Achieving Quasi-Isothermal Air Compression With Multistage Compressors for Large-Scale Energy Storage

2013 ◽  
Author(s):  
Kai Wang ◽  
Peiwen Li ◽  
Ara Arabyan
Keyword(s):  
Energy Storage ◽  
Compression Ratio ◽  
Large Scale ◽  
High Efficiency ◽  
Pressure Ratio ◽  
Compressed Air ◽  
Thermal Source ◽  
Round Trip ◽  
Compression Process ◽  
Compression Scheme

The round trip efficiency of compressed air for energy storage is greatly limited by the significant increase in the temperature of the compressed air (and the resulting heat loss) in high-ratio adiabatic compression. This paper introduces a multi-stage compression scheme with low-compression-ratio compressors and inter-compressor natural convection cooling resulting in a quasi-isothermal compression process that can be useful for large-scale energy storage. When many low pressure ratio compressors work inline, a high overall compression ratio can be achieved with high efficiency. The quasi-isothermally compressed air can then be expanded adiabatically in turbines to generate power with the addition of thermal energy, from either fuel or a solar thermal source. This paper presents mathematical models of such an energy storage system and discusses its round-trip performance with different operating schemes.

scholarly journals Effects of piston speed, compression ratio and cylinder geometry on system performance of a liquid piston

2016 ◽  
Vol 20 (6) ◽  
pp. 1953-1961 ◽  
Author(s):  
Mustafa Mutlu ◽  
Muhsin Kiliç
Keyword(s):  
Energy Storage ◽  
Compression Ratio ◽  
System Performance ◽  
Large Scale ◽  
Renewable Energy Sources ◽  
Compression Process ◽  
Compression Efficiency ◽  
Piston Speed ◽  
The World ◽  
Liquid Piston

Energy storage systems are being more important to compensate irregularities of renewable energy sources and yields more profitable to invest. Compressed air energy storage (CAES) systems provide sufficient of system usability, then large scale plants are found around the world. The compression process is the most critical part of these systems and different designs must be developed to improve efficiency such as liquid piston. In this study, a liquid piston is analyzed with CFD tools to look into the effect of piston speed, compression ratio and cylinder geometry on compression efficiency and required work. It is found that, increasing piston speeds do not affect the piston work but efficiency decreases. Piston work remains constant at higher than 0.05 m/s piston speeds but the efficiency decreases from 90.9 % to 74.6 %. Using variable piston speeds has not a significant improvement on the system performance. It is seen that, the effect of compression ratio is increasing with high piston speeds. The required power, when the compression ratio is 80, is 2.39 times greater than the power when the compression ratio is 5 at 0.01 m/s piston speed and 2.87 times greater at 0.15 m/s. Cylinder geometry is also very important because, efficiency, power and work alter by L/D, D and cylinder volume respectively.

scholarly journals Preliminary prospects of a Carnot-battery based on a supercritical CO2 Brayton cycle

2021 ◽  
Vol 61 (5) ◽  
pp. 644-660
Author(s):  
Karin Rindt ◽  
František Hrdlička ◽  
Václav Novotný
Keyword(s):  
Energy Storage ◽  
Supercritical Co2 ◽  
High Efficiency ◽  
Storage Systems ◽  
Renewable Energy Sources ◽  
Pressure Ratio ◽  
Working Fluid ◽  
Brayton Cycle ◽  
Round Trip ◽  
Weather Changes

As a part of the change towards a higher usage of renewable energy sources, which naturally deliver the energy intermittently, the need for energy storage systems is increasing. For the compensation of the disturbance in power production due to inter-day to seasonal weather changes, a long-term energy storage is required. In the spectrum of storage systems, one out of a few geographically independent possibilities is the use of heat to store electricity, so-called Carnot-batteries. This paper presents a Pumped Thermal Energy Storage (PTES) system based on a recuperated and recompressed supercritical CO2 Brayton cycle. It is analysed if this configuration of a Brayton cycle, which is most advantageous for supercritical CO2 Brayton cycles, can be favourably integrated into a Carnot-battery and if a similar high efficiency can be achieved, despite the constraints caused by the integration. The modelled PTES operates at a pressure ratio of 3 with a low nominal pressure of 8 MPa, in a temperature range between 16 °C and 513 °C. The modelled system provides a round-trip efficiency of 38.9 % and was designed for a maximum of 3.5 MW electric power output. The research shows that an acceptable round-trip efficiency can be achieved with a recuperated and recompressed Brayton Cycle employing supercritical CO2 as the working fluid. However, a higher efficiency would be expected to justify the complexity of the configuration.

