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A Novel Multi-Functional Energy System (MES) for CO2 Removal With Zero Energy Penalty

[+] Author Affiliations
Hongguang Jin, Wei Han, Lin Gao

Chinese Academy of Sciences, Beijing, China

Paper No. GT2007-27680, pp. 407-416; 10 pages
doi:10.1115/GT2007-27680
From:
  • ASME Turbo Expo 2007: Power for Land, Sea, and Air
  • Volume 1: Turbo Expo 2007
  • Montreal, Canada, May 14–17, 2007
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 0-7918-4790-X | eISBN: 0-7918-3796-3
  • Copyright © 2007 by ASME

abstract

In this paper, a novel multi-functional energy system (MES) is proposed, in which hydrogen and electricity are co-generated and about 90% of CO2 is removed. By integrating the methane/steam reforming reaction and combustion of coal, the natural gas and coal are utilized synthetically, in which coal is burned to provide high-temperature thermal energy to the methane/steam reforming reaction. After that, the resulting syngas enters a PSA unit to separate about 70% of hydrogen and the concentration of carbon dioxide is increased significantly from nearly 20% to 43% in the PSA tail gas. As a result, the overall efficiency of the new system is 63.2%. Compared to a conventional NG based hydrogen plant and a coal firing steam power plant without CO2 removal (the overall efficiency of the two system is 63.0%), the energy penalty for CO2 removal in the new system is nearly totally avoided. Based on the graphical exergy analysis, we disclose that the integration of synthetic utilization of fossil fuel (natural gas and coal) and CO2 removal process plays a significant role in zero energy penalty for CO2 removal and its liquefaction in the MES system. The result obtained here provides a new approach for CO2 removal with zero or low thermal efficiency reduction (energy penalty) in an energy system.

Copyright © 2007 by ASME
Topics: Carbon dioxide

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