Film distributor of falling film evaporator

Abstract

The utility model belongs to the technical field of evaporation equipment, in particular to a film distributor of a falling film evaporator, which is characterized in that a heat exchange tube fixedly connected with an upper tube plate in the falling film evaporator is inserted into the lower end of a fixed tube and is kept relatively fixed, and the lower end of an adjusting tube is inserted into the upper end of the fixed tube and is kept relatively fixed; the inner wall face of the lower end of the fixing pipe is provided with a reducing section, the upper end face of the heat exchange pipe and the reducing section of the inner wall face of the lower end of the fixing pipe are extruded to form linear sealing, and the inner wall face of the upper end of the fixing pipe and the outer surface of the lower end of the adjusting pipe are sealed. A tangential groove for overflowing materials is formed in the upper end of the adjusting pipe in the circumferential direction, and the inner wall surface of the lower end of the adjusting pipe is a conical surface A. According to the utility model, materials can be effectively prevented from entering the heat exchange tube from the space between the fixed tube and the heat exchange tube as well as the space between the adjusting tube and the fixed tube, and the materials are ensured to completely enter the film distributor from the tangential groove arranged at the upper end of the adjusting tube and flow into the inner wall of the heat exchange tube along the inner wall of the film distributor; a uniform and stable liquid film is formed along the inner wall of the heat exchange tube from top to bottom.

Description

Technical Field

[0001] The utility model belongs to the technical field of evaporation equipment, in particular to a film distributor of a falling film evaporator. Background Art

[0002] Falling film evaporator is widely used for evaporation and concentration of water or organic solvent solution in medicine, food, chemical industry, light industry and other industries, and can be widely used for waste liquid treatment in the above industries. It is especially suitable for heat-sensitive materials. The equipment operates continuously under vacuum and low temperature conditions, has high evaporation capacity, energy saving and consumption reduction, low operating cost, and can ensure that the material does not change during the evaporation process.

[0003] The material of the falling film evaporator is added from the top of the evaporator, and falls in the form of a film along the inner wall of the heat exchange tube under the action of gravity, and evaporates in the process. The material flows in the evaporator in the form of a film, with a high heat transfer coefficient and a short residence time. It is not easy to cause material deterioration and is suitable for processing heat-sensitive materials. However, if the material is unevenly distributed during the evaporation operation, and the film fails to form evenly on the tube wall, or the film formation of each heat exchange tube is not synchronized, the heat transfer coefficient will decrease, the evaporation effect will be poor, and even the evaporation operation cannot be carried out. Therefore, in order to make the solution evenly film on the wall of the heat exchange tube, an efficient film distributor must be installed on the upper end of the heat exchange tube. Traditional film distributors are mostly welded with the heat exchange tube, which is not easy to disassemble, clean and replace, and the maintenance cost is high; or they are detachable structures but have no sealing effect, and the material flows in from the gap between the film distributor and the heat exchange tube, affecting the uniformity of film formation. Secondly, errors in the manufacturing process will cause height differences in each heat exchange tube. Since the height of the traditional film spreader cannot be adjusted, the timing of film formation in the heat exchange tube will be inconsistent, resulting in uneven film distribution and affecting the evaporation effect. Utility Model Content

[0004] In view of the above problems existing in traditional film distributors, the utility model aims to provide a film distributor for a falling film evaporator. The film distributor makes the material flow into the heat exchange tube stably and evenly, has high heat exchange efficiency, is more convenient to disassemble, clean and replace, and reduces maintenance costs and installation technical difficulty.

[0005] Another object of the utility model is to provide a film spreading device for a falling film evaporator. The film forming time of the film spreading device is consistent.

[0006] The purpose of this utility model is achieved through the following technical solutions:

[0007] The utility model comprises a fixed tube and an adjusting tube, wherein a heat exchange tube fixedly connected to an upper tube plate in a falling film evaporator is inserted into the lower end of the fixed tube and kept relatively fixed, and the lower end of the adjusting tube is inserted into the upper end of the fixed tube and kept relatively fixed; the inner wall surface of the lower end of the fixed tube has a reduced diameter section, the upper end surface of the heat exchange tube and the reduced diameter section of the inner wall surface of the lower end of the fixed tube are squeezed to form a line seal, and the inner wall surface of the upper end of the fixed tube is sealed with the outer surface of the lower end of the adjusting tube; a tangential groove for overflowing materials is opened along the circumferential direction at the upper end of the adjusting tube, and the inner wall surface of the lower end of the adjusting tube is a conical surface A.

