Liquid film-forming evaporation device

Abstract

The invention relates to a liquid film-forming evaporation device which comprises a shell pass barrel, an upper tube box located above the shell pass barrel and a plurality of heat exchange tubes vertically penetrating through the shell pass barrel, the upper ends of the heat exchange tubes penetrate into the upper tube box, a shell pass tube opening is formed in the shell pass barrel, a tube pass tube opening is formed in the upper tube box, and a tube pass tube opening is formed in the tube pass barrel. The upper end of the heat exchange tube is fixedly connected with a tubular falling film head, the lower end of the falling film head vertically penetrates into the upper end of the heat exchange tube, the lower end of the falling film head is provided with a horn mouth, and the outer ring of the horn mouth is concentric with the inner wall of the heat exchange tube. According to the invention, the evaporation time is short, the concentration requirement is met through one-time evaporation, the manufacturing difficulty is low, and large-scale production is facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of evaporation devices, and in particular to a liquid film-forming evaporation device. Background Art

[0002] In the food, chemical, and environmental protection industries, evaporation devices are required. Evaporation devices allow liquid to flow through the inner wall of a high-temperature heat exchange tube and evaporate at high temperature on the inner wall. However, in current evaporation devices, the liquid cannot adhere evenly to the inner wall, resulting in incomplete evaporation and a long evaporation time. The concentration requirement cannot be reached in one evaporation, and multiple evaporations are required. Summary of the invention

[0003] The present invention aims at solving the deficiencies of the prior art and provides a liquid film-forming evaporation device.

[0004] The present invention is achieved through the following technical scheme, which provides a liquid film-forming evaporation device, including a shell-side cylinder, an upper tube box located above the shell-side cylinder, and a plurality of heat exchange tubes vertically passing through the shell-side cylinder, the upper ends of the heat exchange tubes penetrate into the upper tube box, the shell-side cylinder is provided with a shell-side tube opening, the upper tube box is provided with a tube-side tube opening, the upper ends of the heat exchange tubes are fixedly connected with a tubular falling film head, the lower end of the falling film head vertically penetrates into the upper end of the heat exchange tube, the lower end of the falling film head is provided with a bell mouth, and the outer ring of the bell mouth is concentric with the inner wall of the heat exchange tube.

[0005] The material enters the upper tube box in this scheme from the tube port, then enters the upper end of the heat exchange tube, passes through the gap between the bell mouth at the lower end of the falling film head and the heat exchange tube, flows from top to bottom in a uniform film, and is heated and vaporized by the heating medium in the shell cylinder.

[0006] As an optimization, a plurality of support ribs are fixedly connected to the outer side of the falling film head, and the support ribs are fixedly connected to the upper end of the heat exchange tube. The support ribs provided in this solution are used to fix and support the falling film head and allow materials to enter the gap between the falling film head and the heat exchange tube.

[0007] As an optimization, the gap between the outer ring of the bell mouth and the inner wall of the heat exchange tube is 0.2-0.3 mm. The size of the gap is limited in this solution to achieve effective and uniform film formation of the material.

[0008] As an optimization, the outer ring of the lower end of the bell mouth is a cylindrical surface, so that an annular gap is formed between the bell mouth and the heat exchange tube, which is more conducive to liquid film formation.

[0009] As an optimization, the inner and outer sides of the bell mouth are both arc surfaces, so as to facilitate the downward flow of materials.

[0010] As an optimization, the outer diameter of the falling film head is 0.6-0.9 times the inner diameter of the heat exchange tube, which is more conducive to liquid film formation.

[0011] As an optimization, the shell-side cylinder and the upper tube box are separated by an upper tube sheet, and the heat exchange tube seal passes through the upper tube sheet. In this solution, the shell-side cylinder and the upper tube box are separated by the upper tube sheet, so that the material enters the upper end of the heat exchange tube.

[0012] As an optimization, the heat exchange tube is provided with an expansion section located in the upper tube sheet, and the lower end of the bell mouth is located in the expansion section. The expansion section provided in this solution is formed by extruding this part of the heat exchange tube outward, so that the inner diameter and outer diameter of this part are increased, on the one hand, a sealed fixed connection between the heat exchange tube and the upper tube sheet is achieved, and on the other hand, the inner hole is made uniformly circular by expanding the tube, which is convenient for uniform film formation.

[0013] As an optimization, an inlet distributor is fixed in the upper tube box, and the inlet distributor includes a distributor partition and a plurality of distribution pipes vertically passing through the distributor partition, and the upper ends of the plurality of distribution pipes are flush, and the distributor partition divides the upper tube box into an upper cavity and a lower cavity, and the tube pass pipe port is arranged in the upper cavity. The inlet distributor provided in this solution facilitates the uniform falling of materials.

[0014] As an optimization, a central tube partition is fixedly connected in the upper cavity, the tube port is arranged above the central tube partition, and the center of the central tube partition is connected with an upward central tube.

