Double-tower falling film evaporator set

Abstract

The utility model discloses a double-tower falling-film evaporator set which comprises falling-film evaporators, a feeding cover plate used for guiding in materials is installed at the top of each falling-film evaporator, and a conical material distributing hopper and a flow guide frame are installed in each feeding cover plate. A flow guide frame is arranged on the inner side of the top of the falling-film evaporator, a plurality of corrugated heat exchange pipes are uniformly arranged on the inner side of the top of the falling-film evaporator and positioned below the flow guide frame, and the flow guide frame can be used for uniformly distributing and guiding materials into the corrugated heat exchange pipes. Fluid is guided to be evenly dispersed to inlets of all the heat exchange pipes through the dead weight of the liquid and the inclined face of the flow guide frame, local drying or liquid accumulation is avoided, distribution uniformity is improved, movable parts are not needed, the blocking risk is reduced, cleaning and maintaining are easy, liquid film even distribution is achieved, evaporation efficiency is improved, and scaling is reduced.

Description

Technical Field

[0001] This utility model relates to the field of falling film evaporator technology, specifically a dual-tower falling film evaporator assembly. Background Technology

[0002] Falling film evaporators are highly efficient evaporation devices widely used in pharmaceuticals, food, chemicals, and light industry. They are particularly suitable for the evaporation and concentration of heat-sensitive materials. The feed liquid is added from the top of the evaporator and evenly distributed to each heat exchange tube by a liquid distributor. Under the influence of gravity, vacuum induction, and airflow, the feed liquid forms a uniform liquid film on the inner wall of the heat exchange tubes and flows downwards. During this flow, the film is heated by the heating medium (usually steam) on the shell side, and the solvent vaporizes to form secondary steam. As the liquid film flows, the secondary steam and the liquid phase enter the separation chamber of the evaporator together. In the separation chamber, the vapor and liquid are fully separated. After the secondary steam passes through a demister to remove entrained droplets, it enters the condenser for condensation (single-effect operation) or is used as the heating medium for the next effect evaporator (multi-effect operation). The liquid phase is discharged from the separation chamber.

[0003] Currently, traditional porous distributors do not have flow channels on their surface, which can easily lead to uneven distribution of fluid to each heat exchange tube, causing localized drying or liquid accumulation, and subsequent scaling.

[0004] Therefore, a dual-tower falling film evaporator assembly was proposed to solve the above problems. Utility Model Content

[0005] 1. Technical problem to be solved by the utility model

[0006] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a double-tower falling film evaporator group, which aims to solve the problem that the traditional porous distributor in the existing technology does not have a flow guide groove on its surface, which easily leads to the fluid not being evenly distributed to each heat exchange tube, causing local drying or liquid accumulation, and subsequent scaling.

[0007] 2. Technical Solution To achieve the above objectives, this utility model provides the following technical solution:

[0008] A dual-tower falling film evaporator assembly includes a falling film evaporator. The top of the falling film evaporator is equipped with a feed cover for introducing materials. The inside of the feed cover is equipped with a conical distribution hopper and a flow guide. Multiple corrugated heat exchange tubes are evenly installed on the inner side of the top of the falling film evaporator below the flow guide. The flow guide can evenly distribute and guide the materials into the corrugated heat exchange tubes.

[0009] As a preferred embodiment of this utility model, there are two falling film evaporators, and a separator for separating the material after falling film is installed between the two falling film evaporators. Two steam pipes are symmetrically installed on the outer two sides of the separator, and the separator is connected to the bottom of the two sides of the two falling film evaporators respectively through the steam pipes.

[0010] As a preferred embodiment of this utility model, the feed cover plate is used to install and fix the falling film evaporator and the guide frame by bolts. The top of the feed cover plate is provided with a feed pipe, and the inner side of the feed cover plate is provided with a conical feed hopper. The conical feed hopper is composed of multiple conical hoppers of different sizes, and the top of the conical feed hopper is connected to the bottom of the feed pipe.

[0011] As a preferred embodiment of this utility model, the top of the flow guide is provided with multiple V-shaped grooves of decreasing size, and multiple drain ports are provided at equal intervals on the inner bottom of the V-shaped grooves. A semi-circular block is installed at the center of the top of the flow guide, and the drain ports on the inner bottom of the V-shaped grooves are tightly fitted to the top of each corresponding corrugated heat exchange tube.

