Falling film evaporator for producing textile polyester finishing agent
By designing an integrated film-forming split heat exchange tube, and utilizing solution surface tension and guiding spiral ribs, the problem of uneven liquid distribution was solved, achieving complete film formation and uniform film thickness in the production process of textile polyester finishing agents, thus improving heat transfer efficiency.
Patent Information
- Application Number
- CN202422327343.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-23
- Publication Date
- 2025-12-12
- Estimated Expiration
- 2034-09-23
AI Technical Summary
Existing falling film evaporators have problems in the production of polyester finishing agents for textiles, such as uneven distribution of liquid, which leads to localized drying and scaling, affecting heat transfer efficiency.
An integrated film-forming split heat exchanger tube was designed. Utilizing the surface tension principle of the solution, it ensures uniform solution distribution through expanded film-forming tension holes and guiding spiral ribs. Furthermore, the split flow is assisted by flow guide caps and flow guide rods to improve film uniformity.
This improved the complete film formation rate of the solution, enhanced the uniformity of film thickness, avoided localized drying and scaling, and improved heat transfer efficiency.
Smart Images
Figure CN223654453U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to falling film evaporator technical field especially a kind of falling film evaporator for textile polyester finishing agent production. BACKGROUND
[0002] Falling film evaporation is that liquid is added from upper tube box of heating chamber of falling film evaporator, evenly distributed to each heat exchange tube through liquid distribution and film forming device, under the action of gravity and vacuum induction and airflow, flows from top to bottom in uniform film shape. In the process of flowing, it is heated and vaporized by shell side heating medium, and the generated steam and liquid phase enter the separation chamber of evaporator, and the steam and liquid are fully separated, the steam is condensed in condenser (single effect operation) or enters the next effect evaporator as heating medium, so that multi-effect operation is realized, and the liquid phase is discharged from the separation chamber.
[0003] Liquid distributor is the key component of falling film evaporator, and the heat exchange strength and production capacity of falling film evaporator essentially depend on the uniformity of liquid distribution along the heat exchange tube. The so-called uniform distribution not only means that liquid is evenly distributed to each tube, but also means that liquid is evenly distributed along the entire periphery of each tube, and the uniformity is maintained along the length of the tube. When liquid cannot evenly wet the inner surface of all heating tubes, liquid-deficient or liquid-poor surface may be scaled due to evaporation, and the scaled surface in turn blocks the flow of liquid film, so that the heat transfer condition of the adjacent area is further deteriorated. SUMMARY
[0004] The utility model solves the technical problems that: in order to overcome the problems in the above, provide a kind of falling film evaporator for textile polyester finishing agent production, it solves the above problems.
[0005] The utility model solves the technical problems by adopting the following technical solutions:
[0006] A kind of falling film evaporator for textile polyester finishing agent production, including evaporator shell and the top cover of the fixed upper end of the evaporator shell, the top of the top cover is equipped with a passageway for accessing solution, and fixedly arranged in the evaporator shell is fixed frame, the fixed frame is used to interval fixed integrated film forming shunt heat exchange tube, the lower end of the evaporator shell is equipped with the liquid discharge pipe for discharging waste liquid, the side of the evaporator shell is also equipped with hot gas pipe joint, wherein the integrated film forming shunt heat exchange tube is equipped with a pipe-shaped clamping cavity for assisting solution film forming during downflow.
[0007] Preferably, the integrated film forming shunt heat exchange tube includes film forming outer tube and film forming inner tube inserted in the film forming outer tube, and the film forming inner tube and the film forming outer tube are provided with a gap for solution filling and film forming.
[0008] Preferably, the surface of the film-forming inner tube is provided with penetrating film-forming tension holes, which are filled by the solution under the action of surface tension when the solution flows into the gap between the film-forming outer tube and the film-forming inner tube, and the surface tension effect of the film-forming tension holes on the solution effectively reduces the spreading speed of the solution just after flowing down, thereby avoiding the phenomenon that some parts are not covered by the solution.
[0009] Preferably, the film-forming tension hole has an outwardly flared shape, and the inner side wall diameter of the film-forming tension hole is smaller than the outer side wall diameter, so that the solution flows along the outer side wall of the film-forming inner tube under the action of surface tension, thereby reducing the probability of the solution flowing through the film-forming tension hole to the inner side wall of the film-forming inner tube.
