In a current research and development program a coal-fired atmospheric fluidized bed combustor is being designed to supply the heat to a closed cycle gas turbine cogeneration system. The major technical effort is directed towards the design of the in-bed heat exchanger, which is required to operate near bed temperature. This high temperature (850° C) exposes the heat exchanger tubes to potentially severe sulfidation. The corrosion behavior depends upon the intimate details of the bed environment and may be related to the occurrence of localized areas of low oxygen partial pressure and high sulfur partial pressure. This paper describes a series of measurements of oxygen partial pressure at various locations within a fluidized bed. The bed, containing densely packed heat exchanger tubes, was operated under various conditions to observe the effect of coal mixing and devolatilization on local oxygen activity. Substantial variations of oxygen partial pressure (below 10−14 atmospheres) were observed. It was noted that these locally severe variations could be substantially modified by changes in coal mixing (as through coal port design). The experiments with varying coal size suggest that rapid devolatilization is desirable and would reduce the extent of locally corrosive environments.
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July 1983
This article was originally published in
Journal of Engineering for Power
Research Papers
The Gas Turbine Heat Exchanger in the Fluidized Bed Combustor
C. F. Holt,
C. F. Holt
Battelle-Columbus Laboratories, Columbus, Ohio 43201
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A. A. Boiarski,
A. A. Boiarski
Battelle-Columbus Laboratories, Columbus, Ohio 43201
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H. E. Carlton
H. E. Carlton
Battelle-Columbus Laboratories, Columbus, Ohio 43201
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C. F. Holt
Battelle-Columbus Laboratories, Columbus, Ohio 43201
A. A. Boiarski
Battelle-Columbus Laboratories, Columbus, Ohio 43201
H. E. Carlton
Battelle-Columbus Laboratories, Columbus, Ohio 43201
J. Eng. Power. Jul 1983, 105(3): 438-445 (8 pages)
Published Online: July 1, 1983
Article history
Received:
December 15, 1981
Online:
September 28, 2009
Citation
Holt, C. F., Boiarski, A. A., and Carlton, H. E. (July 1, 1983). "The Gas Turbine Heat Exchanger in the Fluidized Bed Combustor." ASME. J. Eng. Power. July 1983; 105(3): 438–445. https://doi.org/10.1115/1.3227434
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