[0012] As a preferred embodiment of this utility model, the V-shaped grooves on the guide frame correspond one-to-one with the conical hoppers on the conical distributing hopper, and the material distributed by each conical hopper of the conical distributing hopper can flow into the corresponding V-shaped groove when it flows downward.

[0013] As a preferred embodiment of this utility model, a distributor is installed on the inner side of the top of the falling film evaporator, and the corrugated heat exchange tubes are evenly installed in the distributor. The corrugated heat exchange tubes have a certain tilt angle, which is between 10° and 30°. Beneficial effects

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] This invention improves the flow guiding structure of the liquid distributor by adding a V-shaped flow guide frame to the surface of the traditional porous distributor. The liquid's own weight and the inclined surface of the flow guide frame guide the fluid to be evenly distributed to the inlet of each heat exchange tube, avoiding local drying or liquid accumulation, improving the uniformity of distribution, eliminating the need for moving parts, reducing the risk of blockage, facilitating cleaning and maintenance, achieving uniform liquid film distribution, improving evaporation efficiency and reducing scaling. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of a dual-tower falling film evaporator assembly according to the present invention;

[0017] Figure 2 This is a schematic diagram of the unfolded structure of some components of a double-tower falling film evaporator group according to the present invention;

[0018] Figure 3 This is an enlarged schematic diagram of the guide frame structure of a double-tower falling film evaporator group according to this utility model.

[0019] In the diagram: 1. Falling film evaporator; 11. Feed cover plate; 12. Distributor; 13. Corrugated heat exchange tube; 14. Conical feed hopper; 2. Flow guide frame; 21. V-groove; 22. Drain port; 23. Semicircular block; 3. Steam pipe; 4. Separator. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all 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 protection scope of the present utility model. Example

[0021] Please see Figure 1-3 This embodiment provides a dual-tower falling film evaporator assembly, including a falling film evaporator 1. The top of the falling film evaporator 1 is equipped with a feed cover plate 11 for introducing materials. Inside the feed cover plate 11, there is a conical distribution hopper 14 and a flow guide 2. Multiple corrugated heat exchange tubes 13 are evenly installed on the inner side of the top of the falling film evaporator 1, below the flow guide 2. The flow guide 2 can evenly distribute and guide the materials into the corrugated heat exchange tubes 13. When this tower falling film evaporator assembly is in use, by improving the flow guiding structure of the liquid distributor and adding a V-shaped flow guide 2 to the surface of the traditional porous distributor, the liquid's own weight and the inclined surface of the flow guide 2 guide the fluid to be evenly dispersed to the inlet of each heat exchange tube, avoiding local drying or liquid accumulation, improving the uniformity of distribution, eliminating the need for moving parts, reducing the risk of blockage, facilitating cleaning and maintenance, achieving uniform liquid film distribution, improving evaporation efficiency and reducing scaling.

[0022] In this embodiment, as Figure 2 As shown, the feed cover plate 11 is used to install and fix the falling film evaporator 1 and the guide frame 2 by bolts. The top of the feed cover plate 11 is provided with a feed pipe, and the inner side of the feed cover plate 11 is provided with a conical distribution hopper 14. The conical distribution hopper 14 is composed of multiple conical hoppers of different sizes, and the top of the conical distribution hopper 14 is connected to the bottom of the feed pipe. When the material enters the conical distribution hopper 14, the material is evenly distributed to the inner side of each conical hopper through multiple annular grooves at the top of the conical distribution hopper 14, thus achieving preliminary diversion.

[0023] In this embodiment, as Figure 2 and Figure 3As shown, the top of the flow guide 2 is provided with multiple V-shaped grooves 21 of decreasing size. Multiple drain ports 22 are provided at equal intervals on the bottom inner side of the V-shaped grooves 21. A semi-circular block 23 is installed at the center of the top of the flow guide 2. The drain ports on the bottom inner side of the V-shaped grooves 21 are closely fitted to the top of each corresponding corrugated heat exchange tube 13. The V-shaped grooves 21 on the flow guide 2 correspond one-to-one with the conical hoppers on the conical distribution hopper 14. When the material distributed by each conical hopper of the conical distribution hopper 14 flows downward, it can flow into the corresponding V-shaped groove 21. Therefore, the material can be evenly poured into each corrugated heat exchange tube 13 through the conical distribution hopper 14 and the V-shaped grooves 21, avoiding local drying or liquid accumulation and improving the uniformity of distribution.

