CN219252094U

CN219252094U - U-shaped pipe multistage demister

Info

Publication number: CN219252094U
Application number: CN202221094124.7U
Authority: CN
Inventors: 张建国; 张丽; 洪欢喜; 杨振军
Original assignee: Zhongneng Green Technology Shanghai Technology Co ltd
Current assignee: Zhongneng Green Technology Shanghai Technology Co ltd
Priority date: 2022-05-09
Filing date: 2022-05-09
Publication date: 2023-06-27
Anticipated expiration: 2032-05-09

Abstract

The utility model discloses a U-shaped pipe multistage demister, which comprises: the U-shaped pipe body comprises a first pipe section, a bent pipe section and a second pipe section which are sequentially connected, wherein the first pipe section is a horizontal straight pipe section, the end part of the first pipe section is provided with a gas inlet, the second pipe section comprises a horizontal straight pipe section, an upward-inclined pipe section and a vertical pipe section which are sequentially connected, and the top end of the vertical pipe section is a gas outlet; the defoaming filter screen comprises a first defoaming filter screen, a second defoaming filter screen and a third defoaming filter screen, the mesh numbers of the second defoaming filter screen, the third defoaming filter screen and the first defoaming filter screen are sequentially reduced, the first defoaming filter screen is arranged in the first pipe section and located at the downstream of the gas inlet, the second defoaming filter screen is arranged in the bent pipe section, and the third defoaming filter screen is arranged in the vertical pipe section. The demister provided by the utility model has a simple and compact structure, and can consider the influence of demisting efficiency and flow resistance.

Description

U-shaped pipe multistage demister

Technical Field

The utility model relates to the field of refrigeration equipment, in particular to a U-shaped pipe multi-section demister.

Background

In absorption refrigeration systems, a demister is connected in series between the generator and the condenser for separating entrained droplets from the refrigerant vapor. The existing vertical or horizontal demister is large in size design, complex in structure and difficult to consider the influence of defoaming efficiency and flow resistance.

Disclosure of Invention

In view of the above drawbacks of the prior art, it is at least an object of the present utility model to provide a demister that is simple and compact in structure and that is capable of achieving both demisting efficiency and flow resistance effects.

The utility model provides a U-shaped pipe multistage demister, which comprises:

the U-shaped pipe body comprises a first pipe section, a bent pipe section and a second pipe section which are sequentially connected, wherein the first pipe section is a horizontal straight pipe section, the end part of the first pipe section is provided with a gas inlet, the second pipe section comprises a horizontal straight pipe section, an upward-inclined pipe section and a vertical pipe section which are sequentially connected, and the top end of the vertical pipe section is a gas outlet;

the defoaming filter screen, the defoaming filter screen is including first defoaming filter screen, second defoaming filter screen and third defoaming filter screen of including in proper order, second defoaming filter screen, third defoaming filter screen and first defoaming filter screen's mesh reduces in proper order, first defoaming filter screen sets up in the first pipeline section, be located the low reaches of gas inlet, the second defoaming filter screen sets up in the curved pipe section, the third defoaming filter screen sets up in the vertical pipeline section.

Optionally, the mesh number of the first defoaming filter screen is within 30 meshes, the mesh number of the second defoaming filter screen is between 400 and 600 meshes, and the mesh number of the third defoaming filter screen is between 80 and 120 meshes.

Optionally, the mesh number of the first defoaming filter screen is 20 mesh, the mesh number of the second defoaming filter screen is 500 mesh, and the mesh number of the third defoaming filter screen is 100 mesh.

Optionally, the gas inlet is located at the bottom side of the first pipe section.

Optionally, the included angle between the inclined pipe section and the horizontal direction is 8 ° -15 °.

Optionally, the included angle between the inclined pipe section and the horizontal direction is 10 °.

Optionally, a gap serving as a liquid reflux area is reserved between the first defoaming filter screen and/or the second defoaming filter screen and the bottom of the U-shaped pipe body.

