CN111667932A

CN111667932A - Immersion type externally-tangent rotational flow type bubbler structure

Info

Publication number: CN111667932A
Application number: CN202010573817.3A
Authority: CN
Inventors: 臧金光; 闫晓; 张妍; 张君毅; 都宇
Original assignee: Nuclear Power Institute of China
Current assignee: Nuclear Power Institute of China
Priority date: 2020-06-22
Filing date: 2020-06-22
Publication date: 2020-09-15

Abstract

The invention discloses an immersion type externally-tangent rotational flow bubbler structure which comprises a barrel, wherein one end of the barrel is an open end, the other end of the barrel forms a closed end through a lower sealing head, a plurality of bubbling pipes communicated with the interior of the barrel are arranged on the outer wall of the barrel, the bubbling pipes are uniformly distributed along the circumferential direction of the barrel, and the central lines of the bubbling pipes are tangent to an inscribed circle of the barrel. The bubbling pipe is arranged for a circle along the tangential direction, so that the outflow steam generates circumferential rotating motion, namely, the outflow steam moves along the radial direction and moves along the circumferential direction; due to the jet flow effect of the steam, part of the steam is condensed into a liquid phase, and part of the steam and the non-condensable gas continue to move spirally, so that the liquid around the bubbler is pushed to generate rotary motion, the distribution and mixing of the liquid are promoted, the action area of the steam and the supercooled fluid is increased, and the steam is favorably and effectively condensed.

Description

Immersion type externally-tangent rotational flow type bubbler structure

Technical Field

The invention relates to the technical field of test control, in particular to an immersion type externally-tangent rotational flow bubbler structure.

Background

The bubbler is an important part of a nuclear power special safety facility. In a pressure-restraining containment vessel of a boiling water reactor, a bubbler is utilized to disperse and discharge steam entering the containment vessel under accident conditions into a pressure-restraining pool; in an automatic pressure relief system for a pressurized water reactor, a bubbler is used to dispersively discharge steam from a reactor pressurizer into an internal displacement feed water tank. In these typical applications, the bubbler is typically submerged in a pool of subcooled water to disperse the upstream vapor into the subcooled water. The bubbler structure plays an important role in increasing the contact area of steam and supercooled water, enhancing the steam condensation effect and reducing pressure pulse generated when bubbles are annihilated, and is an important component for inhibiting the pressure rise of a containment and protecting the safety and integrity of a system.

Conventional bubbler configurations typically employ small orifices in the barrel or branch bubbler arm which together act to disperse the vapor by dividing the continuous vapor into discrete small-orifice jets, but the radial shape of the vapor jets has a relatively limited area of influence on the surrounding fluid.

Disclosure of Invention

The invention aims to provide an immersion type externally-tangent rotational flow type bubbler structure, which solves the problems of small action area of jet steam and surrounding fluid and poor heat exchange effect caused by a conventional bubbler structure.

The invention is realized by the following technical scheme:

the utility model provides an circumscribed spiral-flow type bubbler structure of immersion, includes the barrel, barrel one end is the open end, and the other end forms the blind end through the low head, the outer wall of barrel is provided with a plurality of and the inside bubbling pipe that communicates of barrel, and a plurality of bubbling pipes are evenly laid along barrel circumference, and the central line of bubbling pipe is tangent with the inscribed circle of barrel.

The inlet end of the bubbling tube is connected with the outer wall of the cylinder body, the shape of the inlet end is matched with the shape of the bubbling holes in the outer wall of the cylinder body, the outlet end of the bubbling tube is matched with surrounding fluid, and the outlet end is of a tubular structure.

The working principle of the invention is as follows:

after steam enters the cylinder body, the steam is pushed to flow out of the bubbler through the bubbling pipe under the action of steam pressure; the bubbling pipe is arranged in a circle along the tangential direction, so that the outflow steam generates circumferential rotating motion, namely, the outflow steam moves along the radial direction while moves along the circumferential direction; due to the jet flow effect of the steam, part of the steam is condensed into a liquid phase, and part of the steam and the non-condensable gas continue to move spirally, so that the liquid around the bubbler is pushed to generate rotary motion, the distribution and mixing of the liquid are promoted, the action area of the steam and the supercooled fluid is increased, and the steam is favorably and effectively condensed.

