Water-gas double-working-medium energy storage method and system

Abstract

The invention discloses a water-gas double-working-medium energy storage method and system. A heat insulation device used for insulating heat transfer is arranged in a gas-liquid coexistence cabin, and a gas inlet and a liquid inlet of the gas-liquid coexistence cabin are connected with a gas temporary storage cabin and a water storage pool correspondingly and used for storing energy; the liquid outlet of the gas-liquid coexistence cabin is connected with the water storage pool for releasing the energy; and the gas outlet of the gas-liquid coexistence cabin is divided into two paths through a gas-liquid separator, one path is connected with the inlet of a gas buffering cabin, and the other path is connected with the water storage tank and used for gas-liquid separation and gas recycling. According to the water-gas double-working-medium energy storage method and system, the defect that the energy storage container of an existing energy storage system is insufficient in power capability due to gas temperature reduction in the energy release process is fundamentally overcome, the problem that the gas storage amount of the energy storage container is insufficient is solved, and meanwhile the power capability of the system can be flexibly adjusted.

Description

technical field [0001] The invention belongs to the technical field of electric energy storage, and in particular relates to a water-gas duplex energy storage method and system. Background technique [0002] It has become the consensus of all countries in the world to increase the proportion of new energy power supply. However, there is an instantaneous and strong coupling relationship between new energy resources and new energy power generation. Due to the inherent volatility and uncertainty of new energy, it is inevitable that the supply of new energy power generation cannot fully match the demand on the grid user side, which will lead to a severe problem of "abandoning wind / light", which is specifically manifested in the severe new Energy consumption problem. [0003] As a transitional technology of the power system, energy storage technology can effectively alleviate the fluctuation of power load in my country's power grid, and at the same time effectively solve the pro...

AI Technical Summary

Problems solved by technology

[0005] (1) During the energy release process, as the gas pressure in the energy storage container continues to decrease, the temperature of the high-pressure gas stored inside drops rapidly, resulting in the inability to completely release the pressure potential energy stored in the energy storage container during the energy storage process, which not only reduces The power output of the system during the energy release process is reduced, and the energy utilization rate of the system is reduced;

[0006] (2) During the actual operation of the system, the energy storage container is prone to gas leakage during maintenance or normal operation, which leads to the defect of insufficient internal gas storage in the energy storage container, so the power generation of the system during the energy release process cannot be achieved. Meet the design requirements, or although the energy storage container is well sealed, it cannot meet the surge in power demand on the load side in extreme cases, which reduces the flexible operation characteristics of the system

The above defects lead to great limitations in commercial application of pumped compressed gas energy storage systems

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