The utility model has the following beneficial effects:

the utility model provides a U type pipe multistage demister carries out three-section to the refrigerant steam that comes from gas inlet and removes the foam, and first section adopts the mesh relatively less filter screen, filters the great liquid drop that comes from gas, and the second section sets up in U type pipe bend department, utilizes the shearing force and the centrifugal force of bend section to remove the foam to adopt the mesh relatively higher filter screen, be used for filtering most liquid drops, the third section adopts the mesh relatively less filter screen, and with the help of gravity and centrifugal force effect, residual liquid drop in the filtration air current. The three-section defoaming device with the combination of the thickness is simple and compact in structure and has the effects of defoaming efficiency and flow resistance.

The U-shaped pipe rear end department adopts slope pipe, vertical pipe cooperation filter screen's form, is convenient for remove the backward flow of foam back liquid droplet, is convenient for simultaneously form the buffering to the ascending flow of air current, reduces the resistance influence of vertical direction, more effectively gets rid of the attachment that is mingled with in the gas, plays the effect of reinforcement filtration separation, improves the purity of handling gas.

The above, as well as additional objectives, advantages, and features of the present utility model will become apparent to those skilled in the art from the following detailed description of a specific embodiment of the present utility model when read in conjunction with the accompanying drawings.

Drawings

Some specific embodiments of the utility model will be described in detail hereinafter by way of example and not by way of limitation with reference to the accompanying drawings. The same reference numbers will be used throughout the drawings to refer to the same or like parts or portions. It will be appreciated by those skilled in the art that the drawings are not necessarily drawn to scale. In the accompanying drawings:

fig. 1 is a top view of a U-tube multi-stage demister according to an embodiment of the present utility model.

Fig. 2 is an elevation view of the U-tube multi-segment demister of fig. 1 at the rear end of a second tube segment.

Fig. 3 is a right side view of the U-tube multi-segment demister shown in fig. 1.

Fig. 4 is a cross-sectional view of a first despumation screen perpendicular to the direction of airflow in one embodiment of the utility model.

Fig. 5 is a cross-sectional view of a second despumation screen perpendicular to the direction of airflow in one embodiment of the utility model.

Fig. 6 is a cross-sectional view of a third demister screen perpendicular to the direction of gas flow in one embodiment of the present utility model.

Reference numerals:

the device comprises a U-shaped pipe body 1, a gas inlet 2, a first defoaming filter screen 3, a second defoaming filter screen 4, a third defoaming filter screen 5, a gas outlet 6, a vertical pipe section 7 and a liquid backflow area 8.

Detailed Description

It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other. The utility model will be described in detail below with reference to the drawings in connection with embodiments.

Fig. 1 and 2 show an embodiment of the U-tube multi-stage demister according to the utility model, wherein the demister comprises a U-tube body 1 and a demister screen.

The U-shaped pipe body 1 comprises a first pipe section, a bent pipe section and a second pipe section which are connected in sequence. The first pipe section is a horizontal straight pipe section, the end of the first pipe section is provided with a gas inlet 2, the gas inlet 2 can be directly arranged at the end of the first pipe section, preferably at the bottom side of the first pipe section, or the end of the first pipe section is communicated with a downward inlet pipe, and the inlet of the inlet pipe is taken as the gas inlet 2 (shown in fig. 3). As shown in fig. 2, the second pipe section comprises a horizontal straight pipe section, an upward inclined pipe section and a vertical pipe section 7 which are connected in sequence, and the top end of the vertical pipe section is a gas outlet 6. The upward-inclined pipe section and the horizontal direction form a certain included angle so as to facilitate the backflow of liquid drops after defoaming, and simultaneously facilitate the buffering of upward flow of air flow and reduce the resistance influence in the vertical direction. The angle is preferably in the range of 8 ° -15 °, in particular 10 ° in this embodiment. To facilitate the connection of the demister to the downstream pipe, the pipe diameter of the vertical pipe section 7 may be designed as shown in fig. 3 to be smaller than the pipe diameters of the Yu Shuiping straight pipe section and the upward-inclined pipe section.

