Heat pump type energy storage and combined cooling heating and power system based on Brayton cycle

Abstract

The invention provides a heat pump type energy storage and combined cooling heating and power system based on Brayton cycle. The system comprises a motor, a generator, a high-temperature compressor, alow-temperature compressor, a high-temperature expander, a low-temperature expander, a heat storage device, a cold storage device, an external heat exchanger, a heat regenerator and a buffer chamber,wherein the motor provides energy to the high-temperature compressor in the energy storage process; the generator converts expansion work of the high-temperature expander in the energy release process to electric energy; the compressors, the heat storage device, the expanders and the cold storage device are connected in sequence in a closed loop manner; the heat regenerator is arranged between the heat exchanger and the compressors or between the heat exchanger and the expanders; and the heat exchanger is connected with the heat regenerator and the cold storage device or the heat regeneratorand the heat storage device. The system stores and uses heat energy and cold energy in the energy storage and release process through a shell-and-tube or accumulation bed type step phase change heat storage device and the cold storage device, realizes combined cooling heating and power, improves the energy storage density, and can further provide the heat energy and the cold energy with differentgrades to users to satisfy different energy demands.

Description

technical field [0001] The invention relates to a technology in the field of energy storage, in particular to a Brayton cycle-based heat pump energy storage and combined cooling, heating and power supply system. Background technique [0002] Existing large-scale energy storage technologies mainly include pumped hydro storage, compressed air energy storage, and flow battery energy storage. The construction period of pumped hydro storage and compressed air energy storage is long, has a great impact on the environment, and is limited by geographical and geological conditions. However, flow battery energy storage faces the problems of insufficient service life and high cost. The heat pump power storage system can make up for the shortcomings and deficiencies of the above-mentioned large-scale energy storage technologies, among which the heat pump power storage system based on the Brayton cycle is an important technical branch. At present, the heat pump power storage system bas...

AI Technical Summary

Problems solved by technology

At present, the heat pump power storage system based on the Brayton cycle is still limited to complete the storage and release of electric energy, and cannot realize the combined cooling, heating and power supply, and cannot meet the user's demand for diversified energy sources.

In addition, the heat pump power storage system based on the Brayton cycle still uses stacked bed single-stage sensible heat storage tanks and cold storage tanks, which has low energy storage density and cannot provide users with multi-grade heat and cold energy.

[0003] The existing heat storage and cold storage devices are all single-stage stacked bed heat storage and cold storage devices using sensible heat materials. supply of cold energy

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