High-temperature air molten salt heat exchanger

Abstract

The invention relates to a high-temperature air molten salt heat exchanger which is provided with a container, a stirrer and a heat exchange pipe set. A molten salt inlet and a molten salt outlet areformed in the container, the stirrer comprises a driver for driving a stirring shaft, the driver is fixedly arranged on the container, and the stirring shaft extends into the container; the heat exchange pipe set comprises a plurality of heat exchange pipes, and gaps allowing molten salt to flow are formed between the heat exchange pipes; and the heat exchange pipe set is arranged outside the stirring shaft in a surrounding manner, and inlets and outlets of the heat exchange pipe set extend out of the container. The problems that when hot air in a conventional heat exchanger heats the molten salt, the energy density of the air side is low, the flow is large, the temperature difference between an inlet and an outlet of the molten salt side is large, the flow is small, consequently the flowspeed of the molten salt is too low, the viscosity of the molten salt is relatively high, heat is slowly taken away, and a molten salt side pipe wall film is high in temperature and easy to decomposeare effectively solved.

Description

technical field [0001] The invention relates to the field of high-temperature waste heat recovery, in particular to a high-temperature air molten salt heat exchanger. Background technique [0002] Molten salt has the advantages of large latent heat, high energy storage density, small undercooling, good thermal stability, wide heat storage and heat release temperature range, and low cost. Therefore, it is widely used as a heat storage medium for solar thermal utilization. During the use of molten salt, it needs to be heated in some links. The conventional molten salt heat exchange device is a shell and tube heat exchanger (see Figure 8 ), which mainly heats the molten salt and stores it in the salt tank through the heat source (hot air, high-temperature heat transfer oil, etc.) inside or outside the heat exchange tube. [0003] Because the flow rate of molten salt is determined by the flow rate of molten salt and the size of the flow section. In the case of constant flow ...

AI Technical Summary

Problems solved by technology

[0005] It is precisely because of the defects of the existing molten salt heat exchanger that it takes multiple heat exchanges to raise the temperature of the molten salt to the required temperature, resulting in low efficiency and high energy consumption

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