Shell and tube heat exchanger for exchanging heat of fused salts with different temperatures

Abstract

The invention provides a shell and tube heat exchanger for exchanging heat of fused salt with different temperatures. The shell and tube heat exchanger is used for exchanging heat between cold salt and hot salt and at least comprises a shell, a first tube plate and a second tube plate which are respectively mounted at both ends in the shell, and a heat exchange tube fixed between the first tube plate and the second tube plate, wherein the heat exchange tube comprises a straight tube and a spiral tube communicated with the straight tube. The shell and tube heat exchanger further comprises a hot salt inlet, a hot salt outlet, a cold salt outlet and a cold salt inlet formed in the bottom of the shell, which are formed in the top of the shell. According to the shell and tube heat exchanger, one end of the heat exchange tube is provided with the spiral tube, so that the problem of thermal expansion of the heat exchange tube due to high temperature of fused salt can be avoided, so as to prevent movement of the tube plates due to expansion pressure and prolong the service life of the shell and tube heat exchanger; and furthermore, due to the arrangement of the spiral tube, the heat exchange area can be enlarged, and thus the heat exchange effect can be greatly enhanced.

Description

technical field [0001] The invention relates to the field of molten salt heat exchangers, in particular to a shell-and-tube heat exchanger used for heat exchange of molten salts at different temperatures. Background technique [0002] At present, solar power plants with heat storage function in the field of photothermal power generation use molten salt as the heat storage medium. By converging sunlight on the molten salt heat absorber, the temperature of the molten salt rises, and then the molten salt is introduced into the heat storage tank to store heat. The heat in the molten salt is converted into the heat of the working medium of the Rankine cycle through the heat exchanger. Generally, water is used as the working medium of the Rankine cycle. The liquid water absorbs heat in the heat exchanger and becomes superheated steam to drive the steam turbine to generate electricity. When the molten salt flows in the heat exchanger and its intermediate heat exchange tubes, the mo...

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Problems solved by technology

[0003] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a shell-and-tube heat exchanger for heat exchange of molten salts at different temperatures, which is used to solve the problem of blocked pipelines caused by molten salts in the prior art and problems caused by molten salts. High temperature causes thermal expansion of heat exchange tubes, which improves the service life of shell and tube heat exchangers

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