A liquid film distribution device for a falling film evaporator

Abstract

This utility model relates to the technical field of liquid film distribution devices for falling film evaporators, and in particular to a liquid film distribution device for falling film evaporators. By incorporating a flow-slowing device, the device can slow down the liquid flow rate during film distribution, preventing liquid film breakage and improving the film distribution effect. Furthermore, by incorporating an overflow film distribution device, the device can overflow when the liquid flow rate is too high, preventing the liquid from completely filling part of the heat exchange tubes and further improving the film distribution effect. The device includes an overflow film distribution device, a flow-slowing device, and multiple film distribution rings, all mounted on the overflow film distribution device. The overflow film distribution device distributes the liquid and overflows when the liquid flow rate is too high, the flow-slowing device slows down the liquid flow rate, and the film distribution rings reduce the occurrence of liquid film breakage.

Description

Technical Field

[0001] This utility model relates to the technical field of membrane distribution devices for falling film evaporators, and in particular to a liquid membrane distribution device for falling film evaporators. Background Technology

[0002] Falling film evaporators are widely used in pharmaceutical, food, chemical, and light industries. They feature high evaporation capacity, energy saving and consumption reduction, low operating costs, and the ability to ensure that materials do not change in properties during the evaporation process. The film distribution device is a major component of the falling film evaporator.

[0003] Existing falling film evaporator film distribution devices, such as the Chinese utility model patent CN212662731U (authorization announcement number: A film distribution device for a falling film evaporator), represent a class of prior art whose main structure includes a first distribution disk, a second distribution disk, a third distribution disk, and a stabilizing mechanism. The first distribution disk, the second distribution disk, and the third distribution disk work together to slow down the feed liquid and distribute the film, while the stabilizing mechanism improves the stability of the liquid film.

[0004] However, the existing technology and equipment still have the following problems when in use: the existing machines have a fast liquid flow rate when the liquid film is applied, which can easily cause the liquid film to break, resulting in poor film application effect. In addition, the existing machines lack an overflow device, which can easily cause the liquid to completely fill part of the heat exchange tube when the flow rate is too high, resulting in poor film application effect. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a liquid film distribution device for a falling film evaporator. By setting a slow-flow device, the liquid flow rate can be slowed down during film distribution to prevent liquid film breakage and improve film distribution effect. Furthermore, by setting an overflow film distribution device, overflow can be carried out when the liquid flow rate is too large to prevent the liquid from completely filling part of the heat exchange tube, thereby improving the film distribution effect.

[0006] This utility model discloses a liquid film distribution device for a falling film evaporator, including an overflow film distribution device; it also includes a flow slowing device and multiple film distribution rings, all of which are installed on the overflow film distribution device; the overflow film distribution device distributes the liquid and overflows when the liquid flow rate is too high, the flow slowing device slows down the liquid flow rate, and the film distribution rings reduce the phenomenon of liquid film breakage.

[0007] Preferably, the overflow membrane distribution device includes a membrane distribution frame, multiple heat exchange tubes, multiple membrane distribution heads, multiple supports, and a liquid inlet cover. The top of the membrane distribution frame is provided with multiple drain holes, the multiple heat exchange tubes are respectively installed at the bottom of the multiple drain holes, the multiple membrane distribution heads are respectively installed at the top of the multiple drain holes, the multiple supports are evenly spaced on the side of the membrane distribution frame, and the liquid inlet cover is installed on the multiple supports, with a liquid inlet hole at the top of the liquid inlet cover. The membrane distribution heads distribute the liquid into a membrane, and the gap between the membrane distribution frame and the liquid inlet cover overflows when the liquid flow rate is too high.

[0008] Preferably, the surfaces where the plurality of membrane heads and the support intersect are all provided with rounded corners, and the plurality of membrane heads are all made of alumina ceramic, and the plurality of membrane heads are all polished to make the surface rougher; the membrane heads made of alumina ceramic with a rough surface have good hydrophilicity, and can draw the liquid into the heat exchange tube through capillary action to form a continuous liquid film.

