Simulation of 12-bed vacuum pressure-swing adsorption for hydrogen separation from methanol-steam reforming off-gas |
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| Affiliation: | 1. Center for Clean Energy Engineering, University of Connecticut, Storrs, CT 06269-5233, United States;2. Department of Mechanical Engineering, University of Connecticut, Storrs 191 Auditorium Road, Unit 3139, Storrs, CT 06269-4602, United States;3. Department of Chemical & Biomolecular Engineering, University of Connecticut, Storrs 191 Auditorium Road, Unit 3222, Storrs, CT 06269, United States |
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| Abstract: | This study focuses on analysis of a 12-bed vacuum pressure-swing adsorption (VPSA) process capable of purifying hydrogen from a ternary mixture (H2/CO2/CO 75/24/1 mol%) derived from methanol-steam reforming. The process produces 9 kmol H2/h with less than 2 ppm and 0.2 ppm of CO2 and CO, respectively, to supply a polymer electrolyte membrane fuel cell. The process model is developed in Aspen Adsorption® using the “uni-bed” approach. A parametric study of H2 purity and recovery with respect to adsorption pressure, adsorbent height, activated carbon:zeolite ratio, feed composition, and number of beds is performed. Results show 12-bed VPSA can meet the H2 purity goals, with H2 recovery as high as 75.75%. Adsorption occurs at 7 bar, the column height is 1.2 m, and the adsorbent ratio is 70%:30%. A 4-bed VPSA can achieve the same purity goals as the 12-bed process, but H2 recovery decreases to 61.34%. |
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| Keywords: | Vacuum pressure-swing adsorption Hydrogen purification Process simulation Methanol-steam reforming Polymer electrolyte membrane fuel cell Aspen Adsorption® |
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