CN209865334U - Vertical falling film porous injection type liquid distribution device - Google Patents
Vertical falling film porous injection type liquid distribution device Download PDFInfo
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- CN209865334U CN209865334U CN201920420183.0U CN201920420183U CN209865334U CN 209865334 U CN209865334 U CN 209865334U CN 201920420183 U CN201920420183 U CN 201920420183U CN 209865334 U CN209865334 U CN 209865334U
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Abstract
The utility model discloses a vertical falling film porous jet type liquid distribution device, which comprises a heat exchange tube and a tube plate connected with the heat exchange tube, wherein a film distributor is arranged above the heat exchange tube and comprises a liquid separator and a film distributor below the liquid separator, and a support distance bolt is connected with the liquid separator and the tube plate; the liquid distributor is provided with a liquid distribution hole; the cross section of the film distributor is circular, the upper end of the film distributor is not provided with an end cover, and the bottom of the film distributor is sealed by the end cover; a plurality of small holes are formed in the same horizontal plane of the pipe wall at the lower end of the film distributor; the diameter of the film distributor decreases in a step-like manner, and the diameters of the film distributor are divided into an upper section, a middle section and a lower section which decrease in sequence; the diameter of the maximum part of the diameter of the upper end is larger than the inner diameter of the heat exchange pipe, and a gap is reserved between the minimum part of the diameter of the bottom and the inner wall of the heat exchange pipe. The utility model also discloses a liquid distribution method and the application of this cloth membrane ware. The film distributor has the characteristics of simple manufacture, convenient installation and the like. Therefore, the high-efficiency liquid distribution method has wide application prospect.
Description
Technical Field
The utility model relates to a chemical industry equipment field belongs to the heat exchanger category, in particular to high-efficient falling liquid film evaporator liquid distribution device of polyisobutene device.
Background
Polyisobutylene is an important chemical product, and the production and sale of polyisobutylene are monopolized abroad for a long time. The heat exchange equipment plays an important role in the production process, and has remarkable significance for breaking through the monopoly of foreign production and sales and improving the heat exchange efficiency of the heat exchange equipment.
Falling film evaporation is a novel high-efficiency heat transfer technology and has the following advantages:
(1) the heat transfer coefficient is higher, even if the temperature difference between the evaporated liquid and the heating medium is smaller, the heat transfer coefficient is still higher;
(2) the retention time is short, the effect is very obvious for heat-sensitive materials, and the materials are not decomposed;
(3) the heat loss is small, and multiple-effect operation can be realized in practical application;
(4) the pressure drop is small, and the temperature and the pressure on the process application side of the evaporator are almost constant, so that the use amount of sensible heat can be reduced, and the effect of saving energy is achieved;
(5) scaling is not easy to occur in the evaporation process;
(6) the falling film evaporation process is an evaporation mode which is driven to be carried out under the action of gravity, high temperature difference is not needed, and the process can be carried out under the action of small temperature difference in the aspect of economy.
The falling film evaporation has the characteristics, so that the falling film evaporation technology is widely applied to the production process of various chemical products, is particularly suitable for treating working media with high viscosity, and has a viscosity range of 50-450 cp, thereby having a good effect on treating polyisobutylene.
The liquid distributor enables liquid in the heat exchange equipment to be distributed and flow more uniformly, wherein the pipe orifice film distributor can ensure that liquid in the pipe forms a film and flows, the heat transfer effect is improved, and the pipe orifice film distribution device of the evaporator in the efficient polyisobutene production can be developed to obviously improve the pipe pass heat transfer efficiency.
SUMMERY OF THE UTILITY MODEL
Therefore, the to-be-solved technical problem of the utility model is to improve the heat exchange efficiency of evaporimeter in the polyisobutene production, provide a simple structure, make the installation convenient, liquid cloth membrane is effectual, heat transfer efficiency is high, the difficult vertical falling liquid film evaporation liquid distribution device who blocks up.
The technical scheme of the utility model is that, a vertical falling film porous jet type liquid distribution device, comprises a heat exchange tube and a tube plate connected with the heat exchange tube, a film distributor is arranged above the heat exchange tube, and comprises a liquid distributor 1 with a round cross section, a film distributor 2 arranged below the liquid distributor 1, and a supporting distance bolt 4 connected between the liquid distributor 1 and the tube plate 3;
the liquid distributor 1 is provided with a plurality of liquid distribution holes; the cross section of the film distributor 2 is circular, the upper end of the film distributor is not provided with an end cover, and the bottom of the film distributor is sealed by the end cover; a plurality of small holes are formed in the same horizontal plane of the pipe wall at the lower end of the film distributor 2; the diameter of the film distributor 2 is gradually reduced in a step shape, and the diameters of the upper section, the middle section and the lower section are sequentially reduced; the maximum diameter of the upper end is larger than the inner diameter of the heat exchange tube 5, and a gap is reserved between the minimum diameter of the bottom and the inner wall of the heat exchange tube; the position with the largest diameter is positioned outside the heat exchange pipe.
