A high energy density energy storage and release system and energy storage and release method

Abstract

The invention discloses a high-energy-density energy storage and release system and an energy storage and release method. The water after a booster pump unit passes through a heater is heated and pressurized and stored in a high-temperature and high-pressure water storage tank to form high-temperature and high-pressure water quality storage potential energy. When electric energy is needed, the high-temperature and high-pressure working medium in the high-temperature and high-pressure water storage tank is directly reheated through the reheater to form completely saturated superheated steam, and the fully saturated superheated steam expands into wet saturated steam in the high-pressure steam turbine to store high-temperature and high-pressure water The working fluid coming out of the tank can be simply heated to meet the maximum steam energy recovery requirements, and then the waste heat that flows into the cooler is recovered and cooled, and then returned to the normal temperature water storage tank, thus forming a closed-loop energy storage and release system, only one high-temperature and high-pressure water storage tank is required For energy storage, the structure is simple, and it can ensure the use of normal temperature water storage tanks for storage of working fluids, without geographical potential difference requirements, and the use of high temperature and high pressure water vapor mixed storage, high operating efficiency, and high recovery efficiency in the process of potential energy.

Description

technical field [0001] The invention relates to the technical field of physical energy storage, in particular to a high-energy-density energy storage and release 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 gener...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a high energy density energy storage and release 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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