In summary, the outer wall of the cylinder body is provided with the plurality of bubbling pipes communicated with the inside of the cylinder body, the plurality of bubbling pipes are uniformly distributed along the circumferential direction of the cylinder body, the center lines of the bubbling pipes are tangent to the inscribed circle of the cylinder body, the rotation and mixing of surrounding fluid are promoted, the heat exchange between the fluid and steam is enhanced, the optimization of the interaction between the steam and the surrounding fluid is realized, the action area between jet steam and the surrounding fluid can be effectively increased, the heat exchange effect of direct contact condensation is enhanced, the rapid, stable and effective condensation of the steam is facilitated, and the safety of a system is enhanced.

Further, a plurality of bubbling pipes at least distribute 2 layers along the axial of barrel, and every layer includes a plurality of bubbling pipes, and a plurality of bubbling pipes are evenly laid along barrel circumference and are formed the annular array.

Preferably, the spacing between axially adjacent 2 bubble tubes is equal to the spacing between axially adjacent 2 bubble tubes.

The multilayer bubbling pipe can also be regarded as being arranged on the outer wall of the cylinder body in a circle.

Further, the aperture of the bubbling tube is 30-35 mm.

Preferably, the end of the bubbling tube is in an everted rounded configuration.

The tail end specifically refers to the outlet end of the bubbling pipe, and the inverted round structure is favorable for steam in the bubbling pipe to be sprayed out.

Further, still include inlet tube and reducing head, the internal diameter of inlet tube is less than the internal diameter of barrel, the inlet tube passes through reducing head and is connected with the open end of barrel.

The inlet tube is the inlet port of steam, makes in steam gets into the barrel from upper portion inlet tube, and the internal diameter of inlet tube is less than the internal diameter of barrel, and steam diffuses fast to the barrel in after the reducing head buffering.

The arrangement is favorable for steam to enter the cylinder body quickly.

Further, the inner diameter of the reducing head tends to increase gradually from the end connected with the inlet pipe to the other end.

Further, the thickness of inlet pipe, reducing head and barrel is unanimous.

Further, the lower end socket is an elliptical end socket.

The lower end enclosure is a main steam collecting area, and the elliptical end enclosure is adopted to facilitate steam collecting.

Compared with the prior art, the invention has the following advantages and beneficial effects:

according to the invention, the plurality of bubbling pipes communicated with the interior of the cylinder are arranged on the outer wall of the cylinder, the plurality of bubbling pipes are uniformly distributed along the circumferential direction of the cylinder, and the center lines of the bubbling pipes are tangent to the inscribed circle of the cylinder, so that the rotation and mixing of surrounding fluid are promoted, the heat exchange between the fluid and steam is enhanced, the optimization of the interaction between the steam and the surrounding fluid is realized, the action area between jet steam and the surrounding fluid can be effectively increased, the heat exchange effect of direct contact condensation is enhanced, the rapid, stable and effective condensation of the steam is facilitated, and the safety of a system is enhanced.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:

FIG. 1 is an isometric view of an immersed circumscribed cyclonic bubbler structure;

FIG. 2 is a front view of a submerged circumscribed cyclonic bubbler structure;

fig. 3 is a top view of an in-type external swirl bubbler structure.

Reference numbers and corresponding part names in the drawings:

1-inlet pipe, 2-reducing head, 3-cylinder and 4-bubbling pipe.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.

