A multi-effect circulating evaporator device

Abstract

The utility model discloses a kind of multi-effect circulating evaporator devices, including one-effect evaporator, two-effect evaporator, three-effect evaporator and condensing box, the one side of one-effect evaporator is sequentially provided with two-effect evaporator and three-effect evaporator, and the outside of one-effect evaporator, two-effect evaporator and three-effect evaporator is respectively provided with first heating cavity, second heating cavity and third heating cavity, the inside of first heating cavity, second heating cavity and third heating cavity is respectively provided with first heating pipe, second heating pipe and third heating pipe, and the inner side wall of first heating pipe, second heating pipe and third heating pipe is evenly provided with tree branch, channel is formed between the tree branch, the top of three-effect evaporator is connected with condensing box by three times steam pipe. The utility model is installed with one-effect evaporator, two-effect evaporator, three-effect evaporator, first heating pipe, second heating pipe and third heating pipe, so that material is heated more evenly.

Description

Technical Field

[0001] This utility model relates to the field of multi-effect evaporator technology, specifically a multi-effect circulating evaporator device. Background Technology

[0002] Multi-effect circulating evaporator is a high-efficiency and energy-saving evaporation equipment, mainly used in chemical, food, pharmaceutical, and environmental protection industries. It is used to evaporate, concentrate, and crystallize materials. By connecting multiple evaporators in series, the secondary steam generated by the previous evaporator is used as the heating source for the next evaporator, so that the thermal energy of the steam is recycled, thereby improving energy efficiency and reducing steam consumption.

[0003] Taking triple-effect evaporators as an example, the steam in existing triple-effect evaporators is generally directly introduced into the jacket outside the evaporator. The steam diffuses from the inlet to the surrounding area, which easily leads to a gradient of "high temperature near the inlet and low temperature far from the inlet". This causes local overheating of the material (especially high-viscosity materials), which in turn leads to coking and component degradation. Therefore, improvements are needed. Utility Model Content

[0004] The purpose of this invention is to provide a multi-effect circulating evaporator device to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a multi-effect circulating evaporator device, comprising a first-effect evaporator, a second-effect evaporator, a third-effect evaporator, and a condenser. The second-effect evaporator and the third-effect evaporator are sequentially arranged on one side of the first-effect evaporator. A first heating chamber, a second heating chamber, and a third heating chamber are respectively arranged on the outer sides of the first-effect evaporator, the second-effect evaporator, and the third-effect evaporator. A first heating tube, a second heating tube, and a third heating tube are respectively arranged inside the first heating chamber, the second heating tube, and the third heating tube. Tree-like branches are evenly arranged on the inner sidewalls of the first heating tube, and channels are formed between the tree-like branches. The top of the first-effect evaporator is connected to the inlet end of the second heating tube via a primary steam pipe. The top of the second-effect evaporator is connected to the inlet end of the third heating tube via a secondary steam pipe. The top of the third-effect evaporator is connected to the condenser via a tertiary steam pipe.

[0006] As a further technical solution of this utility model, the first heating tube, the second heating tube and the third heating tube are all made of thin-walled alloy, and the inner walls of the first heating tube, the second heating tube and the third heating tube are all composed of a ceramic substrate layer and a polytetrafluoroethylene surface layer.

[0007] As a further technical solution of this utility model, a gas guide pipe is provided on one side of the first-effect evaporator, the second-effect evaporator and the third-effect evaporator, and one end of the gas guide pipe is connected to the condenser box. The gas outlets of the first heating tube, the second heating tube and the third heating tube are all connected to the gas guide pipe, and a booster pump is provided on the gas guide pipe.

[0008] As a further technical solution of this utility model, the condenser box is provided with a condenser tube inside, and the condenser tube is fixed in the condenser box in a "snake" shape.

[0009] As a further technical solution of this utility model, the bottom ends of the first-effect evaporator and the second-effect evaporator are respectively connected to one side of the second-effect evaporator and the third-effect evaporator through liquid guide pipes, and a water pump is provided on each of the liquid guide pipes.

[0010] As a further technical solution of this utility model, a rotating shaft is provided at the central position inside the first-effect evaporator, the second-effect evaporator and the third-effect evaporator, and a scraper is provided on one side of the rotating shaft. The scraper is made of silicone material and is in contact with the inner wall of the first-effect evaporator, the second-effect evaporator and the third-effect evaporator.