The defoaming filter screen is arranged in the U-shaped pipe body 1 and sequentially comprises a first defoaming filter screen 3, a second defoaming filter screen 4 and a third defoaming filter screen 5. The mesh numbers of the second defoaming screen 4, the third defoaming screen 5 and the first defoaming screen 3 are sequentially reduced. The first defoaming filter screen 3 adopts a filter screen with relatively smaller mesh number, is arranged in the first pipe section and is positioned at the downstream of the gas inlet 2, and is preferably a filter screen with mesh number within 30 mesh, the embodiment specifically adopts a 20-mesh filter screen, the second defoaming filter screen 4 adopts a filter screen with relatively higher mesh number, is arranged in the bent pipe section, and is preferably a filter screen with mesh number between 400 and 600 mesh, the embodiment specifically adopts a 500-mesh filter screen, the third defoaming filter screen 5 adopts a filter screen with relatively smaller mesh number, is arranged in the vertical pipe section of the second pipe section, and is preferably a filter screen with mesh number between 80 and 120 mesh, and the embodiment specifically adopts a 100-mesh filter screen. The first defoaming filter screen is used for filtering larger liquid drops from gas, the second defoaming filter screen is used for filtering most liquid drops by adopting a high-mesh filter screen and simultaneously utilizing the combined action of shearing force and centrifugal force of the gas flow on the bent pipe section, and the third defoaming filter screen is used for blocking the liquid drops still remained in the gas flow, so that the liquid drops fall under the action of gravity and centrifugal force to play a role in reinforcing, filtering and separating.

The third demister screen fills the entire inner diameter of the vertical pipe section as shown in fig. 6, and the first and second demister screens may also fill the entire inner diameter of the pipe section, or, as shown in fig. 4 and 5, a gap is left between the screen and the bottom of the pipe section as a liquid recirculation zone 8 to facilitate recirculation of separated liquid droplets.

The working principle of the demister is as follows:

the refrigerant steam enters the demister (namely enters the U-shaped pipe body 1) from the gas inlet 2, passes through the first demister filter screen after entering the demister, larger particle attachments in the steam are demisted and filtered, and the air flow continues to flow forwards along with the pipeline and then passes through the second demister filter screen. Because the second defoaming filter screen is arranged on the bent pipe section of the U-shaped pipe body 1, the airflow is turned along with the U-shaped pipe body 1, steam is continuously extruded in a staggered way, the airflow also has a certain pressure, and a shearing force is generated under the staggered extrusion; when extrusion shearing occurs, centrifugal separation can also occur due to the structural form of the arc bent pipe of the bent pipe section, namely, centrifugal force and shearing force are applied simultaneously, and the two forces jointly meet, so that small particle attachments in steam can be efficiently separated at a relatively high flow rate, and very high mist separation efficiency is achieved. After separation through the bend, steam will enter the second tube section and flow out of the gas outlet 6 through the horizontal straight, inclined and vertical tube sections of the second tube section. The steam here climbs and turns around, and the attachments therein pass through the third defoaming filter screen to be blocked, are easier to defoam and separate again under the combined action of gravity and centrifugal force, and finally fall into the pipe under the action of gravity, so that purer steam is obtained.

The present utility model is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present utility model are intended to be included in the scope of the present utility model. Therefore, the protection scope of the present utility model should be subject to the protection scope of the claims.

Claims

1. A U-tube multi-segment demister comprising:

2. The U-tube multi-section demister of claim 1, wherein:

the mesh number of the first defoaming filter screen is within 30 meshes, the mesh number of the second defoaming filter screen is between 400 and 600 meshes, and the mesh number of the third defoaming filter screen is between 80 and 120 meshes.

3. The U-tube multi-section demister of claim 2, wherein:

the mesh number of the first defoaming filter screen is 20 meshes, the mesh number of the second defoaming filter screen is 500 meshes, and the mesh number of the third defoaming filter screen is 100 meshes.

4. The U-tube multi-section demister of claim 1, wherein:

the gas inlet is located at the bottom side of the first pipe section.

5. The U-tube multi-section demister of claim 1, wherein:

the included angle between the upward-inclined pipe section and the horizontal direction is 8-15 degrees.

6. The U-tube multi-section demister of claim 5, wherein:

the included angle between the upward-inclined pipe section and the horizontal direction is 10 degrees.

7. The U-tube multi-section demister of claim 1, wherein:

and a gap serving as a liquid reflux area is reserved between the first defoaming filter screen and/or the second defoaming filter screen and the bottom of the U-shaped pipe body.