Anti-splashing vertical pipe falling film evaporation equipment

Abstract

The invention relates to the field of evaporation and concentration equipment, in particular to anti-splashing vertical pipe falling film evaporation equipment which comprises an evaporation tank, an evaporation pipe is vertically arranged in the evaporation tank, a return pipe is sleeved with the evaporation pipe, a waste liquid pipe is sleeved with the return pipe, the top end of the evaporation pipe is connected with a fairing, the top end of the fairing is open, and the fairing is wide in lower portion and narrow in upper portion. The peripheral wall of the fairing is in an arc shape, a rubber sleeve is sleeved with the fairing, the two ends of the rubber sleeve are in a horn shape, and the top edge of the rubber sleeve is smoothly connected with the top edge of the fairing. The device pumps liquid upwards to enable waste liquid to overflow to the wall of the evaporation pipe through the fairing to form a liquid film, liquid film heating and waste heat recovery are achieved through circulation of high-temperature steam in the evaporation pipe, and the device has the advantages of being simple and compact in structure, low in heat loss and low in equipment energy consumption.

Description

Technical Field

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

[0002] Vertical tube falling film evaporation equipment is used for evaporation and concentration of waste liquid. The existing vertical tube falling film evaporation equipment uses high-temperature steam as a heat source. The high-temperature steam flowing through the vertical tube falling film evaporation equipment still has a high heat after heat exchange. Generally, a heat exchange device is added to the outside of the vertical tube falling film evaporation equipment to preheat the waste liquid using the waste heat of the discharged high-temperature steam. Therefore, the vertical tube falling film evaporation equipment often requires the coordination of multiple different devices, which leads to a high overall use and maintenance cost of the vertical tube falling film evaporation equipment and a large space occupied by the equipment. Therefore, in order to optimize the above problems, an anti-splash vertical tube falling film evaporation equipment is proposed. Summary of the invention

[0003] In view of the above or existing problems in the prior art that the existing vertical tube falling film evaporation equipment needs to complete high-temperature steam waste heat recovery and waste liquid preheating externally when working, resulting in high overall comprehensive cost of the equipment and large space occupation, the present invention is proposed.

[0004] Therefore, an object of the present invention is to provide a vertical tube falling film evaporation device which is splash-proof.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a splash-proof vertical tube falling film evaporation device, comprising an evaporation tank, and an evaporation tube is vertically arranged in the evaporation tank, a return pipe is sleeved in the evaporation tube, and a waste liquid pipe is sleeved in the return pipe, the top of the evaporation tube is connected to a fairing, the top of the fairing is open, and the fairing is wide at the bottom and narrow at the top, the surrounding wall of the fairing is arc-shaped, a rubber sleeve is sleeved in the fairing, both ends of the rubber sleeve are trumpet-shaped, and the top edge of the rubber sleeve is smoothly connected to the top edge of the fairing, the bottom of the fairing is closed, the top ends of the waste liquid pipe and the return pipe are connected to the bottom surface of the fairing, and the waste liquid pipe is connected to the inside of the fairing, and the return pipe and the waste liquid pipe, as well as the return pipe and the fairing are kept sealed.

[0006] As a preferred solution of the splash-proof vertical tube falling film evaporation equipment of the present invention, the evaporation tube, the reflux tube and the waste liquid tube are not in direct contact with each other, and are coaxial with each other. A reflux port is stamped on the top peripheral wall of the reflux tube, and the reflux port is distributed in a ring array about the reflux tube.

[0007] As a preferred solution of the splash-proof vertical tube falling film evaporation device of the present invention, the first partition, the second partition and the third partition are arranged at the bottom of the evaporator, and the first partition is located on the top of the second partition, and the third partition is located on the top of the second partition, and the side wall of the evaporator is located at the bottom of the first partition and provided with a waste liquid interface, the side wall of the evaporator is located between the first partition and the second partition and provided with a steam reflux interface, and the side wall of the evaporator is located between the second partition and the third partition and provided with a steam interface.

[0008] As a preferred solution of the splash-proof vertical tube falling film evaporation equipment of the present invention, the bottom end of the evaporation tube is connected between the second partition and the third partition, the reflux pipe is connected between the first partition and the second partition, and the waste liquid pipe is connected to the bottom of the first partition.