[0011] As a further technical solution of this utility model, a driven gear is provided at the top of the rotating shaft, and a driving gear is meshed on one side of the driven gear. A drive motor is fixed on the top of one side of the first-effect evaporator, the second-effect evaporator and the third-effect evaporator. The output end of the drive motor is connected to the driving gear through a roller.

[0012] As a further technical solution of this utility model, a demister is provided at the top of the first-effect evaporator, the second-effect evaporator and the third-effect evaporator, and reinforcing ribs are uniformly arranged inside the demister.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: This multi-effect circulating evaporator device, by installing a first-effect evaporator, a second-effect evaporator, a third-effect evaporator, a first heating chamber, a second heating chamber, a third heating chamber, a first heating tube, a second heating tube, and a third heating tube, with the first, second, and third heating tubes all spirally and tightly fixed to the outer walls of the first-effect, second-effect, and third-effect evaporators, can effectively increase the heat transfer area. Steam heat is directly conducted to the first-effect evaporator through the tube walls, resulting in more uniform heat distribution and avoiding steam diffusion loss from the jacket. The inner walls of the heat pipe and the third heating pipe are evenly distributed with tree-like branches, and channels are formed between the tree-like branches, which makes the contact area between the steam and the pipe wall larger than that of a smooth pipe. The steam can be evenly distributed to all areas of the first heating pipe, the second heating pipe and the third heating pipe, significantly increasing the heat transfer area per unit length, making the material heated more evenly and less prone to local overheating. The inner walls of the first heating pipe, the second heating pipe and the third heating pipe are composed of a ceramic base layer and a polytetrafluoroethylene surface layer. The ceramic base layer provides mechanical strength and high-temperature stability, while the polytetrafluoroethylene surface layer provides corrosion resistance and low surface energy, reducing scale adhesion. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a front view structural diagram of the present utility model; Figure 2 This is a schematic diagram of the cross-sectional structure of the first heating tube of this utility model; Figure 3 This is a schematic cross-sectional view of the single-effect evaporator of this utility model; Figure 4 This is a schematic diagram of the scraper structure of this utility model; Figure 5 This is a top view of the demister structure of this utility model.