The distance between the small hole and the bottom of the film distributor 2 depends on the material property;
the diameter of the film distributor 2 decreases progressively in a step shape, namely, the diameter of the upper end is the largest, the diameter of the middle is the next largest, and the diameter of the bottom is the smallest.
Preferably, the liquid distribution holes on the liquid distributor are uniformly arranged.
Wherein, the film distributor 2 is arranged on the heat exchange tube 5 by interference fit. The film distributor 2 and the heat exchange tube 5 are in interference fit.
Wherein the small holes are uniformly distributed on the same radial plane. Further, the number of the radial small holes is 4-8. More preferably, the aperture is a circular hole.
Wherein, the distance between the minimum diameter position of the bottom of the film distributor 2 and the inner wall of the heat exchange tube 5 is 0.6-1.8 mm.
More preferably, the distance between the minimum diameter position of the bottom of the film distributor 2 and the inner wall of the heat exchange tube 5 is 0.8-1.2 mm.
Wherein the wall thickness of the tube of the film distributor is 1-3 mm.
Wherein, a notch is arranged on the pipe wall port at the upper end of the film distributor 2. Further, the number of the notches is two. More preferably, the two notches are symmetrically arranged.
Preferably, the heat exchange tube 5 and the tube plate 3 are connected by welding.
Through practice and inspection, compared with the traditional film distributor, the designed film distributor has the advantages that the novel film distributor cannot be blocked, and materials can uniformly and stably flow in a film shape along the wall of the heat exchange pipe. The film distributor of the utility model is different from other existing film distributors, when liquid passes through the round hole at the bottom of the film distributor, the liquid can be rapidly sprayed to the heat exchange tube for film distribution, no dry wall transition area exists, the film distribution is uniform, the film distributor can be better adapted to the heat exchange tube in the falling film evaporator, and the performance requirement and the use requirement of the falling film evaporator are met; the film distributor is simple in structure, the positioning boss of the film distributor ensures the mounting verticality and the height of the film distributor with the heat exchange tube, so that liquid stably enters the heat exchange tube through the round hole of the film distributor, a liquid transition area does not exist in the heat exchange tube, and the dry wall phenomenon cannot occur.
The wall surface of the tube wall at the bottom of the film distributor is provided with a plurality of small holes, and liquid flows out through the small holes and is sprayed to the heat exchange tube to form films and flow down.
Has the advantages that:
the utility model discloses a vertical porous injection liquid distribution device is a liquid distribution device that divides liquid even, simple structure, difficult jam, provides a novel high-efficient liquid distribution method. After the material is sprayed through the small holes, the material can stably flow in a film shape along the inner wall of the heat exchange tube. On the other hand, the vertical surface is simpler than a horizontal hole, and the stepped concave table is arranged for positioning and better film forming effect when in installation, so the film distributor has the characteristics of simple manufacture, convenient installation and the like. Therefore, the high-efficiency liquid distribution method has wide application prospect.
Drawings
Fig. 1 is a schematic view of the novel falling film liquid distribution device of the present invention.
Fig. 2 is a schematic view of the part of the pipe orifice film distributor inserted into the heat exchange pipe.
Fig. 3 is a schematic structural view of the liquid distributor of the utility model.
In the figure: 1-a liquid separator, 2-a film distributor, 3-a tube plate, 4-a positioning screw and 5-a 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 static pressure porous jet liquid distribution device for vertical falling film comprises: the device comprises a liquid separator 1, a film distributor 2, a tube plate 3, a positioning screw 4 and a heat exchange tube 5.
The film distributor 2 is arranged above the heat exchange tube 5 and comprises a liquid separator 1, the film distributor 2 below the liquid separator, the film distributor 2 is arranged on the tube plate 3, and a supporting distance bolt 4 is connected with the liquid separator 1 and the tube plate 3;
the liquid distributor 1 is provided with a plurality of liquid distribution holes. The cross section of the film distributor 2 is circular, the upper end of the film distributor is not provided with an end cover, and the bottom of the film distributor is sealed by the end cover; a plurality of small holes are formed in the same horizontal plane of the pipe wall at the lower end of the film distributor 2; the diameter of the film distributor 2 is gradually reduced in a step shape, and the diameters of the upper section, the middle section and the lower section are sequentially reduced; the diameter of the maximum diameter part of the upper end is larger than the inner diameter of the heat exchange tube 5, and a gap is reserved between the minimum diameter part of the bottom and the inner wall of the heat exchange tube.
In a preferred embodiment, as shown in FIG. 3, the liquid distributor 1 has two layers, each layer has staggered holes, and the upper and lower layers have different hole sizes.
