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Energy Flow of Advanced IGCC With CO2 Capture Option

[+] Author Affiliations
Masako Kawabata, Norihiko Iki, Osamu Kurata, Hirohide Furutani

National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki, Japan

Atsushi Tsutsumi

University of Tokyo, Tokyo, Japan

Eiichi Koda

Central Research Institute of Electric Power Industry (CRIEPI), Yokosuka, Kanagawa, Japan

Toshiyuki Suda, Yoshiaki Matsuzawa

IHI Corporation, Yokohama, Kanagawa, Japan

Paper No. IMECE2010-40456, pp. 551-558; 8 pages
doi:10.1115/IMECE2010-40456
From:
  • ASME 2010 International Mechanical Engineering Congress and Exposition
  • Volume 5: Energy Systems Analysis, Thermodynamics and Sustainability; NanoEngineering for Energy; Engineering to Address Climate Change, Parts A and B
  • Vancouver, British Columbia, Canada, November 12–18, 2010
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4429-8
  • Copyright © 2010 by ASME

abstract

Conventional IGCC (integrated gasification combined cycle) employs a cascaded energy flow with a high efficiency, yet it is difficult to achieve over 50% HHV (higher heating value). The current study proposes an alternative model of exergy recuperated Advanced IGCC (A-IGCC) to achieve higher plant efficiency by applying an autothermal reaction in the gasifier. This requires an additional heat supply from the gas turbine exhaust and the steam extracted from the steam turbine. System and performance analyses were studied on base IGCC and A-IGCC cases incorporating the heat (exergy) recuperation concept with an air-blown twin circulating fluidized bed gasifier for the gasification of sub-bituminous coal, both with and without the post combustion carbon dioxide (CO2 ) capture option. A-IGCC could deliver sufficient energy in the gasifier to the gas turbine without losing heat as resulted in IGCC. Chemical absorption methods using monoethanolamine (MEA) and methyldiethanolamine (MDEA) were selected as a CO2 absorbent. A-IGCC demonstrated a significantly higher system efficiency (51%) than IGCC (43%) without CO2 separation, provided the gas purification was at high temperature. The thermal efficiency penalty by CO2 capture was −8% using MDEA (56% absorption) and −11% using MEA (90% absorption).

Copyright © 2010 by ASME

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