Falling film high efficiency evaporator

Abstract

This utility model discloses a falling film high-efficiency evaporator, including a tank and a steam inlet pipe, a steam outlet pipe, a feed pipe, a discharge pipe, and a condensate outlet pipe disposed on the tank. The steam inlet pipe is located on one side of the lower part of the tank, the steam outlet pipe and the condensate outlet pipe are located on one side of the upper part of the tank, the feed pipe is located at the top of the tank, and the discharge pipe is located at the bottom of the tank. The key feature is that a falling film device is provided inside the tank, comprising multiple hollow film structures arranged sequentially from top to bottom. Adjacent hollow film structures are staggered left and right and inclined downwards. The uppermost hollow film structure has a liquid inlet pipe aligned with the lower end of the feed pipe, and the lowermost hollow film structure has a liquid outlet pipe. The outer ring of the hollow film structure is fixed to the inner wall of the tank by a connecting plate. The connecting plate is inclined with the hollow film structure and has an opening on the lower side. This falling film high-efficiency evaporator increases the contact area and contact time between the liquid and steam, resulting in faster evaporation of the liquid and significantly improving the working efficiency of the evaporator.

Description

Technical Field

[0001] This utility model relates to the field of evaporation equipment technology, specifically to a falling film type high-efficiency evaporator. Background Technology

[0002] A falling film evaporator is a highly efficient thin-film evaporation device, mainly used for the concentration, separation, or recovery of liquid materials. Its core feature is that gravity causes the liquid to form a thin film flowing on a heated surface, thus achieving rapid evaporation. For example, Chinese utility model patent application number CN202420710723.X discloses a falling film evaporator, including a support leg, one end of which is connected to a reaction vessel. A feed pipe is located at the top center of the reaction vessel. An air inlet pipe is located on the upper side of the support leg, and an air outlet pipe is located on the upper side of the support leg, away from the air inlet pipe. A condensate pipe is located on the lower side of the support leg, away from the condensate pipe. A discharge pipe is located at the bottom center of the reaction vessel. A first filter plate is welded to the upper interior of the reaction vessel, and a second filter plate is welded to the upper interior of the reaction vessel, above the first filter plate. A cone is connected to the top center of the second filter plate. In this type of falling film evaporator, the contact time between the liquid and steam is short, the contact area is small, the steam utilization rate is low, and the evaporation efficiency is poor. Utility Model Content

[0003] In view of the shortcomings of the prior art, the technical problem to be solved by this utility model is to provide a falling film high-efficiency evaporator that can increase the contact area and contact time between the liquid and the steam and has higher working efficiency.

[0004] Therefore, this utility model is implemented using the following technical solution:

[0005] A falling film high-efficiency evaporator includes a tank and a steam inlet pipe, a steam outlet pipe, a feed pipe, a discharge pipe, and a condensate outlet pipe disposed on the tank. The steam inlet pipe is located on the lower side of the tank, the steam outlet pipe and the condensate outlet pipe are located on the upper side of the tank, the feed pipe is located at the top of the tank, and the discharge pipe is located at the bottom of the tank. The tank is characterized by a falling film device comprising multiple hollow film structures arranged sequentially from top to bottom. Adjacent hollow film structures are staggered left and right and inclined downwards. The uppermost hollow film structure has a liquid inlet pipe aligned with the lower end of the feed pipe, and the lowermost hollow film structure has a liquid outlet pipe. The outer ring of the hollow film structure is fixed to the inner wall of the tank via a connecting plate. The connecting plate is inclined with the hollow film device, and the connecting plate has an opening on its lower side.

[0006] Furthermore, the hollow fabric membrane structure includes an upper cover and a lower cover. The top of the upper cover and the bottom of the lower cover are both provided with through holes. The through hole of the uppermost upper cover is connected to the liquid inlet pipe, and the through hole of the lowermost lower cover is connected to the liquid outlet pipe. The through holes of the adjacent lower cover and upper cover are connected by connecting pipes.

[0007] Furthermore, the upper and lower covers are arranged symmetrically both vertically and horizontally, and both the upper and lower covers are eccentrically conical.

