A falling film evaporator based on heat transfer enhancement technology of heat exchange tubes

Abstract

The present invention provides a falling film evaporator based on the heat exchange tube enhanced heat transfer technology, which relates to the technical field of evaporation equipment, including an evaporation tank body, a feed pipe installed on the top of the evaporation tank body, a liquid separation plate provided inside the evaporation tank body, a liquid separator provided above the liquid separation plate, the liquid separator is connected to the feed pipe, a lower liquid plate is provided at the bottom of the liquid separator, a plurality of lower liquid holes are provided on the lower liquid plate, the liquid falling points of the lower liquid holes are arranged at equal intervals with the pipe openings of the adjacent heat exchange tubes, and the distance between each lower liquid hole and the liquid separation plate is the same, a float is provided in the liquid separator, a switch plate is rotatably installed in the liquid separator, a plurality of switch holes are opened on the switch plate, and a transmission mechanism is provided on the side of the liquid separator, the float is linked with the switch plate through the transmission mechanism, controls the flow resistance of the switch holes and the lower liquid holes, realizes uniform distribution of liquid and material, controls the synchronous opening and closing of the lower liquid holes, and realizes uniform distribution of liquid and material. This scheme realizes uniform distribution of liquid and material, so that the film forming conditions in the heat exchange tubes at different positions are as similar as possible.

Description

Technical Field

[0001] The present invention relates to the technical field of evaporation equipment, and in particular to a falling film evaporator based on a heat exchange tube enhanced heat transfer technology. Background Art

[0002] In the related art, a falling film evaporator is a highly efficient evaporation device used to evaporate the solvent from a liquid or solution, thereby concentrating the solution or extracting the solute. The feed liquid is added at the top of the evaporator and evenly distributed to each heat exchange tube through a liquid distributor. Under the action of gravity, vacuum induction, and airflow, the feed liquid forms a uniform thin film and flows from top to bottom along the tube wall. During the flow process, the feed liquid is heated and vaporized by the steam in the shell side, and the generated steam and the concentrated liquid phase enter the separation chamber of the evaporator together. In the separation chamber, the steam and liquid phases 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.

[0003] Heat transfer in heat exchange tubes is key to evaporator efficiency. To improve heat transfer, existing falling film evaporators employ upper and lower sieve plates on a liquid separator plate. The larger sieve plate corresponds to the separator plate, while the smaller sieve plate is positioned above the larger sieve plate and at the center. Because the evaporator feed pipe is closer to the heat exchange tube openings at the center of the separator plate than at the edges, staggering the holes in the larger and smaller sieve plates can extend the central liquid flow path, balancing the start time of liquid inflow at different tube openings and improving heat distribution across the tubes. However, this liquid separation method cannot ensure that each hole in the larger sieve plate is spaced uniformly from the tube openings. Therefore, during the startup phase of the falling film evaporator, due to uneven liquid distribution, the central heat exchange tube is prone to film formation and heating, while the edge heat exchange tubes may dry out. This uneven heating of the heat exchange tubes can easily lead to scaling, further affecting the heat transfer efficiency of the tubes. Therefore, we propose a falling film evaporator based on heat transfer enhancement technology for heat exchange tubes. Summary of the Invention

[0004] In order to solve the technical problem that the existing falling film evaporator liquid separation method cannot ensure that the distance between each hole of the large sieve plate and the tube mouth of the heat exchange tube is the same, therefore during the startup stage of the falling film evaporator, due to uneven liquid distribution, the central heat exchange tube is prone to film formation and heating, while the edge heat exchange tube may dry burn, and the uneven heating of the heat exchange tube is prone to scaling, further affecting the heat transfer efficiency of the heat exchange tube, the present invention provides a falling film evaporator based on heat exchange tube enhanced heat transfer technology.

