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Research Papers: Energy Systems Analysis

A Thermo-Environmental Evaluation of a Modified Combustion Gas Turbine Plant

[+] Author and Article Information
Abdul Khaliq

Mechanical Engineering Department,
King Fahd University of Petroleum and
Minerals (KFUPM),
Dhahran 31261, Saudi Arabia
e-mail: khaliqsb@gmail.com

M. A. Habib

Mechanical Engineering Department,
King Fahd University of Petroleum and
Minerals (KFUPM),
Dhahran 31261, Saudi Arabia
e-mail: mahabib@kfupm.edu.sa

Keshavendra Choudhary

Department of Mechanical Engineering,
People's University,
Bhopal 462022,
Madhya Pradesh, India
e-mail: keshavendra@gmail.com

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received May 14, 2018; final manuscript received October 23, 2018; published online November 30, 2018. Editor: Hameed Metghalchi.

J. Energy Resour. Technol 141(4), 042004 (Nov 30, 2018) (13 pages) Paper No: JERT-18-1341; doi: 10.1115/1.4041898 History: Received May 14, 2018; Revised October 23, 2018

This paper reports the comprehensive thermodynamic modeling of a modified combustion gas turbine plant where Brayton refrigeration cycle was employed for inlet air cooling along with evaporative after cooling. Exergetic evaluation was combined with the emission computation to ascertain the effects of operating variables like extraction pressure ratio, extracted mass rate, turbine inlet temperature (TIT), ambient relative humidity, and mass of injected water on the thermo-environmental performance of the gas turbine cycle. Investigation of the proposed gas turbine cycle revealed an exergetic output of 33%, compared to 29% for base case. Proposed modification in basic gas turbine shows a drastic reduction in cycle's exergy loss from 24% to 3% with a considerable decrease in the percentage of local irreversibility of the compressor from 5% to 3% along with a rise in combustion irreversibility from 19% to 21%. The environmental advantage of adding evaporative after cooling to gas turbine cycle along with inlet air cooling can be seen from the significant reduction of NOx from 40 g/kg of fuel to 1 × 10−9 g/kg of fuel with the moderate increase of CO concentration from 36 g/kg of fuel to 99 g/kg of fuel when the fuel–air equivalence ratio reduces from 1.0 to 0.3. Emission assessment further reveals that the increase in ambient relative humidity from 20% to 80% causes a considerable reduction in NOx concentration from 9.5 to 5.8 g/kg of fuel while showing a negligible raise in CO concentration from 4.4 to 5.0 g/kg of fuel.

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Figures

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Fig. 1

Schematic diagram of the modified gas turbine cycle

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Fig. 2

Change in temperature of primary zone with equivalence ratio

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Fig. 3

Effect of extraction pressure ratio on the first and second law efficiencies

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Fig. 4

Effect of extracted mass ratio on the first and second law efficiencies

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Fig. 5

Effect of turbine inlet temperature on the first and second law efficiencies

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Fig. 6

Effect of ambient relative humidity on the first and second law efficiencies

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Fig. 7

Effect of water-to-air ratio (WAR) on the first and second law efficiencies

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Fig. 8

Exergy balance of a basic gas turbine cycle

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Fig. 9

Exergy balance of a modified gas turbine cycle

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Fig. 10

Individual components' second law efficiency of major components of a basic gas turbine cycle and modified gas turbine cycle

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Fig. 11

Variation of formation of NOx and CO in the combustion chamber and reheater with the change in equivalence ratio

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Fig. 12

Variation of formation of NOx and CO in the combustion chamber and reheater with the change in ambient relative humidity

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Fig. 13

Variation of formation of NOx and CO in the combustion chamber and reheater with the change in overall pressure ratio

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