[0008] Furthermore, the inner walls of both the upper and lower covers are provided with several arc-shaped fabric grooves. The arc-shaped fabric grooves extend from the through hole of the eccentric cone to the large opening of the eccentric cone, and the width of the arc-shaped fabric grooves gradually increases from the through hole of the eccentric cone to the large opening of the eccentric cone.

[0009] Furthermore, the inlet pipe is provided with a membrane applicator that extends out of the inlet pipe. The membrane applicator is conical in shape, and there is a gap between the lower outer edge of the membrane applicator and the inner wall of the inlet pipe. The lower outer edge of the membrane applicator is welded to the inner wall of the inlet pipe by multiple connecting rods.

[0010] Furthermore, a circulation pipe is provided between the bottom of the tank and the feed pipe, and a circulation pump is provided on the circulation pipe.

[0011] Furthermore, the connecting plate is welded and fixed to the inner wall of the tank.

[0012] With the above technical solution, during operation, steam is introduced into the tank through the steam inlet pipe for preheating, and the liquid material enters the tank through the feed pipe. A portion of the liquid material enters the hollow membrane structure through the liquid inlet pipe and undergoes membrane evaporation through the hollow structure. The hollow structure increases the contact area and contact time between the liquid material and steam. Due to the staggered left-right orientation and downward tilt of the hollow membrane structure, the liquid material within the hollow membrane structure flows from high to low and enters the next layer of hollow membrane structure. The liquid material flows in opposite directions within adjacent layers of hollow membrane structures, further increasing the contact area and contact time between the liquid material and steam. Simultaneously, another portion of the liquid material flows towards the upper surface of the hollow membrane structure and the connecting plate, and through the opening on the lower side of the connecting plate, flows to the lower surface of the hollow membrane structure and the next layer of hollow membrane structure. The hollow membrane structure and the upper surface of the connecting plate are also staggered left and right and tilted downwards. The connecting plate is tilted with the hollow membrane device, and the opening is located on the lower side of the connecting plate. The liquid flows from high to low. The liquid flow direction of the adjacent hollow membrane structure and the upper surface of the connecting plate is opposite to increase the contact area and contact time between the liquid and the steam. The liquid evaporates on both the inner and outer surfaces of the hollow membrane structure. Combined with the connecting plate and the opening, the liquid evaporates faster, and the working efficiency of the evaporator is greatly improved. In addition, the steam enters the bottom of the tank through the steam inlet pipe, and then gradually enters the upper hollow membrane structure and the space between the two hollow membrane structures through the opening and the liquid outlet pipe. The above structure makes the steam stay in the tank for a longer time and the steam utilization rate is higher. Attached Figure Description

[0013] The present invention includes the following figures:

[0014] Figure 1 This is a schematic diagram of the internal structure of the present invention;

[0015] Figure 2 This is a top view of the uppermost hollow fabric membrane structure of this utility model;

[0016] Figure 3 This is a bottom view of the upper cover and connecting plate (connecting plate cut open) in this utility model;

[0017] Figure 4 This is a top view of the lower cover and connecting plate (connecting plate cut open) of this utility model;

[0018] Figure 5 for Figure 1 Enlarged view of point A in the middle;

[0019] Figure 6 This is a top view of the liquid inlet pipe and the film distributor in this utility model.

[0020] Reference numerals: 1. Tank body; 2. Steam inlet pipe; 3. Steam outlet pipe; 4. Feed pipe; 5. Discharge pipe; 6. Condensate outlet pipe; 7. Hollow membrane structure; 8. Liquid inlet pipe; 9. Liquid outlet pipe; 10. Connecting plate; 11. Opening; 12. Upper cover; 13. Lower cover; 14. Through hole; 15. Connecting pipe; 16. Arc-shaped membrane groove; 17. Large opening; 18. Membrane distributor; 19. Gap; 20. Connecting rod; 21. Circulation pipe; 22. Circulation pump. Detailed Implementation

