A vertical tube falling film evaporation device for preventing splashing

Abstract

The present invention relates to the field of evaporation and concentration equipment, in particular to a vertical tube falling film evaporation equipment for preventing splashing, which comprises an evaporation tank. An evaporation tube is vertically arranged in the evaporation tank. A reflux tube is sleeved inside the evaporation tube, and a waste liquid tube is sleeved inside the reflux tube. The top end of the evaporation tube is connected with a rectifying hood. The top end of the rectifying hood is open, and the rectifying hood is wider at the bottom and narrower at the top. The peripheral wall of the rectifying hood is arc-shaped. A rubber sleeve is sleeved inside the rectifying hood. Both ends of the rubber sleeve are in a bell shape, and the top edge of the rubber sleeve is smoothly connected with the top edge of the rectifying hood. The device makes the waste liquid overflow to the evaporation tube wall through the rectifying hood to form a liquid film by pumping the liquid upward, and realizes the heating of the liquid film and the recovery of waste heat by circulating high-temperature steam in the evaporation tube, and has the advantages of simple and compact structure, low heat loss and low equipment energy consumption.

Description

Technical Field

[0001] The present invention relates to the field of evaporation concentration equipment, and in particular to a vertical tube falling film evaporation equipment with splash prevention. Background Art

[0002] The vertical tube falling film evaporation equipment is used for evaporating and concentrating waste liquid. The existing vertical tube falling film evaporation equipment uses high-temperature steam as the heat source. After heat exchange, the high-temperature steam flowing through the vertical tube falling film evaporation equipment still has relatively high heat. Generally, a heat exchange equipment is added outside the vertical tube falling film evaporation equipment to preheat the waste liquid by using the waste heat of the discharged high-temperature steam. Therefore, the vertical tube falling film evaporation equipment often needs to be used in cooperation with multiple different equipments, which results in a relatively high overall use and maintenance cost of the vertical tube falling film evaporation equipment, and the equipment occupies a large space. Therefore, in order to optimize the above problems, a vertical tube falling film evaporation equipment with splash prevention is proposed. Summary of the Invention

[0003] In view of the problem that the existing vertical tube falling film evaporation equipment needs to complete the recovery of waste heat of high-temperature steam and the preheating of waste liquid outside during operation in the above or existing technologies, resulting in a relatively high overall comprehensive cost of the equipment and a large occupied space, the present invention is proposed.

[0004] Therefore, the object of the present invention is to provide a vertical tube falling film evaporation equipment with splash prevention.

[0005] To solve the above technical problems, the present invention provides the following technical solution: A vertical tube falling film evaporation equipment with splash prevention, including an evaporation tank, and evaporation tubes are vertically arranged in the evaporation tank. A reflux tube is sleeved inside the evaporation tube, and a waste liquid tube is sleeved inside the reflux tube. The top of the evaporation tube is connected with a rectifying cover. The top of the rectifying cover is open, and the rectifying cover is wider at the bottom and narrower at the top. The peripheral wall of the rectifying cover is arc-shaped. A rubber sleeve is sleeved inside the rectifying cover. Both ends of the rubber sleeve are trumpet-shaped, and the top edge of the rubber sleeve is smoothly connected with the top edge of the rectifying cover. The bottom of the rectifying cover is closed. The tops of the waste liquid tube and the reflux tube are both connected with the bottom surface of the rectifying cover, and the waste liquid tube is communicated with the inside of the rectifying cover. A seal is maintained between the reflux tube and the waste liquid tube, and between the reflux tube and the rectifying cover.

[0006] As a preferred solution of the vertical tube falling film evaporation equipment with splash prevention of the present invention, among them: There is no direct contact between the evaporation tube, the reflux tube and the waste liquid tube, and the evaporation tube, the reflux tube and the waste liquid tube are coaxial. The peripheral wall of the top of the reflux tube is punched with reflux ports, and the reflux ports are distributed in a circular array with respect to the reflux tube.

[0007] As a preferred embodiment of the anti-splash vertical tube falling film evaporation device of the present invention, the following is provided: Inside the evaporation tank, a first partition, a second partition, and a third partition are arranged at the bottom, and the first partition is located on top of the second partition, and the third partition is located on top of the second partition. A waste liquid interface is arranged at the bottom of the evaporation tank side wall corresponding to the first partition, a steam reflux interface is arranged between the first partition and the second partition on the evaporation tank side wall, and a steam interface is arranged between the second partition and the third partition on the evaporation tank side wall.

