Thermodynamic Analyses of Wet Compression Process in the Compressor of Gas Turbine

Zheng, Qun; Sun, Yuxiang; Li, Shuying; Wang, Yunhui

doi:10.1115/1.1575254

Cited by 74 publications

(25 citation statements)

References 2 publications

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“…The enthalpy of combustion of the gases at any temperature is given by the equation (10) [11] and the fuel used in the combustion is natural gas (methane) 4 CH , the enthalpy is given by zero value of the ambient pressure 1 bar and temperature of 15°C.…”

Section: Thermodynamic Equationsmentioning

confidence: 99%

“…Cooling and heating degree-hours or cooling and heating degree-days play significant roles in managing air-conditioning equipment, energy planning (both generation and consumption) and estimating cooling and heating loads [4]. Erbs used twenty years hourly data for nine locations across United States of America to compute cooling degree-days for base temperature between 10°C and 29°C.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Climate Effects on Cooling Degree-Hours and Evaporative Cooling of Gas Turbine

Kofar-Bai¹,

Zheng²

2017

JOCET

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Section: Thermodynamic Equationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Climate Effects on Cooling Degree-Hours and Evaporative Cooling of Gas Turbine

Kofar-Bai¹,

Zheng²

2017

JOCET

Self Cite

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“…Utamura [15] showed experimentally that 1% of injection ratio in wet compression leads to 8% increase in power delivery. Wet compression in gas turbines has been thoroughly investigated by many researchers as Zheng et al [16], White and Meacock [17], Kim and Perez-Blanco [18], Perez-Blanco et al [19], Bracco et al [20], Roumeliotis and Mathioudakis [21], Jonsson et al [22], Goldborough et al [23]. Kim et al [24] developed a modeling for the transient operations for the non-equilibrium wet compression process based on droplet evaporation and obtained the analytic expressions with algebraic equations as solutions.…”

Section: Introductionmentioning

confidence: 99%

Exergy Analysis of Overspray Process in Gas Turbine Systems

Kim

2012

Energies

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Gas turbine power can be augmented by overspray process which consists of inlet fogging and wet compression. In this study exergy analysis of the overspray process in gas turbine system is carried out with a non-equilibrium analytical modeling based on droplet evaporation and the second law of thermodynamics. This work focuses on the effects of system parameters such as pressure ratio, water injection ratio, and initial droplet diameter on exergetical performances including irreversibility and exergy efficiency of the process. The process performances are also estimated under the condition of saturated water injection ratio above which complete evaporation of injected water droplets within a compressor is not possible. The results show that the irreversibility increases but the saturated irreversibility decreases with increasing initial droplet diameter for a specified pressure ratio.

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“…Inter cooling between compressor stages is one such method used. But this method may lead to the overall decrease in the cycle efficiency (Zheng et al, 2003). Inlet fogging is another widely used process to achieve compressor work reduction.…”

Section: Introductionmentioning

confidence: 99%

Thermo-Fluid Dynamics of the Effects of Water Spray on Air Compression Process

Mohan

Suryan²,

Doh

et al. 2017

European Conference on Turbomachinery Fluid Dynamics and Hermodynamics

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In a conventional gas turbine setup, a majority of the output power (more than 60%) from the turbine is spent as compressor work. In order to increase the effective output power of the system, it is necessary to cut down the input power requirement of the compressor. In industries techniques such as 'Wet Compression'are employed to achieve this reduction.The process takes advantage of the high enthalpy of vaporization of water droplets to achieve reduction in the overall temperature of the compressed medium. It is established that the thermodynamic work required for the compression of a fluid increases monotonically with the increase in fluid temperature. In wet compression process, during the compression of the fluid (i.e. air), fine droplets of water are injected into the medium. The droplets absorb heat from the surrounding medium and start evaporating; thereby reducing the temperature of air which in turn decreases the compressor work. In addition to this the mass flow rate of the fuel required by the gas turbine system increases in order to maintain its oxidizer-fuel (O/F) ratio, thereby generating extra power output. To study the fundamental thermodynamic process behind wet compression, a cylinder-piston system containing fine droplets of water suspended in air is considered. The axial inward movement of piston enables compression of the fluid mixture. Properties such as pressure, temperature and relative humidity of compressed air are studied in detail for different parameters such as compression rates, droplet diameter and droplet mass. Thermodynamic curves are generated and power savings achieved via wet compression process are calculated. From the results it is seen that smaller sized droplets, slower speeds of compression and higher percentages of overspray lead towards a higher reduction in compressor work.

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Thermodynamic Analyses of Wet Compression Process in the Compressor of Gas Turbine

Cited by 74 publications

References 2 publications

Climate Effects on Cooling Degree-Hours and Evaporative Cooling of Gas Turbine

Climate Effects on Cooling Degree-Hours and Evaporative Cooling of Gas Turbine

Exergy Analysis of Overspray Process in Gas Turbine Systems

Thermo-Fluid Dynamics of the Effects of Water Spray on Air Compression Process

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