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Research Papers: Gas Turbines: Cycle Innovations

Experimental and Analytical Study on the Operation Characteristics of the AHAT System

[+] Author and Article Information
Hidefumi Araki

shinichi.higuchi.yf@hitachi.com Hitachi, Ltd., Hitachi Research Laboratory, 832-2 Horiguchi, Hitachinaka, Ibaraki, 312-0034, Japanhidefumi.araki.qn@hitachi.com

Tomomi Koganezawa

shinichi.higuchi.yf@hitachi.com Hitachi, Ltd., Hitachi Research Laboratory, 832-2 Horiguchi, Hitachinaka, Ibaraki, 312-0034, Japantomomi.koganezawa.hw@hitachi.com

Chihiro Myouren

shinichi.higuchi.yf@hitachi.com Hitachi, Ltd., Hitachi Research Laboratory, 832-2 Horiguchi, Hitachinaka, Ibaraki, 312-0034, Japanchihiro.myoren.uc@hitachi.com

Shinichi Higuchi

shinichi.higuchi.yf@hitachi.com Hitachi, Ltd., Hitachi Research Laboratory, 832-2 Horiguchi, Hitachinaka, Ibaraki, 312-0034, Japan

Toru Takahashi

 Central Research Institute of Electric Power Industry, 2-6-1 Nagasaka, Yokosuka, Kanagawa, 240-0196, Japantoru-tak@criepi.denken.or.jp

Takashi Eta

 Sumitomo Precision Products Co., Ltd., 1-10 Fuso, Amagasaki, Hyogo, 660-0891, Japaneta-t@spp.co.jp

J. Eng. Gas Turbines Power 134(5), 051701 (Mar 01, 2012) (8 pages) doi:10.1115/1.4004732 History: Received June 17, 2011; Revised July 22, 2011; Published March 01, 2012; Online March 01, 2012

Operational flexibility, such as faster start-up time or faster load change rate, and higher thermal efficiency, have become more and more important for recent thermal power systems. The advanced humid air turbine (AHAT) system has been studied to improve operational flexibility and thermal efficiency of the gas turbine power generation system. Advanced humid air turbine is an original system which substitutes the water atomization cooling (WAC) system for the intercooler system of the HAT cycle. A 3 MW pilot plant, which is composed of a gas turbine, a humidification tower, a recuperator and a water recovery system, was built in 2006 to verify feasibility of the AHAT system.In this paper, ambient temperature effects, part-load characteristics and start-up characteristics of the AHAT system were studied both experimentally and analytically. Also, change in heat transfer characteristics of the recuperator of the 3 MW pilot plant was evaluated from Nov. 2006 to Feb. 2010. Ambient temperature effects and part-load characteristics of the 3 MW pilot plant were compared with heat and material balance calculation results. Then, these characteristics of the AHAT and the combined cycle (CC) systems were compared assuming they were composed of mid-sized industrial gas turbines.The measured cold start-up time of the 3 MW AHAT pilot plant was about 60 min, which was dominated by the heat capacities of the plant equipment. The gas turbine was operated a total of 34 times during this period (Nov. 2006 to Feb. 2010), but no interannual changes were observed in pressure drops, temperature effectiveness, and the overall heat transfer coefficient of the recuperator.

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Copyright © 2012 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Calculated thermal efficiency of AHAT and other gas turbine systems

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Figure 2

Schematic of the AHAT system

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Figure 3

Photo of the 3 MW AHAT pilot plant

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Figure 4

Measured and predicted ambient temperature effects seen in the 3 MW pilot plant

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Figure 5

Predicted ambient temperature effects of the mid-sized AHAT and CC plants

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Figure 6

Measured humidification rates for the humidification tower and the WAC at part-load operations of the 3 MW pilot plant

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Figure 7

Measured and predicted part-load characteristics of the 3 MW pilot plant

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Figure 8

Part-load characteristics of AHAT and CC plants

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Figure 9

Turbine speed, power output, humidification rate, and turbine entry temperature of the 3 MW AHAT pilot plant during the start-up

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Figure 10

Interannual changes of gas side and air side pressure drops of the recuperator

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Figure 11

Interannual changes of the overall heat transfer coefficient and the temperature effectiveness of the recuperator

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