RESEARCH PAPERS: Gas Turbines: Electric Utilities

The Cascaded Humidified Advanced Turbine (CHAT)

[+] Author and Article Information
M. Nakhamkin, E. C. Swensen

Energy Storage and Power Consultants, Inc., 200 Central Avenue, Mountainside, NJ 07092

J. M. Wilson, G. Gaul

Westinghouse Electric Corporation, 4400 Alafaya Trail, Orlando, FL 32826

M. Polsky

Polsky Energy Corporation, 650 Dundee Road, Suite 150, Northbrook, IL 60062

J. Eng. Gas Turbines Power 118(3), 565-571 (Jul 01, 1996) (7 pages) doi:10.1115/1.2816685 History: Received May 25, 1995; Online November 19, 2007


This paper introduces the Cascaded Humidified Advanced Turbine (CHAT) plant, a gas turbine based power generation plant utilizing intercooling, reheat, and humidification. It is based upon the integration of an existing heavy duty gas turbine with an additional shaft comprising industrial compressors and high pressure expander. CHAT capitalizes on the latest proven gas turbine technology, which, combined with a sophisticated thermal cycle configuration, results in substantial improvement in gas turbine efficiency, compared to a simple cycle, while still maintaining typical advantages and merits of a combustion turbine plant. Built with a commercial combustion turbine and available industrial compressors and expanders, the CHAT plant does not require extensive product development and testing. As a result, the CHAT power plant can be offered with specific capital costs up to 20 percent lower than the combined cycle plant, and with competing efficiency. Compared to a combined cycle plant, the CHAT plant offers lower emissions (due to air humidification) and other significant operating advantages with regard to start-up time and costs, better efficiency at part load, lower power degradation at higher ambient temperatures, and simpler operations and maintenance due to elimination of the complexities and costs associated with steam production. The CHAT plant also integrates very effectively with coal gasification and particularly well with the water quench design. This feature has been discussed in previous publications.

Copyright © 1996 by The American Society of Mechanical Engineers
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