A falling film evaporator with enhanced heat transfer element heat exchange tubes

Abstract

The utility model relates to a falling film evaporator with heat exchange tube of reinforced heat transfer element, including evaporating jar body, evaporating jar body one end is equipped with evaporating chamber, and evaporating chamber and evaporating jar body are equipped with the heat exchange subassembly of reinforced heat transfer in, the other end is installed with the apron, the apron one end is connected with the feed pipe, the other end is connected with the buffer component for buffering liquid through the connecting pipe body, the utility model center heat exchange pipe body big pipe diameter provides big passageway for liquid, reduces flow resistance, reduces the blockage from the source, and the small heat exchange vertical pipe surrounds the dispersed flow, and the individual blockage does not affect the whole, disperses the risk, and the surrounding structure increases the heat exchange area, promotes heat collaborative transmission, improves heat transfer efficiency, shortens the evaporation time, reduces the energy consumption.

Description

Technical Field

[0001] This utility model relates to the field of falling film evaporators, specifically a falling film evaporator with a heat exchange tube that enhances heat transfer elements. Background Technology

[0002] In related technologies, falling film evaporators are highly efficient evaporation devices used to evaporate solvents from liquids or solutions, thereby concentrating the solution or extracting the solute. The feed liquid is added from the top of the evaporator and evenly distributed into each heat exchange tube by a liquid distributor. Under the influence of gravity, vacuum induction, and airflow, the feed liquid forms a uniform thin film that flows downwards along the tube wall. During this flow, the feed liquid is heated and vaporized by steam in the shell side. The generated steam and the concentrated liquid phase enter the separation chamber of the evaporator together. In the separation chamber, the steam and liquid phase are fully separated. The steam enters the condenser for condensation (single-effect operation) or enters the next effect evaporator as a heating medium (multi-effect operation), while the concentrated liquid phase is discharged from the separation chamber. Heat transfer in the heat exchange tubes is crucial to the evaporator's efficiency. To improve heat transfer technology, existing falling film evaporators have two sieve plates on the distribution plate: a larger sieve plate corresponding to the distribution plate, and a smaller sieve plate located above the larger sieve plate at the center.

[0003] According to the published patent CN120550425A, a falling film evaporator based on heat exchange tube enhanced heat transfer technology relates to the field of evaporation equipment technology. It includes an evaporator tank, a feed pipe installed at the top of the tank, a liquid distribution plate inside the tank, a distributor above the distribution plate connected to the feed pipe, a lower liquid plate at the bottom of the distributor with several lower liquid holes, the liquid drop points of the lower liquid holes being equidistant from the adjacent heat exchange tube openings, and each lower liquid hole being equidistant from the distribution plate. A float is installed inside the distributor, and a switch plate is rotatably mounted inside the distributor with several switch holes. A transmission mechanism is located on the side of the distributor, and the float is linked to the switch plate via the transmission mechanism to control the flow between the switch holes and the lower liquid holes, achieving uniform liquid distribution. The synchronous opening and closing of each lower liquid hole also ensures uniform liquid distribution.

[0004] In traditional falling film evaporators with enhanced heat transfer elements (heat exchange tubes) during operation, multiple heat exchange tubes are installed in the evaporator tank and evaporation chamber. During heat exchange in conventional falling film evaporators, impurities or crystals formed during evaporation can easily accumulate in the relatively small and uniform diameter heat exchange tubes, gradually leading to blockage. Once blockage occurs, liquid flow is obstructed, affecting not only the heat transfer efficiency of that heat exchange tube but also causing a chain reaction that disrupts the normal operation of the entire evaporator. Therefore, a new technical solution is needed to address this issue. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the existing technology, adapt to practical needs, and provide a falling film evaporator with enhanced heat transfer elements and heat exchange tubes. This addresses the problem that in traditional falling film evaporators with enhanced heat transfer elements and heat exchange tubes, multiple heat exchange tubes are provided in the evaporator tank and evaporation chamber. In the heat exchange of traditional falling film evaporators, if impurities or crystals generated during the evaporation process are present, they tend to accumulate in the relatively small and uniform heat exchange tubes, gradually forming blockages. Once blockage occurs, the liquid flow is obstructed, which not only affects the heat transfer efficiency of the heat exchange tubes but also has a chain reaction on the normal operation of the entire evaporator.

