CN219319135U - Multistage heat pipe device for containment air cooling heat trap - Google Patents

Abstract

The utility model provides a multistage heat pipe device for a containment air cooling heat sink, and relates to the technical field of containment cooling. Comprises an outer tube and an inner tube; the outer tube comprises an upper-section outer tube, a middle-section outer tube and a lower-section outer tube from top to bottom, the upper-section outer tube and the lower-section outer tube are vertically arranged, the middle-section outer tube is horizontally arranged, and the middle-section outer tube penetrates through the containment; the inner pipes are nested in the outer pipe, and a plurality of inner pipes are arranged in the outer pipe; the inner pipe is internally filled with a first working medium, and a second working medium is filled between the outer pipe and the inner pipe. The multistage heat pipe device greatly improves the heat transmission efficiency of the containment, and overcomes the defect that the heat transmission capacity of the long-distance heat pipe is limited.

Description

Multistage heat pipe device for containment air cooling heat trap

Technical Field

The utility model relates to the technical field of containment cooling, in particular to a multistage heat pipe device for a containment air cooling heat sink.

Background

The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.

In a nuclear power plant, a containment needs to have a heat sink function in addition to protecting as a safety barrier. For the overtemperature and overpressure problems of the containment, various countries have conducted research on passive technology for realizing heat conduction of the containment. In short, in the air cooling heat trap of the containment, heat in the containment needs to be transported to the outside of the containment through the heat pipe, so as to realize passive cooling of the containment.

The inventor finds that the following problems exist in the existing containment heat conveying process: when the distance from the heat source point inside the containment to the heat release point outside the containment is longer, the length of the heat pipe also increases correspondingly. When the length of the heat pipe reaches a certain length, the conveying capacity of the gas-phase working medium in the heat pipe is limited due to factors such as pipeline resistance, gas-liquid phase countercurrent mixing and the like, so that the heat transfer capacity of the heat pipe is limited.

Disclosure of Invention

In order to solve the defects in the prior art and ensure the heat transfer capability of the containment air cooling heat sink, the utility model provides a multistage heat pipe device for the containment air cooling heat sink, and the heat conduction of a long-scale heat pipe is realized through the connection of multistage heat pipes.

The utility model adopts the following technical scheme:

a multistage heat pipe device for a containment air-cooled heat sink comprises an outer pipe and an inner pipe; the outer tube comprises an upper-section outer tube, a middle-section outer tube and a lower-section outer tube from top to bottom, the upper-section outer tube and the lower-section outer tube are vertically arranged, the middle-section outer tube is horizontally arranged, and the middle-section outer tube penetrates through the containment; the inner pipes are nested in the outer pipe, and a plurality of inner pipes are arranged in the outer pipe; the inner pipe is internally filled with a first working medium, and a second working medium is filled between the outer pipe and the inner pipe.

Furthermore, the central lines of the inner pipes in the same section of outer pipe are overlapped, and a certain distance is reserved between the inner pipes.

Further, the outer wall of the inner tube is fixedly connected with the inner wall of the outer tube through a clamp.

Further, the containment vessel is a steel containment vessel or a prestressed concrete containment vessel.

Further, the middle section outer tube is connected with the containment through a penetrating piece.

Further, the outer tube penetrating through the containment is arranged in a certain gradient.

Further, a baffle plate is arranged in the outer tube, and the section of the baffle plate is arranged in a shape like a Chinese character' ji

Further, the partition plate is arranged in the upper section outer tube and the lower section outer tube.

Furthermore, the partition plate is made of a material with good heat conductivity.

Further, the working medium is water, methanol, ethanol, acetone or ammonia water.

Compared with the prior art, the utility model has the beneficial effects that:

the utility model discloses a multistage heat pipe device for a containment air cooling heat trap, which enables each inner pipe and the outer pipe part clamped by the adjacent inner pipes to form a heat pipe, and heat in the heat pipe is conveyed from bottom to top, so that gradual heat transmission is realized, the containment heat transmission efficiency is greatly improved, and the defect of limited heat transmission capacity of a long-distance heat pipe is overcome.

