Falling film evaporator with good film distribution effect

Abstract

The utility model discloses a falling film evaporator with a good film distribution effect, which relates to the technical field of falling film evaporators and comprises an evaporator body, a connecting flange is arranged at the upper end of the evaporator body, a top cover is arranged at the upper end of the connecting flange, a pull plug is arranged at the upper end of the top cover, and a plurality of groups of fixing bolts are arranged on the inner side of the top cover. A plurality of sets of connecting pipes are arranged on the outer surface of the lower end of the top cover, arc-shaped limiting check blocks are arranged on the outer surfaces of the lower ends of the connecting pipes, an upper partition plate and a lower partition plate are arranged on the inner side of the evaporator body, and a plurality of sets of heat exchange pipes are arranged between the upper partition plate and the lower partition plate. According to the falling film evaporator with the good film distribution effect, the feed liquid enters the falling film evaporator through the feed liquid inlet through the arranged arc-shaped limiting check block, and due to the structure of the arc-shaped limiting check block, the feed liquid continuously flows down from the inner wall of the heat exchange tube in a film shape along the edge of the bottom of the arc-shaped limiting check block, so that subsequent evaporation and concentration are facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of falling film evaporators, in particular to a falling film evaporator with good film spreading effect. Background Art

[0002] Falling film evaporator is to add the feed liquid from the upper tube box of the falling film evaporator heating chamber, and evenly distribute it to each heat exchange tube through the liquid distribution and film forming device. Under the action of gravity, vacuum induction and airflow, it flows from top to bottom in a uniform film. During the flow, it is heated and vaporized by the shell side heating medium, evaporated and concentrated, and 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 condenser for condensation (single-effect operation) or enters the next-effect evaporator as a heating medium, and the concentrated liquid is obtained at the bottom of the equipment.

[0003] When the existing falling film evaporator is installed and used, after the feed liquid enters the falling film evaporator, it is easy to directly pass through the heat exchange tube and flow out quickly in a columnar shape. In this way, it is impossible to form a film-like flow down the inner wall of the heat exchange tube, which makes the feed liquid unevenly heated and the evaporation and concentration effect is poor. In addition, in the falling film evaporator, the feed liquid and the generated steam will be separated at the bottom of the falling film evaporator. However, as the falling film evaporator continues to operate, the feed liquid and steam will continuously flow into the bottom of the falling film evaporator. If it exceeds the limit, it is easy to block the steam outlet, and it is even more likely to block the heat exchange tube outlet, which will cause a malfunction, bringing certain adverse effects to people's use process. In order to solve the shortcomings of the existing technology, we propose a falling film evaporator with good film-laying effect. Utility Model Content

[0004] The main purpose of the utility model is to provide a falling film evaporator with good film spreading effect, which can effectively solve the problems in the background technology.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A falling film evaporator with good film spreading effect comprises an evaporator body, a connecting flange is arranged at the upper end of the evaporator body, a top cover is arranged at the upper end of the connecting flange, a pull bolt is arranged at the upper end of the top cover, a plurality of sets of fixing bolts are arranged on the inner side of the top cover, a plurality of sets of connecting pipes are arranged on the outer surface of the lower end of the top cover, arc-shaped limiting blocks are arranged on the outer surfaces of the lower ends of the plurality of sets of connecting pipes, an upper partition and a lower partition are arranged on the inner side of the evaporator body, a plurality of sets of heat exchange tubes are arranged between the upper partition and the lower partition, a condensate outlet is arranged on the rear side of the cavity of the upper partition and the heat exchange tube travel, and a liquid inlet is arranged on the rear side of the evaporator body.

