Preheater for thermotechnical experiment loop

Abstract

The invention discloses a preheater for a thermotechnical experiment loop. The preheater comprises at least two heating units arranged in series, an inlet flange and an outlet flange. Any heating unitcomprises a heating pipeline and a heating element arranged on the heating pipeline, and the inlet flange and the outlet flange are arranged at an inlet and an outlet of the preheater correspondingly. According to the preheater, the at least two heating units are arranged in series, the preheater is stable and controllable in heating power, high in heat flux density and good in heat exchange efficiency, and due to the fact that the preheater comprises the multiple heating units, the preheater is more stable in performance and easy to manufacture and maintain.

Description

Technical field[0001]The invention relates to the technical field of heating equipment, in particular to a preheater of a thermal experiment loop.Background technique[0002]At present, the preheater used in the thermal experiment loop is mainly heated by electric heating elements to make the temperature of the fluid medium meet the process requirements. Commonly used electric heating elements include electrodes, electric heating wires and electric heating rods.[0003]Electrode heating requires more copper electrodes to be welded on the heating pipe, which is costly and occupies a large space. The weld seam must also ensure conductivity and strength, and the welding requirements are high. At the same time, in order to make the circuit uncharged, the electrode is energized and heated, and the preheater must be insulated. There are usually two ways of insulation. One is to install an insulating flange, which is easy to lose the insulation performance and sealing performance for high temp...

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Problems solved by technology

[0005] The electric heating rod can withstand high temperature, the power is stable and controllable, and the diameter of the heating rod can be customized. However, as in the Chinese patent CN201820568038.2, the heating rods are arranged in a centralized manner in the cylinder, which is not suitable for the small flow condition of the thermal experiment circuit , the inner diameter of the cylinder is much larger than the inner diameter of the process pipe, which will cause the flow rate of the fluid to become very low after entering the cylinder, resulting in poor heat transfer effect of the electric heating rod, that is, the temperature of the electric heating rod is high but the temperature of the fluid does not increase much

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