Preheater applied to liquid state lead bismuth alloy experimental loop

Abstract

The invention relates to a preheater applied to a liquid state lead bismuth alloy experimental loop. The preheater mainly comprises a material pipeline and an electrical heating layer covering the outer side of the material pipeline, wherein the material pipeline is provided with a material inlet and a material outlet; an insulating layer covers the outer side of the electrical heating layer, and the outer side of the insulating layer is a metal protection shell; and the preheater is arranged in a way of forming an inclination angle with a horizontal plane, the material inlet is arranged in a low position, and the material outlet is arranged in a high position. The preheater provided by the invention can carry out great temperature rise preheating on liquid state lead bismuth alloy, the temperature rising level can achieve 200 DEG C, no sealing measure is needed, and the change of a heating element can be realized without the evacuated liquid state lead bismuth alloy.

Description

technical field [0001] The invention belongs to the technical field of heating, in particular to a preheater applied to a liquid lead-bismuth alloy experimental circuit. Background technique [0002] Liquid lead-bismuth alloy (LBE, lead-bismuth eutectic) has good neutronics performance, excellent radiation resistance performance, heat transfer performance and safety characteristics, and is very suitable as a coolant for ADS (accelerator-driven subcritical system) And spallation target material, not only can prolong the life of the target system, but also can improve the safety of the subcritical reactor. At present, liquid lead-bismuth alloy has not only become the material of choice for spallation target and coolant in ADS design, but also an important candidate material for advanced fast neutron reactor coolant. [0003] Due to the special properties of liquid lead-bismuth alloy, it is necessary to conduct systematic and in-depth research on its flow and heat transfer cha...

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Problems solved by technology

Due to the low density of sodium (less dense than water) and relatively low cost, this heating method is very suitable for the experimental circuit of liquid metal sodium, while the density of liquid lead-bismuth alloy is relatively high (about 10 times that of water), if the above The heating method described in the patent requires a larger heat exchange area under the same temperature rise and volume flow rate, and the volume of the shell and tube increases accordingly, and the filling cost of the liquid lead-bismuth alloy is relatively high

In addition, seal failure due to thermal expansion and contraction is also a potential problem during long-term repeated operation

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