Using coolant modulation and pre-cooling to avoid turbine blade overheating in a gas turbine combined cycle power plant fired with low calorific value gas

Kwon, Ik Hwan; Kang, Dong Won; Kim, Tong Seop

doi:10.1016/j.applthermaleng.2013.07.008

Cited by 16 publications

(3 citation statements)

References 21 publications

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“…Coefficient of performance (COP) is the ratio of refrigeration effect produced by the chiller against the amount of electrical energy required by the cooling machine to generate the cooling effect. It is a measure of efficiency and it is only being considered because the electrical energy required to operate the chiller is from the turbine itself (Kwon et al, 2013). When the coefficient of performance is higher (COP=8), it means that it requires less electrical energy from the turbine to cool the air to 8 o C compared to when COP is 5, or 2 accordingly.…”

Section: Mechanical Chiller Simulation Resultsmentioning

confidence: 99%

Efficiency Enhancement of Gas Turbine Power Output by Cooling Inlet Air

Salihu¹

2022

ijcsrr

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Electrical power generation can be achieved through many means, one of which includes using a gas turbine. Gas turbine performance is highly dependent on ambient temperature; as temperature increases gas turbine power output is lessened. This can be a huge problem in warmer regions like Nigeria. Gas turbines use the surrounding air to generate electricity and this gives rise to a method or curbing the effect of high ambient temperatures. Once the volumetric rate is constant as is the case in a gas turbine system, air density and ambient temperature are inversely proportional; this allows mass flow rate to be inversely proportional to temperature. To fully take advantage of this, there are many methods that can be implemented to achieve this cooling effect. A few of these methods were investigated in this study to determine their strengths and susceptibilities. The performance characteristics were scrutinised for a range of operational values including ambient temperature, humidity and air density. The results showed that air cooling significantly improved the power output of the gas turbine. At standard temperature of 32oc, the base case was 37.87 MW while evaporative cooler, mechanical and absorption chillers were 37.70 MW, 40.39 MW and 41.07 MW respectively.

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Section: Mechanical Chiller Simulation Resultsmentioning

confidence: 99%

Efficiency Enhancement of Gas Turbine Power Output by Cooling Inlet Air

Salihu¹

2022

ijcsrr

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“…However, there is no general criterion for defining the residue cost distribution ratios. Here, a simple method was adopted from the literature, in which the residue cost distribution ratios are proportional to the exergy of the flows processed in the dissipative units according to the production structure of the plant, that is where E j , r represents the exergy of the flow produced in the j th component that is processed (dissipated) in the r th component.…”

Section: Methodsmentioning

confidence: 99%

“…However, preventing the blades from overheating by decreasing the firing temperature will result in a significant reduction in the outlet power. Kwon et al 18 simulated the modulation of the coolant supply to each blade row while precooling the coolant to further enhance the power output. The results showed that blade cooling provides a higher system efficiency than under-firing and that pre-cooling recovers 80% of the available maximum augmentation of the combined cycle.…”

Section: Introductionmentioning

confidence: 99%

Exergy and Exergoeconomic Analyses of a Byproduct Gas-Based Combined Cycle Power Plant with Air Blade Cooling

Liu

Huo

et al. 2022

ACS Omega

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A combined cycle power plant (CCPP), which can use several kinds of byproduct gases as fuel, has attracted significant attention in the field of power generation due to their higher efficiency and lower environmental impact. Here, a simulation model of a 180 MW CCPP with air-film blade cooling was established using ASPEN HYSYS and analyzed from both exergy and exergoeconomic perspectives to evaluate the system performance in terms of exergy efficiencies and exergy destruction of the system and the economic costs of the process and analyze the effects of the system from different inlet air temperatures and ambient temperatures (15−15 model, 15−25 model, and 25−25 model). The production and residue cost distribution ratios were defined in the fuel and product table, which represents how the product of a given component is distributed among the other apparatuses, and whether it forms a final product or becomes a residue. The results show that the exergy efficiencies of the system are 48.69% (15−15), 48.32% (15−25), and 47.84% (25−25). The combustion chamber has the highest exergy destruction ratio among all components, and the turbine air cooler has the lowest exergy efficiency in the system. The unit exergoeconomic power cost of the CCPP is 0.0253 $/kW h (15−15), 0.0260 $/kW h (15−25), and 0.0266 $/kW h (25−25).

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