Exergy and Exergoeconomic Model of a Ground-Based CAES Plant for Peak-Load Energy Production

Buffa, Francesco; Kemble, Simon; Manfrida, Giampaolo; Milazzo, Adriano

doi:10.3390/en6021050

Cited by 36 publications

(13 citation statements)

References 9 publications

(15 reference statements)

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“…It is easy to see that the exergy destruction can demonstrate the entropy generation. It is common to conduct exergy analysis based on the second law of thermodynamics [23,24]. Therefore, to reveal the internal phenomena of the CAES-CC system, an exergy analysis is performed for the CAES-CC and reference CAES.…”

Section: System Analysis According To the Second Law Of Thermodynamicsmentioning

confidence: 99%

Analysis and Optimization of a Compressed Air Energy Storage—Combined Cycle System

Liu

Zhou

et al. 2014

Entropy

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Compressed air energy storage (CAES) is a commercial, utility-scale technology that provides long-duration energy storage with fast ramp rates and good part-load operation. It is a promising storage technology for balancing the large-scale penetration of renewable energies, such as wind and solar power, into electric grids. This study proposes a CAES-CC system, which is based on a conventional CAES combined with a steam turbine cycle by waste heat boiler. Simulation and thermodynamic analysis are carried out on the proposed CAES-CC system. The electricity and heating rates of the proposed CAES-CC system are lower than those of the conventional CAES by 0.127 kWh/kWh and 0.338 kWh/kWh, respectively, because the CAES-CC system recycles high-temperature turbine-exhausting air. The overall efficiency of the CAES-CC system is improved by approximately 10% compared with that of the conventional CAES. In the CAES-CC system, compressing intercooler heat can keep the steam turbine on hot standby, thus improving the flexibility of CAES-CC. This study brought about a new method for improving the efficiency of CAES and provided new thoughts for integrating CAES with other electricity-generating modes. OPEN ACCESSEntropy 2014, 16 3104

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Section: System Analysis According To the Second Law Of Thermodynamicsmentioning

confidence: 99%

Analysis and Optimization of a Compressed Air Energy Storage—Combined Cycle System

Liu

Zhou

et al. 2014

Entropy

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“…To determine the internal phenomena of the hybrid-fuel CAES system, exergy analysis is conducted [36]. The general exergy balance of each component of the CAES system can be expressed by the following rate form:…”

Section: Exergy Analysismentioning

confidence: 99%

A Novel Hybrid-Fuel Storage System of Compressed Air Energy for China

Liu

et al. 2014

Energies

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Compressed air energy storage (CAES) is a large-scale technology that provides long-duration energy storage. It is promising for balancing the large-scale penetration of intermittent and dispersed sources of power, such as wind and solar power, into electric grids. The existing CAES plants utilize natural gas (NG) as fuel. However, China is rich in coal but is deficient in NG; therefore, a hybrid-fuel CAES is proposed and analyzed in this study. Based on the existing CAES plants, the hybrid-fuel CAES incorporates an external combustion heater into the power generation subsystem to heat the air from the recuperator and the air from the high-pressure air turbine. Coal is the fuel for the external combustion heater. The overall efficiency and exergy efficiency of the hybrid-fuel CAES are 61.18% and 59.84%, respectively. Given the same parameters, the cost of electricity (COE) of the hybrid-fuel CAES, which requires less NG, is $5.48/MW•h less than that of the gas-fuel CAES. Although the proposed CAES requires a relatively high investment in the current electricity system in North China, the proposed CAES will be likely to become competitive in the market, provided that the energy supplies are improved and the large scale grid-connection of wind power is realized.

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“…Figure 2b gives the actual steam section power output in comparison with that calculated by assuming w EL,ST = w * EL,ST , i.e., neglecting the steam section off-design operation improvements. The distance between curves at the same abscissa gives a measure of the term in square brackets in Equation (6). It can be noticed that, by reducing the gas mass flow entering the HRSG, such a difference can represent a significant percentage of the actual power output.…”

Section: Gas-steam Combined Cyclementioning

confidence: 99%

“…The second term expresses the work done by the N − 1 following stages, where air enters at temperature T OUT , according to assumption (5). β i represents the stage pressure ratio: according to assumption (6), at each instant all stages operate at the same pressure ratio β S (t) = N β (t) and, therefore, Equation (9) can be re-written as follows:…”

Section: Caes Compression and Storage Systemmentioning

confidence: 99%

“…Low temperature A-CAES systems are not affected by the above issues. However, the huge number of compression and expansion stages needed to reach a satisfactory performance level represents a major drawback [6]. Such complex compression and expansion trains eventually entail relevant investment costs and complications in controlling plant operation.…”

Section: Introductionmentioning

confidence: 99%

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CAES Systems Integrated into a Gas-Steam Combined Plant: Design Point Performance Assessment

Salvini

2018

Energies

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Abstract:In the present paper, the performance of an energy storage concept based on the integration of a compressed air energy storage (CAES) system into a gas-steam combined cycle (GSCC) plant is investigated. CAES systems featured by different design specifications have been coupled with a commercially available small size GSCC plant. Storage efficiencies up to 65% have been evaluated for CAES design power output ranging from 5 to 10 MW. A techno-economic analysis aimed at assessing plant performance and investment costs has been performed. Despite the relatively high investment costs and the storage efficiency being less than those featuring alternative storage approaches, the proposed system may be considered of interest due to the long-life duration and the established technologies available for the key plant components.

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Exergy and Exergoeconomic Model of a Ground-Based CAES Plant for Peak-Load Energy Production

Cited by 36 publications

References 9 publications

Analysis and Optimization of a Compressed Air Energy Storage—Combined Cycle System

Analysis and Optimization of a Compressed Air Energy Storage—Combined Cycle System

A Novel Hybrid-Fuel Storage System of Compressed Air Energy for China

CAES Systems Integrated into a Gas-Steam Combined Plant: Design Point Performance Assessment

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