Horizontal tube falling film evaporator

Abstract

The utility model discloses a horizontal tube falling-film evaporator which comprises a cylindrical shell, two circular partition plates are installed in the cylindrical shell, a tube bundle is installed between the two circular partition plates, two screws are rotatably installed on the inner side of the cylindrical shell through bearing seats, the two screws are both located between the two circular partition plates, and the two screws are connected with the two circular partition plates. The two screws are arranged in the cylindrical shell and are symmetrical about the central axis of the cylindrical shell, threaded cylinders are arranged on the two screws, the periphery of the tube bundle is sleeved with an annular tube, the annular tube and the two threaded cylinders are fixed through fixing pieces, and a circle of high-pressure nozzles are installed on the inner side of the annular tube. According to the horizontal tube falling film evaporator, the motor is arranged to drive the screw rod to rotate, then the screw rod is matched with the threaded barrel, the threaded barrel can be controlled to drive the annular tube to horizontally move back and forth on the tube bundle, the high-pressure spray heads are installed on the inner side of the annular tube, and a cleaning agent or water is pumped into the annular tube, so that the tube bundle can be washed in all directions.

Description

Technical Field

[0001] The utility model relates to the technical field of evaporators, in particular to a horizontal tube falling film evaporator. Background Art

[0002] The horizontal tube falling film evaporator, also known as the horizontal tube external spray type falling film evaporator, is mainly used for the primary concentration of low-concentration solutions and is commonly used in fields such as biological fermentation, wastewater treatment, and seawater desalination. It sprays the solution to be treated onto the tube bundle, so that the solution forms a water film on the outer surface of the tube bundle and exchanges heat with the heat medium flowing in the tube, thereby evaporating the water in the solution to achieve the effect of concentrating the solution. In the process of using the existing horizontal tube falling film evaporator, sediment often adheres to the surface of the tube bundle. If it is not cleaned in time, it will affect the heat exchange of the evaporator. Therefore, it is necessary to manually use a high-pressure water gun to wash the tube bundle from the observation window. The cleaning area of this cleaning method is limited, many places of the tube bundle cannot be washed, the cleaning effect of the tube bundle is poor, and it is very labor-consuming.

[0003] Therefore, we design a horizontal tube falling film evaporator here. Content of the Utility Model

[0004] The purpose of the utility model is to provide a horizontal tube falling film evaporator aiming at the deficiencies of the prior art to solve the problems put forward in the background art.

[0005] To achieve the above purpose, the utility model provides the following technical scheme: A horizontal tube falling film evaporator, including a cylindrical shell, two circular partitions are installed inside the cylindrical shell, a tube bundle is installed between the two circular partitions, two screw rods are rotatably installed inside the cylindrical shell through bearing seats, both screw rods are located between the two circular partitions and are symmetric about the central axis of the cylindrical shell, thread cylinders are arranged on both screw rods, an annular tube is sleeved outside the tube bundle, the annular tube and the two thread cylinders are fixed through fixing parts, and a circle of high-pressure nozzles is installed inside the annular tube;

[0006] The right main shafts of the two screw rods pass through the right circular partition and the right side wall of the cylindrical shell and are installed with sprockets, and the two sprockets are connected by a chain drive. A protective shell is installed on the right side of the cylindrical shell, the protective shell covers the sprockets and the chain, and a motor is installed on the protective shell, and the output shaft of the motor is connected to the right main shaft of one of the screw rods;

[0007] A connecting pipe communicating with the outside is installed on the inner side wall of the cylindrical shell. The connecting pipe is located between two circular partitions. The port of the connecting pipe inside the cylindrical shell is communicated with the annular pipe through a flexible hose. A round hole is opened at the middle position of the bottom of the cylindrical shell, and a liquid storage tank is installed. A liquid filling port is arranged at the top side of the liquid storage tank, and a liquid discharge port and a reflux port are arranged at the bottom of the liquid storage tank. A water pump is installed on the outside of the cylindrical shell. The water inlet end of the water pump is connected to the reflux port through a pipeline, and the water outlet end of the water pump is connected to the port of the connecting pipe outside the cylindrical shell through a pipeline.