[0009] As a preferred solution of the splash-proof vertical tube falling film evaporation equipment of the present invention, a valve plate is arranged in the fairing, and the peripheral wall of the valve plate is in a circular ring shape and is in sliding contact with the inner wall of the fairing, and guide pillars are arranged in a circular array in the fairing, and the top diameter of the guide pillars is larger than the bottom diameter.

[0010] As a preferred solution of the splash-proof vertical tube falling film evaporation device of the present invention, the first overflow groove is opened in a ring array in the middle of the valve plate, the second overflow groove is opened in a ring array at the edge of the valve plate, and the number of guide columns matches that of the second overflow grooves, and one guide column is matched and plugged into one second overflow groove.

[0011] As a preferred solution of the splash-proof vertical tube falling film evaporation device of the present invention, the top end of the valve plate is provided with support rods in a ring array, and the top ends of the support rods are fixedly connected on the axis of the valve plate.

[0012] As a preferred solution of the splash-proof vertical tube falling film evaporation equipment of the present invention, the inner arc wall and the outer arc wall of the rubber sleeve are both provided with strip grooves, the strip grooves are distributed in a ring array about the rubber sleeve, and the strip grooves of the inner arc wall and the outer arc wall of the rubber sleeve are distributed alternately in position, the number of strip grooves of the support rod matches that of the inner arc wall of the rubber sleeve, and the support rod is in sliding contact with the strip grooves of the inner arc wall of the rubber sleeve.

[0013] As a preferred solution of the splash-proof vertical tube falling film evaporation equipment of the present invention, a buffer cover is arranged at the position of the fairing on the top of the evaporation tank, and the buffer cover is in a downwardly opening cylindrical shape, and a metal mesh is arranged in 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 solution of the splash-proof vertical tube falling film evaporation device of the present invention, a steam exhaust port is arranged at the top of the evaporation tank, and a waste liquid outlet is arranged at the upper part of the third partition on the side wall of the evaporation tank.

[0015] The beneficial effects of the splash-proof vertical tube falling film evaporation equipment of the present invention are as follows: the device pumps liquid upward so that the waste liquid overflows to the evaporation tube wall through the fairing to form a liquid film, and realizes liquid film heating and waste heat recovery (waste liquid waste heat) 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 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.

[0017] Figure 1 Schematic diagram of the overall structure of the vertical tube falling film evaporation equipment to prevent splashing.

[0018] Figure 2 Vertical tube falling film evaporation equipment for splash prevention Figure 1 Structural cross-section view.

[0019] Figure 3 Vertical tube falling film evaporation equipment for splash prevention Figure 2 Schematic diagram of the structure after further dissection.

[0020] Figure 4 Vertical tube falling film evaporation equipment for splash prevention Figure 3 A is an enlarged view of the structure.

[0021] Figure 5 Vertical tube falling film evaporation equipment for splash prevention Figure 3 A magnified view of the structure of B.

[0022] Figure 6 Schematic diagram of the fairing structure of the vertical tube falling film evaporation equipment to prevent splashing.

[0023] Figure 7 A cross-sectional view of the fairing structure of a vertical tube falling film evaporation device to prevent splashing.

[0024] Figure 8 Vertical tube falling film evaporation equipment for splash prevention Figure 7 Schematic diagram of the structure from bottom perspective.

[0025] Fig. 9 A cross-sectional view of the buffer cover structure of a vertical tube falling film evaporation device to prevent splashing.

