Inlet falling film structure

Abstract

The utility model relates to an inlet falling film structure which comprises a shell, a tube plate and an inlet falling film assembly arranged in the shell, the inlet falling film assembly comprises a tube pass medium inlet tube, a tube pass medium inlet tube fixing support, an overflow cylinder piece, a first chord tooth plate and a second chord tooth plate, one free tail end of the tube pass medium inlet tube extends out of the shell, and the other free tail end of the tube pass medium inlet tube extends out of the shell. The other free tail end of the tube pass medium inlet tube is provided with a tube pass medium outlet piece, the tube pass medium outlet piece is located in the overflow cylinder piece, the first chord tooth plate and the second chord tooth plate are supported above the tube plate and located on the two sides of the overflow cylinder piece respectively, and the tube plate is provided with a plurality of heat exchange tube holes and a plurality of supporting studs. The overflow cylinder part is supported on a plurality of supporting studs of the tube plate, the upper surfaces of the first chord tooth plate and the second chord tooth plate are inclined planes, and the inclination direction meets the requirement that the position close to a heat exchange tube hole is low and the position away from the heat exchange tube hole is high, so that bubbles in a liquid film are greatly reduced, and the heat exchange efficiency is guaranteed.

Description

[Technical field]

[0001] The utility model relates to the field of heat exchangers, in particular to an inlet falling film structure of a heat exchanger. [Background technology]

[0002] Heat exchanger is a device that transfers part of the heat of hot fluid to cold fluid, also known as heat exchanger. Heat exchanger plays an important role in chemical, petroleum, power, food and many other industrial production. In chemical production, heat exchanger can be used as heater, cooler, condenser, evaporator and reboiler, etc., and is widely used.

[0003] The shell and tube heat exchanger is mainly composed of a shell, a tube bundle, a tube sheet and a head. The two fluids exchanging heat in the shell and tube heat exchanger, one flows inside the tube, and its travel is called the tube side; the other flows outside the tube, and its travel is called the shell side. The wall surface of the tube bundle is the heat transfer surface. Please refer to the prior art (CN118089443A), which discloses a falling film heat exchanger structure in the prior art, and its liquid film distributor includes a liquid distribution pipe and a liquid distribution pipe. The defects of this structure are: 1. The structure of this liquid film distributor is relatively complex and the manufacturing cost is high; 2. This liquid film distributor does not have a buffering function, so the liquid film entering the heat exchange tube will carry bubbles, thereby affecting the heat exchange efficiency.

[0004] Therefore, it is necessary to provide an inlet falling film structure that solves the above technical problems. [Contents of the utility model]

[0005] In order to solve the above problems, the utility model aims to provide an inlet falling film structure which has a buffering function and can reduce bubbles in the liquid film.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: an inlet falling film structure, comprising: a shell, a tube sheet and an inlet falling film assembly arranged in the shell, the inlet falling film assembly comprises a tube-side medium inlet pipe, a tube-side medium inlet pipe fixing bracket, an overflow cylinder, a first chordal tooth plate and a second chordal tooth plate, one of the free ends of the tube-side medium inlet pipe extends out of the shell, the other free end of the tube-side medium inlet pipe is provided with a tube-side medium outlet piece, the tube-side medium outlet piece is located in the overflow cylinder piece, and the bottom of the overflow cylinder piece is provided with a tube-side medium outlet piece. A bottom sealing plate is provided at the top of the overflow cylinder, an overflow opening is provided at the top of the first chord tooth plate and the second chord tooth plate are supported on the top of the tube sheet and are respectively located on both sides of the overflow cylinder, a plurality of heat exchange tube holes and a plurality of supporting studs are provided on the tube sheet, the plurality of heat exchange tube holes are located between the first chord tooth plate and the second chord tooth plate, the overflow cylinder is supported on a plurality of supporting studs of the tube sheet, the upper surfaces of the first chord tooth plate and the second chord tooth plate are both inclined, and the inclination direction satisfies that the position close to the heat exchange tube hole is low and the position away from the heat exchange tube hole is high.

[0007] Preferably, an inlet falling film structure in the utility model is further configured as follows: the number of the tube-side medium inlet pipes is two.

[0008] Preferably, an inlet falling film structure in the utility model is further configured as follows: two tube-side medium inlet pipes are arranged in parallel.

[0009] Preferably, an inlet falling film structure in the utility model is further configured as follows: the tube-side medium outlet member includes: a first support ring plate, a second support ring plate, a first reinforcing rib and a second reinforcing rib, the first support ring plate is welded to the free end of the tube-side medium inlet pipe, the first reinforcing rib and the second reinforcing rib are arranged vertically in a cross, and the first reinforcing rib and the second reinforcing rib are arranged between the first support ring plate, the second support ring plate and the tube-side medium inlet pipe.