[0015] The beneficial effects of the present invention are as follows: in the liquid film-forming evaporation device of the present invention, the material is evenly distributed in the heat exchange tube by the distributor during evaporation, and passes through the gap between the bell mouth at the lower end of the falling film head and the heat exchange tube, so that it falls in the form of a film. The evaporation time is short, the concentration requirement is achieved by evaporation in one time, the manufacturing difficulty is low, and large-scale production is convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the internal structure of the present invention; Figure 2 For the present invention Figure 1 Enlarged view of part A in the middle; As shown in the figure: 1. Upper tube box, 2. Tube side pipe opening, 3. Upper tube plate, 4. Shell side cylinder, 5. Shell side pipe opening, 6. Heat exchange tube, 61. Expansion tube section, 7. Inlet distributor, 71. Distributor partition, 72. Distribution pipe, 8. Falling film head, 9. Support rib plate, 10. Center tube, 11. Center tube partition. DETAILED DESCRIPTION

[0017] In order to clearly illustrate the technical features of this solution, this solution is described below through a specific implementation method.

[0018] like Figure 1~2As shown, a liquid film-forming evaporation device of the present invention comprises a shell-side cylinder 4 and an upper tube box 1 located above the shell-side cylinder 4, wherein the shell-side cylinder 4 and the upper tube box 1 are separated by an upper tube plate 3. Specifically, Figure 1 As shown, the upper tube sheet 3 is sealed on the upper opening of the shell-side cylinder 4 and fixed by welding, and the lower end opening flange of the upper tube box 1 is connected to the upper tube sheet 3, so that the shell-side cylinder 4 and the upper tube box 1 are respectively closed spaces.

[0019] The upper tube box 1 is provided with a tube-side pipe opening 2 , which is arranged on the side of the upper tube box 1 and is used for materials to enter the upper tube box 1 .

[0020] The upper tube box 1 is fixed with an inlet distributor 7 for making the materials fall evenly. Figure 1 As shown, the inlet distributor 7 includes a distributor partition 71 and a plurality of distribution pipes 72 vertically passing through the distributor partition 71. The distributor partition 71 is a horizontal plate and is located at the bottom of the upper pipe box 1. The distributor partition 71 divides the upper pipe box 1 into an upper cavity and a lower cavity, and the pipe pass orifice 2 is arranged in the upper cavity.

[0021] The upper ends of the plurality of distribution pipes 72 are flush, so the materials fall together from the upper ends of the plurality of distribution pipes 72, thereby making the liquid fall evenly.

[0022] In the present application, a central tube partition 11 is fixedly connected in the upper cavity. The central tube partition 11 is a horizontal plate and is located above the distribution pipe 72. The central tube partition 11 divides the upper cavity into upper and lower parts. The center of the central tube partition 11 is connected to an upward central tube 10. The pipe port 2 is arranged above the central tube partition 11. Therefore, after the material enters the upper part of the central tube partition 11, when the liquid level increases to the upper end of the central tube 10, it falls to the lower part through the central tube 10.

[0023] It also includes a plurality of heat exchange tubes 6 vertically passing through the shell-side cylinder 4, and the upper ends of the plurality of heat exchange tubes 6 are flush. In this embodiment, the heat exchange tubes 6 are sealed and pass through the upper tube plate 3, so that the upper ends of the heat exchange tubes 6 pass through the upper tube box 1. The inner holes of the heat exchange tubes 6 and the inner cavity of the shell-side cylinder 4 are separated by the tube wall of the heat exchange tubes. Therefore, the high-temperature medium passing through the shell-side cylinder 4 can heat the heat exchange tubes 6, so that the materials inside the heat exchange tubes 6 are heated and evaporated.

[0024] The heat exchange tube 6 is provided with an expansion section 61 located in the upper tube plate 3. The thickness of the upper tube plate 3 is greater than the length of the expansion section 61. During processing, the heat exchange tube 6 is first inserted into the circular hole in the upper tube plate 3, and then the portion of the heat exchange tube is squeezed outward to form the expansion section 61. The inner diameter and outer diameter of the expansion section 61 are both increased.

[0025] The shell-side cylinder 4 is provided with a shell-side pipe opening 5 , which is located on the side of the shell-side cylinder 4 , and the heating medium enters through the shell-side pipe opening 5 .

[0026] like Figure 2 As shown, a tubular falling film head 8 is fixedly connected to the upper end of the heat exchange tube 6, and the lower end of the falling film head 8 vertically penetrates into the upper end of the heat exchange tube 6. The falling film head 8 is coaxially arranged with the heat exchange tube 6, and the outer diameter of the falling film head 8 is 0.6-0.9 times the inner diameter of the heat exchange tube 6.

