Abstract
A novel compressed air energy storage (CAES) system has been developed, which is innovatively integrated with a coal-fired power plant based on its feedwater heating system. In the hybrid design, the compression heat of the CAES system is transferred to the feedwater of the coal power plant, and the compressed air before the expanders is heated by the feedwater taken from the coal power plant. Furthermore, the exhaust air of the expanders is employed to warm partial feedwater of the coal power plant. Via the suggested integration, the thermal energy storage equipment for a regular CAES system can be eliminated and the performance of the CAES system can be improved. Based on a 350 MW supercritical coal power plant, the proposed concept was thermodynamically evaluated, and the results indicate that the round-trip efficiency and exergy efficiency of the new CAES system can reach 64.08% and 70.01%, respectively. Besides, a sensitivity analysis was conducted to examine the effects of ambient temperature, air storage pressure, expander inlet temperature, and coal power load on the performance of the CAES system. The above work proves that the novel design is efficient under various conditions, providing important insights into the development of CAES technology.
Highlights
The global energy demand is soaring and still mainly relies on fossil fuels, which has caused energy shortage and climate change, thereby it is necessary for the world’s energy policy to move rapidly towards renewable, efficient, and flexible energy systems [1]
This paper developed a conceptual compressed air energy storage (CAES) system organically integrated with a coal-fired power plant
Based on the concept to integrate the CAES system with the coal power plant, we examined several configurations and numerous specifications previously, and the most suitable configuration has been presented in the current paper
Summary
The global energy demand is soaring and still mainly relies on fossil fuels, which has caused energy shortage and climate change, thereby it is necessary for the world’s energy policy to move rapidly towards renewable, efficient, and flexible energy systems [1]. The exploitation of renewable energy sources may be limited by their uncertainties, probabilities, and fluctuating behaviors [3]. Fossil fuels can be utilized to offer energy following customers’ demands and they are readily storable when not required, some renewable energy sources (such as solar energy, wind energy, etc.) are supposed to be harvested when they are available and may be stored until they are needed [4]. Numerous researchers have been dedicated to energy storage technology due to its superiorities in reducing
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