Simulation and analysis of different adiabatic Compressed Air Energy Storage plant configurations

Lee

et al. 2012

Entropy

142

Abstract:Energy storage systems are increasingly gaining importance with regard to their role in achieving load levelling, especially for matching intermittent sources of renewable energy with customer demand, as well as for storing excess nuclear or thermal power during the daily cycle. Compressed air energy storage (CAES), with its high reliability, economic feasibility, and low environmental impact, is a promising method for large-scale energy storage. Although there are only two large-scale CAES plants in existence, recently, a number of CAES projects have been initiated around the world, and some innovative concepts of CAES have been proposed. Existing CAES plants have some disadvantages such as energy loss due to dissipation of heat of compression, use of fossil fuels, and dependence on geological formations. This paper reviews the main drawbacks of the existing CAES systems and presents some innovative concepts of CAES, such as adiabatic CAES, isothermal CAES, micro-CAES combined with air-cycle heating and cooling, and constant-pressure CAES combined with pumped hydro storage that can address such problems and widen the scope of CAES applications, by energy and exergy analyses. These analyses greatly help us to understand the characteristics of each CAES system and compare different CAES systems. OPEN ACCESS

Section: Adiabatic Caes Systemmentioning

confidence: 99%

Section:  mentioning

confidence: 99%

Potential and Evolution of Compressed Air Energy Storage: Energy and Exergy Analyses

Lee

et al. 2012

Entropy

142

“…In such a concept, the heat absorbed by the intercoolers during the compression phase is stored in a thermal energy storage (TES) system and utilized during the discharge phase to heat the pressurized air. A-CAES systems can be classified into high temperature (400-800 • C) [3,4] and low temperature (80-200 • C) systems [5]. High temperature systems call for innovative compressors capable of operating at very high discharge temperatures.…”

Section: Introductionmentioning

confidence: 99%

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

Salvini

2018

Energies

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.

“…They both use a salt dome (cavern reservoir) as the air storage vessel. Thermodynamic and hydrodynamic studies of compressed air energy storage in caverns (CAESC) have been conducted to describe the pressure and temperature variances [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

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

Zhang

et al. 2017

Geofluids

With the blossoming of intermittent energy, compressed air energy storage (CAES) has attracted much attention as a potential largescale 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.