[0008] As a preferred embodiment of the anti-splash vertical tube falling film evaporation device of the present invention, the following is provided: The bottom end of the evaporation tube communicates between the second partition and the third partition, the reflux tube communicates between the first partition and the second partition, and the waste liquid tube communicates with the bottom of the first partition.

[0009] As a preferred embodiment of the anti-splash vertical tube falling film evaporation device of the present invention, the following is provided: A valve plate is arranged inside the fairing, and the peripheral wall of the valve plate is circular and in sliding contact with the inner wall of the fairing. Guide columns are arranged in a circular array inside the fairing, and the diameter of the top of the guide column is larger than that of the bottom.

[0010] As a preferred embodiment of the anti-splash vertical tube falling film evaporation device of the present invention, the following is provided: First overflow grooves are arranged in a circular array in the middle of the valve plate, second overflow grooves are arranged in a circular array at the edge of the valve plate, and the number of guide columns matches the number of second overflow grooves, and one guide column is inserted into one second overflow groove in a matching manner.

[0011] As a preferred embodiment of the anti-splash vertical tube falling film evaporation device of the present invention, the following is provided: Struts are arranged in a circular array at the top end of the valve plate, and the top ends of the struts are fixedly connected on the axis of the valve plate.

[0012] As a preferred embodiment of the anti-splash vertical tube falling film evaporation device of the present invention, the following is provided: Strip-shaped grooves are provided on both the inner arc wall and the outer arc wall of the rubber sleeve, and the strip-shaped grooves are distributed in a circular array with respect to the rubber sleeve, and the strip-shaped grooves on the inner arc wall and the outer arc wall of the rubber sleeve are alternately arranged in position. The number of struts matches the number of strip-shaped grooves on the inner arc wall of the rubber sleeve, and the struts are in sliding contact with the strip-shaped grooves on the inner arc wall of the rubber sleeve.

[0013] As a preferred embodiment of the anti-splash vertical tube falling film evaporation device of the present invention, the following is provided: A buffer cover is arranged at the top inside the evaporation tank corresponding to the position of the fairing, and the buffer cover is in the shape of a downward-opening cylinder. A metal mesh is arranged inside the buffer cover, and the number of layers of the metal mesh is not less than three, and the mesh density of the metal mesh increases layer by layer from the bottom layer to the upper layer.

[0014] As a preferred embodiment of the anti-splash vertical tube falling film evaporation device of the present invention, the following is provided: A steam exhaust port is arranged at the top end of the evaporation tank, and a waste liquid discharge port is arranged on the side wall of the evaporation tank above the third partition.

[0015] Advantages of the anti-splash vertical tube falling film evaporation equipment of the present invention: The device pumps the liquid upward so that the waste liquid overflows to the evaporation tube wall through the fairing to form a liquid film, and the liquid film is heated and the waste heat (waste heat of the waste liquid) is recovered by circulating high-temperature steam in the evaporation tube. It has the advantages of simple and compact structure, low heat loss, and low equipment energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 It is a schematic diagram of the overall structure of the anti-splash vertical tube falling film evaporation equipment.

[0018] Figure 2 For the anti-splash vertical tube falling film evaporation equipment Figure 1 Structural cross-sectional view.

[0019] Figure 3 For the anti-splash vertical tube falling film evaporation equipment Figure 2 Schematic diagram of the structure after further dissection.

[0020] Figure 4 For the anti-splash vertical tube falling film evaporation equipment Figure 3 Enlarged view of the structure of A therein.

[0021] Figure 5 For the anti-splash vertical tube falling film evaporation equipment Figure 3 Enlarged view of the structure of B therein.

[0022] Figure 6 It is a sectional view of the fairing structure of the anti-splash vertical tube falling film evaporation equipment.

[0023] Figure 7 It is a sectional view of the fairing structure of the anti-splash vertical tube falling film evaporation equipment.

[0024] Figure 8 For the anti-splash vertical tube falling film evaporation equipment Figure 7 Schematic diagram of the structure from the bottom view.