[0005] The technical solutions provided by the embodiments of the present invention are as follows:

[0006] The embodiment of the present invention provides a falling film evaporator based on the heat exchange tube enhanced heat transfer technology, comprising: an evaporation tank body, a feed pipe installed on the top of the evaporation tank body, a liquid separation plate provided inside the evaporation tank body, a plurality of heat exchange tubes plugged into the liquid separation plate, a liquid separator provided above the liquid separation plate, a lower liquid plate provided at the bottom of the liquid separator, a plurality of lower liquid holes provided on the lower liquid plate, the liquid falling points of the lower liquid holes are arranged at equal intervals from the adjacent heat exchange tube orifices, and each of the lower liquid holes has the same spacing as the liquid separation plate, a float is provided in the liquid separator, a switch plate is rotatably installed in the liquid separator, a plurality of switch holes are opened on the switch plate, a transmission mechanism is provided on the side of the liquid separator, the float is linked to the switch plate through the transmission mechanism, and controls the flow resistance between the switch hole and the lower liquid hole.

[0007] The beneficial effects brought about by the technical solution provided by the embodiment of the present invention include at least:

[0008] In the present invention, by setting the liquid separator with a lower liquid pan at the bottom and setting the liquid falling point of the lower liquid hole to be the same as the distance between the tube mouth of the heat exchange tube below, the shape of the liquid separator is changed, so that the distance the liquid flows out of the lower liquid hole to the heat exchange tube is the same, thereby achieving a balanced distribution of the liquid, making the film forming conditions in the heat exchange tubes at different positions as similar as possible, balancing the heating of the heat exchange tubes, and improving the heat transfer effect. Moreover, by setting the switch disk and the flow disk, the liquid output is adjusted by utilizing the degree of overlap between the flow hole and the lower liquid hole, thereby controlling the thickness of the liquid film in the heat exchange tube, avoiding the increase in heat transfer resistance due to excessively thick liquid film or the dry burning phenomenon due to excessively thin liquid film, and significantly improving the heat transfer effect of the heat exchange tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0010] Figure 1 A schematic diagram of an overall three-dimensional structure provided by an embodiment of the present invention;

[0011] Figure 2 A schematic diagram of an overall exploded three-dimensional structure provided by an embodiment of the present invention;

[0012] Figure 3 The embodiment of the present invention provides Figure 2 A schematic diagram of the enlarged structure at point A;

[0013] Figure 4 A schematic diagram of the top cross-sectional structure of an evaporator provided in an embodiment of the present invention;

[0014] Figure 5 A schematic structural diagram of a transmission mechanism provided in an embodiment of the present invention when the transmission mechanism is a sliding column;

[0015] Figure 6 A schematic structural diagram of a sliding column in a first state provided by an embodiment of the present invention;

[0016] Figure 7 A schematic diagram of the second state structure of a sliding post provided by an embodiment of the present invention;

[0017] Figure 8 A schematic structural diagram of a transmission mechanism provided in an embodiment of the present invention when the transmission mechanism is a steel cable;

[0018] Figure 9 A schematic diagram of a top-down cross-sectional structure of an evaporator provided in an embodiment of the present invention;

[0019] Figure 10 The embodiment of the present invention provides Figure 9 A schematic diagram of the enlarged structure at point B;

[0020] Figure 11 A schematic diagram of a heat exchange tube orifice structure provided by an embodiment of the present invention.

[0021] Reference numerals: 10, evaporation tank; 11, feed pipe; 20, evaporation chamber; 30, separation chamber; 40, steam inlet; 50, heat exchange tube; 110, liquid separation plate; 120, liquid inlet pipe; 130, liquid separator; 140, liquid blocking ring; 150, heat insulation chamber; 160, restriction column; 210, lower liquid plate; 211, lower liquid hole; 220, switch plate; 221, switch hole; 230, flow plate; 231, flow hole; 310, float; 320, seal Box; 330, connecting rod; 340, articulated seat; 350, dial head; 360, movable plate; 410, rotating slide; 420, sliding column; 510, steel cable; 520, direction-changing guide wheel; 610, handle block; 620, arc-shaped handle; 621, clamping block; 622, spring; 630, arc-shaped sleeve; 640, sliding block; 710, power storage block; 720, blocking block; 730, compression spring; 810, rack; 820, worm gear; 830, motor.

