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Thermochemical analysis of ACFB-based gas and power cogeneration

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  • Makarytchev, S.V.
  • Fang, M.X.
  • Li, X.T.
  • Luo, Z.Y.
  • Cen, K.F.

Abstract

A first- and second-law analysis is presented for a process developed for simultaneous generation of a fuel gas and electric power (gas and power cogeneration) based on atmospheric circulating-fluidized-bed (ACFB) combustion of coal. The mathematical model has a zone structure, multi-species equilibrium calculations for applicable zone conditions at high temperatures (50 gas-phase and seven solid-phase chemical species) and the concept of freezing of the gas composition at low temperatures. Our analysis shows that the process utilizes coal in a simple, effective and environmentally clean manner. The first- and second-law efficiencies of the process are, respectively, 35.0 and 27.6% for gas generation, 15.4 and 14.6% for power generation, 50.4 and 42.2% overall. The heating value of the gas is 11 MJ/Nm3 (medium). Desulphurization is achieved by using CaS-based sulphur capture during limestone addition to the gasifier bed. Results are compared with data from a 150 kg of coal/h experimental plant.

Suggested Citation

  • Makarytchev, S.V. & Fang, M.X. & Li, X.T. & Luo, Z.Y. & Cen, K.F., 1995. "Thermochemical analysis of ACFB-based gas and power cogeneration," Energy, Elsevier, vol. 20(12), pages 1271-1283.
    • Handle: RePEc:eee:energy:v:20:y:1995:i:12:p:1271-1283
    DOI: 10.1016/0360-5442(95)00063-M
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    Cited by:

    1. Gungor, Afsin, 2009. "Second law analysis of heat transfer surfaces in circulating fluidized beds," Applied Energy, Elsevier, vol. 86(7-8), pages 1344-1353, July.

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