[0016] In the diagram: 1. Single-effect evaporator; 2. First heating chamber; 3. First heating tube; 4. Second-effect evaporator; 5. Second heating chamber; 6. Second heating tube; 7. Triple-effect evaporator; 8. Third heating chamber; 9. Third heating tube; 10. Primary steam pipe; 11. Secondary steam pipe; 12. Tertiary steam pipe; 13. Condenser; 14. Condenser tube; 15. Gas guide pipe; 16. Booster pump; 17. Liquid guide pipe; 18. Ceramic substrate layer; 19. Polytetrafluoroethylene surface layer; 20. Tree-like branches; 21. Channel; 22. Drive motor; 23. Rotating shaft; 24. Scraper; 25. Drive gear; 26. Driven gear; 27. Demister; 28. Reinforcing rib. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0018] Please see Figure 1-5 The present invention provides an embodiment of a multi-effect circulating evaporator device, comprising a first-effect evaporator 1, a second-effect evaporator 4, a third-effect evaporator 7, and a condenser box 13. The second-effect evaporator 4 and the third-effect evaporator 7 are sequentially arranged on one side of the first-effect evaporator 1, and a first heating chamber 2, a second heating chamber 5, and a third heating chamber 8 are respectively arranged on the outer side of the first-effect evaporator 1, the second-effect evaporator 4, and the third-effect evaporator 7. A first heating tube 3, a second heating tube 6, and a third heating tube 9 are respectively arranged inside the first heating chamber 2, the second heating chamber 5, and the third heating chamber 8. The material to be processed enters the first-effect evaporator 1, and at the same time, external live steam is introduced into the first heating tube 3 in the first heating chamber 2. The first heating tube 3 is spirally attached to the outer wall of the first-effect evaporator 1. The steam heat is directly conducted to the first-effect evaporator 1 through the tube wall, resulting in a more uniform heat distribution and less steam diffusion loss. The inner walls of the first heating tube 3, the second heating tube 6 and the third heating tube 9 are uniformly provided with tree-like branches 20, and channels 21 are formed between the tree-like branches 20. The contact area between the steam and the tube wall is larger than that of a smooth tube, and the steam can be evenly distributed to all areas of the first heating tube 3. The heat transfer area per unit length is significantly improved, making the material in the first-effect evaporator 1 more evenly heated and less prone to local overheating. The first heating tube 3, the second heating tube 6, and the third heating tube 9 are all made of thin-walled alloy to reduce weight, and the inner walls of the first heating tube 3, the second heating tube 6, and the third heating tube 9 are all composed of a ceramic base layer 18 and a polytetrafluoroethylene surface layer 19. The polytetrafluoroethylene (PTFE) surface layer 19 is disposed outside the ceramic substrate layer 18. The ceramic substrate layer 18 ensures high-temperature stability, while the PTFE surface layer 19 can reduce scaling. The bottom ends of the first-effect evaporator 1 and the second-effect evaporator 4 are respectively connected to one side of the second-effect evaporator 4 and the third-effect evaporator 7 through liquid guide pipes 17, and each liquid guide pipe 17 is equipped with a water pump. The top of the first-effect evaporator 1 is connected to the inlet of the second heating tube 6 through the primary steam pipe 10. The top of the second-effect evaporator 4 is connected to the inlet of the third heating tube 9 through the secondary steam pipe 11. The top of the third-effect evaporator 7 is connected to the condenser box 13 through the tertiary steam pipe 12. The material in the first-effect evaporator 1 is heated and evaporated to generate primary steam. The concentrated material in the first-effect evaporator 1 is transported to the second-effect evaporator 4 by a water pump through the bottom liquid guide pipe 17. The primary steam generated in the first effect is introduced into the second heating pipe 6 in the second heating chamber 5 through the primary steam pipe 10, which serves as the heat source for the second-effect evaporator 4. The above heat transfer process is repeated to make the material in the second-effect evaporator 4 evaporate and generate secondary steam. The concentrated material in the second-effect evaporator 4 is transported to the third-effect evaporator 7 by a water pump through another liquid guide pipe 17. The secondary steam generated in the second effect is introduced into the third heating tube 9 in the third heating chamber 8 through the secondary steam pipe 11, which serves as the heat source for the third-effect evaporator 7. The evaporation of the material in the third-effect evaporator 7 is achieved through the spiral structure, tree-like branches 20, channel 21 and composite inner wall design of the third heating tube 9. A gas guide pipe 15 is provided on one side of the first-effect evaporator 1, the second-effect evaporator 4 and the third-effect evaporator 7, and one end of the gas guide pipe 15 is connected to the condenser box 13. The gas outlets of the first heating tube 3, the second heating tube 6 and the third heating tube 9 are all connected to the gas guide pipe 15. A booster pump 16 is provided on the gas guide pipe 15. The condenser box 13 is equipped with a condenser tube 14 inside, and the condenser tube 14 is fixed in a "snake" shape inside the condenser box 13; Steam from the first heating tube 3, the second heating tube 6, and the third heating tube 9 is collected through the gas guide pipe 15, pressurized by the booster pump 16, and then transported to the condenser box 13 to avoid the accumulation of non-condensable gas that affects heat transfer efficiency. Meanwhile, the tertiary steam generated by the triple-effect evaporator 7 also enters the condenser 13 through the tertiary steam pipe 12. The condenser 13 is equipped with a condenser pipe 14, and cooling water is introduced into the condenser pipe 14 to exchange heat with the steam and condense it into liquid water. The condenser pipe 14 is fixed in the condenser 13 in a "snake" shape, which helps to slow down the flow rate of the cooling water and make the heat exchange more complete. Only one condenser box 13 is needed to collect and condense the excess steam generated by the first-effect evaporator 1, the second-effect evaporator 4 and the third-effect evaporator 7, reducing the number of equipment and floor space, making it especially suitable for space-constrained industrial scenarios. A rotating shaft 23 is provided at the center of the first-effect evaporator 1, the second-effect evaporator 4 and the third-effect evaporator 7, and a scraper 24 is provided on one side of the rotating shaft 23. The scraper 24 is made of silicone material and is in contact with the inner wall of the first-effect evaporator 1, the second-effect evaporator 4 and the third-effect evaporator 7. A driven gear 26 is provided at the top of the rotating shaft 23. A driving gear 25 is meshed on one side of the driven gear 26. A drive motor 22 is fixed on the top of one side of the first-effect evaporator 1, the second-effect evaporator 4 and the third-effect evaporator 7. The output end of the drive motor 22 is connected to the driving gear 25 through a roller. During the evaporation process, the drive motor 22 meshes with the driven gear 26 through the drive gear 25, driving the rotating shaft 23 inside the first-effect evaporator 1, the second-effect evaporator 4, and the third-effect evaporator 7 to rotate. The silicone scraper 24 on one side of the rotating shaft 23 rotates close to the inner wall of the first-effect evaporator 1, the second-effect evaporator 4, and the third-effect evaporator 7, scraping off the scale layer that may form on the material side in real time. The top of the first-effect evaporator 1, the second-effect evaporator 4 and the third-effect evaporator 7 are all equipped with demisters 27. The demister 27 has a through hole in the center for the rotating shaft 23 to pass through. The demister 27 is used to intercept liquid droplets entrained during the evaporation process to prevent the material from entering the next effect or condensation system with the steam and causing loss. The interior of the demister 27 is uniformly equipped with reinforcing ribs 28 to enhance the structural stability. The specific models and specifications of the drive motor 22 and the booster pump 16 need to be determined by selection calculation based on the specifications and parameters of the device. The selection calculation method is existing technology, so it will not be described in detail here.

