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Research Papers: Energy Conversion/Systems

Optimum Performance Improvements of the Combined Cycle Based on an Intercooler–Reheated Gas Turbine

[+] Author and Article Information
Thamir K. Ibrahim

Faculty of Mechanical Engineering,
Universiti Malaysia Pahang,
Pekan, Pahang 26600, Malaysia
Mechanical Engineering Department,
College of Engineering,
University of Tikrit,
Tikrit 42, Iraq
e-mail: thamirmathcad@yahoo.com

M. M. Rahman

Faculty of Mechanical Engineering,
Universiti Malaysia Pahang,
Pekan, Pahang 26600, Malaysia
e-mail: mustafizur@ump.edu.my

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received December 23, 2014; final manuscript received April 14, 2015; published online May 14, 2015. Assoc. Editor: S. O. Bade Shrestha.

J. Energy Resour. Technol 137(6), 061601 (Nov 01, 2015) (11 pages) Paper No: JERT-14-1424; doi: 10.1115/1.4030447 History: Received December 23, 2014; Revised April 14, 2015; Online May 14, 2015

The performance enhancements and modeling of the gas turbine (GT), together with the combined cycle gas turbine (CCGT) power plant, are described in this study. The thermal analysis has proposed intercooler–reheated-GT (IHGT) configuration of the CCGT system, as well as the development of a simulation code and integrated model for exploiting the CCGT power plants performance, using the matlab code. The validation of a heavy-duty CCGT power plants performance is done through real power plants, namely, MARAFIQ CCGT plants in Saudi Arabia with satisfactory results. The results from this simulation show that the higher thermal efficiency of 56% MW, while high power output of 1640 MW, occurred in IHGT combined cycle plants (IHGTCC), having an optimal turbine inlet temperature about 1900 K. Furthermore, the CCGT system proposed in the study has improved power output by 94%. The results of optimization show that the IHGTCC has optimum power of 1860 MW and thermal efficiency of 59%. Therefore, the ambient temperatures and operation conditions of the CCGT strongly affect their performance. The optimum level of power and efficiency is seen at high turbine inlet temperatures and isentropic turbine efficiency. Thus, it can be understood that the models developed in this study are useful tools for estimating the CCGT power plant's performance.

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Figures

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Fig. 1

A schematic diagram of the supplementary firing triple-pressure steam-reheat combined cycle power plant based on an IHGT

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Fig. 2

Temperature–entropy diagram of IHGT cycle

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Fig. 3

A typical temperature heat transfer diagram for supplementary firing triple-pressure reheat HRSG combined cycle

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Fig. 4

Temperature–entropy diagram for supplementary firing triple-pressure reheat HRSG combined cycle

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Fig. 5

(a) Two-input first-order Sugeno fuzzy model with two rules. (b) Equivalent ANFIS architecture.

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Fig. 9

Effect of the isentropic turbine efficiency on the performance of CCGT for simple cycle and intercooler–reheated cycle of the GT: (a) thermal efficiency, (b) power, and (c) SFC

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Fig. 8

Effect of the turbine inlet temperature on the performance of CCGT for simple cycle and intercooler–reheated cycle of the GT: (a) thermal efficiency, (b) power, and (c) SFC

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Fig. 7

Effect of the ambient temperature on the performance of CCGT for simple cycle and intercooler–reheated cycle of the GT: (a) thermal efficiency, (b) power, and (c) SFC

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Fig. 6

Effect of the compression ratio on the performance of CCGT for simple cycle and intercooler–reheated cycle of the GT: (a) thermal efficiency, (b) power, and (c) SFC

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Fig. 10

IHGTCC performance trends with peak parameters: (a) thermal efficiency, (b) power, and (c) SFC

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