[0025] Figure 9 It is a sectional view of the buffer cover structure of the anti-splash vertical tube falling film evaporation equipment.

[0026] In the figure: 100, evaporation tank; 101, evaporation tube; 102, reflux tube; 103, waste liquid tube; 104, fairing; 105, rubber sleeve; 106, first partition; 107, second partition; 108, third partition; 109, valve plate; 110, buffer cover; 100a, waste liquid interface; 100b, steam reflux interface; 100c, steam interface; 100d, steam exhaust port; 100e, waste liquid discharge port; 102a, reflux port; 104a, guide post; 105a, strip groove; 109a, first overflow groove; 109b, second overflow groove; 109c, support rod; 110a, metal mesh. Detailed implementation manners

[0027] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following provides a detailed description of the specific implementation manners of the present invention in conjunction with the accompanying drawings of the specification.

[0028] Example 1, referring to Figures 1 to 9 , which is the first embodiment of the present invention. This embodiment provides a vertical tube falling film evaporation device that can prevent splashing and achieve the effects of falling film evaporation and waste liquid waste heat inside the device. It includes an evaporation tank 100, and an evaporation tube 101 is vertically arranged inside the evaporation tank 100. A reflux tube 102 is sleeved inside the evaporation tube 101, and a waste liquid tube 103 is sleeved inside the reflux tube 102. The top of the evaporation tube 101 is connected to a fairing 104. The top of the fairing 104 is open, and the fairing 104 is wider at the bottom and narrower at the top. The peripheral wall of the fairing 104 is arc-shaped. A rubber sleeve 105 is sleeved inside the fairing 104. Both ends of the rubber sleeve 105 are in a horn shape, and the top edge of the rubber sleeve 105 is smoothly connected to the top edge of the fairing 104. The bottom of the fairing 104 is closed. The tops of the waste liquid tube 103 and the reflux tube 102 are both connected to the bottom surface of the fairing 104, and the waste liquid tube 103 is in communication with the inside of the fairing 104. A seal is maintained between the reflux tube 102 and the waste liquid tube 103, and between the reflux tube 102 and the fairing 104.

[0029] Specifically, the evaporation tube 101, the reflux tube 102, and the waste liquid tube 103 do not directly contact each other, and the evaporation tube 101, the reflux tube 102, and the waste liquid tube 103 are coaxial. The top peripheral wall of the reflux tube 102 is stamped with a reflux port 102a, and the reflux ports 102a are distributed in an annular array with respect to the reflux tube 102. Inside the evaporation tank 100 at the bottom, there are a first partition 106, a second partition 107, and a third partition 108. The first partition 106 is located on top of the second partition 107, and the third partition 108 is located on top of the second partition 107. At the bottom of the first partition 106 on the side wall of the evaporation tank 100, there is a waste liquid interface 100a. Between the first partition 106 and the second partition 107 on the side wall of the evaporation tank 100, there is a steam reflux interface 100b. Between the second partition 107 and the third partition 108 on the side wall of the evaporation tank 100, there is a steam interface 100c. At the top of the evaporation tank 100, there is a steam exhaust port 100d. Above the third partition 108 on the side wall of the evaporation tank 100, there is a waste liquid discharge port 100e.

[0030] Further illustrate the working principle and advantages of the device in combination with the prior art: The existing vertical tube falling film evaporation equipment forms a waste liquid film by spraying the waste liquid on the inner wall of the pipe, and the high-temperature steam exchanges heat with the waste liquid film through the pipe. The waste liquid film is heated and evaporated. In this type of falling film method, first, spraying is likely to cause splashing, resulting in a small amount of waste liquid not contacting the pipe wall to participate in the formation of the liquid film, but directly falling and being difficult to evaporate, ultimately affecting the waste liquid concentration. Second, the high-temperature steam needs to complete waste heat recovery and waste liquid preheating in an external heat exchange device. There are some heat losses during the transfer process of the high-temperature steam between different devices, and the independent heat exchange device will significantly increase the volume of the entire device and the use and maintenance costs.

