Storage tank for large-scale fused salt energy storage

Abstract

The invention discloses a storage tank for large-scale fused salt energy storage, and relates to the technical field of fused salt energy storage. In order to solve the problems that according to an existing fused salt storage tank, due to the fact that the freezing point temperature of fused salt is high, when the fused salt heat storage double tanks operate, the liquid level can change vertically, and the lowest liquid level is close to the bottom of the tank body, a pump shaft of a fused salt pump needs to be long and extends below the liquid level, and due to the fact that the pump shaft cannot be made to be too long, the tank body is limited to be too high. The technology that hot salt with low density is located on the upper portion, cold salt with high density is located on the lower portion, and a temperature gradient layer, namely a thermocline layer is arranged in the middle is adopted, through a salt distributor and a pipeline system, during heat storage, hot salt passes through a hot salt pipeline system and enters a tank body through a hot flat plate type salt distributor, cold salt is pumped out of the tank body through a cold salt pump, and the thermocline layer gradually moves downwards; the heat storage process is finished; during heat release, hot salt is pumped out of the tank body through a hot salt pump, cold salt enters the tank body from the cold flat plate type salt distributor through a cold salt pipeline system, and the thermocline gradually moves upwards. The method is suitable for the technical field of high-temperature fused salt energy storage.

Description

Technical field [0001] The present invention relates to the field of molten salt storage, and more particularly to a storage tank for a large-scale molten salt. Background technique [0002] The energy storage system is a discontinuous problem that solves wind energy, solar energy, and realizes the effective means of power grid picking peaks, promoting the effective means of cleaning energy, and has positive significance for achieving "double carbon" goals. At present, common energy storage modes include electrochemical energy storage, pumping energy storage, compressed air storage, melt salt storage and flywheel energy storage, which can achieve only a large-scale storage and compressive air energy storage, but The two are also subject to local conditions such as geography, season, and cannot be widely used. High-temperature melting salt heat is a technical solution that is often used in a photothermal power generation system. It is also a more mature scheme that stores high-qua...

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Problems solved by technology

[0003] The present invention solves the problem that the existing molten salt energy storage storage tank has a high freezing point temperature of the molten salt. In order to avoid the condensation of the molten salt in the pump, the pump is arranged on the top of the tank. When the molten salt heat storage double tanks are in operation, the liquid level will change up and down , the lowest point is close to the bottom of the tank, so the pump shaft of the molten salt pump needs to be longer and extend below the liquid surface. Since the pump shaft cannot be too long, the tank body cannot be too high, resulting in a smaller volume of the tank body , which leads to the problem of smaller volume, and other single-tank schemes, additional molten salt tanks and their connecting pipes and heat tracing devices are required, which increases the number of failure points, and the system is complicated and reliable. A large-scale Storage tanks for molten salt energy storage

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