CN111991823B - Fluid distribution plate for falling film evaporator - Google Patents
Fluid distribution plate for falling film evaporator Download PDFInfo
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- CN111991823B CN111991823B CN202010852135.6A CN202010852135A CN111991823B CN 111991823 B CN111991823 B CN 111991823B CN 202010852135 A CN202010852135 A CN 202010852135A CN 111991823 B CN111991823 B CN 111991823B
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- plate body
- fluid
- distribution plate
- fluid distribution
- film evaporator
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/22—Evaporating by bringing a thin layer of the liquid into contact with a heated surface
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/30—Accessories for evaporators ; Constructional details thereof
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- Chemical Kinetics & Catalysis (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The invention discloses a fluid distribution plate for a falling film evaporator, which comprises: the plate body is uniformly provided with sieve pores and through holes; the guide rings are arranged on the plate body and are concentric elliptical rings; when the fluid distribution plate is used, liquid flows from the upper part of the plate body and flows into the concentric guide rings, so that the liquid is stably concentrated in the guide rings, and backflow vortexes generated when the fluid flows from the center to the two ends of the fluid distribution plate due to pressure drop when the speed of the liquid flowing from the upper part of the plate body is high are reduced. When the central guide ring current is full, the fluid can flow downwards along the height to the surrounding guide rings, so that the fluid can stably and uniformly spread to the two ends of the plate body, and the sieve holes with larger pore diameters can play a role in stabilizing return vortex, thereby ensuring that the fluid is uniformly distributed on the plate body, and solving the technical problem that the return vortex generated when the fluid flows along the distribution plate in the prior art is more. The through holes are fully utilized, and the evaporation efficiency and the concentration efficiency are improved.
Description
Technical Field
The invention relates to the technical field of evaporator accessories, in particular to a fluid distribution plate for a falling film evaporator.
Background
Evaporators are widely used in chemical industry, food industry, pharmaceutical industry and the like, and in order to ensure that the amount of liquid flowing into each heating pipe is uniform, a constant liquid level is required to be ensured on a fluid distribution plate above the falling film evaporator. When the traditional fluid distribution plate is used, when the fluid flowing from the upper part is high in speed, the pressure drop enables the fluid to flow from the center to the two ends of the fluid distribution plate, backflow vortexes can occur, the liquid level on the fluid distribution plate is unstable, the uniformity of the liquid level of the liquid material is not facilitated, and the evaporation and concentration efficiency is influenced. In order to improve the liquid level distribution of the traditional fluid distribution plate, the invention considers that the guide ring is adopted to reduce the occurrence of backflow vortex and stabilize the liquid level of the fluid distribution plate.
Disclosure of Invention
The invention aims to provide a fluid distribution plate for a falling film evaporator, which solves the technical problem that more backflow vortexes are generated when fluid flows along the distribution plate in the prior art.
The embodiment of the application discloses a fluid distribution plate for falling film evaporator, includes:
the plate body is uniformly provided with sieve pores and through holes;
the guide rings are arranged on the plate body and are concentric elliptical rings.
The embodiment of the application discloses a fluid distribution plate, through using concentric water conservancy diversion ring, under the effect of upper arc water conservancy diversion structure, reduce the appearance of backward flow swirl on the fluid distribution plate for flow evenly distributed is at plate body both ends, reinforcing falling film evaporator heat and mass transfer characteristic.
On the basis of the technical scheme, the embodiment of the application can be further improved as follows:
furthermore, the diameter of the through hole is 1-3mm, the diameter of the sieve pore is 2-6mm, and the step has the advantage that the sieve pore with the larger diameter plays a role in stabilizing the position of the backflow vortex.
Further, the ratio of the length of the plate body to the width of the plate body is 5: 1.
Further, the height of the guide rings is gradually reduced from the center from inside to outside, the number of the guide rings is n, and the ratio of the height of the guide rings from inside to outside is n: n-1: … …:1, n is not less than 3, and the beneficial effect of the step is that the effect of stably and uniformly spreading the fluid among different guide rings is optimal until the two ends of the plate body.
Furthermore, the upper side of the guide ring is arc-shaped, the included angle between the arc angle at the two ends of the guide ring and the horizontal direction is 120 degrees, and the beneficial effects of the step are that the fluid flows along the long axis of the guide ring, the fluid is prevented from separating from the fluid distribution plate in the short axis direction of the guide ring, and the heat and mass transfer characteristics of the falling film evaporator are enhanced.
Furthermore, the long axis of the guide ring positioned in the middle of the plate body is 40-42mm, the short axis is 5-7mm, the difference value of the long axis of any adjacent guide ring is 100mm, and the difference value of the short axis is 10 mm.
Further, the thickness of the plate body is h, the height of the flow guide ring located in the center of the plate body is not less than 2.5h, and the specific height is determined by the incoming flow speed of liquid.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
1. the concentric flow guide rings are arranged on the plate body, so that the occurrence of backflow vortexes on the flow distribution plate is reduced, the flow is uniformly distributed at the two ends of the plate body, and the heat and mass transfer characteristics of the falling film evaporator are enhanced.