[0019] Working Principle: In this embodiment, the material to be processed enters the first-effect evaporator 1, while external live steam is introduced into the first heating tube 3 inside the first heating chamber 2. The first heating tube 3 is spirally attached to the outer wall of the first-effect evaporator 1. Its inner wall has tree-like branches 20 and channels 21 to increase the contact area between the steam and the tube wall. The ceramic base layer 18 ensures high-temperature stability, and the polytetrafluoroethylene surface layer 19 reduces scaling. The steam heat is efficiently conducted to the material inside the first-effect evaporator 1 through the tube wall, causing the material to evaporate and generate primary steam. The concentrated material inside the first-effect evaporator 1 is then pumped to the second-effect evaporator through the bottom liquid guide pipe 17. Within the first-effect evaporator 4, the primary steam generated is introduced through the primary steam pipe 10 into the second heating pipe 6 within the second heating chamber 5, serving as the heat source for the second-effect evaporator 4. This heat transfer process is repeated, causing the material within the second-effect evaporator 4 to evaporate and generate secondary steam. The concentrated material within the second-effect evaporator 4 is then transported to the third-effect evaporator 7 via another liquid guide pipe 17, driven by a water pump. The secondary steam generated in the second effect is introduced through the secondary steam pipe 11 into the third heating pipe 9 within the third heating chamber 8, serving as the heat source for the third-effect evaporator 7. Through the spiral structure, tree-like branches 20, channels 21, and composite inner wall design of the third heating pipe 9, the third-effect evaporator 7 achieves triple-effect evaporation. The evaporation of materials inside the evaporator 7 generates tertiary steam. The steam from the first heating tube 3, the second heating tube 6, and the third heating tube 9 is collected through the gas guide pipe 15, pressurized by the booster pump 16, and then transported to the condenser box 13 to prevent the accumulation of non-condensable gases from affecting heat transfer efficiency. At the same time, the tertiary steam generated by the triple-effect evaporator 7 also enters the condenser box 13 through the tertiary steam pipe 12. Cooling water is introduced into the condenser pipe 14 inside the condenser box 13 to exchange heat with the steam and condense it into liquid water. During the evaporation process, the drive motor 22 engages the driven gear 26 through the drive gear 25, driving the internal components of the first-effect evaporator 1, the second-effect evaporator 4, and the triple-effect evaporator 7. The rotating shaft 23 rotates, and the silicone scraper 24 on one side of the rotating shaft 23 rotates in close contact with the inner wall of the first-effect evaporator 1, the second-effect evaporator 4, and the third-effect evaporator 7, scraping off any scale that may form on the material side in real time. At the same time, the demister 27 at the top of the first-effect evaporator 1, the second-effect evaporator 4, and the third-effect evaporator 7 intercepts liquid droplets entrained during the evaporation process, preventing the material from entering the next effect or condensation system with the steam and causing losses. The concentrated liquid is discharged through the bottom of the third-effect evaporator 7, completing the steam circulation of the entire evaporation process. The entire process utilizes multi-effect steam in a stepped manner, combined with efficient heat transfer and anti-scaling design, to achieve low energy consumption and high stability solution concentration.

