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RESEARCH PAPERS: Gas Turbines: Combustion and Fuels

Reaction of Fuel NOx Formation for Gas Turbine Conditions

[+] Author and Article Information
T. Nakata

Lawrence Livermore National Laboratory, P. O. Box 808, L-644, Livermore, CA 94550

M. Sato, T. Hasegawa

Central Research Institute of Electric Power Industry, Yokosuka 24001, Japan

J. Eng. Gas Turbines Power 120(3), 474-480 (Jul 01, 1998) (7 pages) doi:10.1115/1.2818169 History: Received September 20, 1997; Online November 19, 2007

Abstract

Ammonia contained in coal-gasified fuel is converted to nitrogen oxides (NOx ) in the combustion process of a gas turbine in integrated coal gasification combined cycle (IGCC) system. Research data on fuel-NOx formation are insufficient, and there still remains a wide explored domain. The present research aims at obtaining fundamental knowledge of fuel-NOx formation characteristics by applying reaction kinetics to gas turbine conditions. An instantaneous mixing condition was assumed in the cross section of a gas turbine combustor and both gradual mixing condition and instantaneous mixing condition were assumed at secondary air inlet section. The results may be summarized as follows: (1) in the primary combustion zone under fuel rich condition, HCN and other intermediate products are formed as ammonia contained in the fuel decomposes; (2) formation characteristics of fuel-NOx are affected by the condition of secondary air mixing; and (3) the conversion ratio from ammonia to NOx declines as the pressure inside the combustor rises under the condition of gradual mixing at the secondary air inlet. These results obtained agreed approximately with the experimentation.

Copyright © 1998 by The American Society of Mechanical Engineers
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