2. The embodiment of the application utilizes the great sieve mesh in aperture can play the effect of the position of stable backward flow swirl.
3. The embodiment of the application utilizes the through hole with smaller aperture, and can improve the evaporation and concentration efficiency.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a front view of a fluid distribution plate for a falling film evaporator according to an embodiment of the present invention;
FIG. 2 is a top view of a fluid distribution plate for a falling film evaporator according to an embodiment of the present invention;
FIG. 3 is a flow diagram of a prior art liquid distribution plate;
FIG. 4 is a flow diagram of a liquid distribution plate according to an embodiment of the present application;
reference numerals:
1-a plate body; 2-a flow guide ring;
101-mesh; 102-through holes.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the invention pertains.
In the description of the present application, it is to be understood that the terms "upper", "lower", "inner", "outer", "top", "bottom", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The fluid distribution plate for the falling film evaporator, provided by the embodiment of the application, solves the technical problem that in the prior art, backflow vortexes generated when fluid flows along the distribution plate are more.
The general idea of the embodiment of the application is as follows: the plate body is provided with a plurality of concentric elliptical rings, firstly, fluid flows into the concentric flow guide rings to enable the liquid to be more stably concentrated in the circular rings, so that the fluid speed is reduced, and after the central flow guide ring is full of flow, the fluid can flow downwards along the height to the surrounding flow guide rings, so that the fluid can stably and uniformly spread to the two ends of the plate body, and backflow vortexes are reduced.
In order to better understand the technical solutions, the technical solutions will be described in detail below with reference to the drawings and the detailed description.
Example 1
As shown in fig. 1-2, the present embodiment provides a fluid distribution plate for a falling film evaporator, comprising:
the plate comprises a plate body 1, wherein sieve holes 101 and through holes 102 are uniformly formed in the plate body 1;
the guide rings 2 are arranged on the plate body 1, and the guide rings 2 are concentric elliptical rings; the water conservancy diversion ring in this application embodiment can reduce the figure of backward flow swirl, and when plate body top incoming flow liquid, the fluid stream advances the water conservancy diversion ring, and liquid can be more stable concentrate in the ring, has reduced like this when incoming flow liquid speed is very fast, because the pressure drop makes the fluid by the center to the backward flow swirl that appears when fluid distribution plate both ends flow.
Specifically, the diameter of the through holes 102 is 1-3mm, and the diameter of the screen holes 101 is 2-6mm, wherein the hole diameter of the through holes 102 is small, the purpose of the through holes is to improve the evaporation and concentration efficiency, and the hole diameter of the screen holes 101 is large, and the purpose of the screen holes is to stabilize the position of the backflow vortex.
Specifically, the ratio of the length of the plate body 1 to the width of the plate body 1 is 5: 1.
Specifically, the height of the guide rings 2 is gradually reduced from the center from inside to outside, the number of the guide rings 2 is n, and the ratio of the height of the guide rings 2 from inside to outside is n: n-1: … …:1, n is not less than 3, can make the fluid steadily evenly spread to the plate body both ends through the water conservancy diversion ring.
Specifically, the upper side of the deflector ring 2 is arc-shaped, and the arc angles at the two ends of the deflector ring are 120 °.
Specifically, the long axis of the guide ring 2 located in the middle of the plate body 1 is 40-42mm, the short axis is 5-7mm, the difference between the long axes of any adjacent guide rings is 100mm, and the difference between the short axes is 10 mm.
Specifically, the thickness of the plate body 1 is h, and the height of the flow guide ring 2 located at the center of the plate body 1 is not less than 2.5 h.
When the liquid distributor is used, incoming liquid flows into the concentric guide ring 2 above the plate body, so that the liquid is stably concentrated in the guide ring 2, and backflow vortexes which appear when the incoming liquid flows from the center to the two ends of the fluid distribution plate due to pressure drop are reduced when the incoming liquid is high in speed. After the diversion ring 2 at the center is full, the fluid can flow to the diversion ring 2 around along the height downward direction, so that the fluid stably and uniformly stretches to the two ends of the plate body, the sieve holes with larger apertures can play the role of stabilizing the backflow vortex, the fluid is uniformly distributed on the plate body, the through holes are fully utilized, and the evaporation efficiency and the concentration efficiency are improved.
With respect to the description of fig. 3 and 4, fig. 3 and 4 are both verified by computer simulation experiments;
the numerical simulation can be used for carrying out simulation calculation on the complex flow problem of the flow distribution plate by utilizing computational fluid mechanics, and the flow mechanism and the flow rule of the flow distribution plate in the falling film evaporator are revealed by solving a fluid motion equation through numerical dispersion.
