Simulation of integrated novel PSA/EHP/C process for high-pressure hydrogen recovery from Coke Oven Gas |
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| Affiliation: | 1. Sustainable Environment Research Centre (SERC), Faculty of Computing, Engineering and Science, University of South Wales, CF37 1DL, United Kingdom;2. Tata Steel Strip Products, Neath Port Talbot, Port Talbot, SA13 2NG, United Kingdom;3. HyET Hydrogen B.V., Westervoortsedijk 71 K, 6827 AV Arnhem, the Netherlands;1. Hubei Key Laboratory of Advanced Technology for Automotive Components and Hubei Collaborative Innovation Center for Automotive Components Technology, School of Automotive Engineering, Wuhan University of Technology, Hubei 430070, China;2. School of Automotive Engineering, Wuhan Technical College of Communications, Hubei 430065, China;3. Hydrogen Research Institute, Université du Québec à Trois-Rivières, QC G9A 5H7, Canada;4. School of Mathematics and Computer Science, Jianghan University, Hubei 430056, China;1. Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Energy and Power Engineering, Tsinghua University, Beijing, 100084, China;2. Shanxi Research Institute for Clean Energy, Tsinghua University, Taiyuan, Shanxi Province, 030032, China;3. International Joint Laboratory on Low Carbon Clean Energy Innovation, Tsinghua University, Beijing, China;1. School of Mathematics and Computer Science, Jianghan University, Hubei 430056, China;2. School of Automotive Engineering, Wuhan Technical College of Communications, Hubei 430065, China;3. Hubei Key Laboratory of Advanced Technology for Automotive Components and Hubei Collaborative Innovation Center for Automotive Components Technology, School of Automotive Engineering, Wuhan University of Technology, Hubei 430070, China;4. Hydrogen Research Institute, Université du Québec à Trois-Rivières, QC G9A 5H7, Canada |
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| Abstract: | This paper introduces a novel Coke Oven Gas (COG) hydrogen purification/compression system based on the technologies of Pressure Swing Adsorption (PSA) and Electrochemical Hydrogen Purification and Compression (EHP/C). As the EHP/C tolerates O2, N2 and CH4 impurities, PSA can be utilized solely for CO and CO2 removal (other COG impurities were not considered in this work). A relaxation of PSA hydrogen purity could significantly enhance its recovery rate. In this study, the suitability of traditional hydrogen PSA as part of the hybrid PSA/EHP/C approach was investigated. Aspen Adsorption and Matlab were used to model the PSA and EHP/C systems, respectively. The effect of adsorption pressure, purge-to-feed-ratio (P/F-ratio) and adsorption time within cycle on PSA performance is reported. This study found that breakthrough of non-detrimental components is typically accompanied with poisonous CO. Hence, the CO removal with traditional H2-PSA resulted into high purity product. In a two-bed PSA, 36.3% of hydrogen was recovered at 99.9988% purity and 0.18 ppm CO. Subsequently, as a result, the EHP/C purification capability was merely utilized, but polished this hydrogen to >99.999% purity. Simultaneously, hydrogen was isothermally compressed to 20 MPa, consuming a marginal 2.42 kWh/kg. Compared to mechanical compression, this is 31.6% more energy efficient. Recovering hydrogen from by-product COG was found to save 0.5 kg CO2/kg H2 compared to hydrogen produced from natural gas. Conventional hydrogen PSA, utilizing 70% Activated Carbon and 30% Molecular Sieve 5A, was found not to be effective to target the removal of CO specifically. To increase synergy between PSA and EHP/C, the PSA requires adequate design and operation using appropriate adsorbents and cycle steps to target elimination of CO. An increased EHP/C catalyst tolerance for CO also contributes to higher flexibility. |
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| Keywords: | Hydrogen PSA impurity breakthrough Aspen adsorption Matlab Electrochemical hydrogen purification and compression Reduced industrial carbon footprint Steelworks arising by-product hydrogen |
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