scholarly journals Thermal System Analysis and Optimization of Large-Scale Compressed Air Energy Storage (CAES)

Energies ◽  
2015 ◽  
Vol 8 (8) ◽  
pp. 8873-8886 ◽  
Author(s):  
Zhongguang Fu ◽  
Ke Lu ◽  
Yiming Zhu
Keyword(s):  
Energy Storage ◽  
Large Scale ◽  
System Analysis ◽  
Compressed Air ◽  
Thermal System ◽  
Compressed Air Energy Storage

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.

scholarly journals Design of a New Compressed Air Energy Storage System with Constant Gas Pressure and Temperature for Application in Coal Mine Roadways

Energies ◽  
2019 ◽  
Vol 12 (21) ◽  
pp. 4188 ◽  
Author(s):  
Kangyu Deng ◽  
Kai Zhang ◽  
Xinran Xue ◽  
Hui Zhou
Keyword(s):  
Renewable Energy ◽  
Energy Storage ◽  
Large Scale ◽  
Storage System ◽  
Coal Mines ◽  
Energy Storage System ◽  
Compressed Air ◽  
Compressed Air Energy Storage ◽  
Generation Capacity ◽  
Instability Energy

Renewable energy (wind and solar power, etc.) are developing rapidly around the world. However, compared to traditional power (coal or hydro), renewable energy has the drawbacks of intermittence and instability. Energy storage is the key to solving the above problems. The present study focuses on the compressed air energy storage (CAES) system, which is one of the large-scale energy storage methods. As a lot of underground coal mines are going to be closed in China in the coming years, a novel CAES system is proposed for application in roadways of the closing coal mines. The new system combines pumped-hydro and compressed-air methods, and features constant air pressure and temperature. Another specific character of the system is the usage of flexible bags to store the compressed air, which can effectively reduce air leakage. The governing equations of the system are derived, and the response of the system is analyzed. According to the equations, for a roadway with depth of 500 m and volume of 10,000 cubic meters, the power generation capacity of the CAES system is approximately 18 MW and the generating time is 1.76 h. The results show that the new CAES system proposed is reasonable, and provides a suitable way to utilize the underground space of coal mines.

Concept and Application of Distributed Compressed Air Energy Storage Systems Integrated in Utility Networks

2013 ◽  
Author(s):  
Miroslav P. Petrov ◽  
Reza Arghandeh ◽  
Robert Broadwater
Keyword(s):  
Renewable Energy ◽  
Energy Storage ◽  
Large Scale ◽  
Renewable Energy Sources ◽  
Compressed Air ◽  
Small Scale ◽  
Compressed Air Energy Storage ◽  
Distributed Energy ◽  
Local Networks ◽  
Distributed Energy Storage

Distributed energy storage has been recognized as a valuable and often indispensable complement to small-scale power generation based on renewable energy sources. Small-scale energy storage positioned at the demand side would open the possibility for enhanced predictability of power output and easier integration of small-scale intermittent generators into functioning electricity markets, as well as offering inherent peak shaving abilities for mitigating contingencies and blackouts, for reducing transmission losses in local networks, profit optimization and generally allowing tighter utility control on renewable energy generation. Distributed energy storage at affordable costs and of low environmental footprint is a necessary prerequisite for the wider deployment of renewable energy and its deeper penetration into local networks. Thermodynamic energy storage in the form of compressed air is an alternative to electrochemical energy storage in batteries and has been evaluated in various studies and tested commercially on a large scale. Distributed compressed air energy storage (DCAES) systems in combination with renewable energy generators installed at residential homes, public or commercial buildings are a viable alternative to large-scale energy storage, moreover promising lower specific investment than batteries if a mass-market is established. Flexible control methods can be applied to DCAES units, resulting in a complex system running either independently for home power supply, or as a unified and centrally controlled utility-scale energy storage entity. This study aims at conceptualizing the plausible distributed compressed-air energy storage units, examining the feasibility for their practical implementation and analyzing their behavior, as well as devising the possible control strategies for optimal utilization of grid-integrated renewable energy sources at small scales. Results show that overall energy storage efficiency of around 70% can be achieved with comparatively simple solutions, offering less technical challenges and lower specific costs than comparable electrical battery systems. Furthermore, smart load management for improving the dispatchability can bring additional benefits by profit optimization and decrease the payback time substantially.

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