A pressurized water heat storage system and method for storing energy and releasing energy

Abstract

The invention discloses a pressurized water heat storage energy storage system and an energy storage and energy release method. The water in the normal temperature and pressure water storage tank is pressurized and stored in the high temperature and high pressure water storage tank through a booster pump unit to form a high temperature and high pressure water storage tank. High temperature and high pressure water quality stores potential energy, using booster pump unit and heater to convert and store energy during low load period or when waste heat is enriched; for high temperature and high pressure gas, use high pressure steam turbine to recover, heat through reheater to make excess water vapor Carry out low-pressure steam turbine reflux recovery, and then perform energy recovery and cooling through the cooler for secondary energy recovery, and finally use the hydraulic turbine to depressurize and stabilize the working fluid for tertiary recovery, thus forming a closed-loop energy storage and release system. Only one high temperature and high pressure is required. The water storage tank is used for energy storage, the structure is simple, and it can ensure that the normal temperature and pressure water storage tank is used for storage of working fluid, without the requirement of geographical potential difference, and the high temperature and high pressure water vapor is used for mixed storage, with high operating efficiency and high recovery efficiency of potential energy process.

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...

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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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