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RESEARCH PAPERS: Gas Turbines: Cycle Innovations

Conceptual Design of the Cooling System for 1700°C-Class, Hydrogen-Fueled Combustion Gas Turbines

[+] Author and Article Information
N. Kizuka, K. Sagae, S. Anzai, S. Marushima, T. Ikeguchi, K. Kawaike

Power Industrial Systems, R&D Division, Hitachi Ltd., 832-2 Horiguchi, Hitachinaka-shi Ibaraki-ken, 312–0034, Japan

J. Eng. Gas Turbines Power 121(1), 108-115 (Jan 01, 1999) (8 pages) doi:10.1115/1.2816296 History: Received April 01, 1998; Online November 19, 2007

Abstract

The effects of three types of cooling systems on the calculated operating performances of a hydrogen-fueled thermal power plant with a 1,700°C-class gas turbine were studied with the goal of attaining a thermal efficiency of greater than 60 percent. The combination of a closed-circuit water cooling system for the nozzle blades and a steam cooling system for the rotor blades was found to be the most efficient, since it eliminated the penalties of a conventional open-circuit cooling system which ejects coolant into the main hot gas stream. Based on the results, the water cooled, first-stage nozzle blade and the steam cooled first-stage rotor blade were designed. The former features array of circular cooling holes close to the surface and uses a copper alloy taking advantage of recent coating technologies such as thermal barrier coatings (TBCs) and metal coatings to decrease the temperature and protect the blade core material. The later has cooling by serpentine cooling passages with V-shaped staggered turbulence promoter ribs which intensify the internal cooling.

Copyright © 1999 by The American Society of Mechanical Engineers
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