Abstract This study addresses the simulation and techno-economic analysis of novel methanol production processes by the combined feeding of hydrogen-rich coke oven gas (COG) and carbon-rich Linz-Donawitz gas (LDG). The optimal operating scheme and conditions to ensure the most favorable carbon and hydrogen balance of the proposed processes, maximized methanol production and polygeneration of methanol, power, and heat, were determined through a rigorous process simulation with a sequential quadratic programming optimization. A techno-economic analysis revealed that two combined-feeding processes show an improved technical and economic performance compared to the conventional methanol production process involving separated feeding of COG and LDG. The primary energy efficiency and minimum methanol selling price of the proposed processes were 51% and 60%, and 265 and 370 USD/ton, respectively, which were greatly improved compared to the base process. In addition, the CO2 emissions of the two processes (0.41 and 1.03 kg of CO2 per kW) imply that adjusting the optimal carbon and hydrogen balance is an important strategy to produce economically viable and environmentally clean methanol from residue gases of the steel industry.

中文翻译：

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焦炉煤气和林茨-多纳维茨煤气生产甲醇的最佳碳氢平衡：工艺开发和技术经济分析

摘要 本研究通过富氢焦炉气 (COG) 和富碳林茨-多纳维茨气 (LDG) 的联合进料，对新型甲醇生产工艺进行了模拟和技术经济分析。通过严格的过程模拟和顺序二次规划优化，确定了最佳操作方案和条件，以确保所提出的过程最有利的碳和氢平衡，最大限度地提高甲醇产量和甲醇、电力和热量的多联产。技术经济分析表明，与涉及 COG 和 LDG 分开进料的传统甲醇生产工艺相比，两种联合进料工艺显示出改进的技术和经济性能。拟议工艺的一次能源效率和最低甲醇销售价格分别为 51% 和 60%，以及 265 和 370 美元/吨，与基础工艺相比有了很大的提高。此外，这两个过程的 CO2 排放量（每千瓦 0.41 和 1.03 千克 CO2）意味着调整最佳碳氢平衡是从钢铁工业的残余气体中生产经济可行且环境清洁的甲醇的重要策略。