氢气气基竖炉-电炉短流程环境影响分析

氢冶金是中国钢铁行业实现低碳绿色化转型升级的有效途径之一,基于煤制氢技术的气基竖炉-电炉短流程是一种典型的氢冶金工艺,具有广阔的发展前景。采用生命周期评价法(LCA)对煤制氢-气基竖炉-电炉短流程环境影响进行了分析,并对比研究了短流程与传统高炉-转炉(BF-BOF)长流程的环境性能。结果表明,煤制氢-气基竖炉-电炉短流程LCA结果为2.56×10-11,其中GWP₁₀₀(全球变暖潜值)和POCP(光化学臭氧合成潜值)分别贡献54.16%和36.76%;煤气脱碳和电炉电能消耗是造成碳排放和能源消耗的主要原因;短流程整体评价结果仅为BF-BOF流程的27.41%,吨钢CO₂排放和能耗可分别减少53.75%和47.45%,环境性能明显优于传统长流程。

Environmental impact analysis of hydrogen shaft furnace-electric furnace process

Hydrogen metallurgy is one of the effective ways to realize low-carbon and green upgrading of China's iron and steel industry. The hydrogen shaft furnace-electric furnace process based on coal gasification technology is a typical hydrogen metallurgy process which is considered to have broad prospects. The environmental performance of hydrogen shaft furnace-electric furnace (HSE) process was evaluated through life cycle assessments (LCA), and a comparison analysis of environmental impact between HSE process and blast furnace-basic oxygen furnace (BF-BOF) process was also conducted. The results showed that: firstly, the LCA calculated results of HSE process was 2.56×10-11, and GWP₁₀₀ and POCP contributed 54.16% and 36.76% of total environmental impact, respectively; secondly, decarburization of the syngas and electric furnace production were the key factors leading to massive CO₂ emission and energy consumption; thirdly, the total environmental impact of HSE process was 27.41% of BF-BOF process, and the energy consumption and CO₂ emission could be reduced by 53.75% and 47.45%, indicating an obvious environmental advantage.