[0010] Preferably, the outer side wall of the film-forming inner tube is further provided with a guide spiral rib, which is used to relatively fix the film-forming outer tube and the film-forming inner tube, and has a spiral guiding and decelerating effect on the flowing solution, thereby improving the coverage rate of the solution to the inner wall of the film-forming outer tube during the flowing process.
[0011] Preferably, the upper end of the integrated film-forming and shunt heat exchange pipe is further provided with a flow guide end cover, the inner diameter of the flow guide end cover is consistent with the outer diameter of the film-forming outer tube, an annular gap is provided in the flow guide end cover, a flow guide rod with a diameter smaller than the inner diameter of the liquid supply hole is fixed in the flow guide end cover, and the lower end of the flow guide rod extends into the gap between the film-forming outer tube and the film-forming inner tube to drip the solution, which has a simple structure but good shunt effect.
[0012] The advantages and positive effects of the utility model are as follows: by utilizing the surface tension principle of the solution, the film-forming tension hole with an expanded hole shape is designed to make the solution gradually expand and move during the flowing process, thereby avoiding the phenomenon that some parts of the film-forming outer tube are not flowed through by the solution due to the rapid dripping phenomenon, and the guide spiral rib is further added to spiral directionally decelerate and guide the solution, thereby further reducing the phenomenon of uneven film-forming caused by the rapid dripping of the solution, and in addition, the gap between the inner wall of the film-forming inner tube and the film-forming outer tube can be controlled to change the film-forming thickness of the solution, which cannot be achieved by the prior art, and compared with the prior art, the complete film-forming rate of the device is better, and the film thickness is uniform and reliable. BRIEF DESCRIPTION OF DRAWINGS
[0013] The utility model will be further described below in combination with the drawings and examples.
[0014] Figure 1 is a sectional view structure schematic diagram of the utility model;
[0015] Figure 2 is Figure 1 is an explosion structure schematic diagram of 15;
[0016] Figure 3 yes Figure 1 A schematic diagram of the explosive structure of the 15th ion. Detailed Implementation
[0017] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention. The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings:
[0018] like Figures 1-3 As shown, the present invention discloses a falling film evaporator for producing polyester finishing agents, comprising an evaporator shell 11 and a top cover 10 fixed to the upper end of the evaporator shell 11. The top of the top cover 10 is provided with a channel for inlet of solution, and a fixing frame 12 is fixedly provided inside the evaporator shell 11. The fixing frame 12 is used to fix integrated film-forming diversion heat exchange tubes 15 at intervals. A drain pipe 14 for discharging waste liquid is provided at the lower end of the evaporator shell 11. A heating gas pipe joint 13 is also provided on the side of the evaporator shell 11. The integrated film-forming diversion heat exchange tube 15 is provided with a pipe-shaped cavity to assist in film formation during the downward flow of solution.
[0019] Preferably, the integrated film-forming split heat exchange tube 15 includes an outer film-forming tube 21 and an inner film-forming tube 18 inserted in the outer film-forming tube 21. A gap is provided between the inner film-forming tube 18 and the outer film-forming tube 21 for film formation after solution filling.
[0020] Preferably, the inner film-forming tube 18 is provided with through-holes 19 at intervals. When the solution flows into the gap between the outer film-forming tube 21 and the inner film-forming tube 18, it will fill the film-forming tension holes 19 one by one from top to bottom under the action of tension. The film-forming tension holes 19 effectively reduce the spreading speed of the solution when it first flows down due to the surface tension of the solution, thus avoiding the phenomenon that some areas are not covered by the solution.
[0021] Preferably, the film-forming tension hole 19 has an outwardly flared shape, and the inner wall diameter of the film-forming tension hole 19 is smaller than the outer wall diameter. This design allows the solution to flow on the outer wall of the film-forming inner tube 18 through the surface tension of the solution, reducing the probability that the solution will flow through the film-forming tension hole 19 to the inner wall of the film-forming inner tube 18.
[0022] Preferably, a guide spiral rib 20 is fixed outside the film-forming inner tube 18, which is used to fix the film-forming outer tube 21 and the film-forming inner tube 18 relative to each other, and has a spiral guide and speed reduction effect on the flowing solution, so as to improve the coverage of the inner wall of the film-forming outer tube 21 during the flowing process of the solution.
