Thermodynamics analysis of a combined cooling, heating and power system integrating compressed air energy storage and gas-steam combined cycle

He, Xin; Li, Chengchen; Wang, Huanran

doi:10.1016/j.energy.2022.125105

Cited by 26 publications

(5 citation statements)

References 36 publications

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“…Constraints given by Equations ( 22) and ( 23) ensure that the plant gross power production and natural gas consumption remain bounded between values corresponding to 25% to 100% load. To keep the plant as an independent system on a year-to-year basis, the initial air storage density is used as a decision variable which is then constrained to be the same as that at the end of the year to ensure that the net change in the inventory over the entire year remains zero-this constraint is given by Equation (24). Moreover, since air extraction, air injection, and idling should be mutually exclusive at any given time instant, Equation ( 25) is used as a constraint, where small is a small positive number.…”

Section: Npv Optimization Formulationmentioning

confidence: 99%

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Techno-Economic Analysis and Optimization of a Compressed-Air Energy Storage System Integrated with a Natural Gas Combined-Cycle Plant

et al. 2023

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To address the rising electricity demand and greenhouse gas concentration in the environment, considerable effort is being carried out across the globe on installing and operating renewable energy sources. However, the renewable energy production is affected by diurnal and seasonal variability. To ensure that the electric grid remains reliable and resilient even for the high penetration of renewables into the grid, various types of energy storage systems are being investigated. In this paper, a compressed-air energy storage (CAES) system integrated with a natural gas combined-cycle (NGCC) power plant is investigated where air is extracted from the gas turbine compressor or injected back into the gas turbine combustor when it is optimal to do so. First-principles dynamic models of the NGCC plant and CAES are developed along with the development of an economic model. The dynamic optimization of the integrated system is undertaken in the Python/Pyomo platform for maximizing the net present value (NPV). NPV optimization is undertaken for 14 regions/cases considering year-long locational marginal price (LMP) data with a 1 h interval. Design variables such as the storage capacity and storage pressure, as well as the operating variables such as the power plant load, air injection rate, and air extraction rate, are optimized. Results show that the integrated CAES system has a higher NPV than the NGCC-only system for all 14 regions, thus indicating the potential deployment of the integrated system under the assumption of the availability of caverns in close proximity to the NGCC plant. The levelized cost of storage is found to be in the range of 136–145 $/MWh. Roundtrip efficiency is found to be between 74.6–82.5%. A sensitivity study with respect to LMP shows that the LMP profile has a significant impact on the extent of air injection/extraction while capital expenditure reduction has a negligible effect.

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Section: Npv Optimization Formulationmentioning

confidence: 99%

“…Salvini [23] has evaluated the thermal integration of HRSGs integrated with the CAES. He et al [24] have studied the thermodynamics of CAES with NGCC and have proposed to use the compression heat from the CAES system for the cracking reaction of methanol, thus avoiding thermal energy storage.…”

Section: Introductionmentioning

confidence: 99%

Techno-Economic Analysis and Optimization of a Compressed-Air Energy Storage System Integrated with a Natural Gas Combined-Cycle Plant

et al. 2023

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“…6 Based on the management method of the compression heat, CAES technology is classified into different types, namely diabatic compressed air energy storage (D-CAES), adiabatic compressed air energy storage (A-CAES), and isothermal compressed air energy storage (I-CAES). 7,8 In D-CAES, the compression heat is released instead of being stored, while fossil fuels are burnt to provide thermal energy for the air in the discharging process. Compared to D-CAES, the compression heat is stored and reused to replace the utilization of fossil fuels in A-CAES.…”

Section: Introductionmentioning

confidence: 99%

“…The two CAES plants that have been in commercial operation are the Huntorf plant built in Germany in 1978 and the McIntosh plant built in the United States in 1991 6 . Based on the management method of the compression heat, CAES technology is classified into different types, namely diabatic compressed air energy storage (D‐CAES), adiabatic compressed air energy storage (A‐CAES), and isothermal compressed air energy storage (I‐CAES) 7,8 . In D‐CAES, the compression heat is released instead of being stored, while fossil fuels are burnt to provide thermal energy for the air in the discharging process.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic investigation of variable‐speed compression unit in near‐isothermal compressed air energy storage

