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TECHNICAL PAPERS: Gas Turbines: Cycle Innovations

Design and Off-Design Characteristics of the Alternative Recuperated Gas Turbine Cycle With Divided Turbine Expansion

[+] Author and Article Information
Sung Hoon Hwang, Soo Hyoung Yoon

Department of Mechanical Engineering,  Inha University, 253 Yonghyun-Dong, Nam-Gu, Incheon 402-751, Korea

Tong Seop Kim1

Department of Mechanical Engineering,  Inha University, 253 Yonghyun-Dong, Nam-Gu, Incheon 402-751, Koreakts@inha.ac.kr

1

Corresponding author.

J. Eng. Gas Turbines Power 129(2), 428-435 (Feb 01, 2006) (8 pages) doi:10.1115/1.2364195 History: Received October 01, 2005; Revised February 01, 2006

In order to fully address the characteristics of the alternative recuperated cycle with divided turbine expansion, both design and off-design analyses have been performed. Two types of mechanical design are assumed: two shaft and single shaft. In particular, optimal pressure ratio division between the high- and low-pressure turbines is evaluated for the single-shaft configuration. It is predicted that the alternative recuperated cycle hardly exhibits sensible design efficiency advantage over the conventional recuperated cycle for moderate turbine inlet conditions and with usual component performances. An advantage of the alternative cycle with single-shaft design is that thermal efficiency is less sensitive to compressor pressure ratio compared to other configurations, and we can also have flexibility in the turbine division without much efficiency loss. The part load analyses have been carried out with the aid of realistic component maps and models for off-design operation. In addition to the general fuel only control, a variable speed control is assumed as the part load operating strategy of the single-shaft configuration. Obvious advantage with the alternative cycle is observed in the variable speed operation of the single-shaft design. With this strategy, the part load efficiency of the alternative cycle is far superior to the conventional cycle. Almost constant efficiency is predicted for a wide power range.

Copyright © 2007 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Temperature–entropy diagrams of conventional and alternative recuperated cycles: (a) conventional cycle and (b) alternative cycle

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Figure 2

Effect of compressor and turbine efficiencies on thermal efficiency (working medium: air, t=4, recuperator effectiveness=1.0)

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Figure 3

Effect of recuperator effectiveness on thermal efficiency (working medium: air, t=4, compressor and turbine efficiency=1.0)

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Figure 4

Combined effects of compressor and turbine efficiencies and recuperator effectiveness on thermal efficiency (working medium: air, t=4, ηreg=0.9)

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Figure 5

Thermal efficiency versus compressor pressure ratio

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Figure 6

Specific power versus compressor pressure ratio

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Figure 7

Optimal pressure ratio of the high-pressure turbine

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Figure 8

Examples of dependence of thermal efficiency of the single shaft on the pressure ratio setting of the high-pressure turbine (TIT=1100K)

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Figure 9

Recuperator inlet temperature

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Figure 10

Example of the compressor map

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Figure 11

Variation in the compressor pressure ratio for the part load operation

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Figure 12

Variations in the hot side temperatures for the part load operation of the conventional cycle

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Figure 13

Variations in the hot side temperatures for the part load operation of the alternative cycle

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Figure 14

Variation in part load efficiency of the conventional cycle

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Figure 15

Variation in part load efficiency of the alternative cycle

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