MAT, a novel, open cycle gas turbine for power augmentation

Utamura, Motoaki; Takehara, Isao; Karasawa, Hidetoshi

doi:10.1016/s0196-8904(98)00088-0

Cited by 29 publications

(3 citation statements)

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“…Utamura et al [2] reported that about 1% injection of normal temperature water by spray nozzles at inlet duct had a potential to increase the power output by several percent.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulations on Droplet Coalescence in an L-shaped Duct for Inlet Fogging of Gas Turbine Engines

Hamdani

Utamura

Shibata

et al. 2015

JGPP

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Numerical model is developed in order to characterize the water droplet coalescence at the air intake duct of a gas turbine assumed under operation of Inlet Fogging System. Water droplet size is treated as a randomly distributed parameter instead of a single size representative diameter. The numerical calculation is executed by ANSYS Fluent ® v.14.5 in a simple rectangular duct and verified using experimental data. The calculated evaporation time of an isolated water droplet in an infinite room shows a good agreement with experimental data. With fogging amount below saturation condition, injected water droplets with size distributions take a longer time to evaporate and it leads to a lower cooling efficiency than the one calculated using a single representative diameter. Then, the model is used to investigate droplet coalescence phenomena in an L-shaped duct geometry. It is shown that the L-shaped duct enhances coalescence due to drift behind the corner of L-duct. This reproduces larger droplets, therefore lower evaporation efficiency and increase of the water drainage.

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“…Utamura et al [2] reported that about 1% injection of normal temperature water by spray nozzles at inlet duct had a potential to increase the power output by several percent.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulations on Droplet Coalescence in an L-shaped Duct for Inlet Fogging of Gas Turbine Engines

Hamdani

Utamura

Shibata

et al. 2015

JGPP

View full text Add to dashboard Cite

show abstract

“…Because of short installation time and low installation cost of gas turbines, they are often used to meet this great demand. One disadvantage that penalizes the gas turbine peaking plant rating is the inversely proportional effect of the ambient temperature on the gas turbine output [1,2]. The gas turbines typically produce 30 per cent higher output at −6.6 • C than at 35 • C. Thus, the cost of installing a gas turbine or a combined cycle plant rated at 35 • C is 20-30 per cent higher than that rated at −6.6 • C. This inherent disadvantage of reduced gas turbine output at high ambient temperatures can be mitigated by the reduction of compressor inlet air temperature that increases air density and mass flowrate of working fluids.…”

Section: Introductionmentioning

confidence: 99%

Energy and exergy analyses of compressor inlet air-cooled gas turbines using the Joule—Brayton refrigeration cycle

Khaliq

Choudhary

Dinçer

2008

Proceedings of the Institution of Mechanical Engineers, Part A:

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In this article, a novel method of inlet air cooling is proposed to enhance the performance of a gas turbine operating in hot climates. The intake air at the compressor bell-mouth is cooled by an air Brayton refrigerator driven by the gas turbine, and the refrigerator uses air as the working fluid. Introducing the air refrigeration cycle provides the advantage of quite low temperatures close to 0 °C and even lower. This is not possible with other methods of intake air cooling, namely evaporative cooling or use of waste heat-driven absorption machines. A thermodynamic analysis through energy and exergy is employed, and a comprehensive parametric study is performed to investigate the effects of extraction pressure ratio, extracted mass rate, turbine inlet temperature (TIT), and ambient relative humidity (RH) on increase in net work output, first law efficiency, and second law efficiency of a compressor inlet air-cooled gas turbine cycle using a Joule—Brayton refrigerator. The analysis of the results indicates that the maximum exergy destroyed in the combustion chamber, which represents>80 per cent of the total exergy destruction in the overall system, is significantly affected by the extraction pressure ratio and TIT and is slightly affected by ambient RH. The increase in the net work output, the first law efficiency, and the second law efficiency of the cycle significantly varies with a change in the extraction pressure ratio, extraction mass rate, TIT, and ambient RH. Results clearly show that performance evaluation based on first law analysis alone is not adequate, and hence more meaningful evaluation must include second law analysis. Decision-makers should find the methodology presented in this article useful in comparison and selection of various methods for inlet air cooling in gas turbines.

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“…A moisture air turbine (MAT) cycle was proposed by Utamura et al (6) for improving the performance of land based gas turbines by injecting atomized water through inlet into compressors. In their study, the output of the gas turbine can be increased by 10% using 1% fogging (water spray/incoming air ratio) under 35…”

Section: Introductionmentioning

confidence: 99%

Power Augmentation Study of a Combined Cycle Power Plant Using Inlet Fogging

Chiang

Wang

2006

JSME international journal. Ser. B, Fluids and thermal engineer

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The power output of gas turbines decreases as a result of increased ambient temperature. One way to recover the output loss is to cool the inlet air. In Taiwan, most gas turbines operate with combined cycle for base load. Only a small portion operates with simple cycle for peak load. Therefore, the power augmentation strategies for combined cycle power plants need to be studied in advance in order to recover the power loss due to increased ambient temperature in hot summer days. The objective of this research is to study the effects caused by adding an inlet fogging system to an existing gas turbine-based combined cycle plant. Moreover, this paper also includes a parametric study of plant performance with different effectiveness of the inlet fogging system based on the average ambient conditions. Results from this study can be used as a guideline for combined cycle power augmentation using inlet fogging.

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MAT, a novel, open cycle gas turbine for power augmentation

Cited by 29 publications

References 0 publications

Numerical Simulations on Droplet Coalescence in an L-shaped Duct for Inlet Fogging of Gas Turbine Engines

Numerical Simulations on Droplet Coalescence in an L-shaped Duct for Inlet Fogging of Gas Turbine Engines

Energy and exergy analyses of compressor inlet air-cooled gas turbines using the Joule—Brayton refrigeration cycle

Power Augmentation Study of a Combined Cycle Power Plant Using Inlet Fogging

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