Wang

Sun

et al. 2023

Energy Storage

Self Cite

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Isothermal compression is the state‐of‐the‐art in compressed air energy storage (CAES) technology. The study of cyclic pressurization unit in isothermal CAES is carried out in this paper. The unit can continuously compress air utilizing double vessels operating alternately. In each vessel, the large heat capacity of water and spray cooling is applied to establish a conducive environment for the air achieving the effect of efficient near‐isothermal compression. The operating mode of the cyclic pressurization unit is divided into sliding‐pressure operation and constant‐pressure operation according to the pressure of its outlet. By adopting the characteristic curves of pump, the dynamic model is built for the unit in this paper. Further, the differences between the cyclic pressurization unit in isentropic process and in variable‐speed process are quantified and compared in four different cases. In isentropic process, the energy‐saving ratio and exergy efficiency of the unit are expected to reach 20.4% and 95.0%, respectively. In variable‐speed process, the energy‐saving ratio and efficiency of the unit can achieve 7.3% and 73.4%, respectively. This gap is mainly determined by the off‐design performance of the pump. Moreover, the vessel volume should be no less than 3 m3 and 5 m3 when there is spraying and when there is no spraying. Furthermore, spraying favors the improvement of the worsened compression performance caused by the change of design parameters. The energy‐saving ratio can be improved via spraying by 1.3% to 11.0% and 1.8% to 25.6% in the isentropic and variable‐speed processes, respectively. Meanwhile, the exergy efficiency can be increased by 1.5% to 9.4% in the isentropic process and 1.4% to 8.4% in the variable‐speed by spraying.

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“…Therefore, the issue of how to reduce carbon emissions has attracted widespread attention from national and international scholars [7][8][9][10][11]. As a high−efficiency energy supply system close to the end−users, a combined cooling, heating, and power system can significantly improve the energy utilization efficiency, reduce energy loss, complete the energy utilization on a large scale, and finally deliver the three kinds of loads of cooling, heating, and power to the end−users with less pollution, high stability, safety, and reliability [12][13][14]. Although combined cooling, heating, and power systems have been demonstrated and applied in many places, how to realize a natural gas combined cooling, heating, and power supply to meet the financial requirements in cold regions where the heating demand of low−grade heat energy reaches 50% is still a hot research issue in the industry and an urgent problem to be solved.…”

Section: Introductionmentioning

confidence: 99%

Modeling and Optimization of Natural Gas CCHP System in the Severe Cold Region

Song,

Sun,

Zhang

et al. 2023

Energies

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A natural gas combined cooling, heating, and power (CCHP) system is a typical integrated energy supply method that optimizes end−use energy. However, how to achieve economically feasible natural gas CCHP in severe cold regions with low−grade heat demand reaching 50% is still a pressing issue. This paper establishes a typical natural gas CCHP system model for severe cold regions and conducts the system. Based on the climate conditions of Harbin, the economic optimization of independent gas turbine systems, internal combustion engines, and gas turbine systems is still a pressing issue. Based on the climate conditions of Harbin, the economic optimization of independent gas turbine systems, internal combustion engine systems, and steam boiler systems under different cooling and heating load ratios was carried out. The combination of “internal combustion engine + steam boiler” has the most optimal cost of RMB 1.766 million (USD 0.255 million), saving 10.7%, 7.8%, and 18.3% compared to the three single equipment subsystems respectively. This provides good theoretical support for the construction of multi−energy heterogeneous energy systems.

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Thermodynamics analysis of a combined cooling, heating and power system integrating compressed air energy storage and gas-steam combined cycle

Cited by 26 publications

References 36 publications

Techno-Economic Analysis and Optimization of a Compressed-Air Energy Storage System Integrated with a Natural Gas Combined-Cycle Plant

Techno-Economic Analysis and Optimization of a Compressed-Air Energy Storage System Integrated with a Natural Gas Combined-Cycle Plant

Thermodynamic investigation of variable‐speed compression unit in near‐isothermal compressed air energy storage

Modeling and Optimization of Natural Gas CCHP System in the Severe Cold Region

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