The utility model realizes the heat transmission in the long heat pipe by arranging the multi-stage heat pipes, and ensures the heat transfer capacity of the long heat pipe. The heat transfer capability of the heat pipe penetrating through the containment is ensured by isolating the heat pipe penetrating through the containment from front to back.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model.

FIG. 1 is a schematic view of a connection structure between an inner tube and an outer tube according to an embodiment of the present utility model;

FIG. 2 is a schematic view of the overall structure of an outer tube according to an embodiment of the present utility model;

FIG. 3 is a schematic diagram illustrating a connection relationship between a multi-stage heat pipe device and a containment according to an embodiment of the present utility model.

In the figure: 1. outer tube 2, inner tube 3, collar, 4, penetration, 5, baffle, 6, containment, 7, pressure vessel, 8, circuit pressure boundary, 9, heat source.

Detailed Description

The utility model will be further described with reference to the drawings and examples.

It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the utility model. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present utility model. As used herein, the singular forms also are intended to include the plural forms unless the present utility model clearly dictates otherwise, and furthermore, it should be understood that when the terms "comprise" and/or "include" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof;

for convenience of description, the words "upper", "lower", "left" and "right" in the present utility model, if they mean only that the directions are consistent with the upper, lower, left, and right directions of the drawings per se, and do not limit the structure, only for convenience of description and simplification of the description, but do not indicate or imply that the apparatus or element to be referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

The terms "mounted," "connected," "secured," and the like are to be construed broadly and refer to either a fixed connection, a removable connection, or an integral body, for example; the terms "mechanically coupled" and "directly coupled" may be used interchangeably to refer to either a mechanical coupling, an indirect coupling via an intermediary, an internal coupling of two elements, or an interaction of two elements, as would be understood by one of ordinary skill in the art, and the terms are to be understood in the specific sense of the present utility model as appropriate.

Examples

The utility model provides a multistage heat pipe device for a containment air cooling heat trap, which is based on the prior art and aims to solve the technical problems in the background art, and comprises an outer pipe 1 and an inner pipe 2 as shown in figures 1 and 2; one end of the outer tube 1 is communicated with air, and the other end is arranged above the heat source 9 and used for absorbing heat to transfer heat. The outer tube 1 is an upper-section outer tube, a middle-section outer tube and a lower-section outer tube which are spliced from top to bottom, the upper-section outer tube and the lower-section outer tube are vertically arranged, the middle-section outer tube is horizontally arranged, and the middle-section outer tube penetrates through the containment; the inner tube 2 is nested in the outer tube 1, and a plurality of closed inner tubes 2 are arranged in the outer tube 1; the inner pipe 2 is internally filled with a first working medium, and a second working medium is filled between the outer pipe 1 and the inner pipe 2. The working medium is water, methanol, ethanol, acetone or ammonia water. In this embodiment, the first working medium is different from the second working medium. In order to ensure the heat transfer effect, the first working medium in the inner tube 2 is not filled with the inner tube when being filled.

The outer wall of the inner tube 2 is fixedly connected with the inner wall of the outer tube 1 through a clamp 3. In this embodiment, the connection mode between the clip 3 and the inner and outer pipes is welding. Therefore, each inner tube 2 and the part of the outer tube 1 clamped by the adjacent inner tube 2 form a heat pipe, heat in the heat pipe is conveyed from bottom to top, gradual heat transmission is realized, and the defect that the heat transmission capacity of the long-distance heat pipe is limited is overcome.

The central lines of a plurality of inner pipes 2 in the same section of outer pipe are overlapped, and a certain distance is reserved between the inner pipes 2 and the inner pipes 2.

The containment vessel 6 is a steel containment vessel or a prestressed concrete containment vessel, and the containment vessel 6 includes a pressure vessel 7, a circuit pressure boundary 8, and a heat source 9. The middle outer tube is connected with the containment through a penetrating piece 4. As shown in fig. 3, since the containment penetration 4 is mostly horizontally disposed, the outer tube penetrating the containment is disposed at a slope, and in this embodiment, the slope is not greater than 10 °. The containment penetration piece 4 is circular and is arranged on the containment, and the center of the containment penetration piece can penetrate through the outer tube 1 to meet ASMEII-level requirements.