[0008] Wherein: the upper end surface of the fixed tube is an inclined surface, and the outer surface of the adjusting tube is provided with a positioning block, and the positioning block is always in contact with the upper end surface of the fixed tube; after the adjusting tube is inserted into the fixed tube, the positioning block falls on the upper end surface of the fixed tube, and the height of the film spreader is adjusted by rotating the adjusting tube, and the positioning block remains fixed with the fixed tube after being rotated into place, and the positioning block moves along the upper end surface of the fixed tube during the rotation of the adjusting tube.

[0009] The inner wall surface of the upper end of the fixed tube is provided with a stopper, and the stopper is located below the conical surface A. When the positioning block rotates with the adjusting tube to the lowest point of the inclined surface, the lower end surface of the adjusting tube abuts against the stopper, and the adjusting tube is positioned and supported by the stopper and the positioning block.

[0010] The reduced diameter section of the inner wall surface at the lower end of the fixed tube is a conical surface B, the lower end diameter of the conical surface B is larger than the upper end diameter, and the upper end surface of the heat exchange tube is squeezed with the conical surface B to form a line seal.

[0011] An annular groove is formed on the outer surface of the lower end of the adjusting tube, an O-ring is placed in the annular groove, and the outer surface of the lower end of the adjusting tube is sealed with the inner wall surface of the upper end of the fixing tube through the O-ring.

[0012] There are a plurality of tangential grooves which are evenly arranged along the circumferential direction. The tangential grooves are divided into two grooves with different depths, and the grooves with two different depths are arranged at intervals.

[0013] The fixed tube and the heat exchange tube as well as the fixed tube and the regulating tube are fixed by means of top screws.

[0014] The top screws that are kept fixed between the fixed tube and the heat exchange tube are evenly distributed along the circumferential direction.

[0015] The advantages and positive effects of the utility model are:

[0016] 1. The utility model can effectively prevent materials from entering the heat exchange tube from between the fixed tube and the heat exchange tube and between the regulating tube and the fixed tube through the line seal between the lower end of the fixed tube and the heat exchange tube and the O-ring seal between the upper end of the fixed tube and the regulating tube, ensuring that all materials enter the film distributor from the tangential groove arranged at the upper end of the regulating tube, and flow into the inner wall of the heat exchange tube along the inner wall of the film distributor, forming a uniform and stable liquid film from top to bottom along the inner wall of the heat exchange tube.

[0017] 2. The positioning block on the adjusting tube of the utility model cooperates with the upper inclined surface of the fixed tube, which can easily and accurately adjust the height of the film distributor, and place the film distributor connected to each heat exchange tube at the same plane height to ensure the consistency of the film forming timing in each heat exchange tube.

[0018] 3. The tangential groove on the upper end of the regulating tube and the conical surface on the inner wall of the lower end of the utility model can ensure that the material flows directly to the heat exchange tube wall, making the film formation more uniform and improving the heat exchange efficiency.

[0019] 4. The utility model adopts a non-welding structure, which makes it easier to disassemble, clean and replace while ensuring stable, uniform and efficient film formation, and reduces maintenance costs and installation technical difficulty. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a cross-sectional view of the internal structure of the utility model;

[0021] Figure 2 for Figure 1 A-direction view in the figure;

[0022] Figure 3 for Figure 1 Middle B-B sectional view;

[0023] Figure 4 for Figure 1 A partial enlarged view of the upper middle part;

[0024] Figure 5 for Figure 4 A top view of the structure;

[0025] Figure 6 This is a schematic diagram of the structure of the utility model installed on a falling film evaporator;

[0026] Among them: 1 is a fixed tube, 2 is an O-ring, 3 is an adjusting tube, 4 is a positioning block, 5 is a top screw, 6 is a stopper, 7 is a heat exchange tube, 8 is an upper tube plate, 9 is a film distributor, 10 is a tangential groove, 11 is a cone surface A, 12 is a cone surface B, 13 is a feed port, and 14 is an annular groove. DETAILED DESCRIPTION

