A novel coke-oven gas-to-natural gas and hydrogen process by integrating chemical looping hydrogen with methanation. (15th December 2018)

• Record Type: Journal Article
• Authors: Xiang, Dong; Huang, Weiqing; Huang, Peng
• Is Part Of: Energy. Volume 165(2018)Part B
• Page Start: 1024
• Page End: 1033
• Publication Date: 2018-12-15
• Subjects: Coke-oven gas-to-natural gas -- CO2 capture and utilization -- Optimization -- Thermodynamic analysis; Power resources -- Periodicals; Power (Mechanics) -- Periodicals; Energy consumption -- Periodicals; 333.7905
• DOI: 10.1016/j.energy.2018.10.050
• Languages: English
• ISSNs: 0360-5442

Abstract

Abstract: The coke-oven gas (COG)-to-natural gas (CGtNG) is a promising process of chemical industry. However, the CGtNG suffers from low hydrogen utilization efficiency and natural gas capacity due to the high ratio of hydrogen to carbon of the COG. The CO2 derived from chemical looping hydrogen process can be an effective carbon source to optimize syngas composition for high efficient natural gas production. Therefore, a novel process of COG chemical looping hydrogen assisted COG-to-natural gas (CGCLH -CGtNG) is proposed in this paper. The key parameters are optimized for maximizing COG utilization and natural gas production in the novel process. Results show that the novel process could solve the issues of CO2 utilization in the chemical looping hydrogen process and low natural gas production in the CGtNG. At the cost of additional 4.36 t/h COG consumption, the novel process produce about 19% more natural gas and additional 1.39 t/h hydrogen compared with the conventional CGtNG process. The corresponding hydrogen utilization and exergy efficiencies of the novel process are increased from 61.1% to 78.5% in the CGtNG to 82.4% and 87.6% through intensive mass and energy integration, respectively. Highlights: Coke-oven gas chemical looping hydrogen assisted methanazation process was proposed. The new process generated CH4 and H2 with exergy saving by 9.1% points. The new process improved H2 utilization efficiency by 35% and CH4 production by 19%.