[0027] In order to fix the falling film head 8, a plurality of supporting ribs 9 are fixedly connected to the outside of the falling film head 8, and the supporting ribs 9 are fixedly connected to the upper end of the heat exchange tube 6. In this embodiment, four supporting ribs 9 are arranged and evenly distributed circumferentially, and the material flows into the heat exchange tube 6 from adjacent supporting ribs 9.

[0028] The lower end of the falling film head 8 is provided with a bell mouth located in the expansion tube section 61, the inner and outer sides of the bell mouth are arc surfaces, and the outer ring of the bell mouth is concentric with the inner wall of the heat exchange tube 6. The outer ring of the lower end of the bell mouth is a cylindrical surface. The gap between the outer ring of the bell mouth and the inner wall of the heat exchange tube 6 is 0.2-0.3mm.

[0029] Method of use of the present invention: The feed liquid is added from the tube side pipe port of the upper tube box. After the liquid level exceeds the upper end of the central tube 10, it falls from the central tube 10, then falls evenly through the inlet distributor 7, and is evenly distributed to each heat exchange tube 6. It passes through the gap between the bell mouth at the lower end of the falling film head 8 and the heat exchange tube 6, and flows from top to bottom in a uniform film. During the flow, it is heated and vaporized by the heating medium in the shell side cylinder 4. The generated steam and liquid phase enter the separation chamber of the evaporator together. After the vapor and liquid are fully separated, the steam enters the next-effect evaporator as the heating medium, thereby realizing multi-effect operation, and the liquid phase is discharged from the separation chamber.

[0030] Of course, the above description is not limited to the above examples. Technical features not described in the present invention can be achieved by or by using existing technologies, which will not be described here. The above embodiments and drawings are only used to illustrate the technical scheme of the present invention and are not limitations of the present invention. The present invention is described in detail with reference to the preferred implementation methods. Ordinary technicians in this field should understand that changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention do not depart from the purpose of the present invention, and should also fall within the scope of protection of the claims of the present invention.

Claims

1. A liquid film-forming evaporation device, characterized in that: The invention comprises a shell-side cylinder (4), an upper tube box (1) located above the shell-side cylinder (4), and a plurality of heat exchange tubes (6) vertically passing through the shell-side cylinder (4), wherein the upper ends of the heat exchange tubes (6) pass through the upper tube box (1), the shell-side cylinder (4) is provided with a shell-side tube opening (5), the upper tube box (1) is provided with a tube-side tube opening (2), the upper ends of the heat exchange tubes (6) are fixedly connected with a tubular falling film head (8), the lower ends of the falling film heads (8) vertically pass through the upper ends of the heat exchange tubes (6), the lower ends of the falling film heads (8) are provided with a bell mouth, and the outer ring of the bell mouth is concentric with the inner wall of the heat exchange tube (6).

2. The liquid film-forming evaporation device according to claim 1, characterized in that: A plurality of supporting ribs (9) are fixedly connected to the outer side of the falling film head (8), and the supporting ribs (9) are fixedly connected to the upper end of the heat exchange tube (6).

3. The liquid film-forming evaporation device according to claim 1, characterized in that: The gap between the outer ring of the bell mouth and the inner wall of the heat exchange tube (6) is 0.2-0.3 mm.

4. The liquid film-forming evaporation device according to claim 1, characterized in that: The outer circle at the lower end of the bell mouth is a cylindrical surface.

5. The liquid film-forming evaporation device according to claim 1, characterized in that: The inner side and the outer side of the bell mouth are both arc surfaces.

6. The liquid film-forming evaporation device according to claim 1, characterized in that: The outer diameter of the falling film head (8) is 0.6-0.9 times the inner diameter of the heat exchange tube (6).

7. The liquid film-forming evaporation device according to claim 1, characterized in that: The shell-side cylinder (4) and the upper tube box (1) are separated by an upper tube plate (3), and the heat exchange tube (6) passes through the upper tube plate (3) in a sealed manner.

8. The liquid film-forming evaporation device according to claim 7, characterized in that: The heat exchange tube (6) is provided with an expansion tube section (61) located inside the upper tube plate (3), and the lower end of the bell mouth is located inside the expansion tube section (61).

9. The liquid film-forming evaporation device according to claim 1, characterized in that: An inlet distributor (7) is fixedly connected to the upper tube box (1), and the inlet distributor (7) comprises a distributor partition (71) and a plurality of distribution pipes (72) vertically passing through the distributor partition (71), and the upper ends of the plurality of distribution pipes (72) are flush, and the distributor partition (71) divides the upper tube box (1) into an upper cavity and a lower cavity, and the tube side pipe port (2) is arranged in the upper cavity.

10. The liquid film-forming evaporation device according to claim 9, characterized in that: A central tube partition (11) is fixedly connected in the upper cavity, a tube-side pipe port (2) is arranged above the central tube partition (11), and an upward central tube (10) is connected to the center of the central tube partition (11).

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