Double-layer straight tube heat exchange tube for liquid metal cooling reactor

Abstract

The invention discloses a double-layer straight tube heat exchange tube for a liquid metal cooling reactor, which consists of an inner tube made of a graphene-doped multi-layer graphene / 316L composite material and an outer tube made of a graphene-doped multi-layer graphene / 316L composite material and tightly combined with the inner tube, the inner wall of the inner pipe and the outer wall of the outer pipe are coated with graphene nanometer anti-corrosion paint, and gallium-based graphene nanometer fluid is injected into a gap between the inner pipe and the outer pipe. The double-layer straight pipe, the multi-layer graphene / 316L composite material and the graphene nano anti-corrosion coating which are tightly attached together are adopted, the probability of occurrence of a fracture accident of the heat exchange pipe is greatly reduced in design, and therefore the thermotechnical safety is effectively improved. Meanwhile, the graphene nanofluid is injected into the gap between the two pipes, so that the heat transfer resistance of the gap at the tight fitting position is greatly reduced, convective heat transfer is enhanced, the fission heat of the reactor core is efficiently exported, and greater economic benefits are further brought.

Description

technical field [0001] The invention belongs to the technical field of heat exchange tubes, and in particular relates to a double-layer straight-tube heat exchange tube for a liquid metal cooling reactor. Background technique [0002] The sodium-cooled fast reactor uses liquid metal sodium as a coolant, and the heat released by the nuclear reaction is carried out of the reactor through the liquid sodium flowing through the core. Sodium has a small neutron absorption cross section, good thermal conductivity, and it is not easy to slow down the neutron speed, and it will not hinder the chain reaction in the fast reactor, so it is an ideal cooling liquid. However, the disadvantage of sodium is that it is chemically active, and it is easy to react with oxygen and water. When using sodium, strict precautions should be taken. In order to ensure the safety of the core when the sodium-water reaction occurs due to the leakage of the steam generator, a sodium-cooled fast reactor is a...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to meet the needs of liquid metal cooling reactor heat exchange tubes, to overcome the complex structure of the current prior art system, which affects the economy and safety of the reactor, and to provide a simple structure, small pressure loss of the shell side coolant, which can The design reduces the probability of heat exchange tube rupture accidents, and at the same time can efficiently extract the fission heat of the reactor core. It is a double-layer straight tube heat exchange tube suitable for liquid metal cooling reactors.

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