The baffle 5 is also arranged in the outer tube 1, the cross section of the baffle 5 is in a shape like a Chinese character 'ji', and the contact area between the baffle 5 and the upper and lower media can be increased. The partition plate 5 is arranged in the upper section outer tube and the lower section outer tube, and the section protruding part of the partition plate is always upwards. The partition board 5 is made of a material with good heat conductivity, so that a local heat pipe is formed by penetrating the outer pipe 1 of the containment, and the heat transfer capacity is prevented from being greatly influenced.

The heat pipes adopt a multi-stage transmission mode, so that the problem of limited steam conveying capacity is solved, each stage corresponds to one heat pipe, and then the heat pipes are connected in series to form the whole heat pipe as shown in fig. 3. The heat pipe is fixed on the building through the bracket. The working principle is as follows:

when an accident occurs in the nuclear power station, there is a possibility that the primary circuit pressure boundary 8 is broken, a great amount of hydrogen is generated by melting the reactor core in the pressure vessel 7, the safety 6 is filled with high-temperature gas, if heat is not continuously taken away, the safety shell 6 is overpressured, and the radioactivity is released greatly due to the broken primary circuit pressure boundary. The heat of the heat source 9 in the containment vessel 6 is transferred upwards to the air through the heat pipe, the working medium in the heat pipe is condensed and reflowed, the heat of the containment vessel is taken away in a multistage transfer mode, and finally the heat in the containment vessel 6 is discharged by utilizing the air heat trap.

It should be noted that, the foregoing description is only a preferred embodiment of the present utility model, and although the present utility model has been described in detail with reference to the foregoing embodiment, it will be apparent to those skilled in the art that modifications may be made to the technical solutions described in the foregoing embodiments, or equivalents may be substituted for some of the technical features thereof, and any modifications, equivalents, improvements or changes thereof may be made without departing from the spirit and principle of the present utility model.

Claims (10)

1. A multi-stage heat pipe device for a containment air-cooled heat sink, comprising an outer pipe and an inner pipe; the outer tube comprises an upper-section outer tube, a middle-section outer tube and a lower-section outer tube from top to bottom, the upper-section outer tube and the lower-section outer tube are vertically arranged, the middle-section outer tube is horizontally arranged, and the middle-section outer tube penetrates through the containment; the inner pipes are nested in the outer pipe, and a plurality of inner pipes are arranged in the outer pipe; the inner pipe is internally filled with a first working medium, and a second working medium is filled between the outer pipe and the inner pipe.

2. The multiple stage heat pipe device for a containment air cooled heat sink of claim 1 wherein the centerlines of the plurality of inner pipes within the same section of outer pipe are coincident and spaced apart from each other.

3. The multiple stage heat pipe device for a containment air cooled heat sink of claim 1 wherein the outer wall of the inner pipe is fixedly connected to the inner wall of the outer pipe by a clip.

4. The multi-stage heat pipe device for a containment air-cooled hot well according to claim 1, wherein the containment is a steel containment or a prestressed concrete containment.

5. The multi-stage heat pipe device for a containment air-cooled heat sink of claim 1 wherein the intermediate outer pipe is connected to the containment by a penetration.

6. A multi-stage heat pipe assembly for a containment air cooled heat sink as recited in claim 1 wherein the outer pipe extending through the containment is disposed at a gradient.

7. The multi-stage heat pipe device for a containment air-cooled heat sink of claim 1 wherein a baffle is further disposed within the outer pipe, the baffle having a "figure" cross-section.

8. The multiple stage heat pipe device for a containment air cooled heat sink of claim 7 wherein the baffles are disposed within the upper and lower outer pipes.

9. The multiple stage heat pipe device for a containment air cooled hot well as recited in claim 7 wherein the spacer is made of a material having good thermal conductivity.

10. The multi-stage heat pipe device for a containment air cooled heat sink of claim 1 wherein the working fluid is water, methanol, ethanol, acetone or ammonia.

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