[0027] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0028] like Figures 1 to 3 As shown, the utility model includes a fixed tube 1 and a regulating tube 3, the heat exchange tube 7 fixedly connected to the upper tube plate 8 in the falling film evaporator is inserted into the lower end of the fixed tube 1 and kept relatively fixed, and the lower end of the regulating tube 3 is inserted into the upper end of the fixed tube 1 and kept relatively fixed; the inner wall surface of the lower end of the fixed tube 1 has a reduced diameter section, the upper end surface of the heat exchange tube 7 and the reduced diameter section of the inner wall surface of the lower end of the fixed tube 1 are squeezed to form a line seal, and the inner wall surface of the upper end of the fixed tube 1 is sealed with the outer surface of the lower end of the regulating tube 3; the upper end of the regulating tube 3 is provided with a tangential groove 10 for overflowing materials along the circumferential direction, and the inner wall surface of the lower end of the regulating tube 3 is a conical surface A11, and the lower end diameter of the conical surface A11 is larger than the upper end diameter.

[0029] In this embodiment, the heat exchange tube 7, the fixed tube 1 and the regulating tube 3 are all hollow circular tubes, and their axial center lines are collinear.

[0030] The upper end face of the fixed tube 1 of this embodiment is an inclined surface, and a positioning block 4 is welded on the outer surface of the adjusting tube 3, and the positioning block 4 always abuts against the upper end face of the fixed tube 1; after the adjusting tube 3 is inserted into the fixed tube 1, the positioning block 4 falls on the upper end face of the fixed tube 1, and the height of the film distributor is adjusted by rotating the adjusting tube 3, and it remains fixed with the fixed tube 1 after rotating in place, and the positioning block 4 moves along the upper end face of the fixed tube 1 during the rotation of the adjusting tube 3. In this embodiment, a stop 6 is provided on the inner wall surface of the upper end of the fixed tube 1, and the stop 6 is located below the conical surface A11. When the positioning block 4 rotates with the adjusting tube 3 to the lowest point of the inclined surface, the lower end face of the adjusting tube 3 abuts against the stop 6, and the adjusting tube 3 is positioned and supported by the stop 6 and the positioning block 4.

[0031] In this embodiment, the reduced diameter section of the inner wall surface of the lower end of the fixed tube 1 is a conical surface B12, the lower end diameter of the conical surface B12 is larger than the upper end diameter, and the upper end surface of the heat exchange tube 7 is squeezed with the conical surface B12 to form a line seal.

[0032] In this embodiment, an annular groove 14 is formed on the outer surface of the lower end of the adjusting tube 3 , and an O-ring 2 is placed in the annular groove 14 . The outer surface of the lower end of the adjusting tube 3 is sealed with the inner wall surface of the upper end of the fixing tube 1 through the O-ring 2 .

[0033] In this embodiment, there are multiple tangential grooves 10, which are evenly arranged along the circumferential direction. The tangential grooves 10 are divided into two grooves with different depths, and the two grooves with different depths are arranged at intervals. Figure 4 , Figure 5 As shown, four tangential grooves 10 with a depth of L1 and four tangential grooves 10 with a depth of L2 are respectively opened at the upper end of the regulating tube 3, and the tangential grooves 10 with a depth of L1 and the tangential grooves 10 with a depth of L2 are arranged at intervals.

[0034] In this embodiment, the fixed tube 1 and the heat exchange tube 7 and the fixed tube 1 and the regulating tube 3 are fixed by means of the top screws 5. The top screws 5 that are fixed between the fixed tube 1 and the heat exchange tube 7 are evenly distributed along the circumferential direction, and the top screws 5 that are fixed between the fixed tube 1 and the regulating tube 3 are only used to restrict the regulating tube 3 from coming out of the fixed tube 1, so the number and the setting position are not required.

[0035] The working principle of the utility model is:

[0036] like Figure 6 As shown, a film distributor 9 is installed on each heat exchange tube 7 in the falling film evaporator, and the material enters the upper tube plate 8 of the tube side from the top of the falling film evaporator through the feed port 13. As the material liquid level rises, when the liquid level reaches the tangential groove 10 opened at the upper end of the regulating tube 3, it will overflow from the tangential groove 10; the tangential grooves 10 opened on the regulating tube 3 are tangentially uniformly distributed, and in each heat exchange tube 7, there is material flowing downward in a film-like manner along the tube wall of the heat exchange tube 7, and the regulating tube 3 is provided with two tangential grooves 10 of different depths. When the material reaches the tangential groove 10 with a deeper depth, less material flows downward, and when more and more material reaches the tangential groove 10 with a shallower depth, more material flows downward; this design is convenient for distributing materials and can make the material distribution in the heat exchange tube 7 more uniform. The conical surface A11 on the inner side of the lower end of the regulating tube 3 can ensure that the material flows downward closely against the tube wall of the regulating tube 3, and finally flows evenly to the heat exchange tube 7 through the fixed tube 1, so that the material flows downward in a film-like manner along the inner wall of the heat exchange tube 7.