[0006] To achieve the purpose of this utility model, the technical solution adopted by this utility model is as follows: a falling film evaporator with a heat exchange tube for enhanced heat transfer element is designed, including an evaporation tank. One end of the evaporation tank is provided with an evaporation chamber, and the evaporation chamber and the evaporation tank are provided with a heat exchange component for enhanced heat transfer. The other end is equipped with a cover plate. One end of the cover plate is connected to a feed pipe, and the other end is connected to a buffer component for buffering the liquid through a connecting pipe.

[0007] Preferably, the heat exchange assembly includes a central heat exchange tube that extends through the evaporator tank into the evaporation chamber.

[0008] Preferably, one end of a plurality of horizontal heat exchange tubes are evenly distributed around the outer periphery of the central heat exchange tube body, and the other end of the plurality of horizontal heat exchange tubes is connected to a plurality of vertical heat exchange tubes surrounding the outer periphery of the central heat exchange tube body, and the diameter of the plurality of vertical heat exchange tubes is smaller than the diameter of the central heat exchange tube body.

[0009] Preferably, the buffer assembly includes a buffer housing, which is connected to a connecting pipe on the surface of the cover plate for introducing liquid into the buffer housing.

[0010] Preferably, a liquid-distributing arc-shaped block is installed inside the buffer shell, and multiple liquid-distributing plates are evenly distributed on the surface of the liquid-distributing arc-shaped block. The area between the multiple liquid-distributing plates is provided with a first through hole corresponding to and communicating with the heat exchange vertical pipe.

[0011] Preferably, the top of the liquid separating arc block is provided with a second through hole, which communicates with a third through hole opened at the bottom of the buffer shell, and the diameter of the second through hole is smaller than the diameter of the third through hole. The third through hole communicates with the central heat exchange tube located inside the evaporator.

[0012] Preferably, the bottom of the evaporation chamber is provided with a separation chamber, the bottom of which is connected to one end of a tube, and the other end of the tube is fitted with a tube cap.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] 1. This utility model combines a large central heat exchange tube with small heat exchange vertical tubes. The larger diameter of the central heat exchange tube provides a larger flow channel for the liquid, making it less likely for impurities, crystals, and other substances in the liquid to accumulate and clog. At the same time, the larger diameter reduces the resistance to liquid flow, allowing the liquid to pass through more smoothly and reducing the possibility of blockage at the source. Meanwhile, multiple small heat exchange vertical tubes surround the outside of the central heat exchange tube and are connected to the heat exchange horizontal tube, dispersing the liquid flow into multiple smaller channels. Even if some heat exchange vertical tubes become blocked due to impurities or other reasons, the liquid can still continue to flow through other unblocked heat exchange vertical tubes and the central heat exchange tube. The decentralized arrangement effectively disperses the risk of blockage and avoids the interruption of liquid flow in the entire evaporator due to local blockage. Moreover, the above-mentioned surrounding structure increases the heat exchange area and allows heat to be transferred more effectively between different heat exchange tubes, forming a synergistic heat transfer effect, which greatly improves heat transfer efficiency, shortens evaporation time, and reduces energy consumption.

[0015] 2. This utility model utilizes a buffer assembly. Liquid first enters the buffer shell, where multiple distribution plates are evenly distributed on the surface of the distribution arc-shaped block inside the buffer shell. The areas between these distribution plates have first through holes corresponding to the heat exchange vertical pipes. Within the buffer shell, the liquid, through the action of the distribution arc-shaped block and the distribution plates, is more evenly distributed into each heat exchange vertical pipe, thus flowing uniformly into the central heat exchange tube and other heat exchange tubes. This effectively solves the problem of uneven liquid distribution in traditional structures, improving heat transfer and evaporation efficiency. Simultaneously, after entering the buffer shell through the connecting pipe, the liquid impacts the distribution arc-shaped block before flowing down its surface. This buffering and stabilizing of pressure and velocity reduces impact on the heat exchange tubes, extends their service life, and maintains a relatively stable liquid flow rate into the heat exchange tubes. This ensures stable internal pressure and liquid distribution within the evaporator, improving the evaporation effect. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the heat exchange component structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the buffer component structure of this utility model;

[0018] Figure 3 This is a schematic diagram of the third through hole structure of this utility model;