[0022] As shown in the figure, in order to clearly implement the structure of the embodiment of the present invention, specific structures and devices are marked in the figure, but this is only for illustrative purposes and is not intended to limit the present invention to the specific structure, device and environment. According to specific needs, ordinary technicians in this field can adjust or modify these devices and environments. DETAILED DESCRIPTION

[0023] The technical solutions of the present invention are described below with reference to the accompanying drawings. It is also noted that, to provide a more detailed description, the following embodiments are best and preferred embodiments, and those skilled in the art may employ alternative implementations for certain known technologies. Furthermore, the accompanying drawings are intended only to provide a more detailed description of the embodiments and are not intended to limit the present invention.

[0024] like Figures 1 to 11 As shown, the embodiment of the present invention provides a falling film evaporator based on the heat exchange tube enhanced heat transfer technology, comprising: an evaporation tank body 10, a feed pipe 11 is installed on the top of the evaporation tank body 10, a liquid separation plate 110 is provided inside the evaporation tank body 10, a plurality of heat exchange tubes 50 are plugged into the liquid separation plate 110, a liquid separator 130 is provided above the liquid separation plate 110, a lower liquid plate 210 is provided at the bottom of the liquid separator 130, and a plurality of lower liquid holes 211 are provided on the lower liquid plate 210. The liquid drop point of the heat exchange tube 11 is arranged at equal distances from the adjacent heat exchange tube 50, and each lower liquid hole 211 is spaced at the same distance from the liquid separator 110. A float 310 is provided in the liquid separator 130, and a switch plate 220 is rotatably mounted in the liquid separator 130. The switch plate 220 has a plurality of switch holes 221 formed thereon. A transmission mechanism is provided on the side of the liquid separator 130. The float 310 is linked to the switch plate 220 through the transmission mechanism to control the flow of the switch holes 221 and the lower liquid holes 211. The lower liquid holes 211 are opened and closed synchronously to achieve uniform distribution of liquid and material.

[0025] In this way, by setting the liquid separator 130 with a lower liquid pan 210 at the bottom, and setting the liquid falling point of the lower liquid hole 211 to be the same as the distance between the tube mouths of the heat exchange tube 50 below, the shape of the traditional liquid separator is changed, so that the liquid material flows out of the lower liquid hole 211 and reaches the heat exchange tube 50 along the same distance, thereby achieving a balanced distribution of the liquid material, making the film forming conditions in the heat exchange tubes 50 at different positions as similar as possible, and evenly heating the heat exchange tubes 50, thereby improving the heat transfer effect.

[0026] In addition, the evaporation tank body 10 is provided with an evaporation chamber 20, a separation chamber 30 and a steam inlet 40. The steam inlet 40 is provided at the lower end of the evaporation chamber 20, and the heat exchange tube 50 is provided as a pipe that is wide at the top and narrow at the bottom.

[0027] The beneficial effects brought about by the technical solution provided by the embodiment of the present invention include at least:

[0028] In the present invention, by setting the liquid separator with a lower liquid pan at the bottom and setting the liquid falling point of the lower liquid hole to be the same as the distance between the tube mouth of the heat exchange tube below, the shape of the liquid separator is changed, so that the distance the liquid flows out of the lower liquid hole to the heat exchange tube is the same, thereby achieving a balanced distribution of the liquid, making the film forming conditions in the heat exchange tubes at different positions as similar as possible, balancing the heating of the heat exchange tubes, and improving the heat transfer effect. Moreover, by setting the switch disk and the flow disk, the liquid output is adjusted by utilizing the degree of overlap between the flow hole and the lower liquid hole, thereby controlling the thickness of the liquid film in the heat exchange tube, avoiding the increase in heat transfer resistance due to excessively thick liquid film or the dry burning phenomenon due to excessively thin liquid film, and significantly improving the heat transfer effect of the heat exchange tube.

