A Water Quenched Low NOx Coal Slurry Combustor for Industrial Gas Turbines PUBLIC ACCESS

[+] Author Affiliations
C. Wilkes, M. K. Razdan, C. B. Santanam

General Motors Corporation, Indianapolis, IN

Paper No. 89-GT-106, pp. V003T05A001; 9 pages
  • ASME 1989 International Gas Turbine and Aeroengine Congress and Exposition
  • Volume 3: Coal, Biomass and Alternative Fuels; Combustion and Fuels; Oil and Gas Applications
  • Toronto, Ontario, Canada, June 4–8, 1989
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7915-3
  • Copyright © 1989 by ASME


A 1.8 kgs/sec (4 lbs/sec) bench-scale rich-quench-lean combustor has been successfully developed to burn micronized coal-water slurry (CWS) mixtures with 50% solids loading. Water quenching is used to freeze and shatter slag particles leaving the rich zone which are trapped and removed from the hot gas stream in a cyclone separator. Rich zone carbon burnout efficiencies in excess of 99% have been measured experimentally and are in good agreement with two-dimensional (2-D) coal combustion model predictions. Stable operation in the rich zone on 100% CWS at design conditions has been achieved. The low calorific value gas (125 to 445 Kcal/scm, 14 to 50 Btu/scf) produced in the quench zone, auto ignited in the lean zone at all conditions and self-sustained combustion was maintained without the need for auxiliary fuel. Low measured values of carbon monoxide (CO) and oxides of nitrogen (NOx) concentrations in the exhaust gases have demonstrated the ability of the combustor to control emissions to well within acceptable levels.

The bench-scale data provides a technology base for the design of a 15 kgs/sec (33 lbs/sec) combustor that will be used for testing of an advanced coal-fueled gas turbine engine.

Copyright © 1989 by ASME
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