scholarly journals A Solar–Thermal-Assisted Adiabatic Compressed Air Energy Storage System and Its Efficiency Analysis

2018 ◽  
Vol 8 (8) ◽  
pp. 1390 ◽  
Author(s):  
Xiaotao Chen ◽  
Tong Zhang ◽  
Xiaodai Xue ◽  
Laijun Chen ◽  
Qingsong Li ◽  
...  
Keyword(s):  
Energy Storage ◽  
Thermal Energy ◽  
High Efficiency ◽  
Exergy Efficiency ◽  
Compressed Air ◽  
Solar Thermal ◽  
Thermal Source ◽  
Compressed Air Energy Storage ◽  
Low Carbon ◽  
Solar Thermal Energy

Adiabatic compressed air energy storage (A-CAES) is an effective balancing technique for the integration of renewables and peak-shaving due to the large capacity, high efficiency, and low carbon use. Increasing the inlet air temperature of turbine and reducing the compressor power consumption are essential to improving the efficiency of A-CAES. This paper proposes a novel solar–thermal-assisted A-CAES system (ST-CAES), which features a higher inhale temperature of the turbine to improve the system efficiency. Solar–thermal energy, as an external thermal source, can alleviate the inadequate temperature of the thermal energy storage (TES), which is constrained by the temperature of the exhaust air of the compressor. Energy and exergy analyses were performed to identify ST-CAES performance, and the influence of key parameters on efficiency were studied. Furthermore, exergy efficiency and the destruction ratio of each component of ST-CAES were investigated. The results demonstrate that electricity storage efficiency, round-trip efficiency, and exergy efficiency can reach 70.2%, 61%, and 50%, respectively. Therefore, the proposed system has promising prospects in cities with abundant solar resources owing to its high efficiency and the ability to jointly supply multiple energy needs.

Large scale energy storage using multistage osmotic processes: approaching high efficiency and energy density

2017 ◽  
Vol 1 (3) ◽  
pp. 599-614 ◽  
Author(s):  
Devesh Bharadwaj ◽  
Henning Struchtrup
Keyword(s):  
Energy Storage ◽  
Energy Density ◽  
Large Scale ◽  
High Efficiency ◽  
Storage System ◽  
Energy Storage System ◽  
Single Stage ◽  
Round Trip

A large-scale energy storage system using multistage osmotic processes is analysed, wherein, the process designed shows promising round trip efficiency and energy density, relative to single stage processes.

scholarly journals Eco-Emission Analysis of Multi-Carrier Microgrid Integrated with Compressed Air and Power-to-Gas Energy Storage Technologies

2021 ◽  
Vol 13 (9) ◽  
pp. 4681
Author(s):  
Khashayar Hamedi ◽  
Shahrbanoo Sadeghi ◽  
Saeed Esfandi ◽  
Mahdi Azimian ◽  
Hessam Golmohamadi
Keyword(s):  
Energy Storage ◽  
Power Systems ◽  
High Efficiency ◽  
Objective Assessment ◽  
Energy Systems ◽  
Vital Role ◽  
Compressed Air ◽  
Emission Analysis ◽  
Multi Objective ◽  
Power To Gas

Growing concerns about global greenhouse gas emissions have led power systems to utilize clean and highly efficient resources. In the meantime, renewable energy plays a vital role in energy prospects worldwide. However, the random nature of these resources has increased the demand for energy storage systems. On the other hand, due to the higher efficiency of multi-energy systems compared to single-energy systems, the development of such systems, which are based on different types of energy carriers, will be more attractive for the utilities. Thus, this paper represents a multi-objective assessment for the operation of a multi-carrier microgrid (MCMG) in the presence of high-efficiency technologies comprising compressed air energy storage (CAES) and power-to-gas (P2G) systems. The objective of the model is to minimize the operation cost and environmental pollution. CAES has a simple-cycle mode operation besides the charging and discharging modes to provide more flexibility in the system. Furthermore, the demand response program is employed in the model to mitigate the peaks. The proposed system participates in both electricity and gas markets to supply the energy requirements. The weighted sum approach and fuzzy-based decision-making are employed to compromise the optimum solutions for conflicting objective functions. The multi-objective model is examined on a sample system, and the results for different cases are discussed. The results show that coupling CAES and P2G systems mitigate the wind power curtailment and minimize the cost and pollution up to 14.2% and 9.6%, respectively.