[0009] Preferably, the outermost edge of the top of the film frame is also provided with a baffle of the same height as the multiple film heads, and the baffle is made of polytetrafluoroethylene (PTFE). The PTFE baffle has good hydrophobicity, which can prevent the liquid from leaving the film frame during film application by means of liquid surface tension. At the same time, when there is too much liquid and it is about to submerge the film head, the liquid will break through the limitation of liquid surface tension and flow into the gap between the film frame and the liquid inlet cover through the baffle to form an overflow.

[0010] Preferably, the flow-retarding device includes multiple support brackets and a flow-retarding plate. The multiple support brackets are all installed at the top of the film-forming frame, and the flow-retarding plate is installed at the top of the multiple support brackets. The top of the support brackets is provided with a gently sloping guide slope. Multiple concentric flow-blocking rings are evenly spaced at the top of the guide slope. A toothed overflow plate is provided on the side of the flow-retarding plate. When the liquid comes into contact with the top of the flow-retarding plate, it is impacted and slowed down. Then the liquid flows along the flow-retarding plate to the top of the film-forming frame. At this time, the flow-blocking rings and toothed overflow plate of the flow-retarding plate further reduce the flow velocity of the liquid and make the liquid evenly distributed in a ring.

[0011] Preferably, the plurality of membrane rings are respectively installed on the top of the plurality of drainage holes of the membrane frame, and the surfaces of the plurality of membrane rings smoothly transition between the plurality of membrane heads and the plurality of drainage holes of the support; the shape of the membrane rings can prevent the liquid film from being obstructed and breaking.

[0012] Preferably, the surfaces of the plurality of film-forming rings are also provided with a plurality of spiral grooves; the spiral grooves can cause the liquid to spin during film formation, thereby improving the stability of the liquid film.

[0013] Compared with the prior art, the advantages of this utility model are: it can slow down the flow rate of the liquid during film application to prevent the liquid film from breaking, resulting in a better film application effect; and it can overflow when the liquid flow rate is too high to prevent the liquid from completely filling part of the heat exchange tube, resulting in a better film application effect. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the isometric structure of this utility model;

[0015] Figure 2 This is an isometric structural schematic diagram of the overflow membrane device;

[0016] Figure 3 This is a schematic diagram of the isometric structure of the flow control device;

[0017] Figure 4 This is an isometric structural diagram of the flow control device from another direction;

[0018] Figure 5 This is an isometric structural diagram of the membrane ring in Example 1;

[0019] Figure 6 This is an isometric structural diagram of the film ring in Example 2.

[0020] The attached diagram is labeled as follows: 01, overflow membrane distribution device; 11, membrane distribution frame; 12, heat exchange tube; 13, membrane distribution head; 14, support one; 15, liquid inlet cover; 02, flow slowing device; 21, support two; 22, flow slowing plate; 03, membrane distribution ring. Detailed Implementation

[0021] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. This utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of this utility model more thorough and complete. Example 1

[0022] like Figure 1 As shown, it includes an overflow membrane distribution device 01; it also includes a flow slowing device 02 and multiple membrane distribution rings 03, both of which are installed on the overflow membrane distribution device 01; the overflow membrane distribution device 01 distributes the liquid into a membrane and overflows when the liquid flow rate is too high, the flow slowing device 02 slows down the liquid flow rate, and the membrane distribution rings 03 reduce the phenomenon of liquid film breakage;

[0023] like Figure 2 As shown, the overflow membrane device 01 includes a membrane frame 11, multiple heat exchange tubes 12, multiple membrane heads 13, multiple supports 14, and a liquid inlet cover 15. The top of the membrane frame 11 is provided with multiple drain holes, the multiple heat exchange tubes 12 are respectively installed at the bottom of the multiple drain holes, the multiple membrane heads 13 are respectively installed at the top of the multiple drain holes, the multiple supports 14 are evenly spaced on the side of the membrane frame 11, and the liquid inlet cover 15 is installed on the multiple supports 14. The top of the liquid inlet cover 15 is provided with a liquid inlet hole.

[0024] like Figure 2 As shown, the surfaces where the multiple fabric heads 13 and the support 14 intersect are all provided with rounded corners, and the multiple fabric heads 13 are all made of alumina ceramic, and the multiple fabric heads 13 are all polished to make the surface rougher.

[0025] like Figure 2 As shown, the outermost edge of the top of the fabric frame 11 is also provided with a baffle that is at the same height as the multiple fabric heads 13, and the baffle is made of polytetrafluoroethylene.

