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Research Papers: Gas Turbines: Cycle Innovations

# Development of Elemental Technologies for Advanced Humid Air Turbine System

[+] Author and Article Information
Hidetoshi Kuroki, Shigeo Hatamiya, Takanori Shibata, Tomomi Koganezawa, Nobuaki Kizuka, Shinya Marushima

Hitachi Ltd. Power & Industrial Systems R&D Laboratory, 7-2-1 Omika-cho, Hitachi-shi 319-1221 Japan

J. Eng. Gas Turbines Power 130(3), 031701 (Mar 26, 2008) (6 pages) doi:10.1115/1.2833490 History: Received June 20, 2006; Revised October 13, 2007; Published March 26, 2008

## Abstract

The advanced humid air turbine (AHAT) system improves the thermal efficiency of gas turbine power generation by using a humidifier, a water atomization cooling (WAC) system, and a heat recovery system, thus eliminating the need for an extremely high firing temperature and pressure ratio. The following elemental technologies have been developed to realize the AHAT system: (1) a broad working range and high-efficiency compressor that utilizes the WAC system to reduce compression work, (2) turbine blade cooling techniques that can withstand high heat flux due to high-humidity working gas, and (3) a combustor that achieves both low $NOx$ emissions and a stable flame condition with high-humidity air. A gas turbine equipped with a two-stage radial compressor (with a pressure ratio of 8), two-stage axial turbine, and a reverse-flow type of single-can combustor has been developed based on the elemental technologies described above. A pilot plant that consists of a gas turbine generator, recuperator, humidification tower, water recovery system, WAC system, economizer, and other components is planned to be constructed, with testing slated to begin in October 2006 to validate the performance and reliability of the AHAT system. The expected performance is as follows: thermal efficiency of 43% (LHV), output of $3.6MW$, and $NOx$ emissions of less than $10ppm$ at 15% O2. This paper introduces the elemental technologies and the pilot plant to be built for the AHAT system.

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## Figures

Figure 1

Schematic of AHAT system

Figure 4

3MW AHAT pilot plant arrangement

Figure 5

Relationship between cooling efficiency of WAC and residence time

Figure 8

Second-stage diffuser

Figure 15

NOx emission as function of gas turbine load

Figure 14

Mixture analysis result of coaxial jet cluster nozzle burner

Figure 13

Cluster burner

Figure 12

Calculation result of mean section temperature in first rotor blade

Figure 11

Figure 10

Calculation result of mean section temperature in first-stage stator blade

Figure 9

Figure 7

Comparison of compressor characteristics between tandem and channel diffusers

Figure 6

Relative Mach number distribution of first-stage impeller

Figure 3

Development schedule of AHAT pilot plant

Figure 2

WAC system

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