RESEARCH PAPERS: Gas Turbines: Combustion and Fuels

A Coal-Fueled Combustion Turbine Cogeneration System With Topping Combustion

[+] Author and Article Information
J. M. Beér

Massachusetts Institute of Technology, Cambridge, MA 02139

R. V. Garland

Westinghouse Electric Corporation, Orlando, FL

J. Eng. Gas Turbines Power 119(1), 84-92 (Jan 01, 1997) (9 pages) doi:10.1115/1.2815567 History: Received January 01, 1994; Online November 19, 2007


Cogeneration systems fired with coal or other solid fuels and containing conventional extracting-condensing or back pressure steam turbines can be found throughout the world. A potentially more economical plant of higher output per unit thermal energy is presented that employs a pressurized fluidized bed (PFB) and coal carbonizer. The carbonizer produces a char that is fed to the PFB and a low heating value fuel gas that is utilized in a topping combustion system. The topping combustor provides the means for achieving state-of-the-art turbine inlet temperatures and is the main contributor to enhancing the plant performance. An alternative to this fully coal-fired system is the partially coal, partially natural gas-fired air heater topping combustion cycle. In this cycle compressed air is preheated in an atmospheric pressure coal-fired boiler and its temperature raised further by burning natural gas in a topping gas turbine combustor. The coal fired boiler also generates steam for use in a cogeneration combined cycle. The conceptual design of the combustion turbine is presented with special emphasis on the low-emissions multiannular swirl burner topping combustion system and its special requirements and features.

Copyright © 1997 by The American Society of Mechanical Engineers
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