Application Research of Intake-Air Cooling Technologies in Gas-Steam Combined Cycle Power Plants in China

Zhang, Tao; Liu, Zhitan; Hao, Hongliang; Chang, Lianchen

doi:10.4236/jpee.2014.24042

Cited by 15 publications

(4 citation statements)

References 4 publications

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“…Improving combustion engine operation efficiency by using cyclic air cooling in chillers using exhaust heat potential [1,2] is one of the most widespread energy-saving technologies in internal combustion engines [3,4], gas engines [5,6] and gas turbines [7,8]. Therefore, combustion engine cyclic air cooling as a whole, and turbine intake air cooling Energies 2023, 16, 6105 2 of 16 (TIAC) in particular, are kept as sustainable and prosperous trends for enhancing operation efficiency [9,10].…”

Section: Introductionmentioning

confidence: 99%

Increasing the Efficiency of Turbine Inlet Air Cooling in Climatic Conditions of China through Rational Designing—Part 1: A Case Study for Subtropical Climate: General Approaches and Criteria

Radchenko,

Yang,

Pavlenko

et al. 2023

Energies

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The enhancement of gas turbine (GT) efficiency through inlet air cooling, known as TIAC, in chillers using the heat of exhaust gas is one of the most attractive tendencies in energetics, particularly in thermal engineering. In reality, any combustion engine with cyclic air cooling using waste heat recovery chillers might be considered as a power plant with in-cycle trigeneration focused on enhancing a basic engine efficiency, which results in additional power output or fuel savings, reducing carbon emissions in all cases. The higher the fuel efficiency of the engine, the more efficient its functioning as a source of emissions. The sustainable operation of a GT at stabilized low intake air temperature is impossible without using rational design to determine the cooling capacity of the chiller and TIAC system as a whole to match current duties without overestimation. The most widespread absorption lithium-bromide chillers (ACh) are unable to reduce the GT intake air temperature below 15 °C in a simple cycle because the temperature of their chilled water is approximately 7 °C. Deeper cooling air would be possible by applying a boiling refrigerant as a coolant in ejector chiller (ECh) as the cheapest and simplest in design. However, the coefficients of performance (COP) of EChs are considerably lower than those of AChs: about 0.3 compared to 0.7 of AChs. Therefore, EChs are applied for subsequent cooling of air to less than 15 °C, whereas the efficient ACh is used for ambient air precooling to 15 °C. The application of an absorption–ejector chiller (AECh) enables deeper inlet air cooling and greater effects accordingly. However, the peculiarities of the subtropical climate, characterized by high temperature and humidity and thermal loads, require extended analyses to reveal the character of thermal load and to modify the methodology of designing TIAC systems. The advanced design methodology that can reveal and thereby forecast the peculiarities of the TIAC system’s thermal loading was developed to match those peculiarities and gain maximum effect without oversizing.

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Section: Introductionmentioning

confidence: 99%

Increasing the Efficiency of Turbine Inlet Air Cooling in Climatic Conditions of China through Rational Designing—Part 1: A Case Study for Subtropical Climate: General Approaches and Criteria

Radchenko,

Yang,

Pavlenko

et al. 2023

Energies

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“…13 A commonly used analysis involves calculations of the annual P CDH, while assigning an economic benefit to each CDH number in terms of fuel saved or engine output increased due to cooling. 14,15 This calculation gives the total annual fuel saving or additional power output that can be produced due to engine inlet air cooling 16,17 and takes into account the climatic performance characteristics of the engine applied.…”

Section: Introductionmentioning

confidence: 99%

A novel degree-hour method for rational design loading

Radchenko

Mikielewicz

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part A:

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Cooling degree-hours (CDH) received the broadest application in evaluation of the ambient air cooling efficiency in power engineering (engine intake air cooling systems) and air conditioning. The current CDH numbers are defined as a drop in air temperature multiplied by associated time duration of performance and their summarized annual number is used to estimate the annual effect achieved due to sucked air cooling in power plants based on combustion engines (fuel saving, power output increment) and in air conditioning (refrigeration energy generation according to needs). A majority of approaches to designing ambient air cooling systems is proceeding from the cooling capacity of the chillers selected to provide a maximum current or annual CDH number with corresponding maximum current or annual effect (additional energy produced or fuel consumption reduction) in site climate location. But such approaches lead to inevitable oversizing the chillers and cooling systems in the whole. The analysis of intake air cooling efficiency in site varying climatic conditions, accompanied by quite a simple numerical simulation, enabled to reveal the potential of its enhancement and evaluate numerically the results of each step of designing in logical sequence. The new approaches to cooling system rational designing were introduced, that enables to synthesize and substantiate innovative principal decisions to exclude unproductive waste of installed (design) cooling capacity in actual operation. The innovative findings of methodological approaches include the use of the rate of annual CDH number increment as an indicator for selecting the optimum and rational values of design cooling capacity. The optimum cooling capacity corresponds to maximum rate of summarized annual CDH increment and maximum level of thermal loading accordingly, which provides minimum sizes of the chiller. In reality, it is a minimum permissible value of cooling capacity of the chiller installed and the overall ambient air cooling system. The rational cooling capacity, that enables to achieve practically maximum value of annual CDH and avoid chiller oversizing, is determined as the second, local, maximum of the rate in the summarized annual CDH over the range above the first one, global, maximum. A rational design cooling capacity determined by applying the novel methodology allows to decrease the ambient air cooling system sizes by 15 to 20% compared with traditional designing issuing from the peaked thermal load during a year. With this practically a maximum annual effect in fuel saving (energy generation or others) can be achieved too.

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“…Gas turbine combined cycle (GTCC) is an efficient way to generate electricity with a thermal efficiency of up to 55% or more and is considered as one of the best options to generate electricity from fossil energy sources in the coming decades. The unit operating efficiency and power output of gas turbines are largely influenced by the inlet air temperature [1], and for every 10°C increase in the inlet gas temperature, the specific fuel consumption will increase by 1.5% to 4% [2]. Therefore, the use of exhaust gas waste heat driven inlet cooling system is a promising and practical research direction.…”

Section: Introductionmentioning

confidence: 99%

Analysis of gas turbine inlet cooling system based on double-effect lithium bromide absorption chiller

2022

IJFET

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The study analyzes the theoretical gain of the gas turbine inlet cooling system using a single absorption double-effect lithium bromide chiller based on real climatic data and gas turbine technical parameters, and through rational logical analysis and calculations, using the annual fuel savings ΣB as the criteria. The calculation uses the technical parameters of UGT 10000 (NISO =10.5 MW) to derive the optimal design value and the corresponding gain of the intake air cooling system. The results show a fuel saving of 26,359.2 g per 1 kW power output of the unit in year-round operation, for a total annual fuel saving of 354.6 t.

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Application Research of Intake-Air Cooling Technologies in Gas-Steam Combined Cycle Power Plants in China

Cited by 15 publications

References 4 publications

Increasing the Efficiency of Turbine Inlet Air Cooling in Climatic Conditions of China through Rational Designing—Part 1: A Case Study for Subtropical Climate: General Approaches and Criteria

Increasing the Efficiency of Turbine Inlet Air Cooling in Climatic Conditions of China through Rational Designing—Part 1: A Case Study for Subtropical Climate: General Approaches and Criteria

A novel degree-hour method for rational design loading

Analysis of gas turbine inlet cooling system based on double-effect lithium bromide absorption chiller

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