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A kind of head with enhanced boiling heat transfer network groove connected to the surface of the hole array

A technology of enhanced boiling and array holes, applied in sealing, nuclear power generation, climate sustainability, etc., can solve the problems of reliability, effectiveness, controllability, coating damage, etc., to delay critical crisis and increase heat transfer Area, the effect of enhancing the boiling heat transfer process

Inactive Publication Date: 2016-08-17
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Studies have shown that porous coatings can better enhance boiling heat transfer and increase critical heat flux, but coatings are relatively easy to be damaged during transportation and installation, and their reliability and effectiveness during long-term operation It is also difficult to ensure controllable

Method used

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  • A kind of head with enhanced boiling heat transfer network groove connected to the surface of the hole array
  • A kind of head with enhanced boiling heat transfer network groove connected to the surface of the hole array
  • A kind of head with enhanced boiling heat transfer network groove connected to the surface of the hole array

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Experimental program
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Effect test

Embodiment 1

[0041] figure 1 It is a structural schematic diagram of a sealing head provided by the first embodiment of the present invention, which has network-like grooves communicating with the surface of array holes for enhanced boiling heat transfer. figure 2 It is a schematic diagram of a three-dimensional cross-sectional structure of an enhanced boiling heat exchange network groove interconnected array hole structure provided by the first embodiment of the present invention.

[0042] Such as figure 1 and figure 2As shown, a reticular groove 5 is arranged on the outer surface 2 of the lower head 1 of the reactor pressure vessel, and is arranged at the intersection of a plurality of groove units 51 that form the reticular cross-communication arrangement of the reticular groove 5 The communication hole unit 41, several groove units 51 communicate with the adjacent communication hole units 41, thereby forming a structure of array holes connected by network grooves on the head outer ...

Embodiment 2

[0056] Figure 15 Shown is a three-dimensional cross-sectional view of the second embodiment. In order to further increase the wettability of the array hole structure 3 connected by the mesh groove to further enhance the boiling heat transfer and increase the critical heat flux density, a mesh groove can be set on the outer surface 2 of the lower head of the reactor pressure vessel On the basis of the connected array hole structure, isolated hole units 42 are arranged on the smooth surface to further increase the heat exchange area, enhance the wettability of the wall surface, enhance boiling heat exchange and increase the critical heat flux density. The isolated hole unit 42 is a kind of hole unit not connected by the groove unit 51 , and the communicating hole unit 41 is a kind of hole unit connected by the groove unit 51 . The structural features of the isolated hole unit 42 and the connected hole unit 41 in this embodiment are the same or different. The hole unit 4 in th...

Embodiment 3

[0060] Figure 16 Shown is a three-dimensional cross-sectional view of a third embodiment. In order to further increase the wettability of the array hole structure 3 connected by the mesh groove to further enhance the boiling heat transfer and increase the critical heat flux density, a mesh groove can be set on the outer surface 2 of the lower head of the reactor pressure vessel On the basis of the connected array hole structure, set micro-surface structures such as micro-grooves, micro-protrusions and / or micro-holes, such as triangular micro-grooves, rectangular micro-grooves, columnar micro-protrusions, hemispherical micro-protrusions, micro-round holes , micro-irregular holes, sandblasting rough surface, rough surface processing, etc., can improve the wettability of the wall, and is more conducive to the liquid entering the heat transfer surface, so that the boiling heat transfer can be further enhanced and the critical heat flux density can be increased. The micro-surface...

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Abstract

The invention relates to the technical field of enhanced heat exchange and particularly relates to a sealing head with an enhanced boiling heat exchange array hole surface with a communicated net-shaped groove. The sealing head is characterized in that the net-shaped groove is arranged on the outer surface of a lower sealing head of a reactor pressure container and consists of a plurality of groove units which are intersected in a net shape and are distributed in a communicating manner; the intersecting positions of the groove units are respectively provided with a communicating hole unit, so that an array hole structure with the communicated net-shaped groove is formed on the outer surface of the sealing head. When the nuclear reactor starts an external cooling measure of the pressure container, cooling water can form a stable vaporization core by the array hole structure and generate steam jet continuously, the communicated net-shaped groove can absorb the cooling water under the action of capillary force to wet the heat exchange surface, and cooling water needed for boiling heat exchange at the array hole structure is continuously supplemented. The sealing head has the advantages that the boiling heat exchange process can be obviously enhanced, and the critical heat-flow density can be obviously increased, so that the safety of the nuclear reactor is obviously improved.

Description

technical field [0001] The present invention relates to the technical field of enhanced heat exchange, in particular to a head with enhanced boiling heat transfer mesh grooves connected to the surface of array holes, which is used for the outer wall surface of the lower spherical head of a large nuclear power reactor pressure vessel under a severe nuclear accident. Boiling heat transfer enhancement to improve the safety of nuclear power reactors. Background technique [0002] Severe accidents in large nuclear power reactors may lead to core meltdown. Cooling and retaining the molten material in the reactor pressure vessel is a key measure to mitigate the accident. By filling the reactor chamber with water, submerging the hemispherical head at the bottom of the pressure vessel, and boiling the pool outside the pressure vessel, it is an important measure to mitigate severe accidents. Utilize the boiling heat transfer and passive natural circulation flow of the water outside t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21C15/18G21C15/12G21C13/028
CPCY02E30/30
Inventor 孟继安钟达文
Owner TSINGHUA UNIV
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