当前位置:
X-MOL 学术
›
Energy Environ. Sci.
›
论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Minimizing CO2 emissions with renewable energy: a comparative study of emerging technologies in the steel industry
Energy & Environmental Science ( IF 32.5 ) Pub Date : 2020-05-26 , DOI: 10.1039/d0ee00787k Marian Flores-Granobles 1, 2, 3, 4 , Mark Saeys 1, 2, 3, 4
Energy & Environmental Science ( IF 32.5 ) Pub Date : 2020-05-26 , DOI: 10.1039/d0ee00787k Marian Flores-Granobles 1, 2, 3, 4 , Mark Saeys 1, 2, 3, 4
Affiliation
CO2 emissions from the steel industry are amongst the most difficult to abate, since carbon is used as a stoichiometric reducing agent in most steel mills. This carbon ends up as a CO/CO2 mixture in the steel mill gases, which are combusted to generate heat, electricity, and more CO2. Strategies to capture and store (CCS), utilize (CCU) or avoid CO2 in steel production exist, but are highly dependent on the availability of renewable electricity for the production of low-carbon H2. Steel mill gas contains energy, and can thus be re-used more easily than combustion gas or process gas from the cement industry. In this study, we evaluate several strategies to reduce CO2 emissions in the steel industry and rank them according to their renewable electricity requirement. We propose the following steps: (1) shut down the steel plant's power plant, since it produces electricity with a carbon intensity that is even higher than coal-based power plants; (2) replace steel mill gas with natural gas to generate heat within the steel mill; (3) recover the reducing gases, H2 and CO, from the steel mill gases: e.g., using pressure swing adsorption to obtain a H2-rich stream from COG, and sorption-enhanced water gas shift to obtain a H2-rich stream and a pure CO2 stream from BFG and BOFG; (4) the recovered H2 converts some of the CO2 to methanol, excess CO2 is stored. The proposed CCUS scenario can retrofit existing infrastructure, uses proven technology and reduces CO2 emissions by 70% for a marginal renewable electricity demand. Other energy-intensive alternatives have the potential to reduce CO2 emissions by 85%, but require an order-of-magnitude more renewable electricity.
中文翻译:
使用可再生能源将二氧化碳排放量降至最低:钢铁行业新兴技术的比较研究
钢铁行业的CO 2排放是最难消除的,因为在大多数钢厂中,碳被用作化学计量的还原剂。此碳最终为一个CO / CO 2混合物在钢厂气体,这是燃烧以产生热,电,和更多的CO 2。存在在钢铁生产中采用捕获和存储(CCS),利用(CCU)或避免CO 2的策略,但是这些策略高度依赖于可再生电力的可用性以生产低碳H 2。炼钢厂的气体包含能量,因此比水泥行业的燃烧气体或工艺气体更容易重复利用。在这项研究中,我们评估了几种减少CO 2的策略钢铁行业的排放,并根据其可再生电力需求对其进行排名。我们建议采取以下步骤:(1)关闭钢厂的发电厂,因为它产生的碳强度甚至比煤电厂高。(2)用天然气代替钢厂煤气在钢厂内产生热量;(3)从炼钢厂气体中回收还原性气体H 2和CO:例如,利用变压吸附从COG中获得富H 2物流,并通过吸附增强的水煤气变换获得富H 2来自BFG和BOFG的物流和纯CO 2物流;(4)回收的H 2转化了一些CO 2甲醇中储存了过量的CO 2。提出的CCUS方案可以改造现有基础设施,使用经过验证的技术,并为边际可再生电力需求减少70%的CO 2排放。其他耗能大的替代品有可能将CO 2排放量减少85%,但需要更多数量级的可再生电力。
更新日期:2020-07-15
中文翻译:
使用可再生能源将二氧化碳排放量降至最低:钢铁行业新兴技术的比较研究
钢铁行业的CO 2排放是最难消除的,因为在大多数钢厂中,碳被用作化学计量的还原剂。此碳最终为一个CO / CO 2混合物在钢厂气体,这是燃烧以产生热,电,和更多的CO 2。存在在钢铁生产中采用捕获和存储(CCS),利用(CCU)或避免CO 2的策略,但是这些策略高度依赖于可再生电力的可用性以生产低碳H 2。炼钢厂的气体包含能量,因此比水泥行业的燃烧气体或工艺气体更容易重复利用。在这项研究中,我们评估了几种减少CO 2的策略钢铁行业的排放,并根据其可再生电力需求对其进行排名。我们建议采取以下步骤:(1)关闭钢厂的发电厂,因为它产生的碳强度甚至比煤电厂高。(2)用天然气代替钢厂煤气在钢厂内产生热量;(3)从炼钢厂气体中回收还原性气体H 2和CO:例如,利用变压吸附从COG中获得富H 2物流,并通过吸附增强的水煤气变换获得富H 2来自BFG和BOFG的物流和纯CO 2物流;(4)回收的H 2转化了一些CO 2甲醇中储存了过量的CO 2。提出的CCUS方案可以改造现有基础设施,使用经过验证的技术,并为边际可再生电力需求减少70%的CO 2排放。其他耗能大的替代品有可能将CO 2排放量减少85%,但需要更多数量级的可再生电力。