scholarly journals Thermodynamic Analysis of a Hybrid Trigenerative Compressed Air Energy Storage System with Solar Thermal Energy

Entropy ◽  
2020 ◽  
Vol 22 (7) ◽  
pp. 764
Author(s):  
Xiaotao Chen ◽  
Xiaodai Xue ◽  
Yang Si ◽  
Chengkui Liu ◽  
Laijun Chen ◽  
...  
Keyword(s):  
Energy Storage ◽  
Energy Demand ◽  
High Efficiency ◽  
Storage System ◽  
Energy Resource ◽  
Energy Storage System ◽  
Compressed Air ◽  
Critical Parameters ◽  
Compressed Air Energy Storage ◽  
Solar Thermal Energy

The comprehensive utilization technology of combined cooling, heating and power (CCHP) systems is the leading edge of renewable and sustainable energy research. In this paper, we propose a novel CCHP system based on a hybrid trigenerative compressed air energy storage system (HT-CAES), which can meet various forms of energy demand. A comprehensive thermodynamic model of the HT-CAES has been carried out, and a thermodynamic performance analysis with energy and exergy methods has been done. Furthermore, a sensitivity analysis and assessment capacity for CHP is investigated by the critical parameters effected on the performance of the HT-CAES. The results indicate that round-trip efficiency, electricity storage efficiency, and exergy efficiency can reach 73%, 53.6%, and 50.6%, respectively. Therefore, the system proposed in this paper has high efficiency and flexibility to jointly supply multiple energy to meet demands, so it has broad prospects in regions with abundant solar energy resource.

scholarly journals Numerical Investigation of the Influences of Wellbore Flow on Compressed Air Energy Storage in Aquifers

Geofluids ◽  
2017 ◽  
Vol 2017 ◽  
pp. 1-14 ◽  
Author(s):  
Yi Li ◽  
Keni Zhang ◽  
Litang Hu ◽  
Jinsheng Wang
Keyword(s):  
Energy Storage ◽  
Large Scale ◽  
Compressed Air ◽  
Energy Transfer Mechanism ◽  
Compressed Air Energy Storage ◽  
Screen Length ◽  
Aquifer Systems ◽  
Wide Availability ◽  
Reservoir Simulator ◽  
The Impact

With the blossoming of intermittent energy, compressed air energy storage (CAES) has attracted much attention as a potential large-scale energy storage technology. Compared with caverns as storage vessels, compressed air energy storage in aquifers (CAESA) has the advantages of wide availability and lower costs. The wellbore can play an important role as the energy transfer mechanism between the surroundings and the air in CAESA system. In this paper, we investigated the influences of the well screen length on CAESA system performance using an integrated wellbore-reservoir simulator (T2WELL/EOS3). The results showed that the well screen length can affect the distribution of the initial gas bubble and that a system with a fully penetrating wellbore can obtain acceptably stable pressurized air and better energy efficiencies. Subsequently, we investigated the impact of the energy storage scale and the target aquifer depth on the performance of a CAESA system using a fully penetrating wellbore. The simulation results demonstrated that larger energy storage scales exhibit better performances of CAESA systems. In addition, deeper target aquifer systems, which could decrease the energy loss by larger storage density and higher temperature in surrounding formation, can obtain better energy efficiencies.

Study on Optimization of Pressure Ratio Distribution in Multistage Compressed Air Energy Storage System

2018 ◽  
Author(s):  
Shang Chen ◽  
Tong Zhu ◽  
Huayu Zhang
Keyword(s):  
Energy Efficiency ◽  
Energy Storage ◽  
Pressure Ratio ◽  
Storage System ◽  
System Optimization ◽  
Energy Storage System ◽  
Compressed Air ◽  
System Efficiency ◽  
Compressed Air Energy Storage ◽  
Ratio Distribution

Compressed air energy storage is an effective energy storage technology to solve the instability of wind power in distributed energy resources. In this paper, a multistage compressed air energy storage system optimization model is constructed based on the energy conservation equation. Then the system is optimized by differential evolution to improve the system efficiency. Optimal pressure ratios are proposed to distribute the pressures of compressors and expanders. The impact of pressure ratio distribution curve on the system energy efficiency suggests that the change curve of the characteristics vary in different heat exchanger performance. Results show that the change of thermal transfer reactor performance leads to the variety of optimal distribution pressure ratio and energy efficiency of the system. In addition, the differential ratio distribution factor can be effective on the pressure ratio of reasonable allocation. System efficiency optimization results increased by about 1% compared mean value.

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