An electric heater for molten salt heating

Abstract

The invention discloses an electric heater for molten salt heating. The electric heater is realized by arranging multiple groups of serpentine heating tube bundles composed of bent and reciprocatingly arranged serpentine heating tubes inside the heater shell. Enlarging the heat dissipation area of ​​the heater increases the heating area of ​​the molten salt flowing through the heater shell. And by setting the upper wiring cavity and the lower wiring cavity for accommodating the cables connected to the electric heating elements inside the serpentine heating tube on the cylindrical shell between the molten salt inlet and the molten salt outlet, the cables of the electric heating elements are kept away from the melting Salt inlet and molten salt outlet, and reduce the volume inside the heater shell occupied by the terminal of the electric heating element. Compared with the heating tube bundle in the form of U-tube, under the same heating power, that is, the heating load is the same, the heating power per unit area of ​​the serpentine heating tube bundle is lower, which reduces the temperature difference between the heating tube wall surface and the molten salt, and speeds up the heat conduction efficiency. It effectively solves the problem of overheating of the film temperature on the surface of the heating tube.

Description

technical field [0001] The invention belongs to the field of molten salt heat storage equipment, and in particular relates to an electric heater for heating molten salt. Background technique [0002] In recent years, the problem of burning coal for heating has become the focus of people's attention. Environmental pollution has become more and more serious, seriously affecting human health. Clean heating is regarded as an ideal alternative energy source. The country has introduced the "coal-to-electricity" policy to reduce energy consumption and alleviate the problem of smog, but at the same time it has also increased the load and peak-valley difference of the power grid. Electric energy storage technology is undoubtedly the most direct and effective means to solve the problem of peak-valley difference in the power grid. . At present, the ideal heat supply method is the heat storage heat supply technology of double-tank molten salt low-valley electricity. It uses low-valley ...

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Problems solved by technology

[0007] In order to solve the problems in the prior art, the problem to be solved by the present invention is to provide an electric heater for heating molten salt; the electric heater has a simple structure, good heating and thermal conductivity, high insulation, and can realize small flow Stable heating with large temperature difference, molten salt electric heater that meets various flow operating conditions of the system, and solves the problems existing in the existing molten salt electric heater

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