[0008] Preferably, a spray pipe is installed at the top of the inner cavity of the cylindrical shell. The spray pipe is located between two circular partitions. The liquid inlet of the spray pipe is arranged outside the cylindrical shell, and a plurality of uniformly distributed spray nozzles are installed at the bottom of the spray pipe.

[0009] Preferably, a heat medium inlet is arranged on the right side of the cylindrical shell, and a heat medium outlet is arranged on the left side of the cylindrical shell.

[0010] Preferably, circular through holes corresponding to all the pipelines of the tube bundle are arranged on both of the two circular partitions.

[0011] Preferably, electromagnetic valves are installed on the liquid filling port, the liquid discharge port and the reflux port of the liquid storage tank.

[0012] Compared with the prior art, the present utility model provides a horizontal tube falling film evaporator, which has the following beneficial effects:

[0013] In this horizontal tube falling film evaporator, by setting a motor to drive a screw rod to rotate, and then through the cooperation of the screw rod and the threaded cylinder, the threaded cylinder can be controlled to drive the annular pipe to move back and forth on the tube bundle. By installing a high-pressure nozzle inside the annular pipe and pumping a cleaning agent or water into the annular pipe, the tube bundle can be rinsed comprehensively. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a front structural schematic diagram of the present utility model;

[0015] Figure 2 is a back structural schematic diagram of the present utility model;

[0016] Figure 3 is a structural schematic diagram of the annular pipe driving structure of the present utility model;

[0017] Figure 4 is a side sectional view of the cylindrical shell of the present utility model;

[0018] Figure 5 is a front sectional view of the cylindrical shell of the present utility model.

[0019] Reference numerals: 1, cylindrical shell; 1-1, heat medium inlet; 1-2, heat medium outlet; 2, circular partition; 3, tube bundle; 4, screw; 5, threaded cylinder; 6, annular pipe; 7, fixing member; 8, high-pressure nozzle; 9, chain; 10, protective shell; 11, motor; 12, connecting pipe; 13, hose; 14, liquid storage tank; 14-1, liquid filling port; 14-2, liquid discharge port; 14-3, return port; 15, water pump; 16, spray pipe; 16-1, liquid inlet; 17, spray nozzle. Detailed implementation mode

[0020] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0021] Please refer to Figures 1 - 5 , in this embodiment: A horizontal tube falling film evaporator includes a cylindrical shell 1. A heat medium inlet 1-1 is provided on the right side of the cylindrical shell 1, and a heat medium outlet 1-2 is provided on the left side of the cylindrical shell 1. Two circular partitions 2 are installed inside the cylindrical shell 1. A tube bundle 3 is installed between the two circular partitions 2. Circular through holes corresponding to all the pipes of the tube bundle 3 are provided on both of the two circular partitions 2. An opening is provided at the top of the cylindrical shell 1 for discharging steam. An observation window can be provided on the side of the cylindrical shell 1. When the evaporator works, the heat medium can be introduced into the inside of the cylindrical shell 1 from the heat medium inlet 1-1, then pass through the pipes of the tube bundle 3, and finally be discharged from the heat medium outlet 1-2.

[0022] Two screws 4 are rotatably installed inside the cylindrical shell 1 through bearing seats. Both of the two screws 4 are located between the two circular partitions 2 and are symmetric about the central axis of the cylindrical shell 1. Threaded cylinders 5 are provided on both of the two screws 4. An annular pipe 6 is sleeved outside the tube bundle 3. The annular pipe 6 and the two threaded cylinders 5 are fixed by fixing members 7. A circle of high-pressure nozzles 8 is installed inside the annular pipe 6. When the two screws 4 rotate, the annular pipe 6 can be driven to move left and right between the two circular partitions 2 through the cooperation of the screws 4 and the threaded cylinders 5. At this time, water is pumped into the annular pipe 6, and the tube bundle 3 can be flushed through the high-pressure nozzles 8.

