Abstract Coke-oven gas and Linz Donawitz gas are pollutive by-product gases generated from steel plants. The gases are currently combusted or released to atmosphere, but those can be economically utilized as chemical product. Thus, this study proposes improved methanol production process from the gases, by considering two different strategies: efficiency (Case 1) and productivity (Case 2). Both processes are rigorously integrated using Aspen Plus V10 and evaluated from the perspectives of productivity, thermodynamic efficiency, environmental impact, and techno-economics. Compared to Case 1, Case 2 had 2.1 times the productivity but required 3 times natural gas. As a result, Case 1 showed better efficiencies of 58–68% (46–56% in Case 2), reduced larger carbon emission of 425 kmol/h (123 kmol/h in Case 2), and had lower minimum selling price of 371 $/tonne (398 $/tonne in Case 2). Two proposed processes are also economically superior than similar previous processes (550–712 $/tonne). This study confirms that both presented novel processes are sustainable and economically viable, and also improves the understanding of methanol production from the waste gases of steel production.

中文翻译：

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焦炉气与林茨多纳维茨气混合制甲醇的开发及技术经济研究

摘要 焦炉煤气和林茨多纳维茨煤气是钢铁厂产生的污染性副产品气体。这些气体目前被燃烧或释放到大气中，但这些气体可以作为化学产品经济地利用。因此，本研究通过考虑两种不同的策略：效率（案例 1）和生产率（案例 2），提出了改进的气体甲醇生产工艺。这两个过程都使用 Aspen Plus V10 进行了严格集成，并从生产力、热力学效率、环境影响和技术经济的角度进行了评估。与案例 1 相比，案例 2 的生产率是 2.1 倍，但需要 3 倍的天然气。结果，案例 1 表现出更好的 58-68%（案例 2 中的 46-56%）的效率，减少了 425 kmol/h（案例 2 中的 123 kmol/h）的更大的碳排放，最低售价为 371 美元/吨（案例 2 中为 398 美元/吨）。两种提议的工艺在经济上也优于类似的先前工艺（550-712 美元/吨）。该研究证实，所提出的两种新工艺都是可持续且经济可行的，并且还提高了对从钢铁生产废气中生产甲醇的理解。