Exergy, economic &amp; environmental (3E) analysis of inlet fogging for gas turbine power plant

Ehyaei, M.A.; Mozafari, A.; Alibiglou, M.H.

doi:10.1016/j.energy.2011.10.011

Cited by 49 publications

(63 citation statements)

References 30 publications

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“…Although the installation of cooling systems and their use is somewhat costly, they prevent a loss of power and waste of energy (due to higher total efficiency), generally decreasing the total costs of energy provision and eliminating the need for installation of additional gas turbines [5][6][7]. Thus the additional costs for inlet cooling are usually offset by the economic savings it provides.…”

Section: Introductionmentioning

confidence: 99%

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Exergy, Economic and Environmental Analyses of Gas Turbine Inlet Air Cooling with a Heat Pump Using a Novel System Configuration

2015

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Gas turbines incur a loss of output power during hot seasons due to high ambient air temperatures, and input air cooling systems are often used to partly offset this problem. Here, results are reported for an investigation of the utilization of a heat pump to cool the inlet air of a gas turbine compressor. The analyses are carried out for two climates: the city of Yazd, Iran, which has a hot, arid climate, and Tehran, Iran, which has a temperate climate. The heat pump input power is obtained from the gas turbine. The following parameters are determined, with and without the heat pump: net output power, first and second law efficiencies, quantities and costs of environmental pollutants, entropy generation and power generation. The results suggest that, by using the air-inlet cooling system, the mean output power increases during hot seasons by 11.5% and 10% for Yazd and Tehran, respectively, and that the costs of power generation (including pollution costs) decrease by 11% and 10% for Yazd and Tehran, respectively. Also, the rate of generation of pollutants such as NOx and CO decrease by about 10% for Yazd and 35% for Tehran, while the average annual entropy generation rate increases by 9% for Yazd and 7% for Tehran, through air-inlet cooling. The average increase of the system first law efficiency is 2% and of the system second law efficiency is 1.5% with the inlet-air cooling system. OPEN ACCESSSustainability 2015, 7 14260

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Section: Introductionmentioning

confidence: 99%

“…It has been shown that, for every Centigrade degree of decrease in the air input to a gas turbine system, the output power increases by 0.5% to 1% [5][6][7]. More than 700 gas turbine units around the world are equipped with input air cooling systems.…”

Section: Introductionmentioning

confidence: 99%

Exergy, Economic and Environmental Analyses of Gas Turbine Inlet Air Cooling with a Heat Pump Using a Novel System Configuration

2015

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“…As its temperature is lowered, its relative humidity is increased. The gas turbine though a constant volume system; the evaporative inlet air cooler modifies the relative humidity, and pressure of the air, thus increasing the density and mass of the working fluid [19].…”

Section: B Evaporative Coolermentioning

confidence: 99%

“…The exergy at different Points of the plant is gotten using (19) and (20), where and are the thermal and pressure exergy at any point respectively measured in MW. m, Cp, TK, Tref, are the mass of working fluid at any point, specific heat capacity of the working fluid at any point within the plant, temperature of the working fluid at any point within the plant, and the ambient temperature respectively.…”

Section: B Exergy Analysismentioning

confidence: 99%

Comparative Energy and Exergy Analysis of a Thermal Power Plant With/Without Retrofitted Inlet Air Cooler: A Case Study

Aliu¹,

Ochornma²

2018

EJERS

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The result of this study shows the performance of Ihovbor Gas Power Plant in Benin, Edo State Nigeria using first and second law of thermodynamics. Analysing the efficiency of the plant using first law of thermodynamics showed that with increase in inlet air temperature, the energy conversion efficiency of the plant reduces. The exergy efficiency of the plant also confirmed that increase in inlet air temperature results in decrease of the exergetic efficiency of the plant. Analysis of each of the components showed the greatest destruction of exergy was in the combustion chamber while the least is the Gas turbine section. Using numerical method in analyzing the gas turbine plant when retrofitting with an evaporative inlet air cooler showed better performance in energy conversion as power generation increased with an average of 1% per 1oC degree fall in temperature, the work ratio and thermal efficiency of the plant also increased. The analysis of the modified plant using second law of thermodynamics showed an increase in magnitude of both the exergy destroyed and the efficiency of the plant. Analysis showed that integrating evaporative cooler as component of the inlet air cooler increases the efficiency of the Air compressor by over 0.8% thus increasing the plant’s exergetic efficiency.

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“… Overspray fogging (spraying more water into the air stream than can be evaporated,) [2][3][4]: The quantity of water injected into the inlet air exceeds greatly the amount required for air saturation. Hence, a percentage of the water (often ~2%) remains in a liquid phase (i.e., as overspray) and enters the compressor for evaporation there.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Analysis of a Power Plant Integrated with Fogging Inlet Cooling and a Biomass Gasification

et al. 2015

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Biomass energy and especially biofuels produced by biomass gasification are clean and renewable options for power plants. Also, on hot days the performance of gas turbines decreases substantially, a problem that can be mitigated by fog cooling. In the present paper, a biomass-integrated fogging steam injected gas turbine cycle is analyzed with energy and exergy methods. It is observed that (1) increasing the compressor pressure ratio raises the air flow rate in the plant but reduces the biomass flow rate; (2) increasing the gas turbine inlet temperature decreases the air and biomass flow rates; (3) increasing the compressor pressure ratio raises the energy and exergy efficiencies, especially at lower pressure ratios; (4) increasing the gas turbine inlet temperature raises both efficiencies; and (5) overspray increases the energy efficiency and net cycle power slightly. The gas turbine exhibits the highest exergy efficiency of the cycle components and the combustor the lowest. A comparison of the cycle with similar cycles fired by natural gas and differently configured cycles fueled by biomass shows that the cycle with natural gas firing has an energy efficiency 18 percentage points above the biomass fired cycle, and that steam injection increases the OPEN ACCESSSustainability 2015, 7 1293 energy efficiency about five percentage points relative to the cycle without steam injection. Also, the influence of steam injection on energy efficiency is more significant than fog cooling.

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Exergy, economic & environmental (3E) analysis of inlet fogging for gas turbine power plant

Cited by 49 publications

References 30 publications

Exergy, Economic and Environmental Analyses of Gas Turbine Inlet Air Cooling with a Heat Pump Using a Novel System Configuration

Exergy, Economic and Environmental Analyses of Gas Turbine Inlet Air Cooling with a Heat Pump Using a Novel System Configuration

Comparative Energy and Exergy Analysis of a Thermal Power Plant With/Without Retrofitted Inlet Air Cooler: A Case Study

Thermodynamic Analysis of a Power Plant Integrated with Fogging Inlet Cooling and a Biomass Gasification

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