[0019] Figure 4 This is a schematic diagram of the overall structure of this utility model;

[0020] In the diagram: 1. Evaporation chamber; 101. Separation chamber; 2. Evaporation tank body; 201. Central heat exchange tube body; 202. Heat exchange horizontal tube; 203. Heat exchange vertical tube; 204. Buffer shell; 205. Connecting tube body; 206. Cover plate; 207. Feed pipe; 3. Liquid distribution arc block; 301. Liquid distribution plate body; 302. First through hole; 303. Second through hole; 304. Third through hole. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0022] Example 1: A falling film evaporator with enhanced heat transfer elements (heat exchange tubes), see [link to example]. Figures 1 to 4 It includes an evaporator tank 2, one end of which is provided with an evaporation chamber 1, and the evaporation chamber 1 and the evaporator tank 2 are provided with heat exchange components to enhance heat transfer. The other end is equipped with a cover plate 206, one end of which is connected to a feed pipe 207, and the other end is connected to a buffer component for buffering the liquid through a connecting pipe 205.

[0023] When the falling film evaporator with enhanced heat transfer elements and heat exchange tubes is in operation, the liquid enters from the feed pipe 207 connected to one end of the cover plate 206, and then flows into the buffer housing 204 of the buffer assembly through the connecting pipe body 205.

[0024] For details, see Figure 1 The heat exchange assembly includes a central heat exchange tube body 201, which extends through the evaporator tank 2 into the evaporation chamber 1. Multiple horizontal heat exchange tubes 202 are evenly distributed at one end on the outer periphery of the central heat exchange tube body 201. The other end of the multiple horizontal heat exchange tubes 202 is connected to multiple vertical heat exchange tubes 203 surrounding the outside of the central heat exchange tube body 201. The diameter of the multiple vertical heat exchange tubes 203 is smaller than the diameter of the central heat exchange tube body 201.

[0025] The liquid flowing into the heat exchange vertical tubes 203 and the central heat exchange tube body 201 flows from top to bottom inside the tubes. Due to the larger diameter of the central heat exchange tube body 201, a larger flow channel is provided for the liquid, making it less likely for impurities, crystals, and other substances in the liquid to accumulate and clog, and reducing the liquid flow resistance, allowing the liquid to pass through more smoothly. Multiple small heat exchange vertical tubes 203 surround the outside of the central heat exchange tube body 201 and are connected to the heat exchange horizontal tubes 202, dispersing the liquid flow into multiple smaller channels. Even if some heat exchange vertical tubes 203 become clogged due to impurities or other reasons, the liquid can still continue to flow through other unblocked heat exchange vertical tubes 203 and the central heat exchange tube body 201, effectively dispersing the risk of blockage and avoiding the interruption of liquid flow in the entire evaporator due to local blockage. Moreover, this surrounding structure increases the heat exchange area, allowing heat to be transferred more effectively between different heat exchange tube bodies, forming a synergistic heat transfer effect and improving heat transfer efficiency.

[0026] It is worth noting that, see Figure 2 and Figure 3 The buffer assembly includes a buffer housing 204, which is connected to a connecting pipe 205 on the surface of a cover plate 206 for introducing liquid into the buffer housing 204. A liquid-distributing arc block 3 is installed inside the buffer housing 204. Multiple liquid-distributing plates 301 are evenly distributed on the surface of the liquid-distributing arc block 3. A first through hole 302 corresponding to and connected to the heat exchange vertical pipe 203 is provided in the area between the multiple liquid-distributing plates 301. A second through hole 303 is provided at the top of the liquid-distributing arc block 3. The second through hole 303 is connected to a third through hole 304 at the bottom of the buffer housing 204. The diameter of the second through hole 303 is smaller than the diameter of the third through hole 304. The third through hole 304 is connected to the central heat exchange pipe 201 located in the evaporator tank 2.