Setting boundary conditions in fluent: the fluid is liquid water under normal temperature and normal pressure, the section of the liquid inlet adopts a speed inlet, and the inlet flow speed is 6 m/s; carrying out numerical simulation on fluid flow in the 1/4 flow distribution plate and the upper space thereof, wherein the reference pressure is 1 atm; the wall surface of the distribution plate is set to be a smooth non-slip wall surface.
The following results are obtained through verification of a numerical simulation experiment method: as can be seen from the velocity field flow diagrams shown in fig. 3 (prior art liquid distribution plate flow diagram) and fig. 4 (liquid distribution plate flow diagram of the embodiments of the present application), the present invention contemplates a fluid distribution plate having a more uniform flow regime than conventional fluid distribution plates. Therefore, the designed fluid distribution plate has obvious flow improvement effect.
In the description of the present invention, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.
Claims (7)
1. A fluid distribution plate for a falling film evaporator comprising:
the plate body (1) is uniformly provided with sieve holes (101) and through holes (102);
the guide plate comprises a plurality of guide rings (2), wherein the guide rings (2) are arranged on the plate body (1), and the guide rings (2) are concentric elliptical rings.
2. A fluid distribution plate for a falling film evaporator according to claim 1 wherein the through holes (102) have a diameter of 1-3mm and the screen holes (101) have a diameter of 2-6 mm.
3. A fluid distribution plate for a falling film evaporator according to claim 1 wherein the ratio of the length of the plate body (1) to the width of the plate body (1) is 5: 1.
4. A fluid distribution plate for a falling film evaporator according to claim 1, characterized in that the height of the deflector rings (2) decreases gradually from the center from the inside to the outside, the number of deflector rings (2) is n, the ratio of the height of the deflector rings (2) from the inside to the outside is n: n-1: … …:1, n is not less than 3.
5. A fluid distribution plate for a falling film evaporator according to claim 1, characterized in that the upper side of the deflector ring (2) is arc-shaped and the arc angle of both ends of the deflector ring (2) is 120 ° from the horizontal.
6. A fluid distribution plate for a falling film evaporator according to claim 1, characterized in that the guide rings (2) located in the middle of the plate body (1) have a major axis of 40-42mm and a minor axis of 5-7mm, and any adjacent guide rings (2) have a major axis difference of 100mm and a minor axis difference of 10 mm.
7. A fluid distribution plate for a falling film evaporator according to claim 1, characterized in that the plate body (1) has a thickness h and the height of the deflector ring (2) in the center of the plate body (1) is not less than 2.5 h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010852135.6A CN111991823B (en) | 2020-08-21 | 2020-08-21 | Fluid distribution plate for falling film evaporator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010852135.6A CN111991823B (en) | 2020-08-21 | 2020-08-21 | Fluid distribution plate for falling film evaporator |
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| Publication Number | Publication Date |
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| CN111991823A CN111991823A (en) | 2020-11-27 |
| CN111991823B true CN111991823B (en) | 2022-04-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010852135.6A Active CN111991823B (en) | 2020-08-21 | 2020-08-21 | Fluid distribution plate for falling film evaporator |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109140835A (en) * | 2018-08-07 | 2019-01-04 | 南京恒标斯瑞冷冻机械制造有限公司 | A kind of downward film evaporator |
| CN209098539U (en) * | 2018-10-25 | 2019-07-12 | 四川中蓝国塑新材料科技有限公司 | A kind of diphenyl carbonate reclaimer |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2695573B1 (en) * | 1992-09-15 | 1994-10-21 | Pechiney Recherche | Gas-liquid dripping film contactor. |
| CN201257310Y (en) * | 2008-07-14 | 2009-06-17 | 张家港市化工机械有限公司 | Film coating device in tubular type falling-film evaporator |
| KR102204612B1 (en) * | 2013-12-17 | 2021-01-19 | 엘지전자 주식회사 | Distributor unit and evaporator comprising the same |
| CN104826351B (en) * | 2015-05-11 | 2016-07-06 | 珠海格力电器股份有限公司 | Falling film evaporator, liquid distributor and liquid equalizing plate thereof |
| CN205182217U (en) * | 2015-12-07 | 2016-04-27 | 郑秀泽 | High -efficient cloth membrane device of tubular falling film evaporation ware |
| CN109059603A (en) * | 2018-09-14 | 2018-12-21 | 西安热工研究院有限公司 | Guiding device and method in a kind of printed circuit board exchanger head |
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2020
- 2020-08-21 CN CN202010852135.6A patent/CN111991823B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109140835A (en) * | 2018-08-07 | 2019-01-04 | 南京恒标斯瑞冷冻机械制造有限公司 | A kind of downward film evaporator |
| CN209098539U (en) * | 2018-10-25 | 2019-07-12 | 四川中蓝国塑新材料科技有限公司 | A kind of diphenyl carbonate reclaimer |
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| CN111991823A (en) | 2020-11-27 |
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