Novel liquid air energy storage system using phase change energy storage

Abstract

The invention relates to a novel liquid air energy storage system using phase change energy storage. The novel liquid air energy storage system has two working states including energy storage and energy releasing; in the energy storage process, a compressor unit is driven by a driving unit, and is sequentially connected with a heat accumulator set, a regenerator, a liquid expansion machine, a gas-liquid separator and a liquid air storage tank; and in the energy releasing process, a cryogenic pump is sequentially connected with the regenerator, a vaporizer, the heat accumulator set and a main expansion machine set, the main expansion machine set drives a power generator, the cryogenic pump is connected with the liquid air storage tank, winding pipe type heat exchangers are adopted in the heat accumulator set and the regenerator, a phase change heat storage material is contained in a shell pass, and an intermediate medium vaporizer is adopted as the vaporizer. According to the novel liquid air energy storage system, the winding pipe type heat exchangers and the intermediate medium vaporizer are applied to the liquid air energy storage system, air is led into a pipe pass to exchange heat with the phase change heat storage material and a phase change cold storage material in the shell side, compressed heat and liquid air cold are stored by the phase change heat storage material and the phase change cold storage material correspondingly, circulated utilization of the heat and the cold is guaranteed, and the efficiency of the system is improved.

Description

technical field [0001] The invention belongs to the field of energy storage, and in particular relates to a novel liquid air energy storage system utilizing phase change energy storage. Background technique [0002] In today's world, the demand for energy continues to increase, and the excessive dependence on fossil fuels will lead to serious environmental and climate problems. The development of new renewable energy and the improvement of the utilization rate of existing energy have become a topic of concern to scholars and scientists around the world. Wind energy and solar energy are the most competitive forms of new energy in terms of technology and cost, but they have intermittent and unstable power generation characteristics, so they must rely on energy storage technology to store their energy to improve their power output quality and increase power generation. economy and reliability. Existing electric energy storage technologies include pumped water storage, compress...

AI Technical Summary

Problems solved by technology

However, the energy storage density of compressed air energy storage technology is low, and the difficulty lies in the need for a suitable place to store compressed air. The underground salt cavern is the lowest-cost gas storage room in the compressed air energy storage system, and the salt cavern still needs to have sufficient depth. Underwater CAES is also being studied, but also requires a suitable water depth

If a large number of air storage tanks are used on the ground to store compressed high-pressure air, the construction cost will be greatly increased

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