[0023] The right ends of the main shafts of the two screws 4 pass through the right circular partition 2 and the right side wall of the cylindrical housing 1 and are equipped with sprockets, and the two sprockets are connected by a chain 9. A protective housing 10 is installed on the right side of the cylindrical housing 1. The protective housing 10 covers the sprockets and the chain 9. A motor 11 is installed on the protective housing 10. The output shaft of the motor 11 is connected to the right end main shaft of one of the screws 4. A seal is maintained between the right end main shafts of the two screws 4 and the right circular partition 2 and the right side wall of the cylindrical housing 1. When flushing the tube bundle 3, by starting the motor 11, one of the screws 4 can be directly driven to rotate, and then the other screw 4 can be driven to rotate together through chain drive. The sprockets on the two screws 4 should be the same to ensure that the rotational speeds of the two screws 4 are the same.

[0024] A connecting pipe 12 communicating with the outside is installed on the inner side wall of the cylindrical housing 1. The connecting pipe 12 is located between the two circular partitions 2. The port of the connecting pipe 12 on the inner side of the cylindrical housing 1 is communicated with the annular pipe 6 through a flexible pipe 13. A round hole is opened at the middle position of the bottom of the cylindrical housing 1 and a liquid storage tank 14 is installed. A liquid filling port 14-1 is arranged at the top side of the liquid storage tank 14. A liquid discharge port 14-2 and a reflux port 14-3 are arranged at the bottom of the liquid storage tank 14. Solenoid valves are installed on the liquid filling port 14-1, the liquid discharge port 14-2 and the reflux port 14-3. A water pump 15 is installed on the outside of the cylindrical housing 1. The water inlet end of the water pump 15 is connected to the reflux port 14-3 through a pipe, and the water outlet end of the water pump 15 is connected to the port of the connecting pipe 12 on the outside of the cylindrical housing 1. When flushing the tube bundle 3, open the liquid filling port 14-1 and the reflux port 14-3 of the liquid storage tank 14, close the liquid discharge port 14-2 of the liquid storage tank 14, add a cleaning agent or water into the liquid storage tank 14 from the liquid filling port 14-1, and then start the water pump 15, and the cleaning agent or water can be pumped into the annular pipe 6.

[0025] Please refer to Figure 4 and Figure 5 , a spray pipe 16 is installed at the top of the inner cavity of the cylindrical housing 1. The spray pipe 16 is located between the two circular partitions 2. The liquid inlet 16-1 of the spray pipe 16 is arranged outside the cylindrical housing 1. A number of uniformly distributed spray nozzles 17 are installed at the bottom of the spray pipe 16. When the evaporator works, close the liquid filling port 14-1 and the reflux port 14-3 of the liquid storage tank 14, open the liquid discharge port 14-2 of the liquid storage tank 14, pump the material to be evaporated into the spray pipe 16 from the liquid inlet 16-1, and the material can be sprinkled on the tube bundle 3 through the spray nozzles 17 to form a water film and perform heat exchange with the heat medium flowing in the tube bundle 3, so as to evaporate the moisture in the material. Finally, the material falls to the bottom of the cylindrical housing 1 under the action of gravity and is discharged through the liquid discharge port 14-2 of the liquid storage tank 14.