[0029] In one possible embodiment, a liquid inlet pipe 120 is connected between the liquid separator 130 and the feed pipe 11. A flow disk 230 is rotatably mounted above the switch disk 220. A liquid blocking ring 140 is disposed within the liquid separator 130, slidingly engaging the edge of the flow disk 230. A limiting post 160 is mounted on the liquid separator 130, correspondingly disposed to a float 310. The float 310 flexibly contacts the limiting post 160. When the float 310 contacts the limiting post 160, a critical rotation point is triggered, limiting the upward distance of the float 310 and the rotation angle of the switch disk 220.

[0030] In one possible embodiment, a sealing box 320 is installed on the inner wall of the liquid dispenser 130, and a hinged seat 340 is connected to the bottom of the sealing box 320. A connecting rod 330 is hingedly installed on the hinged seat 340, and the other end of the connecting rod 330 is connected to the float 310. A movable plate 360 ​​is slidably installed inside the sealing box 320, and a dial head 350 is fixedly installed on one end of the connecting rod 330 adjacent to the hinged seat 340. The dial head 350 is movably engaged with the movable plate 360. When the float 310 moves up and down, the movable plate 360 ​​moves.

[0031] By setting the switch disk 220, the lower liquid hole 211 and the switch hole 221 are staggered during the startup phase, so that the liquid in the liquid distributor 130 cannot flow out, and the liquid reaches the preset value, ensuring that each lower liquid hole 211 is filled with liquid, ensuring that the liquid surface pressure above all lower liquid holes 211 is balanced, and avoiding local liquid shortage. The floating of the float 310 causes the switch disk 220 to rotate, thereby achieving the overlap of the switch hole 221 and the lower liquid hole 211, and releasing the liquid uniformly.

[0032] It should be noted that the evaporation tank body 10 is of existing technology, and the evaporation chamber 20, separation chamber 30 and steam inlet 40 thereon are all of existing technology and will not be described in detail here.

[0033] In a possible embodiment, the float 310 is linked to the switch disk 220 through a transmission mechanism. Figure 4-Figure 7As shown in the figure, a heat-insulating chamber 150 is provided on the side of the liquid dispenser 130, and the movable plate 360 ​​is slidably plugged into the heat-insulating chamber 150. The transmission mechanism is provided in the heat-insulating chamber 150. The transmission mechanism includes a rotating chute 410 starting at the bottom side of the movable plate 360, and a sliding block 640 connected to the switch disk 220. A sliding column 420 is rotatably mounted on the sliding block 640, and the top end of the sliding column 420 is slidably engaged in the rotating chute 410. The rotating chute 410 is provided as a combination chute with parallel straight grooves at both ends and an oblique groove in the middle. When the sliding column 420 is located in the oblique groove in the middle of the rotating chute 410, the switch disk 220 rotates.

[0034] For example, in some embodiments, reference Figure 6 As shown, the sliding column 420 can have a first state. The first state is when the float 310 has not floated up. In the first state, the sliding column 420 is located in the parallel straight groove on the inner side of the rotating slide 410. At this time, the switch hole 221 on the switch disk 220 is staggered with the lower liquid hole 211.

[0035] For example, in some embodiments, reference Figure 7 As shown, the sliding column 420 can have a second state. In the second state, when the float 310 gradually floats up, the sliding column 420 is located in the oblique groove of the rotating slide 410. At this time, the switch hole 221 on the switch plate 220 gradually overlaps with the lower liquid hole 211.

[0036] It should be noted that the sliding column 420 can have a third state. In the third state, after the float 310 collides with the limiting column 160, in the second state, the sliding column 420 is located in a parallel straight groove on the outside of the rotating slide 410. At this time, the switch hole 221 on the switch disk 220 completely overlaps with the lower liquid hole 211.

