Pressurized water heat storage and energy storage system as well as energy storage and energy release method

Abstract

The invention discloses a pressurized water heat storage and energy storage system as well as an energy storage and energy release method. According to the invention, water in a normal-temperature andnormal-pressure water storage tank is pressurized and stored into a high-temperature and high-pressure water storage tank through a booster pump unit after passing through a heater to form high-temperature and high-pressure water quality storage potential energy, and the booster pump unit and the heater are used for converting and storing energy in a load valley period or during waste heat enrichment, high-temperature and high-pressure gas is recycled by a high-pressure steam turbine; a reheater is used for heating, so that redundant steam is subjected to low-pressure steam turbine backflow recovery; energy recovery and cooling are carried out through a cooler to carry out secondary energy recovery; finally, a working medium is depressurized and stabilized through the water turbine for three-stage recovery; a closed-loop energy storage and release system is formed, only one high-temperature and high-pressure water storage tank is needed for energy storage, the structure is simple, thenormal-temperature and normal-pressure water storage tank is adopted for working medium storage, the requirement for geographical potential difference is avoided, high-temperature and high-pressure water and steam mixed storage is utilized, the operation efficiency is high, and the potential energy process recycling efficiency is high.

Description

technical field [0001] The invention relates to the technical field of physical energy storage, in particular to a pressurized water heat storage energy storage system and an energy storage and release method. Background technique [0002] In order to solve the problem of large-scale grid-connection of intermittent renewable energy and improve the efficiency, safety, and economy of grid operation, the development of large-scale electric energy storage technology has become the focus of common attention of domestic and foreign researchers. As a transitional technology of the power system, energy storage technology can store the electric energy generated by renewable energy when the power load is low, and then output it in a certain way when the energy is needed by the outside world, which can cut peaks and fill valleys for the power grid. It can effectively alleviate the instability of power load and improve the grid-connected utilization rate of renewable energy power genera...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a pressurized water heat storage energy storage system and energy storage and release method to overcome the problems of low operating efficiency and high requirements for water storage site selection in the prior art. The present invention can use water pumps and water turbines to achieve pressure The storage and release of potential energy can effectively avoid the irreversible loss of the system and improve the operating efficiency of the system

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