[0027] In the buffer shell 204, the liquid impacts the liquid distribution arc block 3, and the pressure and velocity are buffered and stabilized. Multiple liquid distribution plates 301 evenly distributed on the surface of the liquid distribution arc block 3 distribute the liquid evenly to the area between the multiple liquid distribution plates 301. Multiple areas are provided with first through holes 302 corresponding to the heat exchange vertical pipes 203. The liquid flows evenly into the multiple heat exchange vertical pipes 203 surrounding the central heat exchange tube body 201 through the first through holes 302. At the same time, the second through hole 303 at the top of the liquid distribution arc block 3 is connected to the third through hole 304 at the bottom of the buffer shell 204, and the diameter of the second through hole 303 is smaller than the diameter of the third through hole 304, which prevents a large amount of liquid from entering through the second through hole 303. The third through hole 304 is connected to the central heat exchange tube body 201 located in the evaporator tank 2, and some liquid flows into the central heat exchange tube body 201 through the second through hole 303 and the third through hole 304.

[0028] It is worth mentioning that, see Figure 1 The bottom of the evaporation chamber 1 is provided with a separation chamber 101, and the bottom of the separation chamber 101 is connected to one end of the tube body, and the other end of the tube body is equipped with a tube cover.

[0029] During the liquid flow process, the steam heats and vaporizes the liquid in the heat exchange tube. The generated steam and the concentrated liquid phase enter the evaporation chamber 1 at one end of the evaporator. In the separation chamber 101 of the evaporation chamber 1, the steam and liquid phase are fully separated. The steam enters the condenser for condensation or enters the next effect evaporator as a heating medium, while the concentrated liquid phase is discharged from the pipe body connected to the bottom of the separation chamber 101. A pipe cover is installed at the other end of the pipe body to control the discharge of the concentrated liquid phase.

[0030] In addition, all components designed in this utility model are general standard parts or components known to those skilled in the art. Their structure and principle can be known to those skilled in the art through technical manuals or conventional experimental methods. Those skilled in the art can fully implement them, so there is no need to elaborate. The content protected by this utility model does not involve improvements to the internal structure and method.

Claims

1. A falling film evaporator with enhanced heat transfer elements (heat exchange tubes), comprising an evaporator tank (2), characterized in that, The evaporator (2) has an evaporation chamber (1) at one end, and heat exchange components for enhanced heat transfer are provided in the evaporation chamber (1) and the evaporator (2). A cover plate (206) is installed at the other end. A feed pipe (207) is connected to one end of the cover plate (206), and a buffer component for buffering the liquid is connected to the other end through a connecting pipe (205).

2. The falling film evaporator with enhanced heat transfer elements and heat exchange tubes as described in claim 1, characterized in that, The heat exchange assembly includes a central heat exchange tube (201) that extends through the evaporator tank (2) into the evaporation chamber (1).

3. The falling film evaporator with enhanced heat transfer elements and heat exchange tubes as described in claim 2, characterized in that, The central heat exchange tube body (201) has a plurality of heat exchange horizontal tubes (202) evenly distributed at one end on its outer periphery. The other end of the plurality of heat exchange horizontal tubes (202) is connected to a plurality of heat exchange vertical tubes (203) surrounding the central heat exchange tube body (201). The diameter of the plurality of heat exchange vertical tubes (203) is smaller than the diameter of the central heat exchange tube body (201).

4. The falling film evaporator with enhanced heat transfer elements and heat exchange tubes as described in claim 1, characterized in that, The buffer assembly includes a buffer housing (204), which is connected to a connecting pipe (205) on the surface of the cover plate (206) for introducing liquid into the buffer housing (204).

5. The falling film evaporator with enhanced heat transfer elements and heat exchange tubes as described in claim 4, characterized in that, The buffer housing (204) is equipped with a liquid-distributing arc block (3), and multiple liquid-distributing plates (301) are evenly distributed on the surface of the liquid-distributing arc block (3). The area between the multiple liquid-distributing plates (301) is provided with a first through hole (302) corresponding to the heat exchange vertical pipe (203).

6. The falling film evaporator with enhanced heat transfer elements and heat exchange tubes as described in claim 5, characterized in that, The liquid separating arc block (3) has a second through hole (303) at the top. The second through hole (303) is connected to the third through hole (304) at the bottom of the buffer shell (204). The diameter of the second through hole (303) is smaller than the diameter of the third through hole (304). The third through hole (304) is connected to the central heat exchange tube (201) located in the evaporator (2).

7. The falling film evaporator with enhanced heat transfer elements and heat exchange tubes as described in claim 1, characterized in that, The bottom of the evaporation chamber (1) is provided with a separation chamber (101), and the bottom of the separation chamber (101) is connected to one end of the tube body, and the other end of the tube body is equipped with a tube cover.

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