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RESEARCH PAPERS: Gas Turbines: Coal, Biomass, and Alternative Fuels

Air Extraction in a Gas Turbine for Integrated Gasification Combined Cycle (IGCC): Experiments and Analysis

[+] Author and Article Information
J. S. Kapat

Department of Mechanical Engineering, University of South Alabama, Mobile, AL 36688

A. K. Agrawal

School of Aerospace and Mechanical Engineering, University of Oklahoma, Norman, OK 73019

T. Yang

Department of Mechanical Engineering, Clemson University, Clemson, SC 29634

J. Eng. Gas Turbines Power 119(1), 20-26 (Jan 01, 1997) (7 pages) doi:10.1115/1.2815551 History: Received September 01, 1993; Online November 19, 2007

Abstract

This paper presents an investigation of extracting air from the compressor discharge of a heavy-frame gas turbine. The study aimed to verify results of an approximate analysis: whether extracting air from the turbine wrapper would create unacceptable nonuniformity in the flow field inside the compressor discharge casing. A combined experimental and computational approach was undertaken. Cold flow experiments were conducted in an approximately one-third scale model of a heavy-frame gas turbine; a closely approximated three-dimensional computational fluid dynamic analysis was also performed. This study substantiated the earlier prediction that extracting air from the turbine wrapper would be undesirable, although this method of air extraction is simple to retrofit. Prediffuser inlet is suggested as an alternate location for extracting air. The results show that not only was the problem of flow nonuniformity alleviated with this alternate scheme, but the frictional power loss in the compressor discharge casing was also reduced by a factor of two.

Copyright © 1997 by The American Society of Mechanical Engineers
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