[0026] In the figure: 100, evaporator; 101, evaporator tube; 102, reflux tube; 103, waste liquid tube; 104, fairing; 105, rubber sleeve; 106, first baffle; 107, second baffle; 108, third baffle; 109, valve plate; 110, buffer cover; 100a, waste liquid interface; 100b, steam reflux interface; 100c, steam interface; 100d, steam exhaust port; 100e, waste liquid outlet; 102a, reflux port; 104a, guide column; 105a, strip groove; 109a, first overflow groove; 109b, second overflow groove; 109c, support rod; 110a, metal mesh. DETAILED DESCRIPTION

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0028] Example 1, reference Figure 1 to Figure 9 , which is the first embodiment of the present invention, provides a splash-proof vertical tube falling film evaporation device, which can achieve the effect of falling film evaporation and waste heat of waste liquid inside the device, and includes an evaporation tank 100, and an evaporation tube 101 is vertically arranged in the evaporation tank 100, a return pipe 102 is sleeved in the evaporation tube 101, and a waste liquid pipe 103 is sleeved in the return pipe 102, and a fairing 104 is connected to the top of the evaporation tube 101, and 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 105 is sleeved inside the fairing 104. 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, and 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 connected to the inside of the fairing 104, and the return pipe 102 and the waste liquid pipe 103, and the return pipe 102 and the fairing 104 are kept sealed.

[0029] Specifically, 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, the top peripheral wall of the return tube 102 is punched with a return port 102a, and the return ports 102a are distributed in a ring array with respect to the return tube 102, and the first partition 106, the second partition 107 and the third partition 108 are arranged at the bottom of the evaporation tank 100, and the first partition 106 is located on the top of the second partition 107, and the third partition 108 is located on the second partition 107. A waste liquid interface 100a is provided at the top of the partition 107, a side wall of the evaporation tank 100 is located at the bottom of the first partition 106, a steam reflux interface 100b is provided on the side wall of the evaporation tank 100 between the first partition 106 and the second partition 107, a steam interface 100c is provided on the side wall of the evaporation tank 100 between the second partition 107 and the third partition 108, a steam exhaust port 100d is provided at the top of the evaporation tank 100, and a waste liquid outlet 100e is provided on the side wall of the evaporation tank 100 located at the upper part of the third partition 108.

[0030] The working principle and advantages of the device are further explained in combination with the existing technology: the existing vertical tube falling film evaporation equipment forms a waste liquid film by spraying waste liquid on the inner wall of the pipe, and the high-temperature steam exchanges heat with the waste liquid film through the pipe, and the waste liquid film heats up and evaporates. This type of falling film method is that spraying is prone to splashing, resulting in a small amount of waste liquid not contacting the pipe wall to participate in the formation of the liquid film, but falling directly and difficult to be evaporated, which ultimately affects the concentration of the waste liquid. In addition, high-temperature steam needs to complete waste heat recovery and waste liquid preheating in external heat exchange equipment. There is some heat loss in the transfer process of high-temperature steam between different equipment, and an 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 device provided by the present invention has a plurality of vertical evaporation tubes 101 in the evaporation tank 100. In a single evaporation tube 101, the high-temperature steam flows from bottom to top through the gap between the inner wall of the evaporation tube 101 and the outer wall of the return tube 102. In this process, the waste liquid film flowing downward on the outer wall of the evaporation tube 101 is heated. After the heat exchange, the steam temperature drops significantly, and enters the gap between the inner wall of the return tube 102 and the outer wall of the waste liquid tube 103 through the return port 102a at the top of the return tube 102 and flows from top to bottom (the return tube 102 is made of heat-insulating material). The waste liquid is preheated by the waste heat of the refluxed steam through the tube wall of the waste liquid tube 103.

[0032] The complete working process of the present invention is that the waste liquid enters between the first partition plate 106 and the tank bottom of the evaporation tank 100 from the waste liquid interface 100a, and then enters each waste liquid pipe 103 and flows from bottom to top. After reaching the top, it overflows from the rubber sleeve 105 and the fairing 104 connected smoothly by the arc. Different from the spray of the conventional vertical tube falling film evaporation, the waste liquid of the device flows out in an overflow manner, and the required pump pressure is lower than that of the conventional spray falling film. Here, it is more energy-saving than the conventional spray 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 from bottom to top. The formed steam is discharged from the steam exhaust port 100d at the top of the equipment, and the concentrated waste liquid is discharged from the bottom waste liquid outlet. The steam after waste heat recovery is discharged from the steam reflux interface 100b.

