A Coal-Water Slurry Combustor for a 5MW Industrial Gas Turbine PUBLIC ACCESS

[+] Author Affiliations
C. Wilkes, C. B. Santanam

General Motors Corporation, Indianapolis, IN

Paper No. 91-GT-206, pp. V003T05A005; 7 pages
  • ASME 1991 International Gas Turbine and Aeroengine Congress and Exposition
  • Volume 3: Coal, Biomass and Alternative Fuels; Combustion and Fuels; Oil and Gas Applications; Cycle Innovations
  • Orlando, Florida, USA, June 3–6, 1991
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7900-9
  • Copyright © 1991 by ASME


This paper summarizes 1/10 scale combustor test results and design parameters that have lead to the fabrication, assembly and test of a full-scale, 22 MW thermal-input (76 mmbtu/hr) combustor and engine system. The engine is a production Allison 501-K industrial turbine that has been modified to accept an external combustor designed for burning coal-water-slurry (CWS) fuel. The combustor utilizes rich-quench-lean (RQL) staging to control emissions of both thermal NOx and NOx formed from nitrogenous compounds contained in the coal-water slurry. Water is injected into the quench zone to freeze molten ash that is formed in the rich zone. The dry ash is removed from the system and collected in storage vessels by passing the hot combustion products through parallel cyclone separators. The cleaned fuel-rich gases pass to the lean zone where the addition of compressor-discharge air results in auto-ignition of the gas mixture and provides sufficient oxygen for completion of the combustion reactions.

Measurements made of emissions from the bench-scale combustor at simulated power conditions show that NOx and CO concentrations of less than 50 ppmvd corrected to 15% oxygen can be expected. Check out testing of the full-scale combustor on CWS and the combined combustor/engine assembly on distillate fuel are now in progress. It is anticipated that engine testing on CWS will commence in early 1991.

Copyright © 1991 by ASME
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