Example 1:

as shown in fig. 1-3, an immersion type circumscribed spiral-flow type bubbler structure, includes barrel 3, 3 one end of barrel is the open end, and the other end passes through the low head and forms the blind end, its characterized in that, the outer wall of barrel 3 is provided with a plurality of and 3 inside intercommunication's of barrel bubbling pipe 4, and a plurality of bubbling pipe 4 evenly lay along 3 circumference of barrel, specifically, a plurality of bubbling pipe 4 along the axial distribution 6 layers of barrel 3, every layer includes 6 bubbling pipe 4, and 6 bubbling pipe 4 evenly lay along 3 circumference of barrel and form annular array, and the central line of bubbling pipe 4 is tangent with the inscribed circle of barrel 3.

In the embodiment, after steam enters the cylinder 3, the steam is pushed to flow out of the bubbler through the bubbling tube 4 under the action of steam pressure; because the bubbling pipe 4 is arranged in a circle along the tangential direction, the outflow steam generates circumferential rotating motion, namely, the outflow steam moves along the radial direction and moves along the circumferential direction; due to the jet flow effect of the steam, part of the steam is condensed into a liquid phase, and part of the steam and the non-condensable gas continue to move spirally, so that the liquid around the bubbler is pushed to generate rotary motion, the distribution and mixing of the liquid are promoted, the action area of the steam and the supercooled fluid is increased, and the steam is favorably and effectively condensed.

Example 2:

as shown in fig. 1-3, the present embodiment is based on embodiment 1, and further comprises an inlet pipe 1 and a reducing head 2, wherein the inner diameter of the inlet pipe 1 is smaller than the inner diameter of the cylinder 3, and the inlet pipe 1 is connected with the open end of the cylinder 3 through the reducing head 2; the inner diameter of the reducing head 2 gradually increases from one end connected with the inlet pipe 1 to the other end; the inlet pipe 1, the reducing head 2 and the cylinder 3 are consistent in thickness.

In the embodiment, steam enters through the inlet pipe 1, enters the cylinder 3 after being buffered by the reducing head 2, and pushes the steam to flow out of the bubbler through the bubbling pipe 4 under the action of steam pressure.

Example 3:

as shown in fig. 1 to 3, in the present embodiment based on embodiment 1 or embodiment 2, the diameter of the bubble tube 4 is 30 to 35 mm; the tail end of the bubbling tube 4 adopts an outward-turning round structure; the lower end enclosure is an elliptical end enclosure.

The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. The utility model provides an immersible circumscribed spiral-flow type bubbler structure, includes barrel (3), barrel (3) one end is the open end, and the other end forms the blind end through the low head, its characterized in that, the outer wall of barrel (3) is provided with a plurality of and barrel (3) inside intercommunication bubble pipe (4), and a plurality of bubble pipe (4) are evenly laid along barrel (3) circumference, and the central line of bubble pipe (4) is tangent with the inscribed circle of barrel (3).

2. An immersed circumscribed cyclonic bubbler structure according to claim 1, wherein the plurality of bubbling tubes (4) are distributed in at least 2 layers along the axial direction of the cartridge (3), each layer comprising a plurality of bubbling tubes (4), the plurality of bubbling tubes (4) being uniformly arranged in a circumferential direction of the cartridge (3) to form an annular array.

3. An immersed external swirl bubbler structure according to claim 1 wherein the bore diameter of the bubbler tube (4) is 30-35 mm.

4. An immersed circumscribed cyclonic bubbler structure according to claim 1 further comprising an inlet tube (1) and a reducing head (2), the inner diameter of the inlet tube (1) being smaller than the inner diameter of the cartridge (3), the inlet tube (1) being connected to the open end of the cartridge (3) through the reducing head (2).

5. An immersed external swirl bubbler structure according to claim 4 wherein the inside diameter of the reducing head (2) gradually increases from one end connected to the inlet pipe (1) to the other end.

6. An immersed external swirl bubbler structure according to claim 4 wherein the inlet tube (1), the reducing head (2) and the barrel (3) are of uniform thickness.

7. The submerged external cyclone bubbler structure according to any one of claims 1-6, wherein the lower head is an elliptical head.