[0023] Preferably, a guide end cover 16 is sleeved at the upper end of the integrated film-forming shunt heat exchange pipe 15, the inner diameter of the guide end cover 16 is consistent with the outer diameter of the film-forming outer tube 21, liquid supply holes 17 are arranged in the annular space of the guide end cover 16, and a guide rod 22 with a smaller diameter than the inner diameter of the liquid supply holes 17 is fixed in the guide end cover 16, the lower end of the guide rod 22 extends into the gap between the film-forming outer tube 21 and the film-forming inner tube 18 to drip the solution, and the structure is simple but has a good shunt effect.
[0024] It should be emphasized that the embodiments of the utility model are illustrative rather than restrictive, and thus the utility model is not limited to the embodiments described in the specific embodiments, and any other embodiments derived by those skilled in the art according to the technical scheme of the utility model also belong to the protection scope of the utility model.
Claims
1. A falling film evaporator for the production of textile polyester finishing agents, characterized in that: The application relates to a heat exchanger, which comprises an evaporator shell (11) and a top cover (10) fixed on the upper end of the evaporator shell (11), the top of the top cover (10) is provided with a channel for accessing solution, a fixing frame (12) is fixedly arranged in the evaporator shell (11) and used for spacing and fixing integrated film-forming and shunt heat exchange pipes (15), a liquid discharge pipe (14) for discharging waste liquid is arranged at the lower end of the evaporator shell (11), and a hot gas pipe joint (13) is further arranged at the side of the evaporator shell (11), wherein a pipe-shaped clamping cavity is arranged in the integrated film-forming and shunt heat exchange pipe (15) and used for assisting film formation during solution downward flow.
2. The falling film evaporator for textile polyester finishing agent production according to claim 1, characterized in that: The integrated film-forming and shunt heat exchange pipe (15) comprises a film-forming outer pipe (21) and a film-forming inner pipe (18) inserted into the film-forming outer pipe (21), and a gap is arranged between the film-forming inner pipe (18) and the film-forming outer pipe (21) for film formation after solution filling.
3. The falling film evaporator for textile polyester finishing agent production according to claim 2, characterized in that: Film-forming tension holes (19) are arranged at the surface of the film-forming inner pipe (18) in a spaced manner, the film-forming tension holes (19) are filled one by one from top to bottom under the action of tension after solution flows into the gap between the film-forming outer pipe (21) and the film-forming inner pipe (18), and the surface tension effect of the film-forming tension holes (19) on solution effectively reduces the spreading speed of the solution just after flowing down, so that the phenomenon that a part is not covered by the solution is avoided.
4. The falling film evaporator for textile polyester finishing agent production according to claim 3, characterized in that: The film-forming tension hole (19) is in the shape of an outward flared shape, the inner side wall hole diameter of the film-forming tension hole (19) is smaller than the outer side wall hole diameter, and the design can make the solution flow on the outer side wall of the film-forming inner pipe (18) through the surface tension effect of the solution, and reduce the probability of the solution flowing through the film-forming tension hole (19) to the inner side wall of the film-forming inner pipe (18).
5. The falling film evaporator for textile polyester finishing agent production according to claim 4, characterized in that: A guide spiral rib (20) is further fixedly arranged on the outer side wall of the film-forming inner pipe (18), the guide spiral rib (20) is used for relatively fixing the film-forming outer pipe (21) and the film-forming inner pipe (18), and has spiral guiding and speed reducing effects on the flowing solution, so that the coverage rate of the solution on the inner wall of the film-forming outer pipe (21) during the solution downward flow process is improved.
6. The falling film evaporator for textile polyester finishing agent production according to claim 5, characterized in that: A flow guide end cover (16) is further sleeved at the upper end of the integrated film-forming and shunt heat exchange pipe (15), the inner diameter of the flow guide end cover (16) is consistent with the outer diameter of the film-forming outer pipe (21), liquid supply holes (17) are arranged in the annular space of the flow guide end cover (16), a flow guide rod (22) with a diameter smaller than the inner diameter of the liquid supply hole (17) is fixedly arranged in the flow guide end cover (16), and the lower end of the flow guide rod (22) extends into the gap between the film-forming outer pipe (21) and the film-forming inner pipe (18) to drip the solution.