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Investigation of Multi-Functional Energy System (MES) for CO2 Removal

[+] Author Affiliations
Wei Han, Hongguang Jin, Guoqiang Zhang, Hu Lin

Chinese Academy of Sciences, Beijing, China

Paper No. GT2008-50513, pp. 335-345; 11 pages
doi:10.1115/GT2008-50513
From:
  • ASME Turbo Expo 2008: Power for Land, Sea, and Air
  • Volume 1: Aircraft Engine; Ceramics; Coal, Biomass and Alternative Fuels; Manufacturing, Materials and Metallurgy; Microturbines and Small Turbomachinery
  • Berlin, Germany, June 9–13, 2008
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4311-6 | eISBN: 0-7918-3824-2
  • Copyright © 2008 by ASME

abstract

This paper proposes a new approach to mitigate CO2 with low energy penalty through integrating the process of CO2 removal and the processes of synthetical use of different fuels. Then an example system for CO2 removal with synthetic use of coal and natural gas (multi-functional energy system, MES) is discussed to reveal the mechanism of the new approach. The thermodynamic and economic performance of the system is investigated. The natural gas and coal are synthetically used by a novel method named as coal-fired methane/steam reforming (CMR), in which coal combustion will provide thermal energy for methane/steam reforming reaction instead of combustion of natural gas. Some important parameters of reforming temperature, steam-to-methane ratio and hydrogen separation ratio are selected to clarify their impacts on the system thermodynamic performances. Comparing with the single systems including hydrogen plant based on natural gas with CO2 removal (NHPR) and coal-fired steam cycle with CO2 removal (CSCR), the MES can generate about 22% more hydrogen or about 70% more power with the same fossil fuel consumption and the same amount of CO2 removal. The economic performances of the MES system and the single systems are also investigated and compared. As a result, the cost of the avoided CO2 emission of the MES is only 17.5 $/tonneCO2, which is about 60% lower than that of the single systems. The results obtained here provide a feasible approach for CO2 removal efficiently and economically.

Copyright © 2008 by ASME

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