南方能源建设 (Mar 2024)
An Energy Storage System with Binary Cycle Gas Compressionand Its Feasibility Analysis
Abstract
[Introduction] The compressed air energy storage system has a very large air storage volume and high pressure, and usually uses the underground salt cavern as the gas storehouse. Project development is constrained by scarce salt cavern resources. The compressed carbon dioxide energy storage system uses the storage tank with the atmospheric flexible gas film to store carbon dioxide gas. The gas film tank has a huge volume and occupies an excessive area, making it difficult to meet the requirements of construction land indicators of the industrial park. In order to achieve the widespread application of the energy storage with gas compression in industrial parks, an energy storage system with binary cycle gas compression is proposed. [Method] The system integrated the compressed air energy storage and compressed carbon dioxide energy storage systems, and utilized a shared gas storehouse. The gas storehouse adopted specially designed pressure vessels, which were divided into equal-pressure and scalable air chambers and carbon dioxide chambers using flexible membranes. The system could achieve the storage and release of energies through the collaborative work of compressed air circuits and compressed carbon dioxide circuits, while maintaining a constant-pressure operation in the gas storehouse. In order to evaluate the energy storage performance and energy storage density of the system, a preliminary thermodynamic calculation was conducted on the 100 MW/400 MWh energy storage system of the ground gas storehouse with a storage pressure of 3 MPa, followed by an analysis of the engineering feasibility. [Result] The results show that the energy storage efficiency of the system is 70.20% and energy density is 3.85 kWh/m3. The system is suitable for supporting energy storage in industrial parks and can provide the multi-generation function of electricity, gas, cooling and heating. Compared to electrochemical energy storage, it has significant commercial competitive advantages. [Conclusion] For energy storage scenarios in industrial parks, the energy storage with binary cycle gas compression has an important potential commercial value due to its flexible location selection, feasible technology, mature equipment, and controllable cost.
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