[0007] Preferably, two groups of support columns and two groups of auxiliary support columns are symmetrically arranged on the side of the evaporator body, and multiple groups of connecting blocks are arranged between the two groups of support columns and the evaporator body. A liquid outlet is arranged at the bottom end of the evaporator body, and an electromagnetic valve is arranged on the side of the liquid outlet. The lower end of the lower partition and the bottom end of the evaporator body form a separation chamber, a steam outlet is arranged on the rear side of the separation chamber, a water level monitoring gauge is arranged on the inner side of the separation chamber, and a controller is arranged at the other end of the water level monitoring gauge, a display panel is arranged on the inner side of the controller, and multiple groups of control buttons are arranged at the lower end of the display panel. A heating evaporation chamber is arranged on the side of the evaporator body, a shell-side heating medium inlet is arranged at the front end of the heating evaporation chamber, a shell-side heating medium outlet is arranged on the rear side of the heating evaporation chamber, a preheating tube is arranged between the shell-side heating medium inlet and the shell-side heating medium outlet, and the preheating tube is threaded inside the heating evaporation chamber.

[0008] Preferably, a through hole is provided on the inner side of the connecting flange, a through hole is provided on the inner side of the top cover, multiple groups of the fixing bolts are detachably connected to the top cover through the through holes of the top cover, multiple groups of the fixing bolts are detachably connected to the connecting flange through the through holes of the connecting flange, and the top cover is detachably connected to the connecting flange through the fixing bolts.

[0009] Preferably, the bottom ends of the plurality of groups of arc-shaped limiting blocks are respectively located on the inner sides of the heat exchange tubes.

[0010] Preferably, a through hole is provided on the inner side of the evaporator body, and the water level monitoring gauge is connected to the controller through the through hole of the evaporator body.

[0011] Preferably, a through hole is provided on the inner side of the heating evaporation chamber, and the shell-side heating medium inlet and the shell-side heating medium outlet are respectively connected to the preheating tube through the through hole of the heating evaporation chamber.

[0012] Beneficial Effects

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] 1. In the utility model, by setting an arc-shaped limiting block, the feed liquid enters the falling film evaporator through the feed liquid inlet, and cannot quickly enter the interior of the heat exchange tube due to the obstruction of the arc-shaped limiting block, so it will gradually fill the entire upper end of the upper partition, thereby greatly reducing the uneven feed liquid entering each heat exchange tube. Moreover, due to the structure of the arc-shaped limiting block, the feed liquid flows down from the inner wall of the heat exchange tube in a film shape along the bottom edge of the arc-shaped limiting block, which is convenient for subsequent evaporation and concentration.

[0015] 2. In the utility model, a water level monitor is provided, which can detect the liquid level of the feed liquid falling from the heat exchange tube into the separation chamber. When it exceeds a certain level, the water level monitor will send a signal to the controller and display it on the display panel provided on the inner side of the controller to alert the staff so that the electromagnetic valve can be opened in time to adjust the liquid level inside the separation chamber, so that the feed liquid will not block the steam outlet or the heat exchange tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 It is a schematic diagram of the rear structure of the utility model;

[0018] Figure 3 It is a schematic diagram of the internal structure of the utility model;

[0019] Figure 4 It is a schematic diagram of the top cover structure of the utility model.

[0020] In the figure: 1. Evaporator body; 2. Support column; 3. Auxiliary support column; 4. Heating evaporation chamber; 5. Shell side heating medium inlet; 6. Connecting block; 7. Controller; 8. Display panel; 9. Control button; 10. Connecting flange; 11. Upper partition; 12. Heat exchange tube; 13. Lower partition; 14. Separation chamber; 15. Feed liquid outlet; 16. Solenoid valve; 17. Preheating tube; 18. Shell side heating medium outlet; 19. Condensate outlet; 20. Top cover; 21. Feed liquid inlet; 22. Connecting pipe; 23. Arc-shaped limiting block; 24. Pull bolt; 25. Steam outlet; 26. Water level monitoring gauge; 27. Fixing bolt. DETAILED DESCRIPTION