[0026] Working principle and usage process of the present utility model: When the horizontal tube falling film evaporator is in use, close the liquid filling port 14-1 and the reflux port 14-3 of the liquid storage tank 14, open the liquid discharge port 14-2 of the liquid storage tank 14, introduce heat medium into the pipes of the tube bundle 3, then pump the material to be evaporated into the spray pipe 16, and sprinkle the material on the tube bundle 3 through the spray nozzles 17 to form a water film, and conduct heat exchange with the heat medium flowing in the tube bundle 3, thereby evaporating the water in the material. The evaporated material finally discharges from the liquid discharge port 14-2. When flushing the tube bundle 3, open the liquid filling port 14-1 and the reflux port 14-3 of the liquid storage tank 14, close the liquid discharge port 14-2 of the liquid storage tank 14, add cleaning agent or water into the liquid storage tank 14, then start the water pump 15, pump the cleaning agent or water into the annular pipe 6, and then start the motor 11, control the translation of the annular pipe 6 by driving the screw rod 4 to rotate, and spray the cleaning agent or water through the high-pressure nozzles 8, thereby flushing the tube bundle 3 comprehensively.

[0027] Finally, it should be noted that the above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A horizontal tube falling film evaporator, comprising a cylindrical shell (1), characterized in that: Two circular baffles (2) are installed inside the cylindrical shell (1), a tube bundle (3) is installed between the two circular baffles (2), two screw rods (4) are rotatably installed on the inner side of the cylindrical shell (1) through a bearing seat, the two screw rods (4) are both located between the two circular baffles (2) and are symmetrical about the central axis of the cylindrical shell (1), a threaded tube (5) is provided on the two screw rods (4), an annular tube (6) is sleeved on the outer periphery of the tube bundle (3), the annular tube (6) and the two threaded tubes (5) are fixed by a fixing piece (7), and a circle of high-pressure nozzles (8) is installed on the inner side of the annular tube (6); The right end spindles of the two screw rods (4) pass through the right circular partition plate (2) and the right side wall of the cylindrical shell (1) and are equipped with sprockets, and the two sprockets are connected by a chain (9). A protective shell (10) is installed on the right side of the cylindrical shell (1), and the protective shell (10) covers the sprocket and the chain (9). A motor (11) is installed on the protective shell (10), and the output shaft of the motor (11) is connected to the right end spindle of one of the screw rods (4); A connecting pipe (12) communicating with the outside is installed on the inner wall of the cylindrical shell (1), the connecting pipe (12) is located between the two circular partitions (2), a port on the connecting pipe (12) located on the inner side of the cylindrical shell (1) is connected to the annular pipe (6) through a hose (13), a circular hole is opened in the middle of the bottom of the cylindrical shell (1) and a liquid storage tank (14) is installed, a liquid filling port (14-1) is arranged on the top of the side of the liquid storage tank (14), a liquid discharge port (14-2) and a return port (14-3) are arranged on the bottom of the liquid storage tank (14), a water pump (15) is installed on the outer side of the cylindrical shell (1), a water inlet end of the water pump (15) is connected to the return port (14-3) through a pipeline, and a water outlet end of the water pump (15) is connected to a port on the connecting pipe (12) located on the outer side of the cylindrical shell (1) through a pipeline.

2. A horizontal tube falling film evaporator according to claim 1, characterized in that: A spray pipe (16) is installed at the top of the inner cavity of the cylindrical shell (1), the spray pipe (16) is located between the two circular partitions (2), the liquid inlet (16-1) of the spray pipe (16) is arranged outside the cylindrical shell (1), and a plurality of evenly distributed spray nozzles (17) are installed at the bottom of the spray pipe (16).

3. The horizontal tube falling film evaporator according to claim 1, characterized in that: A heat medium inlet (1-1) is arranged on the right side of the cylindrical shell (1), and a heat medium outlet (1-2) is arranged on the left side of the cylindrical shell (1).

4. The horizontal tube falling film evaporator according to claim 1, characterized in that: The two circular partitions (2) are both provided with circular through holes corresponding one to one to all the pipes of the pipe bundle (3).

5. The horizontal tube falling film evaporator according to claim 1, characterized in that: Solenoid valves are installed on the liquid adding port (14-1), the liquid discharging port (14-2) and the reflux port (14-3) of the liquid storage tank (14).

Images