[0037] In a possible embodiment, the float 310 is linked to the switch disk 220 through a transmission mechanism. Figure 8 As shown in the figure, a heat-insulating chamber 150 is provided on the side of the liquid dispenser 130, and the movable plate 360 ​​is slidably plugged into the heat-insulating chamber 150. The transmission mechanism is provided in the heat-insulating chamber 150. The transmission mechanism includes a sliding block 640 connected to the side of the switch disk 220 and a plurality of direction-changing guide wheels 520 rotatably installed in the heat-insulating chamber 150. A steel cable 510 is connected to the sliding block 640, and the other end of the steel cable 510 is connected to the movable plate 360 ​​through the direction-changing guide wheel 520. When the movable plate 360 ​​moves, the direction-changing guide wheel 520 pulls the sliding block 640 to move, and the switch disk 220 rotates.

[0038] In one possible implementation, reference Figures 1-11As shown in the figure, the side of the switch disk 220 is connected to a handle block 610, the handle block 610 is connected to an arc-shaped handle 620, the end of the arc-shaped handle 620 is slidably sleeved with an arc-shaped sleeve 630, a spring 622 is clamped and connected between the arc-shaped handle 620 and the arc-shaped sleeve 630, and the sliding block 640 is fixedly installed on the end of the arc-shaped sleeve 630.

[0039] In a possible embodiment, a clamping block 621 is integrally connected to the arc-shaped handle 620, a spring 622 is sleeved on the arc-shaped handle 620, and both ends of the spring 622 are respectively connected to the clamping block 621 and the inner wall of the arc-shaped sleeve 630, and the arc-shaped handle 620 and the arc-shaped sleeve 630 are both coaxially arranged with the switch disk 220.

[0040] In one possible embodiment, a force storage block 710 is fixedly installed on the side of the switch disk 220, a blocking block 720 is slidably inserted into the inner wall of the liquid distributor 130, and a compression spring 730 for resetting is installed between the blocking block 720 and the liquid distributor 130, and the blocking block 720 is configured as a ramp block.

[0041] When the sliding block 640 moves, the arc sleeve 630 slides along the arc handle 620, and at the same time the spring 622 is compressed by force, thereby absorbing the stroke. At this time, the force storage block 710 conflicts with the blocking block 720 until the spring 622 is compressed to the extreme, and the force storage block 710 breaks through the blocking block 720, thereby releasing the stroke in an instant, and converting the slow upward movement of the float 310 into a rapid rotation of the switch disk 220, so that the lower liquid hole 211 and the switch hole 221 quickly overlap, which not only allows the liquid to flow out uniformly, but also ensures that the liquid flows out in time, and quickly forms a film in the heat exchange tube 50 without dry burning, further improving the heat transfer effect of the heat exchange tube.

[0042] Initially, the inclined surface of the blocking block 720 is away from the force storage block 710. The force storage block 710 is configured as a resilient, rounded block, which can be made of high-temperature-resistant rubber or a tough metal block. Initially, the force storage block 710 needs to accumulate force to break through the blocking block 720. During reset, the inclined surface of the blocking block 720 is closer to the force storage block 710, directly squeezing the blocking block 720 and compressing the compression spring 730, forcing the force storage block 710 to directly break through the blocking block 720.

[0043] In one possible embodiment, in order to achieve control of the thickness of the liquid film, a number of flow holes 231 are opened on the flow disk 230. Initially, the flow hole 231 partially overlaps with the lower liquid hole 211. A rack 810 is provided on the edge of the flow disk 230, and a worm gear 820 is provided on the side of the liquid separator 130. The worm wheel of the worm gear 820 is engaged with the rack 810. A motor 830 is installed on the outside of the liquid separator 130, and the motor 830 is connected to the worm of the worm gear 820.

[0044] Next, the present invention will introduce the flow hole 231, the switch hole 221 and the lower liquid hole 211 in detail in combination with the above specific embodiments. Figure 11 As shown in , initially, the flow hole 231 partially overlaps with the lower liquid hole 211 , the switch hole 221 does not overlap with the lower liquid hole 211 at all, and the switch hole 221 and the flow hole 231 are located on both sides of the lower liquid hole 211 .