[0021] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0022] Embodiment 1, as Figure 1-4As shown, a falling film evaporator with good film distribution effect includes an evaporator body 1. A heating medium is added to the interior of a preheating tube 17 through a shell side heating medium inlet 5. Heat overflows from the preheating tube 17 and gradually fills the interior of a cavity formed between an upper partition 11 and a lower partition 13. The heat will not spread out due to the obstruction of the upper partition 11 and the lower partition 13, but will only contact and exchange heat with the inner wall of a heat exchange tube 12. The feed liquid enters the interior of the evaporator body 1 from the feed liquid inlet 21. Due to the obstruction of an arc-shaped limiting block 23, the feed liquid cannot quickly enter the interior of the heat exchange tube 12. Under different flow rates, It will gradually fill the entire upper end of the upper partition 11, thus greatly reducing the unevenness of the liquid entering each heat exchange tube 12, and due to the structure of the arc-shaped limiting block 23, the liquid will flow down from the inner wall of the heat exchange tube in a film-like manner along the bottom edge of the arc-shaped limiting block 23, which is convenient for subsequent evaporation and concentration. The top cover 20 can be disassembled and separated from the evaporator body 1 by removing the multiple sets of fixing bolts 27 arranged on the inside, so that the arc-shaped limiting block 23 can be cleaned and maintained to prevent loss and affect the use effect, and the inside of the heat exchange tube 12 can also be cleaned.

[0023] Embodiment 2, as Figure 1-4 As shown, a falling film evaporator with good film spreading effect, the film-like liquid flowing down the inner wall of the heat exchange tube 12 is heated and vaporized, and the generated steam enters the separation chamber 14 together with the excess liquid, and is separated inside the separation chamber 14, and the condensed water generated after the heat exchange will fall along the outer wall of the heat exchange tube 12, and finally be gradually discharged from the condensed water outlet 19, and the steam is discharged through the steam outlet 25. After a long period of accumulation, when the liquid level gradually rises to a certain limit, the water level monitoring meter 26 will transmit a signal to the controller 7, and the signal will be displayed on the display panel 8 arranged on the inner side of the controller 7 to remind the staff to pay attention, so as to open the electromagnetic valve 16 in time through the control button 9 to adjust the liquid level inside the separation chamber 14, so that the liquid will not block the steam outlet 25 or the heat exchange tube 12.

[0024] How it works

[0025] It should be noted that the utility model is a falling film evaporator with good film distribution effect. When in use, heating medium is added to the interior of the preheating tube 17 through the shell side heating medium inlet 5. The heat overflows with the preheating tube 17 and gradually fills the cavity formed between the upper partition 11 and the lower partition 13. The heat will not dissipate due to the obstruction of the upper partition 11 and the lower partition 13, and will only contact and exchange heat with the inner wall of the heat exchange tube 12. The feed liquid enters the interior of the evaporator body 1 from the feed liquid inlet 21. Due to the obstruction of the arc-shaped limiting block 23, it cannot quickly enter the interior of the heat exchange tube 12. Under different flow rates, it will gradually fill the entire upper end of the upper partition 11. This greatly reduces the unevenness of the feed liquid entering each heat exchange tube 12. In addition, due to the structure of the arc-shaped limiting block 23, the feed liquid flows down from the inner wall of the heat exchange tube in a film-like shape along the bottom edge of the arc-shaped limiting block 23, which is convenient for subsequent evaporation and concentration. The top cover 20 can be disconnected from the evaporator by removing the multiple sets of fixing bolts 27 arranged on the inner side. The heat exchanger body 1 is disassembled and separated, so that the arc-shaped limiting block 23 can be cleaned and maintained to prevent loss and affect the use effect. At the same time, the inside of the heat exchange tube 12 can also be cleaned. The film-like liquid flowing down the inner wall of the heat exchange tube 12 is heated and vaporized, and the generated steam enters the separation chamber 14 together with the excess liquid and is separated inside the separation chamber 14. The condensed water generated after heat exchange will fall along the outer wall of the heat exchange tube 12 and finally be gradually discharged from the condensed water outlet 19. The steam is discharged through the steam outlet 25. After a long period of accumulation, when the liquid level gradually rises to a certain limit, the water level monitoring meter 26 will transmit a signal to the controller 7 and display it on the display panel 8 arranged on the inner side of the controller 7 to remind the staff to pay attention, so as to open the electromagnetic valve 16 in time through the control button 9 to adjust the liquid level inside the separation chamber 14. In this way, the liquid will not block the steam outlet 25 or the heat exchange tube 12.