[0037] The positioning block 4 on the regulating tube 3 cooperates with the inclined surface at the upper end of the fixed tube 1 to adjust the height of the film spreader 9, placing the film spreader 9 connected to each heat exchange tube 7 at the same plane height to ensure the consistency of the film forming timing in each heat exchange tube 7.

[0038] The technical solutions disclosed in the present utility model are not limited to the technical solutions disclosed in the above-mentioned implementation modes, but also include technical solutions composed of any combination of the above-mentioned technical features. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications are also regarded as the protection scope of the present utility model.

Claims

1. A film distributor for a falling film evaporator, characterized in that: The invention comprises a fixed tube (1) and a regulating tube (3), wherein a heat exchange tube (7) fixedly connected to an upper tube plate (8) in a falling film evaporator is inserted into the lower end of the fixed tube (1) and maintained relatively fixed, and the lower end of the regulating tube (3) is inserted into the upper end of the fixed tube (1) and maintained relatively fixed; the inner wall surface of the lower end of the fixed tube (1) has a reduced diameter section, the upper end surface of the heat exchange tube (7) and the reduced diameter section of the inner wall surface of the lower end of the fixed tube (1) are squeezed to form a line seal, and the inner wall surface of the upper end of the fixed tube (1) is sealed with the outer surface of the lower end of the regulating tube (3); the upper end of the regulating tube (3) is provided with a tangential groove (10) for overflowing materials along the circumferential direction, and the inner wall surface of the lower end of the regulating tube (3) is a conical surface A (11).

2. The film distributor of the falling film evaporator according to claim 1, characterized in that: The upper end surface of the fixed tube (1) is an inclined surface, and a positioning block (4) is provided on the outer surface of the adjusting tube (3), and the positioning block (4) always abuts against the upper end surface of the fixed tube (1); after the adjusting tube (3) is inserted into the fixed tube (1), the positioning block (4) falls on the upper end surface of the fixed tube (1), and the height of the film spreader is adjusted by rotating the adjusting tube (3), and after being rotated into place, the positioning block (4) remains fixed to the fixed tube (1), and the positioning block (4) moves along the upper end surface of the fixed tube (1) during the process of rotating the adjusting tube (3).

3. The film distributor of the falling film evaporator according to claim 2, characterized in that: The inner wall surface of the upper end of the fixed tube (1) is provided with a stopper (6), and the stopper (6) is located below the conical surface A (11). When the positioning stopper (4) rotates with the adjusting tube (3) to the lowest point of the inclined surface, the lower end surface of the adjusting tube (3) abuts against the stopper (6), and the adjusting tube (3) is positioned and supported by the stopper (6) and the positioning stopper (4).

4. The film distributor of the falling film evaporator according to claim 1, characterized in that: The reduced diameter section of the inner wall surface of the lower end of the fixed tube (1) is a conical surface B (12), the lower end diameter of the conical surface B (12) is larger than the upper end diameter, and the upper end surface of the heat exchange tube (7) and the conical surface B (12) are squeezed to form a line seal.

5. The film distributor of the falling film evaporator according to claim 1, characterized in that: An annular groove (14) is formed on the outer surface of the lower end of the regulating tube (3), an O-ring (2) is placed in the annular groove (14), and the outer surface of the lower end of the regulating tube (3) is sealed with the inner wall surface of the upper end of the fixed tube (1) via the O-ring (2).

6. The film distributor of the falling film evaporator according to claim 1, characterized in that: The tangential grooves (10) are multiple and are evenly arranged along the circumferential direction. The tangential grooves (10) are divided into two types of grooves with different depths, and the grooves with two different depths are arranged at intervals.

7. The film distributor of the falling film evaporator according to claim 1, characterized in that: The fixed tube (1) and the heat exchange tube (7) as well as the fixed tube (1) and the regulating tube (3) are both fixed by means of a top screw (5).

8. The film distributor of the falling film evaporator according to claim 7, characterized in that: The top screws (5) that are kept fixed between the fixed tube (1) and the heat exchange tube (7) are evenly distributed in the circumferential direction.

Images