Method for improving heat transfer of gap between pellet and cladding based on graphene aerosol

Abstract

The invention relates to a method for improving heat transfer of a gap between a pellet and a cladding based on graphene aerosol. The method comprises the following steps: (1) preparing graphene aerosol particles; (2) mixing the graphene particles prepared in the step (1) with helium to prepare aerosol; and (3) injecting the mixed aerosol serving as a filling medium between the fuel pellet and the cladding into the gap between the fuel pellet and the cladding. The mixed aerosol is used as the filling medium of the gap between the core block and the cladding in the fuel rod, and compared with the traditional mode that single helium is used as the filling medium, the thermal resistance between the fuel core block and the cladding is greatly reduced, so that the heat of the fuel core block is more efficiently guided out, and the operation safety performance of a nuclear reactor is improved.

Description

technical field [0001] The invention relates to the field of internal gap heat transfer of nuclear fuel assemblies, in particular to a graphene aerosol-based method for improving gap heat transfer between pellets and cladding. Background technique [0002] As an efficient, economical and reliable clean energy, nuclear energy has attracted great attention and has a good development prospect. The utilization of nuclear energy is usually achieved through nuclear reactors. The fission reaction of the nuclear fuel in the nuclear reactor releases a large amount of heat, which is then absorbed by the coolant and carried out of the core. Nuclear fuel is usually made into smaller cylinders, known as fuel pellets, which are packed into fuel rod claddings. The heat generated by the nuclear fuel fission reaction needs to be transferred to the fuel cladding and taken away by the coolant. Since the fuel pellets have a relatively high temperature during the reaction process, the heat is q...

AI Technical Summary

Problems solved by technology

Using helium mixed with graphene aerosol particles as the filling medium for the gap between the fuel pellet and the cladding, compared with using single helium as the filling medium, it can effectively reduce the thermal resistance of the gap and improve the heat export efficiency of the pellet, which is better Solve the problem of high thermal resistance of the fuel pellet-cladding gap when single helium is used as the filling medium

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