77% compared to 2023 levels, while scrap steel resource consumption will nearly double. The proportion of the blast furnace-converter process will adjust to 15%–30%, the full-scrap electric furnace process will increase to 40%–50%, and the hydrogen reduction–electric furnace process will rise to 28%–34%. Furthermore, coal resource consumption will decrease by 76%–89%, electricity resource consumption will stabilize at 310–480 billion kWh, and hydrogen resource consumption will reach 10 million tons.

     

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