[0020] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A multi-effect circulating evaporator device, characterized in that, The system includes a first-effect evaporator (1), a second-effect evaporator (4), a third-effect evaporator (7), and a condenser (13). The second-effect evaporator (4) and the third-effect evaporator (7) are sequentially arranged on one side of the first-effect evaporator (1). A first heating chamber (2), a second heating chamber (5), and a third heating chamber (8) are respectively arranged on the outer sides of the first-effect evaporator (1), the second-effect evaporator (4), and the third-effect evaporator (7). A first heating tube (3) and a second heating tube (6) are respectively arranged inside the first heating chamber (2), the second heating chamber (5), and the third heating chamber (8) to... The first heating tube (3), the second heating tube (6) and the third heating tube (9) are provided with tree-like branches (20) evenly arranged on the inner sidewalls. The tree-like branches (20) form channels (21) between each other. The top of the first-effect evaporator (1) is connected to the air inlet of the second heating tube (6) through a primary steam pipe (10). The top of the second-effect evaporator (4) is connected to the air inlet of the third heating tube (9) through a secondary steam pipe (11). The top of the third-effect evaporator (7) is connected to a condenser box (13) through a tertiary steam pipe (12).

2. The multi-effect circulating evaporator device according to claim 1, characterized in that: The first heating tube (3), the second heating tube (6) and the third heating tube (9) are all made of thin-walled alloy, and the inner walls of the first heating tube (3), the second heating tube (6) and the third heating tube (9) are all composed of a ceramic substrate layer (18) and a polytetrafluoroethylene surface layer (19).

3. The multi-effect circulating evaporator device according to claim 1, characterized in that: A gas guide pipe (15) is provided on one side of the first-effect evaporator (1), the second-effect evaporator (4) and the third-effect evaporator (7), and one end of the gas guide pipe (15) is connected to the condenser box (13). The gas outlets of the first heating pipe (3), the second heating pipe (6) and the third heating pipe (9) are all connected to the gas guide pipe (15). A booster pump (16) is provided on the gas guide pipe (15).

4. The multi-effect circulating evaporator device according to claim 1, characterized in that: The condenser box (13) is equipped with a condenser tube (14) inside, and the condenser tube (14) is fixed in the condenser box (13) in a "snake" shape.

5. The multi-effect circulating evaporator device according to claim 1, characterized in that: The bottom ends of the first-effect evaporator (1) and the second-effect evaporator (4) are respectively connected to one side of the second-effect evaporator (4) and the third-effect evaporator (7) through liquid guide pipes (17), and each liquid guide pipe (17) is equipped with a water pump.

6. The multi-effect circulating evaporator device according to claim 1, characterized in that: A rotating shaft (23) is provided at the center of the interior of the first-effect evaporator (1), the second-effect evaporator (4) and the third-effect evaporator (7), and a scraper (24) is provided on one side of the rotating shaft (23). The scraper (24) is made of silicone material and is in contact with the inner wall of the first-effect evaporator (1), the second-effect evaporator (4) and the third-effect evaporator (7).

7. The multi-effect circulating evaporator device according to claim 6, characterized in that: The top of the rotating shaft (23) is provided with a driven gear (26), and a driving gear (25) meshes with one side of the driven gear (26). A drive motor (22) is fixed on the top of one side of the first-effect evaporator (1), the second-effect evaporator (4) and the third-effect evaporator (7). The output end of the drive motor (22) is connected to the driving gear (25) through a roller.

8. The multi-effect circulating evaporator device according to claim 1, characterized in that: The top of the first-effect evaporator (1), the second-effect evaporator (4) and the third-effect evaporator (7) are all provided with demisters (27), and the interior of the demisters (27) is uniformly provided with reinforcing ribs (28).

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