Techno-economic evaluation of methanol production using by-product gases from iron and steel works
Techno-economic evaluation of methanol production using by-product gases from iron and steel works
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DOI：
10.1016/j.enconman.2020.112819
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发表时间：
2020-06
影响因子：
10.4
通讯作者：
R. Gao;Chundong Zhang;Geunjae Kwak;Yun-Jo Lee;S. Kang;G. Guan
中科院分区：
文献类型：
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作者：
R. Gao;Chundong Zhang;Geunjae Kwak;Yun-Jo Lee;S. Kang;G. Guan
为了通过有效利用炼钢厂的焦炉煤气（COG）和林茨-多纳维茨转炉煤气（LDG）等副产品气体，在钢铁工业中实现大规模的二氧化碳减排，利用过程模拟器Aspen Plus实现了LDG制甲醇工艺（方案1）和两个LDG/COG制甲醇工艺（方案2和3，分别不进行h2净化或进行h2净化）的概念设计。对所有三种方案进行了工艺开发和经济分析，通过能效和二氧化碳减排率等指标确定技术性能，通过总资本投资和净甲醇生产成本等指标确定盈利能力。同时，针对不同循环比率（0.5 ~ 0.95）下的各方案进行了6个案例研究，探讨了循环比率对技术经济绩效的影响。技术经济分析结果清楚地表明，所有提出的三种方案都能高效地通过使用副产物气体LDG和COG生产甲醇来减少二氧化碳。更具体地说，就能源效率和二氧化碳减减率而言，选项1和3似乎比选项2更节能、更环保。然而，考虑到净甲醇生产成本，方案2和3似乎比方案1在经济上更可行。从技术和经济绩效两方面来看，选择3被认为是最具竞争力的过程。这项工作为钢铁行业提供了候选工艺路线，使其更具可持续性和盈利性，特别是在未来高碳税和低氢价格的情况下。
Aiming at achieving large-scale CO2mitigation in the iron & steel industries via efficient utilization of the by-product gases such as the coke oven gas (COG) and Linz-Donawitz converter gas (LDG) in the iron & steel works, conceptual design of a LDG-to-methanol process (option 1) and two LDG/COG-to-methanol processes (options 2 and 3 without or with H2purification, respectively) was implemented using the process simulator Aspen Plus. Both the process development and economic analysis for all the three proposed options were conducted to determine the technical performance via indicators such as the energy efficiency and CO2reduction rate, and the profitability via indicators such as the total capital investment and the net methanol production cost. Meanwhile, six case studies under different recycle ratios (0.5–0.95) were conducted for each proposed option to investigate the effects of recycle ratio on the technical and economic performance. The techno-economic analysis results clearly show that all the three proposed options are highly efficient for CO2mitigation via methanol production using the by-product gases LDG and COG. More specifically, options 1 and 3 seem to be more energy efficient and eco-friendly than option 2, in terms of energy efficiency and CO2reduction rate. Whereas, options 2 and 3 seem to be more economically feasible than option 1, considering the net methanol production cost. From the aspects of both technical and economic performance, option 3 is considered as the most competitive process. This work provides candidate process routes for the iron & steel industries to become more sustainable and profitable, especially in the event of a high carbon tax and a low H2price in the future.