[0021] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0022] Referring to the attached figures, the present invention provides a falling film high-efficiency evaporator comprising a tank 1 and a steam inlet pipe 2, a steam outlet pipe 3, a feed pipe 4, a discharge pipe 5, and a condensate outlet pipe 6 disposed on the tank 1. The steam inlet pipe 2 is located on the lower side of the tank 1, the steam outlet pipe 3 and the condensate outlet pipe 6 are located on the upper side of the tank 1, the feed pipe 4 is located at the top of the tank 1, and the discharge pipe 5 is located at the bottom of the tank 1. The characteristic feature is that a falling film device is provided inside the tank 1, and the falling film device includes multiple hollow film structures 7 arranged sequentially from top to bottom. The hollow fabric membrane structure 7 is offset left and right and tilted downwards. The uppermost hollow fabric membrane structure 7 has a liquid inlet pipe 8 aligned with the lower end of the feed pipe 4 at its upper end, and a liquid outlet pipe 9 at the lower end of the lower hollow fabric membrane structure 7. The outer ring of the hollow fabric membrane structure 7 is fixed to the inner wall of the tank body 1 by a connecting plate 10. The connecting plate 10 tilts with the hollow fabric membrane device 18, and the connecting plate 10 has an opening 11 on the lower side. The hollow fabric membrane structure 7 includes an upper cover 12 and a lower cover 13. Through holes 14 are opened at the top of the upper cover 12 and the bottom of the lower cover 13. The through hole 14 of the upper cover 12 is connected to the liquid inlet pipe 8, and the through hole 14 of the lower cover 13 is connected to the liquid outlet pipe 9. The through holes 14 of the adjacent lower cover 13 and upper cover 12 are connected by a connecting pipe 15. The upper cover 12 and lower cover 13 are arranged symmetrically both vertically and horizontally, and both the upper cover 12 and lower cover 13 are eccentrically conical. The inner walls of the upper cover 12 and lower cover 13 are provided with several arc-shaped film-forming grooves 16, which extend from the through hole 14 of the eccentric cone to the large opening 17 of the eccentric cone. Furthermore, the width of the arc-shaped film-forming groove 16 gradually increases from the eccentric conical through hole 14 to the eccentric conical large opening 17. The inlet pipe 8 is provided with a film-forming device 18 that extends out of the inlet pipe 8. The film-forming device 18 is conical in shape. The lower outer edge of the film-forming device 18 has a gap 19 with the inner wall of the inlet pipe 8. The lower outer edge of the film-forming device 18 is welded to the inner wall of the inlet pipe 8 by multiple connecting rods 20. A circulation pipe 21 is provided between the bottom of the tank body 1 and the feed pipe 4. A circulation pump 22 is provided on the circulation pipe 21. The connecting plate 10 is welded and fixed to the inner wall of the tank body 1.

[0023] In this embodiment, during operation, steam is introduced into the tank 1 through the steam inlet pipe 2 for preheating. The liquid material enters the tank 1 through the feed pipe 4. A portion of the liquid material enters the hollow fabric membrane structure 7 through the liquid inlet pipe 8 and undergoes evaporation through the hollow structure. The hollow structure increases the contact area and contact time between the liquid material and steam. Because the hollow fabric membrane structure 7 is offset left and right and tilted downwards, the liquid material within the hollow fabric membrane structure 7 flows from high to low and enters the next layer of hollow fabric membrane structure 7. The liquid material flows in opposite directions within adjacent layers of hollow fabric membrane structure 7, further increasing the contact area and contact time between the liquid material and steam. Simultaneously, another portion of the liquid material flows towards the upper surface of the hollow fabric membrane structure 7 and the connecting plate 10, and is then... The liquid flows from the opening 11 on the lower side of the connecting plate 10 to the lower surface of the hollow membrane structure 7, the next layer of hollow membrane structure 7, and the upper surface of the connecting plate 10. Similarly, because the hollow membrane structure 7 is offset left and right and tilted downwards, and the connecting plate 10 is tilted with the hollow membrane distributor 18, the opening 11 is located on the lower side of the connecting plate 10. The liquid flows from high to low. The liquid flow direction of the adjacent hollow membrane structure 7 and the upper surface of the connecting plate 10 is opposite to increase the contact area and contact time between the liquid and steam. Liquid evaporates on both the inner and outer surfaces of the hollow membrane structure 7. Combined with the connecting plate 10 and the opening 11, this makes the liquid evaporate faster, greatly improving the working efficiency of the evaporator. In addition, steam enters through the steam inlet pipe. 2. The steam enters the bottom of tank 1, and then gradually enters the upper hollow membrane structure 7 and the space between the two hollow membrane structures 7 through opening 11 and outlet pipe 9. This structure allows the steam to stay in tank 1 for a longer time and has a higher steam utilization rate. Since the hollow membrane structure 7 includes an upper cover 12 and a lower cover 13, the liquid enters through the through hole 14 of the upper cover 12 and first flows to the inner wall of the upper cover 12, then to the inner wall of the lower cover 13, and finally flows to the lower hollow membrane structure 7 through the through hole 14 and connecting pipe 15 of the lower cover 13, increasing the contact area and contact time between the liquid and the steam. Since the upper cover 12 and the lower cover 13 are symmetrically arranged vertically and horizontally, and the upper cover 12 and the lower cover 13 are symmetrically arranged vertically and horizontally, the liquid enters through the through hole 14 of the lower cover 13 and outlet pipe 9. All 13 are eccentrically conical, allowing the liquid to flow to more of the inner walls of the upper and lower covers 12 and 13, resulting in a larger film-forming area. The arc-shaped film-forming groove 16 guides and disperses the liquid, improving the film-forming effect. The film-forming device 18 allows the liquid to flow from the gap 19 to the inlet pipe 8 and the inner wall of the upper cover 12, improving the film-forming effect and preventing most of the liquid from directly flowing into the lower cover 13. The conical film-forming device 18 makes the liquid more evenly distributed when it falls, which is beneficial for film formation. The circulation pipe 21 and circulation pump 22 can send the liquid at the bottom of the tank 1 to the inlet pipe 4 and then into the upper part of the tank 1 for circulation, film formation, and evaporation until a liquid meeting the standard concentration is obtained.

