CN210009641U - Overflow tangential groove type pipe orifice film distributor - Google Patents

Abstract

The utility model discloses an overflow tangential groove type pipe orifice film distributor, which is arranged at the upper end of the pipe orifice of a heat exchange pipe, and is of a tubular structure, and the cross section of the film distributor is circular; a plurality of tangential ports are arranged on the same horizontal plane of the tube wall of the film distributor; the opening of the tangential port is in a rectangular groove shape; and a step-shaped positioning concave platform is arranged at the contact position of the lower end of the film distributor and the pipe orifice of the heat exchange pipe. When the liquid flows into the film distributor when flowing across the cut, the liquid can rapidly flow upwards on the inner wall of the heat exchange tube to form a complete and uniform liquid film under the action of centrifugal force and gravity, and the heat exchange efficiency of the falling film in the tube can be effectively improved. Compare in traditional cloth membrane ware, this novel cloth membrane ware has cloth membrane effect fine, advantage such as the elasticity is great.

Description

Overflow tangential groove type pipe orifice film distributor

Technical Field

The utility model relates to a belong to mechanical device design field, concretely relates to be arranged in the vertical intraductal falling film evaporation ware that uses in trades such as oil, chemical industry, food, pharmacy and sea water desalination.

Background

The vertical tube falling-film evaporator eliminates the problem of effective heat transfer temperature difference loss caused by static pressure, has the advantages of large concentration ratio, wide viscosity range, small pressure drop, good heat transfer effect, large treatment capacity and the like, is suitable for treating heat-sensitive liquid, and can be used in a multi-effect evaporation system. Therefore, the method is widely applied to the industries of chemical engineering, light industry, food, pharmacy, metallurgy, seawater desalination and the like.

Whether the liquid distribution device is reasonable or not and whether the corresponding liquid distribution is uniform or not directly influence the heat transfer efficiency and the operation stability of the falling film evaporator, and the dry wall phenomenon is a phenomenon that a liquid film is broken and a film-shaped liquid flow is changed into a flocculent liquid flow which often occurs in the falling film evaporator due to non-uniform distribution, so that the heat exchange is deteriorated and even a tube is burnt out. In order to prevent the 'dry wall' phenomenon from influencing the heat transfer of the falling-film evaporator, a reasonable liquid distribution device is designed in the falling-film evaporator, and a film distributor which can uniformly distribute feed liquid into each downcomer and uniformly distribute films along the periphery of the downcomer is developed, so that the working performance of the falling-film evaporator is directly influenced.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide an overflow slot type mouth of pipe film distributor of simple structure, divide liquid even, difficult jam. The film distributor is low in manufacturing cost, simple in structure, convenient to disassemble and assemble and good in market application prospect.

The technical scheme of the utility model is that the overflow groove type pipe orifice film distributor is arranged at the upper end of the pipe orifice of the heat exchange pipe, the film distributor is of a tubular structure, and the cross section is circular; a plurality of tangential ports are arranged on the same horizontal plane of the tube wall of the film distributor; the opening of the tangential port is in a rectangular groove shape; and a step-shaped positioning concave platform is arranged at the contact position of the lower end of the film distributor and the pipe orifice of the heat exchange pipe.

The rectangular trench is rectangular in front view. The tangential port is communicated with the inner pipe wall and the outer pipe wall of the film distributor.

Wherein, the opening shape of the tangential port is an oblique rectangular groove. The action of which causes the liquid to be distributed in a swirling manner in the tube. The tangential ports are oblique rectangular grooves. When the liquid flows into the inner surface of the pipe through the cut in the tangential direction, tangential speed is generated, which is beneficial to the uniform distribution of the liquid film. The tangential holes are only one layer, and the distribution quantity is set according to different operation conditions.

Further, the tangential ports are evenly distributed on the same horizontal plane. The function of which is to distribute the liquid evenly in the tube.

Wherein, the number of the tangential ports is 4-8. Different quantities are set according to the flow demand of the heat exchange pipe.

Wherein, the tangential port opening angle is 30-60 degrees. I.e. in cross-section the centre line of the said tangential port is at an angle to the tangent intersecting the centre line, or in cross-section the centre line of the groove is at an angle to the diameter of the circle, preferably 30-60 deg.. The angle is selected according to the requirements of physical tension and viscosity.

Wherein, the film distributor is positioned above the heat exchange tube. Thus being convenient for the vertical installation of the film distributor.

Wherein the wall thickness of the tube of the film distributor is 3-5 mm.

Wherein, the inner wall of the lower end pipe orifice of the film distributor is provided with an oblique angle which is an acute angle. The longitudinal section is cut in an acute angle, so that liquid is quickly connected when flowing from the film distributor to the heat exchange tube.

Furthermore, the horizontal section of the bottom end of the bevel angle is provided with a straight side section of 0.2-0.3 mm.

Further, the oblique angle is 10 ~ 20.

Wherein, the film distributor is positioned above the stepped steps.

The lower end of the pipe orifice film distributor is inserted into the upper end port of the heat exchange pipe, and the outer diameter of the lower end of the film distributor is matched with the inner diameter of the heat exchange pipe. The film distributor is provided with step-shaped steps and is used for positioning during installation.