[0031] The vertical tube falling film evaporation equipment provided by the present invention has multiple vertical evaporation tubes 101 inside the evaporation tank 100. Inside a single evaporation tube 101, the high-temperature steam flows upward from the gap between the inner wall of the evaporation tube 101 and the outer wall of the reflux tube 102. During this process, the waste liquid film flowing downward on the outer wall of the evaporation tube 101 is heated. After this heat exchange, the steam temperature drops significantly and enters the gap between the inner wall of the reflux tube 102 and the outer wall of the waste liquid tube 103 through the reflux port 102a at the top of the reflux tube 102 and flows downward (the reflux tube 102 is made of heat-insulating material). The waste liquid is preheated by using the waste heat of the refluxing steam through the pipe wall of the waste liquid tube 103.

[0032] The complete working process of the present invention is as follows: the waste liquid enters between the first partition plate 106 and the bottom of the evaporation tank 100 through the waste liquid interface 100a, and then enters each waste liquid pipe 103 and flows upward. After reaching the top, it overflows through the rubber sleeve 105 and the fairing 104 smoothly connected by an arc. Different from the spraying of conventional vertical tube falling film evaporation, the waste liquid of this device flows out in an overflow manner, and the required pump pressure is lower than that of conventional spraying falling film. Here, it is more energy-saving compared with the conventional spraying falling film technical means. After the waste liquid overflows from the top of the fairing 104, it flows downward along the outer wall of the fairing 104 to form a liquid film. The high-temperature steam enters between the second partition plate 107 and the third partition plate 108 through the steam interface 100c, and is then distributed to each evaporation tube 101. The liquid film is heated and evaporated and concentrated by the high-temperature steam flowing upward. The formed vapor is discharged from the vapor exhaust port 100d at the top of the device, and the concentrated waste liquid is discharged from the bottom waste liquid outlet. The steam after waste heat recovery is discharged from the steam return interface 100b.

[0033] In summary, this device pumps the liquid upward to make the waste liquid overflow to the wall of the evaporation tube 101 through the fairing 104 to form a liquid film, and realizes liquid film heating and waste heat recovery (waste heat of waste liquid) through the circulation of high-temperature steam in the evaporation tube 101, and has the advantages of simple and compact structure, low heat loss, and low equipment energy consumption.

[0034] Example 2, referring to Figure 4 、 Figures 6 to 8 , which is the second embodiment of the present invention. Different from the previous embodiment, this embodiment provides a vertical tube falling film evaporation device with anti-splash function, which solves the problem of interference of water pressure fluctuation on the falling film effect. It includes a valve plate 109 arranged in the fairing 104, and the peripheral wall of the valve plate 109 is annular and in sliding contact with the inner wall of the fairing 104. Guide posts 104a are arranged in an annular array in the fairing 104, and the diameter of the top of the guide post 104a is larger than that of the bottom. First overflow grooves 109a are arranged in an annular array in the middle of the valve plate 109, and second overflow grooves 109b are arranged in an annular array at the edge of the valve plate 109. The number of the guide posts 104a matches the number of the second overflow grooves 109b, and one guide post 104a is inserted into one second overflow groove 109b in a matching manner. Support rods 109c are arranged in an annular array at the top of the valve plate 109, and the tops of the support rods 109c are fixedly connected on the axis of the valve plate 109. Strip-shaped grooves 105a are opened on both the inner arc wall and the outer arc wall of the rubber sleeve 105. The strip-shaped grooves 105a are distributed in an annular array with respect to the rubber sleeve 105, and the strip-shaped grooves 105a on the inner arc wall and the outer arc wall of the rubber sleeve 105 are alternately arranged in position. The number of the support rods 109c matches the number of the strip-shaped grooves 105a on the inner arc wall of the rubber sleeve 105, and the support rods 109c are in sliding contact with the strip-shaped grooves 105a on the inner arc wall of the rubber sleeve 105.

[0035] Since the device forms a liquid film by overflowing the waste liquid from the top opening of the fairing 104, the waste liquid needs to flow slowly and stably. Therefore, in addition to the configured liquid pump having the above characteristics, a structure for regulating the flow rate and velocity of the waste liquid is designed inside the fairing 104 of the device.