[0010] Preferably, an inlet falling film structure in the utility model is further configured as follows: the tube-side medium inlet pipe fixing bracket includes: a supporting channel steel member, a first bracket for connecting the supporting channel steel member and the shell, and a second bracket for connecting the supporting channel steel member and the tube-side medium inlet pipe.

[0011] Preferably, an inlet falling film structure in the utility model is further configured as follows: the first bracket is welded to the inner wall of the shell, the first bracket includes a first support plate, a second support plate and a bottom plate welded between the first support plate and the second support plate, and the support channel steel member is connected to the bottom plate by a first fixing member.

[0012] Preferably, an inlet falling film structure in the utility model is further configured as follows: the second bracket includes a connecting plate welded to the tube-side medium inlet pipe and a third support plate welded perpendicularly to the connecting plate, the connecting plate and the supporting channel steel member are connected by a second fixing member, and the third support plate and the supporting channel steel member are connected by a third fixing member.

[0013] Preferably, an inlet falling film structure in the utility model is further configured as follows: the inclinations of the upper surfaces of the first chordal tooth plate and the second chordal tooth plate are both 5° to 6°.

[0014] Preferably, an inlet falling film structure in the utility model is further configured as follows: the tube-side medium inlet pipe includes: a first connecting pipe, a second connecting pipe, a first elbow, a second elbow and a third connecting pipe.

[0015] Compared with the prior art, the utility model has the following beneficial effects: the inlet falling film structure in the utility model is simple in structure and easy to install. By designing the tube-side medium inlet pipe as a plurality of elbow structures and providing the first chord tooth plate and the second chord tooth plate with an inclined upper surface, the tube-side medium can be well buffered before entering the heat exchange tube for film spreading, thereby greatly reducing the bubbles in the liquid film and ensuring the heat exchange efficiency. In addition, the inlet falling film structure in the utility model is provided with a tube-side medium outlet at the free end of the tube-side medium inlet pipe, so that the tube-side medium can enter the overflow cylinder more dispersedly, reducing the impact on the overflow cylinder and extending the service life of the overflow cylinder.

Brief Description of the Drawings

[0016] Figure 1 It is a schematic diagram of the main structure of the imported falling film structure in the utility model.

[0017] Figure 2 For along Figure 1 Schematic diagram of the cross-sectional structure along line AA shown.

[0018] Figure 3 For along Figure 1 Schematic diagram of the cross-sectional structure along line BB shown.

[0019] Figure 4 It is a schematic diagram of the connection structure between the medium inlet pipe and the supporting channel steel member in the middle pipe pass of the utility model.

[0020] Figure 5 This is a schematic diagram of the main structure of the medium outlet piece in the middle pipe of the utility model.

[0021] Figure 6 It is a schematic diagram of the top view of the structure of the medium outlet piece in the middle pipe of the utility model.

[0022] Figure 7 It is a schematic diagram of the connection structure between the first bracket and the supporting channel steel member in the utility model.

[0023] Figure 8 It is a schematic diagram of the structure of the first chord tooth plate.

[0024] Figures 1 to 8In: 1. Shell, 2. Tube-side medium inlet pipe, 20. First connecting pipe, 21. Second connecting pipe, 22. First elbow, 23. Second elbow, 24. Third connecting pipe, 3. Tube-side medium inlet pipe fixing bracket, 30. Support channel steel, 31. First bracket, 310. First support plate, 311. Second support plate, 312. Bottom plate, 32. Second bracket, 320. Connecting plate, 321. Third support plate, 33. First fixing member, 34. Second fixing member, 35. Third fixing member, 4. Overflow cylinder, 40. Bottom sealing plate, 41. Overflow opening, 5. First chord tooth plate, 6. Second chord tooth plate, 7. Tube-side medium outlet member, 70. First support ring plate, 71. Second support ring plate, 72. First reinforcing rib, 73. Second reinforcing rib, 8. Tube sheet, 80. Heat exchange tube hole, 81. Support stud. [Specific implementation method]

[0025] The inlet falling film structure of the utility model is further described in detail below through specific embodiments.