[0045] An existing liquid level sensor can be set in the separation chamber 30. If the amount of liquid outflow in the separation chamber 30 increases, it may be that the liquid film in the heat exchange tube 50 is too thick, resulting in large heat transfer resistance. Therefore, the control motor 830 drives the flow disk 230 to rotate, thereby adjusting the overlap between the flow hole 231 and the lower liquid hole 211, and dynamically adjusting the liquid entering the heat exchange tube 50 to ensure the heat transfer effect of the heat exchange tube 50 of the falling film evaporator of the present invention and increase reliability.

[0046] Through the above technical solution, when the falling film evaporator based on the heat exchange tube enhanced heat transfer technology provided by the present invention is in use, through the setting of the switch disk 220 and the flow disk 230, the lower liquid hole 211 and the switch hole 221 are staggered during the startup stage, so that the liquid in the liquid separator 130 cannot flow out, and the liquid reaches the preset value, ensuring that each lower liquid hole 211 is filled with liquid, ensuring that the liquid surface pressure above all lower liquid holes 211 is balanced, avoiding local liquid air phenomenon, and the floating of the float 310 prompts the switch disk 220 to rotate, thereby achieving the overlap of the switch hole 221 and the lower liquid hole 211, and releasing the liquid uniformly and quickly, and then adjusting the liquid output by the degree of overlap between the flow hole 231 and the lower liquid hole 211, thereby controlling the thickness of the liquid film in the heat exchange tube 50, avoiding the increase in heat transfer resistance caused by too thick a liquid film or the dry burning phenomenon caused by too thin a liquid film, and significantly improving the heat transfer effect of the heat exchange tube 50.

[0047] The present invention encompasses any alternatives, modifications, equivalents, and solutions that fall within the spirit and scope of the present invention. While specific details are described in detail in the preferred embodiments to provide a thorough understanding of the present invention, those skilled in the art will be able to fully understand the present invention without these details. Furthermore, to avoid unnecessary confusion regarding the essence of the present invention, well-known methods, processes, procedures, components, and circuits have not been described in detail.

[0048] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A falling film evaporator based on heat exchange tube enhanced heat transfer technology, characterized in that: include: An evaporation tank body (10), wherein a feed pipe (11) is installed on the top of the evaporation tank body (10), a liquid separation plate (110) is provided inside the evaporation tank body (10), a plurality of heat exchange tubes (50) are plugged into the liquid separation plate (110), a liquid separator (130) is provided above the liquid separation plate (110), a lower liquid plate (210) is provided at the bottom of the liquid separator (130), and a plurality of lower liquid holes (211) are provided on the lower liquid plate (210). The liquid drop point of the lower liquid hole (211) is arranged at an equal distance from the adjacent heat exchange tube (50) opening, and each lower liquid hole (211) is at the same distance from the liquid separation plate (110). A float (310) is provided in the liquid separator (130). A switch plate (220) is rotatably installed in the liquid separator (130). A plurality of switch holes (221) are provided on the switch plate (220). The side of the liquid separator (130) is provided with A transmission mechanism is provided, and the float (310) is linked to the switch disk (220) through the transmission mechanism to control the flow resistance of the switch hole (221) and the lower liquid hole (211); a liquid inlet pipe (120) is connected between the liquid distributor (130) and the feed pipe (11); a flow disk (230) is rotatably installed above the switch disk (220), and a plurality of flow holes (231) are opened on the flow disk (230). Initially, The flow hole (231) partially overlaps with the lower liquid hole (211), a rack (810) is provided on the edge of the flow disk (230), a worm gear (820) is provided on the side of the liquid distributor (130), the worm wheel of the worm gear (820) is meshed with the rack (810), and a motor (830) is installed on the outside of the liquid distributor (130), and the motor (830) is connected to the worm of the worm gear (820).

2. The falling film evaporator based on heat exchange tube enhanced heat transfer technology according to claim 1, characterized in that: A liquid blocking ring (140) is provided inside the liquid separator (130), and the liquid blocking ring (140) is slidably fitted with the edge of the flow disk (230). A limiting column (160) is installed on the liquid separator (130), and the limiting column (160) is correspondingly provided with the float (310), and the float (310) and the limiting column (160) are in active contact.