[0036] The device mainly needs to avoid the splashing caused by the high-pressure jet of the waste liquid. Therefore, taking the sudden increase in the waste liquid pressure as an example, the way for the device to control the reduction of the flow rate is to reduce the flow area to achieve throttling, and the way for the device to control the reduction of the waste liquid velocity is to increase the flow area to achieve deceleration. The device realizes the above two opposite operations inside the fairing 104. The specific structure is as follows, referring to Figure 7 and Figure 8 , after the waste liquid enters the fairing 104, it needs to pass through the first overflow groove 109a and the second overflow groove 109b on the valve plate 109 to overflow from the rubber sleeve 105 out of the fairing 104. Under normal conditions, the valve plate 109 is pushed by the waste liquid, and the umbrella-shaped strut 109c at its top abuts against the inner arc wall of the rubber sleeve 105, so that the valve plate 109 is in force balance and will not move up or down. When the pressure in the waste liquid pipe 103 surges, the pressure balance between the bottom and top surfaces of the valve plate 109 is broken, causing the valve plate 109 and the strut 109c to move up a certain distance until a new balance is reached. During this process, the diameter of the guide post 104a passing through the second overflow groove 109b increases, and the flow area of the second overflow groove 109b is reduced to achieve the purpose of throttling. The strut 109c will expand the rubber sleeve 105 through the strip-shaped groove 105a on the rubber sleeve 105, increasing the outlet diameter to exchange the same flow rate for a lower velocity and avoiding the jet phenomenon.

[0037] In the above principle, it should be noted that reducing the flow area, when the pump pressure remains unchanged, is likely to increase the liquid velocity and cause the jet phenomenon. However, there is a certain liquid storage space between the top of the valve plate 109 and the liquid outlet of the rubber sleeve 105 in the fairing 104 of the device. As long as the device is running, this space is filled with waste liquid. The waste liquid in this part can block the waste liquid ejected from the first overflow groove 109a and the second overflow groove 109b under high pressure, so that the waste liquid in the waste liquid pipe 103 will not directly spray out of the fairing 104 from the valve plate 109.

[0038] All other structures are the same as those in Embodiment 1.

[0039] In summary, the device still has good working stability under the condition of hydraulic fluctuation of the waste liquid transportation.

[0040] Embodiment 3, referring to Figure 2 and Figure 9, which is the third embodiment of the present invention. Different from the previous embodiment, this embodiment provides a vertical tube falling film evaporation device with splash prevention, solving the splash problem caused by the violent fluctuation of the water pressure in the fairing 104. It includes a buffer cover 110 arranged at the corresponding position of the fairing 104 at the inner top of the evaporation tank 100. The buffer cover 110 is in the shape of a downward-opening cylinder. A metal mesh 110a is arranged inside the buffer cover 110, and the number of layers of the metal mesh 110a is not less than three. The mesh density of the metal mesh 110a increases layer by layer from the bottom layer to the upper layer.

[0041] Referring to Embodiment 2, in the extreme case where the self-adjusting structure of the waste liquid flow rate and flow in the fairing 104 fails, if the waste liquid inevitably sprays out from the top end of the fairing 104, then the sprayed waste liquid will be ejected into the buffer cover 110 at the top of the fairing 104. When the jet passes through the multiple layers of metal mesh 110a inside the buffer cover 110, it will be decelerated layer by layer to consume energy. And the metal mesh 110a is designed to be concave, and the density of the metal mesh 110a gradually increases from the lower layer to the upper layer. That is, it is relatively easy for the jet liquid to pass through the first layer of the metal mesh 110a, and the passing resistance gradually increases later, avoiding splashing when the jet liquid contacts the first layer of the metal mesh 110a, so that the waste liquid is buffered inside the buffer cover 110, and then the waste liquid flows down along the side wall of the buffer cover 110 and returns to the fairing 104 to form a liquid film.

[0042] All the other structures are the same as those in Embodiment 2.