[0026] Ginseng Figures 1 to 8 As shown, an inlet falling film structure comprises: a shell 1, a tube sheet 8 and an inlet falling film assembly arranged in the shell 1, the inlet falling film assembly comprises a tube-side medium inlet pipe 2, a tube-side medium inlet pipe fixing bracket 3, an overflow cylinder 4, a first chordal tooth plate 5 and a second chordal tooth plate 6. In this embodiment, the number of the tube-side medium inlet pipes 2 is two, and the two tube-side medium inlet pipes 2 are arranged in parallel. The tube-side medium inlet pipe 2 comprises: a first connecting pipe 20, a second connecting pipe 21, a first elbow 22, a second elbow 23 and a third connecting pipe 24. The reason for setting two elbows is to enable the pipe-side medium to obtain the first buffer in the pipe-side medium inlet pipe 2. One of the free ends of the pipe-side medium inlet pipe 2 extends out of the shell 1, and the other free end of the pipe-side medium inlet pipe 2 is provided with a pipe-side medium outlet piece 7. The pipe-side medium outlet piece 7 is located in the overflow cylinder 4. The function of the pipe-side medium outlet piece 7 is to allow the pipe-side medium to enter the overflow cylinder 4 in a more dispersed manner, thereby avoiding the pipe-side medium from causing impact on the overflow cylinder 4, thereby extending the service life of the overflow cylinder 4. The tube-side medium outlet member 7 comprises: a first support ring plate 70, a second support ring plate 71, a first reinforcing rib 72 and a second reinforcing rib 73. The first support ring plate 70 is welded to the free end of the tube-side medium inlet pipe 2. The first reinforcing rib 72 and the second reinforcing rib 73 are arranged vertically in a cross shape. The first reinforcing rib 72 and the second reinforcing rib 73 are arranged between the first support ring plate 70, the second support ring plate 71 and the tube-side medium inlet pipe 2. The arrangement of the first reinforcing rib 72 and the second reinforcing rib 73 not only plays a role in strengthening the connection between the first support ring plate 70, the second support ring plate 71 and the tube-side medium inlet pipe 2, but also plays a role in dispersing the tube-side medium.

[0027] A bottom sealing plate 40 is provided at the bottom of the overflow cylinder 4, and an overflow opening 41 is provided at the top of the overflow cylinder 4. The first chordal tooth plate 5 and the second chordal tooth plate 6 are supported on the top of the tube sheet and are respectively located on both sides of the overflow cylinder 4. A plurality of heat exchange tube holes 80 and a plurality of supporting studs 81 are provided on the tube sheet 8. The plurality of heat exchange tube holes 80 are located between the first chordal tooth plate 5 and the second chordal tooth plate 6. The overflow cylinder 4 is supported on the plurality of supporting studs 81 of the tube sheet 8. The upper surfaces of the first chordal tooth plate 5 and the second chordal tooth plate 6 are both inclined. In this embodiment, the inclination of the upper surfaces of the first chordal tooth plate 5 and the second chordal tooth plate 6 are both 5° to 6°, and the inclination direction satisfies that the position close to the heat exchange tube hole 80 is low and the position away from the heat exchange tube hole 80 is high. The advantage of such an inclined setting is that it is convenient for the tube side medium to flow from the outside to the inside to the heat exchange tube hole 80 in the middle of the tube sheet.

[0028] The pipe-side medium inlet pipe fixing bracket 3 includes: a support channel steel member 30, a first bracket 31 for connecting the support channel steel member 30 with the shell 1, and a second bracket 32 ​​for connecting the support channel steel member 30 with the pipe-side medium inlet pipe 2. The first bracket 31 is welded to the inner wall of the shell 1, and the first bracket 31 includes a first support plate 310, a second support plate 311, and a bottom plate 312 welded between the first support plate 310 and the second support plate 311. The support channel steel member 30 and the bottom plate 312 are connected by a first fixing member 33. In this embodiment, the first fixing member 33 is a bolt and a nut. The second bracket 32 ​​includes a connecting plate 320 welded to the pipe-side medium inlet pipe 2 and a third supporting plate 321 vertically welded to the connecting plate 320. The connecting plate 320 and the support channel steel member 30 are connected by a second fixing member 34, and the third supporting plate 321 and the support channel steel member 30 are connected by a third fixing member 35. In this embodiment, the second fixing member 34 and the third fixing member 35 are both bolts and nuts.

[0029] The working principle of the inlet falling film structure in the utility model is as follows: the tube-side medium enters the tube through the tube-side medium inlet pipe 2, and the arrangement of the first elbow 22 and the second elbow 23 enables the tube-side medium to obtain the first buffer in the tube, and then disperses into the overflow cylinder 4 through the tube-side medium outlet member 7. When the tube-side medium liquid level in the overflow cylinder 4 becomes higher and higher, the tube-side medium overflows onto the first chord tooth plate 5 and the second chord tooth plate 6. Since the first chord tooth plate 5 and the second chord tooth plate 6 are arranged to be high outside and low inside, the tube-side medium falling onto the first chord tooth plate 5 and the second chord tooth plate 6 naturally flows from outside to inside toward the heat exchange tube hole 80 in the middle of the tube plate 8, and then enters the heat exchange tube through the film spreader (not shown) arranged at the heat exchange tube hole 80 to spread the film. The arrangement of the first chord tooth plate 5 and the second chord tooth plate 6 enables the tube-side medium to obtain the second buffer. After the tube-side medium is buffered twice, it enters the heat exchange tube for film spreading, which can greatly reduce the bubbles in the liquid film, thereby ensuring the heat exchange efficiency of the heat exchange tube.

