A method and system for energy storage of water-gas duplex

Abstract

The invention discloses a water-gas dual working medium energy storage method and system. A heat-insulating device for insulating heat transfer is arranged inside a gas-liquid coexistence chamber, and the gas and liquid inlets of the gas-liquid coexistence chamber are respectively connected with the gas buffer chamber and the water storage chamber The tank connection is used for energy storage; the liquid outlet of the gas-liquid coexistence tank is connected to the water storage tank for energy release; the gas outlet of the gas-liquid coexistence tank is divided into two paths through the gas-liquid separator, one is connected to the inlet of the gas buffer tank, and the other is connected to the inlet of the gas buffer tank. One way is connected to the reservoir for gas-liquid separation and gas recycling. The invention fundamentally solves the defect that the energy storage container of the existing energy storage system is insufficient in working capacity due to the decrease of gas temperature during the energy release process, and solves the problem of insufficient gas storage of the energy storage container, and at the same time, the system can be flexibly adjusted of functional ability.

Description

technical field [0001] The invention belongs to the technical field of electrical energy storage, and in particular relates to a water-gas duplex energy storage method and system. Background technique [0002] Increasing the proportion of new energy power supply has become the consensus of all countries in the world. However, there is an instantaneous 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 cannot fully match the demand on the grid user side, which will lead to severe "wind / light abandonment" problems, which are manifested in 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 grid connection problems caused by vola...

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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