[0043] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A splash-proof vertical tube falling film evaporation device, characterized in that: The invention comprises an evaporation tank (100), wherein an evaporation tube (101) is vertically arranged in the evaporation tank (100), a return tube (102) is sleeved in the evaporation tube (101), and a waste liquid tube (103) is sleeved in the return tube (102), and a fairing (104) is connected to the top of the evaporation tube (101), the top of the fairing (104) is open, and the fairing (104) is wide at the bottom and narrow at the top, the peripheral wall of the fairing (104) is arc-shaped, and a rubber sleeve (103) is sleeved in the fairing (104). 5), both ends of the rubber sleeve (105) are trumpet-shaped, and the top edge of the rubber sleeve (105) is smoothly connected to the top edge of the fairing (104), the bottom of the fairing (104) is closed, the top ends of the waste liquid pipe (103) and the return pipe (102) are connected to the bottom surface of the fairing (104), and the waste liquid pipe (103) is communicated with the inside of the fairing (104), and the return pipe (102) and the waste liquid pipe (103), as well as the return pipe (102) and the fairing (104) are kept sealed; A valve plate (109) is arranged in the fairing (104), and the peripheral wall of the valve plate (109) is in a circular ring shape and is in sliding contact with the inner wall of the fairing (104). Guide pillars (104a) are arranged in a circular array in the fairing (104), and the top diameter of the guide pillars (104a) is larger than the bottom diameter; The middle of the valve plate (109) is provided with a first overflow groove (109a) in a circular array, and the edge of the valve plate (109) is provided with a second overflow groove (109b) in a circular array, and the number of the guide pillars (104a) and the second overflow grooves (109b) matches, and one guide pillar (104a) is matched and plugged into one second overflow groove (109b); The top end of the valve plate (109) is provided with support rods (109c) in a ring array, and the top ends of the support rods (109c) are fixedly connected on the axis of the valve plate (109).

2. The splash-proof vertical tube falling film evaporation device according to claim 1, characterized in that: The evaporation tube (101), the return tube (102) and the waste liquid tube (103) are not in direct contact with each other, and the evaporation tube (101), the return tube (102) and the waste liquid tube (103) are coaxial, a return port (102a) is punched on the peripheral wall of the top end of the return tube (102), and the return ports (102a) are distributed in a ring array with respect to the return tube (102).

3. The splash-proof vertical tube falling film evaporation device according to claim 2, characterized in that: A first partition (106), a second partition (107) and a third partition (108) are arranged at the bottom of the evaporation tank (100), the first partition (106) is located on the top of the second partition (107), the third partition (108) is located on the top of the second partition (107), a waste liquid interface (100a) is arranged on the side wall of the evaporation tank (100) at the bottom of the first partition (106), a steam reflux interface (100b) is arranged on the side wall of the evaporation tank (100) between the first partition (106) and the second partition (107), and a steam interface (100c) is arranged on the side wall of the evaporation tank (100) between the second partition (107) and the third partition (108).

4. The splash-proof vertical tube falling film evaporation device according to claim 3, characterized in that: The bottom end of the evaporation tube (101) is connected between the second partition (107) and the third partition (108), the reflux tube (102) is connected between the first partition (106) and the second partition (107), and the waste liquid tube (103) is connected to the bottom of the first partition (106).

5. The splash-proof vertical tube falling film evaporation device according to claim 4, characterized in that: The inner arc wall and the outer arc wall of the rubber sleeve (105) are both provided with strip grooves (105a), the strip grooves (105a) are distributed in a ring array with respect to the rubber sleeve (105), and the strip grooves (105a) on the inner arc wall and the outer arc wall of the rubber sleeve (105) are distributed in alternating positions, the number of the support rods (109c) matches the number of the strip grooves (105a) on the inner arc wall of the rubber sleeve (105), and the support rods (109c) are in sliding contact with the strip grooves (105a) on the inner arc wall of the rubber sleeve (105).

6. The splash-proof vertical tube falling film evaporation device according to claim 5, characterized in that: A buffer cover (110) is arranged at a position corresponding to the fairing (104) on the top of the evaporator (100), and the buffer cover (110) is in a cylindrical shape with an opening facing downward. A metal mesh (110a) is arranged in the buffer cover (110), and the number of layers of the metal mesh (110a) is not less than three, and the mesh density of the metal mesh (110a) increases layer by layer from the bottom layer to the upper layer.

7. The splash-proof vertical tube falling film evaporation device according to claim 6, characterized in that: The top of the evaporation tank (100) is provided with a steam exhaust port (100d), and the side wall of the evaporation tank (100) is provided with a waste liquid outlet (100e) at the upper part of the third partition plate (108).

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