[0026] like Figure 3 and Figure 4 As shown, the flow control device 02 includes multiple second supports 21 and a flow control plate 22. The multiple second supports 21 are all installed on the top of the film frame 11, and the flow control plate 22 is installed on the top of the multiple second supports 21. The top of the second supports 21 is provided with a gently sloping material guide slope. Multiple concentric flow-blocking rings are evenly spaced on the top of the material guide slope. The side end of the flow control plate 22 is provided with a toothed overflow plate.

[0027] like Figure 5 As shown, the plurality of membrane rings 03 are respectively installed on the top of the plurality of drainage holes of the membrane frame 11, and the surfaces of the plurality of membrane rings 03 smoothly transition between the plurality of membrane heads 13 and the plurality of drainage holes of the bracket 14.

[0028] First, the liquid feed is introduced into the machine through the inlet hole of the inlet cover 15. Under the action of gravity, the liquid falls and contacts the flow buffer 22. When the liquid contacts the top of the flow buffer 22, it is impacted and slowed down. Then, the liquid flows along the flow buffer 22 to the top of the membrane holder 11. At this time, the flow-blocking ring and toothed overflow plate of the flow buffer 22 further reduce the flow rate of the liquid and make the liquid evenly distributed in a ring. After that, the liquid reaches the top of the membrane holder 11 and fills the top surface of the membrane holder 11 at a uniform speed. The membrane is made of alumina ceramic and has a rough surface. The head 13 has good hydrophilicity, which can draw the liquid into the heat exchange tube 12 through capillary action to form a continuous liquid film. The shape of the membrane ring 03 can prevent the liquid film from being blocked and broken. The polytetrafluoroethylene baffle has good hydrophobicity, which can prevent the liquid from leaving the membrane frame 11 during membrane application by liquid surface tension. At the same time, when there is too much liquid and it is about to submerge the membrane head 13, the liquid breaks through the limitation of liquid surface tension and flows through the baffle into the gap between the membrane frame 11 and the liquid inlet cover 15 to form an overflow. Example 2

[0029] In addition to Example 1, it also includes:

[0030] like Figure 6 As shown, the surfaces of the plurality of fabric rings 03 are also provided with a plurality of spiral grooves;

[0031] First, the liquid feed is introduced into the machine through the inlet hole of the inlet cover 15. Under the action of gravity, the liquid falls and contacts the flow buffer 22. When the liquid contacts the top of the flow buffer 22, it is impacted and slowed down. Then, the liquid flows along the flow buffer 22 to the top of the membrane holder 11. At this time, the flow-blocking ring and toothed overflow plate of the flow buffer 22 further reduce the flow rate of the liquid and make the liquid evenly distributed in a ring. After that, the liquid reaches the top of the membrane holder 11 and fills the top surface of the membrane holder 11 at a uniform speed. The membrane head 13, made of alumina ceramic with a rough surface, has good hydrophilicity. The liquid can be drawn into the heat exchange tube 12 through capillary action to form a continuous liquid film. The shape of the film-forming ring 03 can prevent the liquid film from being blocked and broken. The spiral groove can make the liquid spin during film formation, improving the stability of the liquid film. The polytetrafluoroethylene baffle has good hydrophobicity and can prevent the liquid from leaving the film-forming frame 11 during film formation by liquid surface tension. At the same time, when there is too much liquid and it is about to submerge the film-forming head 13, the liquid breaks through the limitation of liquid surface tension and flows into the gap between the film-forming frame 11 and the liquid inlet cover 15 through the baffle to form an overflow.

