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

A graphene and aerosol technology, which is applied in the field of heat transfer in the internal gap of nuclear fuel assemblies, can solve problems such as high thermal resistance, and achieve the effects of improving heat transfer performance, reducing thermal resistance and improving safety.

Active Publication Date: 2021-06-11
NANHUA UNIV
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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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  • Method for improving heat transfer of gap between pellet and cladding based on graphene aerosol
  • Method for improving heat transfer of gap between pellet and cladding based on graphene aerosol
  • Method for improving heat transfer of gap between pellet and cladding based on graphene aerosol

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Embodiment 1

[0043] figure 1 (a) is a schematic diagram of the gap between the core block and the cladding of the present invention; (b) is a top view of the core block and the cladding of the present invention. like figure 1 As shown in (a) and (b), the pellet-cladding gap of the present invention includes a fuel cladding 1 and a fuel pellet 2, the fuel pellet 2 is cylindrical, and the fuel pellet 2 is located inside the fuel cladding 1, The fuel cladding 1 is cylindrical, and an annular gap is formed between the fuel cladding 1 and the fuel pellets 2 , and the annular gap is a helium cavity 3 .

[0044] like figure 2 Shown is a diagram of a capillary microfluidic device for preparing graphene aerosol particles in the present invention. Microfluidic channels are built using microfabrication techniques. The microfluidic channel is composed of a 45° oblique tee capillary and a straight capillary. The oblique tee capillary includes an oblique body and a straight body. Wherein the stra...

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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...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C15/06G21C15/28C01B32/184C01B32/194
CPCG21C15/06G21C15/28C01B32/184C01B32/194Y02E30/30
Inventor 翟鹏迪赵鹏程朱恩平刘紫静王天石
Owner NANHUA UNIV
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