The stainless steel pipe is processed by using 304L or 316L stainless steel pipes according to the properties of materials in different pipe passes. The processing method is to process horizontal round holes on the wall of the stainless steel pipe, and the wall thickness of the stainless steel pipe is usually 2-3 mm. The film distributor 2 is arranged on the heat exchanger tube plate 3 in an interference fit mode, as shown in figure 2, the lower end of the novel film distributor 2 is provided with a step-type positioning concave platform, and the insertion depth position is fixed when the novel film distributor is convenient to install.
During the use material flows in film distributor 2 through the distribution of fig. 3 knockout 1, in the material flows in film distributor 2 when the liquid level is higher than the minimum height department of 2 upper end notches of film distributor on tube sheet 3, when the liquid level height in film distributor 2 is higher than the height of the round hole opened at 2 intraductal bottoms of film distributor, the material sprays the film on the heat exchange tube rapidly from the hole, flows down along 5 inner walls of heat exchange tube, thereby makes the liquid film can form even liquid film in 5 heat exchange tubes. The film distribution is uniform without a dry wall transition area, and the film distribution is better suitable for a heat exchange tube in a falling film evaporator, so that the performance requirement and the use requirement of the falling film evaporator are met.
In an implementation case, the novel pipe orifice film distributor is provided with 4 round holes at the bottom, the diameter of the novel pipe orifice film distributor is 3mm, 4 horizontal round holes are uniformly distributed along the radial direction, and the upper end of the novel pipe orifice film distributor is provided with 2 notches, the width of the novel pipe orifice film distributor is 4mm, and the height of the novel pipe orifice film distributor is 7 mm. The film distributor 2 is connected with the heat exchange tube 5 in an interference fit mode. The distance between the minimum diameter position of the bottom of the film distributor 2 and the inner wall of the heat exchange tube 5 is 0.7 mm.
Through practical inspection, compared with the traditional film distributor, the designed film distributor 2 has the advantages of no blockage, simple structure, no dry wall transition region and uniform film distribution, can better adapt to the heat exchange tube 5 in the falling film evaporator, and meets the performance requirement and the use requirement of the falling film evaporator. The utility model discloses a liquid distribution method has excellent heat transfer efficiency, has wide application prospect.
Claims (7)
1. The utility model provides a porous injection formula liquid distribution device of vertical falling liquid film, includes heat exchange tube and the tube sheet of being connected with the heat exchange tube, the film distributor is installed in the heat exchange tube top, its characterized in that: comprises a liquid distributor (1) with a circular cross section, a film distributor (2) below the liquid distributor (1), and a supporting distance bolt (4) connected between the liquid distributor (1) and a tube plate (3);
the liquid distributor (1) is provided with a plurality of liquid distribution holes; the cross section of the film distributor (2) is circular, the upper end of the film distributor is not provided with an end cover, and the bottom of the film distributor is sealed by the end cover; a plurality of small holes are formed in the same horizontal plane of the pipe wall at the lower end of the film distributor (2); the diameter of the film distributor (2) is gradually reduced in a step shape, and the diameters of the upper section, the middle section and the lower section are sequentially reduced; the maximum diameter of the upper end is larger than the inner diameter of the heat exchange tube (5), and a gap is reserved between the minimum diameter of the bottom and the inner wall of the heat exchange tube; the position with the largest diameter is positioned outside the heat exchange pipe.
2. The vertical falling film multi-hole spray type liquid distribution device according to claim 1, wherein the film distributor (2) is installed on the heat exchange tube (5) by interference fit.
3. The vertical falling film multi-orifice spray type liquid distribution device according to claim 1 or 2, characterized in that: the small holes are uniformly distributed on the same radial plane.
4. The vertical falling film multi-orifice jet type liquid distribution device according to claim 1, characterized in that: the distance between the minimum diameter position of the bottom of the film distributor (2) and the inner wall of the heat exchange tube (5) is 0.6-1.8 mm.
5. The vertical falling film multi-orifice jet type liquid distribution device according to claim 4, characterized in that: the distance between the minimum diameter position of the bottom of the film distributor (2) and the inner wall of the heat exchange tube (5) is 0.8-1.2 mm.
6. The vertical falling film multi-orifice jet type liquid distribution device according to claim 1, characterized in that: the wall thickness of the tube of the film distributor is 1-3 mm.
7. The vertical falling film multi-orifice jet type liquid distribution device according to claim 1, characterized in that: a notch is formed on the pipe wall port at the upper end of the film distributor (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920420183.0U CN209865334U (en) | 2019-03-29 | 2019-03-29 | Vertical falling film porous injection type liquid distribution device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920420183.0U CN209865334U (en) | 2019-03-29 | 2019-03-29 | Vertical falling film porous injection type liquid distribution device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209865334U true CN209865334U (en) | 2019-12-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920420183.0U Active CN209865334U (en) | 2019-03-29 | 2019-03-29 | Vertical falling film porous injection type liquid distribution device |
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| Country | Link |
|---|---|
| CN (1) | CN209865334U (en) |
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2019
- 2019-03-29 CN CN201920420183.0U patent/CN209865334U/en active Active
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