Claims

1. A falling film high-efficiency evaporator, comprising a tank body and a steam inlet pipe, a steam outlet pipe, a feed pipe, a discharge pipe, and a condensate outlet pipe disposed on the tank body, wherein the steam inlet pipe is located on one side of the lower part of the tank body, the steam outlet pipe and the condensate outlet pipe are located on one side of the upper part of the tank body, the feed pipe is located at the top of the tank body, and the discharge pipe is located at the bottom of the tank body, characterized in that: The tank is equipped with a falling film device, which includes multiple hollow cloth film structures connected sequentially from top to bottom. Adjacent hollow cloth film structures are staggered left and right and tilted downwards. The uppermost hollow cloth film structure has a liquid inlet pipe aligned with the lower end of the feed pipe, and the lowermost hollow cloth film structure has a liquid outlet pipe. The outer ring of the hollow cloth film structure is fixed to the inner wall of the tank by a connecting plate. The connecting plate is tilted with the hollow cloth film device, and the connecting plate has an opening on the lower side.

2. The falling film high-efficiency evaporator according to claim 1, characterized in that: The hollow fabric membrane structure includes an upper cover and a lower cover. The top of the upper cover and the bottom of the lower cover are both provided with through holes. The through hole of the uppermost upper cover is connected to the liquid inlet pipe, and the through hole of the lowermost lower cover is connected to the liquid outlet pipe. The through holes of the adjacent lower cover and upper cover are connected by connecting pipes.

3. A falling film high-efficiency evaporator according to claim 2, characterized in that: The upper and lower covers are arranged symmetrically both vertically and horizontally, and both the upper and lower covers are eccentrically conical.

4. A falling film high-efficiency evaporator according to claim 3, characterized in that: The inner walls of both the upper and lower covers are provided with several arc-shaped fabric grooves. The arc-shaped fabric grooves extend from the through hole of the eccentric cone to the large opening of the eccentric cone, and the width of the arc-shaped fabric grooves gradually increases from the through hole of the eccentric cone to the large opening of the eccentric cone.

5. A falling film high-efficiency evaporator according to claim 1, 2, or 3, characterized in that: The inlet pipe is equipped with a membrane applicator that extends out of the inlet pipe. The membrane applicator is conical in shape, and there is a gap between the lower outer edge of the membrane applicator and the inner wall of the inlet pipe. The lower outer edge of the membrane applicator is welded to the inner wall of the inlet pipe by multiple connecting rods.

6. A falling film high-efficiency evaporator according to claim 4, characterized in that: A circulation pipe is provided between the bottom of the tank and the feed pipe, and a circulation pump is provided on the circulation pipe.

7. A falling film high-efficiency evaporator according to claim 4, characterized in that: The connecting plate is welded and fixed to the inner wall of the tank.

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