[0026] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A falling film evaporator with good film spreading effect, comprising an evaporator body (1), characterized in that: The upper end of the evaporator body (1) is provided with a connecting flange (10), the upper end of the connecting flange (10) is provided with a top cover (20), the upper end of the top cover (20) is provided with a pull bolt (24), the inner side of the top cover (20) is provided with multiple groups of fixing bolts (27), the lower end outer surface of the top cover (20) is provided with multiple groups of connecting pipes (22), the lower end outer surfaces of the multiple groups of connecting pipes (22) are all provided with arc-shaped limiting blocks (23), the inner side of the evaporator body (1) is provided with an upper partition (11) and a lower partition (13), multiple groups of heat exchange tubes (12) are provided between the upper partition (11) and the lower partition (13), the rear side of the cavity of the upper partition (11) and the heat exchange tube (12) is provided with a condensate outlet (19), and the rear side of the evaporator body (1) is provided with a liquid inlet (21).

2. The falling film evaporator with good film spreading effect according to claim 1, characterized in that: Two groups of support columns (2) and two groups of auxiliary support columns (3) are symmetrically arranged on the side of the evaporator body (1); a plurality of groups of connection blocks (6) are arranged between the two groups of support columns (2) and the evaporator body (1); a liquid outlet (15) is arranged at the bottom end of the evaporator body (1); an electromagnetic valve (16) is arranged on the side of the liquid outlet (15); the lower end of the lower partition (13) and the bottom end of the evaporator body (1) form a separation chamber (14); a steam outlet (25) is arranged on the rear side of the separation chamber (14); a water level monitoring gauge (26) is arranged on the inner side of the separation chamber (14); and the water level monitoring gauge (26) is arranged on the inner side of the separation chamber (14). A controller (7) is provided at the other end of the meter (26), a display panel (8) is provided on the inner side of the controller (7), and a plurality of control buttons (9) are provided at the lower end of the display panel (8). A heating evaporation chamber (4) is provided on the side of the evaporator body (1), a shell-side heating medium inlet (5) is provided at the front end of the heating evaporation chamber (4), and a shell-side heating medium outlet (18) is provided at the rear side of the heating evaporation chamber (4). A preheating tube (17) is provided between the shell-side heating medium inlet (5) and the shell-side heating medium outlet (18), and the preheating tube (17) is threaded inside the heating evaporation chamber (4).

3. The falling film evaporator with good film spreading effect according to claim 1, characterized in that: A through hole is provided on the inner side of the connecting flange (10), a through hole is provided on the inner side of the top cover (20), a plurality of sets of fixing bolts (27) are detachably connected to the top cover (20) through the through holes of the top cover (20), a plurality of sets of fixing bolts (27) are detachably connected to the connecting flange (10) through the through holes of the connecting flange (10), and the top cover (20) is detachably connected to the connecting flange (10) through the fixing bolts (27).

4. The falling film evaporator with good film spreading effect according to claim 1, characterized in that: The bottom ends of the plurality of groups of arc-shaped limiting blocks (23) are respectively located on the inner side of the heat exchange tube (12).

5. The falling film evaporator with good film spreading effect according to claim 2, characterized in that: A through hole is provided on the inner side of the evaporator body (1), and the water level monitoring meter (26) is connected to the controller (7) through the through hole of the evaporator body (1).

6. The falling film evaporator with good film spreading effect according to claim 2, characterized in that: A through hole is provided on the inner side of the heating evaporation chamber (4), and the shell-side heating medium inlet (5) and the shell-side heating medium outlet (18) are respectively connected to the preheating tube (17) through the through hole of the heating evaporation chamber (4).

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