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

[0034] Example 2, reference Figure 4 , Figure 6~Figure 8 , which is the second embodiment of the present invention. Different from the previous embodiment, this embodiment provides a splash-proof vertical tube falling film evaporation device, which solves the problem of water pressure fluctuation interfering with the falling film effect. It includes: 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, and guide pillars 104a are arranged in an annular array in the fairing 104, and the top diameter of the guide pillars 104a is larger than the bottom diameter, the middle part of the valve plate 109 is provided with a first overflow groove 109a in an annular array, and the edge of the valve plate 109 is provided with a second overflow groove 109b in an annular array, and the guide pillars 104a and the second overflow groove 109b are provided. 09b are matched in number, a guide column 104a is matched and plugged into a second overflow groove 109b, the top of the valve plate 109 is provided with a support rod 109c in an annular array, and the tops of the support rods 109c are fixedly connected on the axis of the valve plate 109, 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 an annular array with respect to the rubber sleeve 105, and the strip grooves 105a of 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 and the strip grooves 105a of the inner arc wall of the rubber sleeve 105 matches, and the support rods 109c are in sliding contact with the strip grooves 105a of the inner arc wall of the rubber sleeve 105.

[0035] Since the device forms a liquid film by overflowing the waste liquid from the opening at the top of the fairing 104, the waste liquid needs to flow slowly and steadily. Therefore, in addition to the configured liquid pump needing to have the above characteristics, a structural design for regulating the flow and flow rate of the waste liquid is also designed inside the fairing 104 of the device.

[0036] The device mainly needs to avoid splashing caused by high-pressure injection of waste liquid. Therefore, taking the sudden increase of waste liquid pressure as an example, the device controls the flow rate to be reduced by reducing the flow area to achieve throttling, and the device controls the flow rate to be reduced by increasing the flow area to achieve deceleration. The device simultaneously realizes the above two opposite operations in the fairing 104. The specific structure is as follows: 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 the fairing 104 from the rubber sleeve 105. Under normal conditions, the valve plate 109 is pushed by the waste liquid, and the umbrella-shaped support rod 109c on its top contacts the inner arc wall of the rubber sleeve 105, so that the force balance of the valve plate 109 will not move upward or downward. 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 support rod 109c to move upward for a distance until a new balance is reached. During the process, the diameter of the guide column 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 support rod 109c will open it through the strip groove 105a on the rubber sleeve 105, increase the outlet diameter in exchange for a lower flow rate with the same flow rate, and avoid injection.

[0037] In the above principle, it is also necessary to note that reducing the flow area will easily increase the liquid flow rate and cause the injection phenomenon when the pump pressure remains unchanged. The fairing 104 of the device is located between the top of the valve plate 109 and the liquid outlet of the rubber sleeve 105 and has a certain liquid storage space. As long as the equipment is running, the space is filled with waste liquid. This part of the waste liquid 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 be directly ejected from the valve plate 109 to the outside of the fairing 104.

[0038] The rest of the structure is the same as that of Example 1.

[0039] In summary, the device still has good working stability when the hydraulic pressure of waste liquid transportation fluctuates.

[0040] Example 3, reference Figure 2 and Fig. 9, which is the third embodiment of the present invention. Different from the previous embodiment, this embodiment provides a splash-proof vertical tube falling film evaporation device, which solves the splashing problem caused by the drastic fluctuation of water pressure in the fairing 104. It includes: a buffer cover 110 is arranged at the top of the evaporator 100 corresponding to the fairing 104, and the buffer cover 110 is in a downward cylindrical shape. 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 layers, and the mesh density of the metal mesh 110a increases layer by layer from the bottom layer to the upper layer.

[0041] Referring to Example 2, in the extreme case where the self-regulating structure of the waste liquid flow rate in the fairing 104 fails, if the waste liquid inevitably sprays out from the top of the fairing 104, the sprayed waste liquid will be sprayed into the buffer cover 110 on 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 concave in design, and the density of the metal mesh 110a gradually increases from the lower layer to the upper layer. That is, it is easier for the ejected liquid to pass through the first layer of the metal mesh 110a, and then the passing resistance is gradually increased to avoid splashing when the ejected 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 falls back onto the fairing 104 to form a liquid film.

[0042] The rest of the structure is the same as that of Example 2.

[0043] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in 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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