Connecting structure of salt inlet pipe and molten salt storage tank for molten salt storage tank

Abstract

The invention relates to a connecting structure for a salt inlet pipe and a molten salt storage tank of the molten salt storage tank. The salt inlet pipe extends into the tank top of the storage tank,at the top of the storage tank, and the salt inlet pipe is connected with the tank top of the storage tank through an expansion connection structure; in the middle of the storage tank, a vertical pipe section of the salt inlet pipe is connected with the inner wall of the storage tank through a salt inlet pipe support, the vertical pipe section can freely move in the radial direction of the storage tank during salt feeding of the salt inlet pipe; at the bottom of the storage tank, a horizontal pipe section of the salt inlet pipe is elastically connected with a bottom plate of the storage tankthrough an elastic support, one end of the elastic support is arranged on the bottom plate of the storage tank, the other end of the elastic support is used for supporting the horizontal pipe section,the salt inlet pipe is used for feeding salt, the horizontal pipe section can freely move in the vertical direction, the problems that in the prior art, due to the fact that the temperature of the molten salt pipeline is not synchronous with the temperature change of the storage tank, the thermal expansion amount of the storage tank and the thermal expansion amount of the salt inlet pipe are different, the service life of the storage tank is reduced, the damage risk of the connection part is increased and the like are solved.

Description

technical field [0001] The invention relates to the field of solar thermal power generation, in particular to a connection structure of a salt inlet pipe for a molten salt storage tank and a molten salt storage tank. Background technique [0002] Solar thermal power generation technology uses solar energy to generate electricity, which is an important direction for large-scale utilization of solar energy. Its most competitive advantage is that it is easy to combine with heat storage systems. influences. Molten salt has the characteristics of high operating temperature, wide temperature range, good flow characteristics, and large heat capacity. It can be used for large-scale heat storage in solar thermal power plants and is currently the most widely used solar heat storage medium. [0003] In the heat storage system of the solar thermal power station, the molten salt storage tank is one of the key equipments. Due to the instability of solar radiation, the temperature of the...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a connection structure between the salt inlet pipe and the molten salt storage tank for the molten salt storage tank, so as to solve the problem in the prior art that the temperature of the molten salt pipeline and the temperature of the storage tank are not synchronized. The thermal expansion is different from the thermal expansion of the salt inlet pipe, and the stress of the connection between the salt inlet pipe and the storage tank increases. This alternating stress change will reduce the service life of the storage tank and increase the risk of damage to the connection and other technical problems

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