Has the advantages that:

the utility model discloses an overflow tangential ditch groove formula mouth of pipe film distributor is a liquid distributor that divides liquid even, simple structure, difficult jam, and tangential film distributor can make liquid along the rotatory flow of pipe wall, makes the liquid film even easily on the one hand, and on the other hand rotatory liquid is difficult for taking place the flooding and liquid and smugglies secretly owing to the effect of centrifugal force, has the effect of strengthening the heat transfer.

Drawings

Fig. 1 is a schematic view of the vertical evaporation overflow tangential groove type pipe orifice film distributor of the present invention.

Fig. 2 is an enlarged view of the oblique angle part of the pipe orifice film distributor of the utility model.

Fig. 3 is an installation schematic diagram of the pipe orifice film distributor and the heat exchange pipe of the present invention.

Fig. 4 is a schematic view of the tangential port of the pipe orifice film distributor of the present invention.

In the figure: 1-film distributor, 2-tangential port, 3-positioning concave table, 4-straight edge section, 5-tube plate and 6-heat exchange tube.

Detailed Description

The following describes in further detail embodiments of the present invention with reference to the accompanying drawings.

As shown in fig. 1, a novel overflow type pipe orifice film distributor for vertical falling film is processed by using 304L or 316L stainless steel pipes according to different pipe pass liquid properties. The processing method is to process a tangential rectangular groove on the wall of the stainless steel pipe, and the wall thickness of 1 part of the wall of the stainless steel pipe is usually 3-5 mm. Novel film distributor 1 inserts on heat exchanger tube sheet 5 during the use, and novel film distributor 1 lower extreme has notch cuttype location concave station 2 for the fixed depth of insertion position when installing, inserts under the heat exchange tube 6 tip and separately has the oblique angle, and the oblique angle bottom has 0.2 ~ 0.3mm straight side section 4 (see figure 2), and the oblique angle helps the smooth transition of tube side liquid from film distributor 1 to heat exchange tube inner wall, more is favorable to the filming.

The tangential port 3 on the film distributor is a tube side liquid inlet, when the liquid level above the tube plate 5 submerges the tangential port 3, the liquid starts to enter the heat exchange tube through the tangential port 3, a stable and uniform liquid film is formed on the inner wall under the action of tangential speed, and the height and width of the tangential port 3, the number of openings and the height of the openings of the tangential port in the film distributor are determined by the flow of a falling film reboiler.

In a preferred embodiment, the number of the tangential opening openings of the novel pipe orifice film distributor is 4, and the 4 tangential openings are uniformly distributed at intervals of 90 degrees along the circumference.

In another preferred embodiment, the number of the tangential openings of the novel pipe orifice film distributor is 6, and the 6 tangential openings are uniformly distributed at intervals along the circumference. The tangential port opening angle is 45 ° (see fig. 4).

In another embodiment, the novel pipe orifice membrane distributor is inserted above the pipe plate as shown in fig. 3, and is positioned by a positioning concave table 2 generated during the processing of the membrane distributor, and the outer diameter of the lower end of the membrane distributor is matched with the inner diameter of the heat exchange pipe.

Tests in experiments and use show that the utility model has simple structure, convenient installation and easy processing. The tangential hole film distributor can enable liquid to generate tangential speed along the pipe wall, so that the liquid film is uniformly distributed, and the rotating liquid is not easy to flood and carry with the liquid due to the action of centrifugal force, so that the effect of falling film evaporation is more excellent.

Claims (10)

1. The utility model provides an overflow tangential slot type mouth of pipe film distributor, film distributor installs in heat exchange tube mouth of pipe upper end, its characterized in that: the film distributor is of a tubular structure, and the cross section of the film distributor is circular; a plurality of tangential ports are arranged on the same horizontal plane of the tube wall of the film distributor; the opening of the tangential port is in a rectangular groove shape; and a step-shaped positioning concave platform is arranged at the contact position of the lower end of the film distributor and the pipe orifice of the heat exchange pipe.

2. The overflow tangential groove-type orifice film distributor of claim 1, wherein the opening of the tangential orifice is in the shape of an oblique rectangular groove.

3. The overflow tangential groove type pipe orifice film distributor according to claim 1 or 2, which is characterized in that: the tangential ports are uniformly distributed on the same horizontal plane.

4. The overflow tangential groove type pipe orifice film distributor according to claim 1 or 2, which is characterized in that: the number of the tangential ports is 4-8.

5. The overflow tangential groove type pipe orifice film distributor of claim 2, wherein: the opening angle of the tangential port is 30-60 degrees.

6. The overflow tangential trench nozzle film distributor of claim 1, wherein: the film distributor is positioned above the heat exchange tube.

7. The overflow tangential groove type pipe orifice film distributor of claim 1, which is characterized in that: the wall thickness of the tube of the film distributor is 3-5 mm.

8. The overflow tangential groove type pipe orifice film distributor of claim 1, which is characterized in that: the inner wall of the lower end pipe orifice of the film distributor is provided with an oblique angle, and the oblique angle is an acute angle.

9. The overflow tangential groove type orifice film distributor of claim 8, wherein: the horizontal section of the oblique angle bottom end is provided with a straight edge section of 0.2-0.3 mm.

10. The overflow tangential groove type orifice film distributor of claim 8, wherein: the oblique angle is 10 ~ 20.

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