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Application of Carbon Recycling Iron-making System in a Shaft Furnace

机译：碳循环炼铁系统在竖炉中的应用

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摘要

An active carbon-recycling energy system (ACRES) has been proposed to reduce emission carbon dioxide (CO_2) emission from industrial energy processes. Application of a smart iron-making system based on ACRES (iACRES) in a shaft furnace is modeled numerically as a new low-carbon process. It was assumed that a proportion of the CO_2 in the furnace gas was extracted via gas separation, and reduced into carbon monoxide (CO) by electrolysis, after which regenerated CO was mixed with a reduction gas and recycled continuously in the furnace. The use of a solid oxide electrolysis cell (SOEC) was assumed for the electrolysis process. A one-dimensional model for the shaft furnace was employed for feasibility evaluation of the carbon recycling process. The mixing ratio of electrolysis gas, m [-], was defined as the flow amount of CO_2 separated from the furnace gas for recycling (which was electrolyzed into CO/CO_2 mixture) relative to total inlet reduction gas for the furnace. Electrolysis degree, ed [-], was defined as CO production yield by electrolysis of the separated CO_2. The effects of m and ed on the reduction process in the furnace were evaluated. At ed ＞ 70%, metallization degree of ＞ 90% was maintained at m ＞ 10%. The furnace system was envisaged as a pre-reduction process for iron-ore material. When 70% metallization was acceptable for the pre-reduc-tion process, m of 14% was achievable even at ed of 40%. The value of m is equal to primary fuel saving. It is expected that the shaft furnace with iACRES would have potential as a low-carbon iron-making process.
机译：有人提出了一种活性碳回收能源系统（ACRES），以减少工业能源过程中的二氧化碳排放量。将基于ACRES（iACRES）的智能炼铁系统在竖炉中的应用数值模拟为一种新的低碳工艺。假定通过气体分离将炉气中的一部分CO_2抽出，并通过电解将其还原为一氧化碳（CO），然后将再生的CO与还原气混合并在炉中连续循环。假定在电解过程中使用了固体氧化物电解槽（SOEC）。竖炉的一维模型用于碳回收过程的可行性评估。电解气体的混合比m [-]定义为从用于再循环的炉气（被电解成CO / CO_2混合物）中分离出的CO_2相对于炉内总进口还原气的流量。电解度ed [-]定义为通过电解分离出的CO_2产生的CO产量。评估了m和ed对炉内还原过程的影响。在ed＞ 70％时，金属化度＞ 90％保持在m＞ 10％。熔炉系统被设想为铁矿石材料的预还原工艺。当70％的金属化对于预还原过程是可接受的时，即使在40％的ed下也可以达到14％的m。 m的值等于一次燃料节省。预计配备iACRES的竖炉将具有作为低碳炼铁工艺的潜力。

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  • 来源
    《ISIJ international》 |2015年第2期|359-364|共6页
  • 作者

    Yukitaka KATO; Yutaka UJISAWA; Hiroshi SAKAI; Takanobu INADA;

  • 作者单位

    Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology, 2-12-1-N1-22, Ookayama, Meguro-ku, Tokyo, 152-8550 Japan;

    Ironmaking Technology Div., Nippon Steel and Sumitomo Metal Corporation, 6-1, Marunouchi 2-chome, Chiyoda-ku, Tokyo, 100-8071 Japan;

    Research & Development, Nippon Steel and Sumitomo Metal Corporation, 20-1, Shintomi, Futtsu City, Chiba, 293-8511 Japan;

    Department of Mechanical Engineering, Ishikawa National College of Technology, Kitacyujo, Tsubata, Ishikawa, 929-0392 Japan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    carbon recycling; iACRES; shaft furnace; carbon dioxide; carbon monoxide;

    机译：碳回收;iACRES;竖炉二氧化碳;一氧化碳;

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