[0030] In summary, the inlet falling film structure in the utility model is simple in structure and easy to install. By designing the tube-side medium inlet pipe 2 as a plurality of elbow structures, and setting the first chord tooth plate 5 and the second chord tooth plate 6 with an inclined upper surface, the tube-side medium can be well buffered before entering the heat exchange tube for film spreading, thereby greatly reducing the bubbles in the liquid film and ensuring the heat exchange efficiency. In addition, the inlet falling film structure in the utility model is provided with a tube-side medium outlet member 7 at the free end of the tube-side medium inlet pipe 2, so that the tube-side medium can enter the overflow cylinder 4 in a more dispersed manner, reducing the impact on the overflow cylinder 4 and extending the service life of the overflow cylinder 4.

[0031] The above-mentioned embodiments are only illustrative of the principles and effects of the invention of the utility model, as well as some embodiments of its application, and are not intended to limit the invention of the utility model. It should be pointed out that a person skilled in the art can make several modifications and improvements without departing from the inventive concept of the invention, and these all fall within the scope of protection of the invention.

Claims

1. An imported falling film structure, comprising: A shell, a tube sheet and an inlet falling film assembly arranged in the shell, characterized in that: the inlet falling film assembly comprises a tube-side medium inlet pipe, a tube-side medium inlet pipe fixing bracket, an overflow cylinder, a first chordal tooth plate and a second chordal tooth plate, one of the free ends of the tube-side medium inlet pipe extends out of the shell, the other free end of the tube-side medium inlet pipe is provided with a tube-side medium outlet piece, the tube-side medium outlet piece is located in the overflow cylinder, the bottom of the overflow cylinder is provided with a bottom sealing plate, the top of the overflow cylinder is provided with an overflow opening, the first chordal tooth plate and the second chordal tooth plate are supported above the tube sheet and are respectively located on both sides of the overflow cylinder, a plurality of heat exchange tube holes and a plurality of support studs are provided on the tube sheet, the plurality of heat exchange tube holes are located between the first chordal tooth plate and the second chordal tooth plate, the overflow cylinder is supported on a plurality of support studs of the tube sheet, the upper surfaces of the first chordal tooth plate and the second chordal tooth plate are both inclined, and the inclination direction satisfies that the position close to the heat exchange tube hole is low and the position away from the heat exchange tube hole is high.

2. An inlet falling film structure as claimed in claim 1, characterized in that: The number of the tube-side medium inlet pipes is two.

3. An inlet falling film structure as claimed in claim 2, characterized in that: The medium inlet pipes of the two tube passes are arranged in parallel.

4. The inlet falling film structure according to claim 1, characterized in that: The tube-side medium outlet member includes: a first support ring plate, a second support ring plate, a first reinforcing rib and a second reinforcing rib. The first support ring plate is welded to the free end of the tube-side medium inlet pipe. The first reinforcing rib and the second reinforcing rib are arranged vertically in a cross shape. The first reinforcing rib and the second reinforcing rib are arranged between the first support ring plate, the second support ring plate and the tube-side medium inlet pipe.

5. The inlet falling film structure according to claim 1, characterized in that: The pipe-side medium inlet pipe fixing bracket comprises: a supporting channel steel piece, a first bracket for connecting the supporting channel steel piece and the shell, and a second bracket for connecting the supporting channel steel piece and the pipe-side medium inlet pipe.

6. An inlet falling film structure as claimed in claim 5, characterized in that: The first bracket is welded to the inner wall of the shell, and the first bracket includes a first support plate, a second support plate and a bottom plate welded between the first support plate and the second support plate. The support channel steel member is connected to the bottom plate via a first fixing member.

7. An inlet falling film structure as claimed in claim 5, characterized in that: The second bracket includes a connecting plate welded to the pipe-side medium inlet pipe and a third supporting plate welded perpendicularly to the connecting plate. The connecting plate is connected to the supporting channel steel member via a second fixing member, and the third supporting plate is connected to the supporting channel steel member via a third fixing member.

8. The inlet falling film structure according to claim 1, characterized in that: The inclinations of the upper surfaces of the first chord tooth plate and the second chord tooth plate are both 5° to 6°.

9. The inlet falling film structure according to claim 1, characterized in that: The pipe-side medium inlet pipe comprises: a first connecting pipe, a second connecting pipe, a first elbow, a second elbow and a third connecting pipe.

Images