[0024] In this embodiment, as Figure 2 As shown, a distributor 12 is installed on the inner side of the top of the falling film evaporator 1, and corrugated heat exchange tubes 13 are evenly installed inside the distributor 12. The corrugated heat exchange tubes 13 have a certain tilt angle, which is between 10° and 30°. The inner wall of the corrugated heat exchange tubes 13 enhances the liquid film turbulence and prolongs the residence time. The tilt angle promotes gravity-assisted flow, reduces scaling on the tube wall, and the corrugated structure increases the heat transfer area and improves the heat exchange efficiency.

[0025] Working Principle: In operation, the falling film evaporator unit first enters the conical separation hopper 14. Multiple annular grooves at the top of the hopper 14 evenly distribute the material to the inner side of each conical hopper, achieving initial diversion. Then, the material in each conical hopper is evenly poured into its corresponding V-shaped groove 21, and finally evenly into each corrugated heat exchange tube 13. This prevents localized drying or liquid accumulation, improves distribution uniformity, eliminates the need for moving parts, reduces the risk of clogging, and facilitates cleaning and maintenance. Furthermore, the inner wall of the corrugated heat exchange tube 13 enhances liquid film turbulence, prolongs residence time, and the inclined angle promotes gravity-assisted flow, reducing scaling on the tube walls. The corrugated structure increases the heat transfer area, improving heat exchange efficiency. All technical features in this embodiment can be freely combined according to actual needs.

[0026] The above embodiments are preferred implementations of this utility model. In addition, this utility model can also be implemented in other ways. Any obvious substitutions without departing from the concept of this technical solution are within the protection scope of this utility model.

Claims

1. A dual-tower falling film evaporator assembly, comprising a falling film evaporator (1), characterized in that: The top of the falling film evaporator (1) is equipped with a feed cover plate (11) for introducing materials. Inside the feed cover plate (11) are a conical distribution hopper (14) and a flow guide (2). Multiple corrugated heat exchange tubes (13) are evenly installed on the inner side of the top of the falling film evaporator (1) below the flow guide (2). The flow guide (2) can evenly distribute and guide the materials into the corrugated heat exchange tubes (13).

2. The dual-tower falling film evaporator assembly according to claim 1, characterized in that: There are two falling film evaporators (1). A separator (4) for separating the material after falling film is installed between the two falling film evaporators (1). Two steam pipes (3) are symmetrically installed on the outer two sides of the separator (4). The separator (4) is connected to the bottom of the two sides of the two falling film evaporators (1) through the steam pipes (3).

3. A dual-tower falling film evaporator assembly according to claim 1, characterized in that: The feed cover plate (11) is used to install and fix the falling film evaporator (1) and the guide frame (2) by bolts. The top of the feed cover plate (11) is provided with a feed pipe. The inner side of the feed cover plate (11) is equipped with a conical feed hopper (14). The conical feed hopper (14) is composed of multiple conical hoppers of different sizes, and the top of the conical feed hopper (14) is connected to the bottom of the feed pipe.

4. A dual-tower falling film evaporator assembly according to claim 1, characterized in that: The top of the flow guide (2) is provided with multiple V-shaped grooves (21) of decreasing size. Multiple drain ports (22) are provided at equal intervals on the bottom inner side of the V-shaped grooves (21). A semi-circular block (23) is installed at the center of the top of the flow guide (2). The drain ports on the bottom inner side of the V-shaped grooves (21) are tightly fitted to the top of each corresponding corrugated heat exchange tube (13).

5. A dual-tower falling film evaporator assembly according to claim 1, characterized in that: The V-shaped groove (21) on the guide frame (2) corresponds one-to-one with the conical hopper on the conical hopper (14). When the material distributed by each conical hopper of the conical hopper (14) flows downward, it can flow into the corresponding V-shaped groove (21).

6. A dual-tower falling film evaporator assembly according to claim 1, characterized in that: A distributor (12) is installed on the inner side of the top of the falling film evaporator (1). The corrugated heat exchange tube (13) is evenly installed in the distributor (12). The corrugated heat exchange tube (13) has a certain tilt angle, which is between 10° and 30°.

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