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.

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

2019 ◽  
Vol 141 (6) ◽  
Author(s):  
Shang Chen ◽  
Tong Zhu ◽  
Huayu Zhang
Keyword(s):  
Energy Storage ◽  
Heat Exchangers ◽  
Pressure Ratio ◽  
Storage System ◽  
Optimization Method ◽  
Energy Storage System ◽  
Compressed Air ◽  
Design System ◽  
Compressed Air Energy Storage ◽  
Ratio Distribution

In this study, the round trip efficiency of a multistage adiabatic compressed air energy storage (A-CAES) system was optimized by differential evolution (DE) algorithm, and decision variables were the pressure ratio of each compressor/expander. The variation of the pressure ratio of each compressor/expander leads to different inlet air temperatures of the heat exchanger. Thus, this optimization method provides more heat energy recovery from compression to increase the inlet air temperature of expanders. Results indicate that the optimization method is effective for the pressure ratio allocation, improving the system efficiency by ∼1% and exergy efficiency of the heat storage process by 5.3% to the maximum compared with an equal pressure ratio distribution A-CAES system. Besides, a uniformity factor of temperature difference (UFTD) of multistage heat exchangers is proposed to analyze the temperature uniformity of the multistage heat exchangers, which indicates that decreasing the UFTD contributes to an increased uniformity of the temperature field and an improvement in heat transfer efficiency. The study is extended onto optimal off-design system configuration and the recommendations are proposed, which provides a guidance for A-CAES system design.

scholarly journals Analysis and Optimization of a Compressed Air Energy Storage System in Aquifer

1986 ◽  
Author(s):  
Peter Vadasz ◽  
Dan Weiner
Keyword(s):  
Energy Storage ◽  
Planning Process ◽  
Pressure Ratio ◽  
Storage System ◽  
Target Function ◽  
Energy Storage System ◽  
Compressed Air ◽  
Maximum Temperature ◽  
Compressed Air Energy Storage ◽  
Net Benefit

This paper discusses the thermo-economic analysis and optimization of a constant pressure Compressed Air Energy Storage system, in aquifer, subjected to an exogenous, periodic electricity price function of the interconnection. The target function considered is the net benefit of the plant. It is related to the fundamental planning parameters of the system like the compressor pressure ratio, the maximum temperature ratio, the charging-discharging duration ratio and the plant capacity factor. The results of the analysis permit to obtain the optimal values of the fundamental parameters to be used in the planning process.

Experimental investigation of a liquid turbine in a full performance test rig

2018 ◽  
Vol 233 (3) ◽  
pp. 337-345 ◽  
Author(s):  
Hongyang Li ◽  
Xuehui Zhang ◽  
Wen Li ◽  
Yangli Zhu ◽  
Zhitao Zuo ◽  
...  
Keyword(s):  
Energy Storage ◽  
Performance Test ◽  
Storage System ◽  
Energy Storage System ◽  
Experimental Results ◽  
Compressed Air ◽  
System Efficiency ◽  
Compressed Air Energy Storage ◽  
Test Rig ◽  
Industrial Systems

In traditional industrial systems, a liquid expander can be used as a substitute for a throttling valve to improve system efficiency and economy. In this paper, the research and development of liquid expanders was reviewed. A set of experimental procedures were presented and an experimental test rig was built to examine the performance of a liquid turbine, which is a model machine of the liquid expander used in the supercritical compressed air energy storage system. At the rated condition, the flow rate of the liquid turbine is 60.7 kg/s, the differential pressure is 0.662 MPa, the output power is 30.44 kW, and the efficiency is 75.16%. The experimental results indicate successful construction of the test rig, which fully demonstrates the advantages of a semi-open and semi-closed system. The experimental results of the liquid turbine are of practical value for verification and development of the liquid expander in supercritical compressed air energy storage system.

Numerical study on wet compression in a supercritical air centrifugal compressor

2019 ◽  
Vol 234 (3) ◽  
pp. 384-397
Author(s):  
Jianting Sun ◽  
Hucan Hou ◽  
Zhitao Zuo ◽  
Hongtao Tang ◽  
Haisheng Chen
Keyword(s):  
Energy Storage ◽  
Pressure Ratio ◽  
Storage System ◽  
Water Injection ◽  
Energy Storage System ◽  
Compressed Air ◽  
Specific Work ◽  
Compressed Air Energy Storage ◽  
Wet Compression ◽  
Injection Ratio

Wet compression is widely used to reduce compression work and improve efficiency in gas turbines. However, wet compression has not been industrially applied in the compressed air energy storage system (only few studies on isothermal compressed air energy storage system exist), which has an urgent demand to reduce the compression work. The high-pressure section of the compressed air energy storage system usually contains supercritical air, and the influence of supercritical wet compression is not yet clear. Thus, in this study, supercritical wet compression was numerically investigated in a centrifugal compressor used for the compressed air energy storage system, and its effects on performance and internal flow were also studied. The results show that the ideal maximum evaporation of water droplets in supercritical air is very low, which limits the maximum available water injection ratio; however, wet compression still has some benefits, such as increasing the total pressure ratio and isentropic efficiency and reducing the compression specific work. Moreover, wet compression reduces the diffuser loss but raises the wake loss in the impeller at the near-stall point. For this compressor, the optimum water injection ratio is 0.3%, which reduces the specific work by 0.65% at the designed pressure ratio.

Sign in / Sign up

Export Citation Format

Share Document