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Research Papers: Gas Turbines: Industrial & Cogeneration

A Parametric Thermodynamic Evaluation of High Performance Gas Turbine Based Power Cycles

[+] Author and Article Information
Rakesh K. Bhargava

 Foster Wheeler USA Corporation, 585 North Dairy Ashford, Houston, TX 77079

Michele Bianchi, Andrea De Pascale, Giorgio Negri di Montenegro, Antonio Peretto

DIEM, Università di Bologna, viale Risorgimento 2, 40136 Bologna, Italy

Stefano Campanari

Department of Energy, Politecnico di Milano, Via Lambruschini 4, 20156 Milano, Italy

J. Eng. Gas Turbines Power 132(2), 022001 (Nov 04, 2009) (14 pages) doi:10.1115/1.3155782 History: Received January 12, 2009; Revised March 30, 2009; Published November 04, 2009; Online November 04, 2009

This paper discusses the gas turbine performance enhancement approach that has gained a lot of momentum in recent years in which modified Brayton cycles are used with humidification or water/steam injection, termed “wet cycles,” or with fuel cells, obtaining “hybrid cycles.” The investigated high performance cycles include intercooled steam-injected gas turbine cycle, recuperated water injection cycle, humidified air turbine cycle, and cascaded humidified advanced turbine cycle, Brayton cycle with high temperature fuel cells (molten carbonate fuel cells or solid oxide fuel cells), and their combinations with the modified Brayton cycles. Most of these systems, with a few exceptions, have not yet become commercially available as more development work is required. The results presented show that the cycle efficiency achievable with the aforementioned high performance systems can be comparable or better than a combined cycle system, a currently commercially available power generation system having maximum cycle efficiency. The main emphasis of this paper is to provide a detailed parametric thermodynamic cycle analysis, using uniform design parameters and assumptions, of the above mentioned cycles and discuss their comparative performance including advantages and limitations. The performance of these cycles is also compared with the already developed and commercially available gas turbines without water/steam injection features, called “dry cycles.” In addition, a brief review of the available literature of the identified high performance complex gas turbine cycles is also included in this paper.

Copyright © 2010 by American Society of Mechanical Engineers
Topics: Cycles
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References

Figures

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Figure 1

Cycle efficiency, TIT, and β of simple cycle existing gas turbines

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Figure 2

Performance of selected GT dry cycles—effects of cycle pressure ratio on efficiency and specific work for a fixed TIT value of 1300°C(2370°F)

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Figure 3

RWI cycle layout and T-s diagram

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Figure 4

ISTIG cycle layout and T-s diagram

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Figure 5

HAT cycle layout and T-s diagram

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Figure 6

CHAT cycle layout and T-s diagram

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Figure 7

SOFC+GT cycle layout and T-s diagram

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Figure 8

SOFC+REC cycle layout and T-s diagram

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Figure 9

MCFC+GT cycle layout and T-s diagram

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Figure 10

Efficiency versus specific work for RWI cycle and comparison with ICR cycle

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Figure 11

Efficiency versus specific work for ISTIG cycle and comparison with IC and STIG cycles for TIT=1300°C

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Figure 12

Efficiency versus specific work for HAT cycle and comparison with ICR cycle

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Figure 13

Efficiency versus specific work for CHAT cycle and comparison with ICRHR cycle

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Figure 14

Variation of injected water flow rate for wet cycles

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Figure 15

Efficiency and work output as a function of pressure ratio for the SOFC+GT simple cycle (a) and for the SOFC+REC cycle (b). TIT indications are referred to both efficiency and work output for each FC Tech. case.

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Figure 16

Efficiency and work output for the SOFC+ICR GT cycle. TIT indications are referred to both efficiency and work output for each FC Tech. case.

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Figure 17

Efficiency and work output for the MCFC+GT hybrid cycle

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Figure 18

Commercially available CC power plants with different HRSG arrangements (1PL: one-pressure level; 2PL: two-pressure level; and 3PL+RH: three-pressure level with reheating)

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Figure 19

Efficiency versus specific work for 2PL CC and comparison with Brayton

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Figure 20

Comparison of examined cycles with selected dry cycles and CC (TIT=1500°C)

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Figure 21

Comparison of examined cycles with selected dry cycles and CC (TIT=1300°C): (a) efficiency versus specific work, (b) effect of β on efficiency, and (c) effect of β on specific work

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