Abstract
In order to improve the heat storage and heat exchange system of advanced adiabatic compressed air energy storage (AA-CAES) system, an AA-CAES system with regenerative heat exchangers (RHEs) is studied. The RHE is used to replace the conventional complex units, including heat exchangers, high temperature tank, and low temperature tank mode. For the AA-CAES with RHEs, the energy storage system is simplified to reduce the heat loss in the heat exchange and storage processes, and thus, the output work, energy storage density, energy storage efficiency of the system are improved. The thermodynamic model is established and the influences of compression ratio distribution, expansion ratio distribution and ambient temperature on the system performance are investigated. The results show that for the AA-CAES with RHEs, when the ratio of compression ratios is 1.14, the input work of the compressor is the minimum, the energy storage efficiency is 66.42%, and the energy storage density is 3.61 kWh/m3. When the ratio of expansion ratios is 0.82, the energy storage efficiency reaches the maximum value of 67.38%, and the energy storage density reaches the maximum value of 3.66 kWh/m3.
Highlights
With the continuous development and utilization of renewable energy such as intermittent solar energy and wind energy, the stability of power grid is affected [1,2,3]
The total output work of the expander decreases with the increase in the ratio of compression ratios, but the change is not clear if the ratio of compression ratios is greater than 1
This is because the total output work of the two expanders is mainly related to the temperature and flow rate of the air flowing through the regenerative heat exchangers (RHEs)
Summary
With the continuous development and utilization of renewable energy such as intermittent solar energy and wind energy, the stability of power grid is affected [1,2,3]. Among the energy storage technologies, the compressed air energy storage (CAES) technology stands out for its large capacity, low cost, long service life, no geographical constraints and technology readiness level [5]. AA-CAES generally includes heat exchangers, high-temperature tank and low-temperature tank [6, 7]. The RHEs are used to replace the conventional heat exchangers, high temperature tank and low temperature tank, aiming at simplifying the system structure and improving the system performance
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