Thermal efficiency evaluation of open-loop SI thermochemical cycle for the production of hydrogen, sulfuric acid and electric power

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• 作者：Junhu Zhou ; Yanwei Zhang ; Zhihua Wang ; Weijuan Yang ; Zhijun Zhou ; Jianzhong Liu ; Kefa Cen
• 关键词：Thermal efficiency ; Open-loop ; SI thermochemical cycle ; Hydrogen production
• 刊名：International Journal of Hydrogen Energy
• 出版年：2007
• 期刊代码：42_03603199
• 类别：ch
• 出版时间：April 2007
• 卷：32
• 期：5
• 页码：567-575
• 文件大小：260 K

摘要

Total thermal efficiency of a new open-loop SI thermochemical cycle for the production of hydrogen, sulfuric acid and electric power was investigated. The new system without CO₂ emission is composed of sulfuric acid industry process which provides the chemical reactant SO₂ and heat, electric energy demands of the system and SI open-loop cycle separated into the Bunsen reaction system, the HI_x system and the H₂SO₄ concentration system. The selection of SI cycle to run in an open-loop fashion for China is tied-up with two important facts: (1) sulfur iron ore as SO₂ source is inexpensive and abundantly available; (2) the product sulfuric acid, in addition to hydrogen, is valuable and marketable. The mass and heat balance of the process were calculated with the optimized conditions. Thermal efficiency for hydrogen production was 66.3%with ideal operating conditions of the EED cell and heat exchangers in the case of generating electric power without waste heat and was 70.9%in the case of high performance waste heat recovery.