Research Papers: Gas Turbines: Industrial & Cogeneration

Progress of the 40 MW-Class Advanced Humid Air Turbine Tests

[+] Author and Article Information
Manabu Yagi

e-mail: manabu.yagi.cb@hitachi.com

Hidefumi Araki

e-mail: hidefumi.araki.qn@hitachi.com

Hisato Tagawa

e-mail: hisato.tagawa.cg@hitachi.com

Tomomi Koganezawa

e-mail: tomomi.koganezawa.hw@hitachi.com

Chihiro Myoren

e-mail: chihiro.myoren.uc@hitachi.com

Takuya Takeda

e-mail: takuya.takeda.qr@hitachi.com
Hitachi Research Laboratory,
Hitachi, Ltd.,
832-2 Horiguchi, Hitachinaka-shi,
Ibaraki 312-0034, Japan

Contributed by the Industrial and Cogeneration Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received July 2, 2013; final manuscript received July 7, 2013; published online September 17, 2013. Editor: David Wisler.

J. Eng. Gas Turbines Power 135(11), 112002 (Sep 17, 2013) (7 pages) Paper No: GTP-13-1219; doi: 10.1115/1.4025037 History: Received July 02, 2013; Revised July 07, 2013

A 40 MW-class test facility has been constructed to verify practicability of applying the advanced humid air turbine (AHAT) system to a heavy-duty gas turbine. Verification tests have been carried out from January 2012, and interaction effects between the key components were established. First, water atomization cooling (WAC) was confirmed to contribute to both increased mass flow rate and pressure ratio for the axial-flow compressor. The good agreement between measured and calculated temperatures at the compressor discharge was also confirmed. These results demonstrated the accuracy of the developed prediction model for the WAC. Second, a control method that realized both flame stability and low nitrogen oxides (NOx) emissions was verified. Although the power output and air humidity were lower than the rated values, NOx concentration was about 10 ppm. Finally, a hybrid nozzle cooling system, which utilized both compressor discharged air and humid air, was developed and tested. The metal surface temperatures of the first stage nozzles were measured, and they were kept under the permissible metal temperature. The measured temperatures on the metal surface reasonably corresponded with calculation results.

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Fig. 1

Schematic diagram of AHAT system

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Fig. 2

Target output and efficiency for AHAT system [7]

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Fig. 3

Schematic drawing of 40 MW-class AHAT test facility

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Fig. 4

Photo of 40MW-class AHAT test facility

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Fig. 5

Photo of the H-50 gas turbine

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Fig. 6

Photo of installed WAC nozzles

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Fig. 7

Overview of measurement system for evaluating the effect of WAC [11]

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Fig. 8

Photo of the humidifier

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Fig. 9

Internal stream lines of the humidifier

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Fig. 10

Cluster nozzle burners of combustor

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Fig. 11

Cross-sectional view of hybrid cooling first stage nozzle

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Fig. 12

Axial distributions of temperature in the compressor

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Fig. 13

Test results of half load operation

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Fig. 14

(a) Thermocouple positions for measuring metal temperatures of the hybrid cooling nozzle. (b) Measured metal temperatures of first stage nozzle.



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