3. The falling film evaporator based on heat exchange tube enhanced heat transfer technology according to claim 1, characterized in that: A sealing box (320) is installed on the inner wall of the liquid dispenser (130), and a hinge seat (340) is connected to the bottom of the sealing box (320). A connecting rod (330) is hingedly installed on the hinge seat (340), and the other end of the connecting rod (330) is connected to the float (310). A movable plate (360) is slidably installed inside the sealing box (320), and a dial head (350) is fixedly installed at one end of the connecting rod (330) adjacent to the hinge seat (340). The dial head (350) is movably engaged with the movable plate (360), and when the float (310) moves up and down, the movable plate (360) moves.

4. The falling film evaporator based on heat exchange tube enhanced heat transfer technology according to claim 3, characterized in that: The side of the liquid dispenser (130) is provided with an insulating chamber (150), the movable plate (360) is slidably plugged into the insulating chamber (150), and the transmission mechanism is provided in the insulating chamber (150), and the transmission mechanism includes a rotating slide groove (410) starting from the bottom side of the movable plate (360), and a sliding block (640) connected to the switch disk (220), a sliding column (420) is rotatably mounted on the sliding block (640), and the top end of the sliding column (420) is slidably engaged in the rotating slide groove (410), and the rotating slide groove (410) is provided as a combined slide groove with parallel straight grooves at both ends and an oblique groove in the middle. When the sliding column (420) is located in the oblique groove in the middle of the rotating slide groove (410), the switch disk (220) rotates.

5. The falling film evaporator based on heat exchange tube enhanced heat transfer technology according to claim 3, characterized in that: A heat-insulating chamber (150) is provided on the side of the liquid dispenser (130), the movable plate (360) is slidably plugged into the heat-insulating chamber (150), and the transmission mechanism is provided in the heat-insulating chamber (150). The transmission mechanism includes a sliding block (640) connected to the side of the switch disk (220) and a plurality of direction-changing guide wheels (520) rotatably installed in the heat-insulating chamber (150). A steel cable (510) is connected to the sliding block (640), and the other end of the steel cable (510) is connected to the movable plate (360) through the direction-changing guide wheel (520). When the movable plate (360) moves, the direction-changing guide wheel (520) pulls the sliding block (640) to move, and the switch disk (220) rotates.

6. The falling film evaporator based on heat exchange tube enhanced heat transfer technology according to claim 5, characterized in that: The switch disk (220) is connected to a handle block (610) on its side, the handle block (610) is connected to an arc-shaped handle (620), an arc-shaped sleeve (630) is slidably sleeved on the end of the arc-shaped handle (620), a spring (622) is engaged and connected between the arc-shaped handle (620) and the arc-shaped sleeve (630), and the sliding block (640) is fixedly mounted on the end of the arc-shaped sleeve (630).

7. The falling film evaporator based on heat exchange tube enhanced heat transfer technology according to claim 6, characterized in that: A clamping block (621) is integrally connected to the arc-shaped handle (620), the spring (622) is sleeved on the arc-shaped handle (620), and both ends of the spring (622) are respectively connected to the clamping block (621) and the inner wall of the arc-shaped sleeve (630), and the arc-shaped handle (620) and the arc-shaped sleeve (630) are both coaxially arranged with the switch disk (220).

8. The falling film evaporator based on heat exchange tube enhanced heat transfer technology according to claim 6, characterized in that: A force storage block (710) is fixedly mounted on the side of the switch plate (220), a blocking block (720) is slidably inserted into the inner wall of the liquid distributor (130), a compression spring (730) for resetting is mounted between the blocking block (720) and the liquid distributor (130), and the blocking block (720) is configured as a ramp block.

9. The falling film evaporator based on heat exchange tube enhanced heat transfer technology according to claim 1, characterized in that: The evaporation tank body (10) is provided with an evaporation chamber (20), a separation chamber (30) and a steam inlet (40); the steam inlet (40) is provided at the lower end of the evaporation chamber (20); and the heat exchange tube (50) is provided as a pipe that is wide at the top and narrow at the bottom.

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