[0032] like Figures 1 to 6 As shown, this utility model discloses a liquid film distribution device for a falling film evaporator. During operation, the liquid is first introduced into the machine through the inlet hole of the inlet cover 15. Under gravity, the liquid falls and contacts the flow buffer 22. Upon contact with the top of the flow buffer 22, the liquid is impacted and its speed is reduced. Subsequently, the liquid flows along the flow buffer 22 to the top of the film distribution frame 11. At this point, the flow-blocking ring and toothed overflow plate of the flow buffer 22 further reduce the liquid flow rate and ensure a uniform ring-shaped distribution of the liquid. Afterward, the liquid reaches the top of the film distribution frame 11 and uniformly fills the top surface of the frame 11, which is made of alumina ceramic and has a rough surface. The membrane head 13 has good hydrophilicity, which can draw the liquid into the heat exchange tube 12 through capillary action to form a continuous liquid film. The shape of the membrane ring 03 can prevent the liquid film from being blocked and broken. The spiral groove can make the liquid spin during film formation, improving the stability of the liquid film. The polytetrafluoroethylene baffle has good hydrophobicity, which can prevent the liquid from leaving the membrane frame 11 during film formation by liquid surface tension. At the same time, when there is too much liquid and it is about to submerge the membrane head 13, the liquid breaks through the limitation of liquid surface tension and flows through the baffle into the gap between the membrane frame 11 and the liquid inlet cover 15 to form an overflow.

[0033] The main functions achieved by this utility model are as follows: by setting the slow-flow device 02, the flow rate of the liquid can be slowed down during film formation to prevent liquid film breakage and improve the film formation effect; and by setting the overflow film formation device 01, overflow can be carried out when the liquid flow rate is too high to prevent the liquid from completely filling part of the heat exchange tube, thus improving the film formation effect. This solves the existing technical problems that the liquid flow rate is too fast during film formation, which easily causes the liquid film to break and results in poor film formation effect, and that the existing machines lack an overflow device, which easily causes the liquid to completely fill part of the heat exchange tube when the flow rate is too high, resulting in poor film formation effect.

[0034] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A falling film evaporator liquid distribution device comprising an overflow distribution device (01); characterized in that, It also includes a flow slowing device (02) and multiple membrane rings (03). The flow slowing device (02) and multiple membrane rings (03) are both installed on the overflow membrane device (01). The overflow membrane device (01) distributes the liquid into a membrane and overflows when the liquid flow rate is too high. The flow slowing device (02) slows down the liquid flow rate. The membrane rings (03) reduce the phenomenon of liquid film breakage.

2. A falling film evaporator liquid film distribution device as claimed in claim 1, wherein, The overflow membrane device (01) includes a membrane frame (11), multiple heat exchange tubes (12), multiple membrane heads (13), multiple support brackets (14), and a liquid inlet cover (15). The top of the membrane frame (11) is provided with multiple drain holes. Multiple heat exchange tubes (12) are respectively installed at the bottom of multiple drain holes. Multiple membrane heads (13) are respectively installed at the top of multiple drain holes. Multiple support brackets (14) are evenly spaced on the side of the membrane frame (11). The liquid inlet cover (15) is installed on multiple support brackets (14). The top of the liquid inlet cover (15) is provided with a liquid inlet hole.

3. The liquid film distribution device for a falling film evaporator as described in claim 2, characterized in that, The surfaces where the multiple fabric heads (13) and the support (14) intersect are all provided with rounded corners, and the multiple fabric heads (13) are all made of alumina ceramic, and the multiple fabric heads (13) are all polished to make the surface rougher.

4. A falling film evaporator liquid film distribution device as claimed in claim 2, wherein, The outermost edge of the top of the fabric frame (11) is also provided with a baffle that is at the same height as the multiple fabric heads (13), and the baffle is made of polytetrafluoroethylene.

5. A falling film evaporator liquid film distribution device as set forth in claim 2 wherein, The flow retardation device (02) includes multiple brackets (21) and a flow retardation plate (22). Multiple brackets (21) are installed on the top of the film frame (11). The flow retardation plate (22) is installed on the top of multiple brackets (21). The top of the brackets (21) is provided with a gently sloping guide slope. Multiple concentric flow-blocking rings are evenly spaced on the top of the guide slope. The side end of the flow retardation plate (22) is provided with a toothed overflow plate.

6. A falling film evaporator liquid film distribution device as claimed in claim 2, wherein, The plurality of membrane rings (03) are respectively installed on the top of the plurality of drainage holes of the membrane frame (11), and the surfaces of the plurality of membrane rings (03) are smoothly transitioned between the plurality of membrane heads (13) and the plurality of drainage holes of the support (14).

7. A falling film evaporator liquid film distribution device as claimed in claim 6, wherein, The surfaces of the multiple fabric rings (03) are also provided with multiple spiral grooves.

Images