A steel belt type falling film evaporation and concentration device

Abstract

The present invention relates to the field of evaporation concentration equipment, in particular to a steel belt type falling film evaporation concentration device, which includes a horizontally arranged box body. A thin steel belt is arranged inside the box body, the top of the thin steel belt is horizontal, and a distribution box is sleeved inside the thin steel belt along its width direction. The thin steel belt inside the box body of this device has a wavy bottom structure. Through the continuous operation of the thin steel belt, the waste liquid adheres to the surface of the thin steel belt to form a thin water film, and heat exchange is carried out with the high-temperature steam with an optimized flow path inside the thin steel belt, so as to continuously and quickly carry out evaporation concentration. The pressure balance component of this device automatically adjusts to the state where the pressure difference fluctuates to balance based on the change of the pressure difference inside and outside the thin steel belt, enabling the device to operate stably and smoothly. This device can also conveniently increase or decrease the number of box bodies to meet the production scale requirements of different sizes, which can greatly reduce the manufacturing cost of falling film evaporation concentration equipment of different specifications, and is convenient for assembly, use and maintenance.

Description

Technical Field

[0001] The present invention relates to the field of evaporation concentration equipment, and in particular to a steel belt type falling film evaporation concentration device. Background Art

[0002] Falling film evaporation concentration generally refers to spraying high-salt wastewater downward onto the surface of a high-temperature heating component, so that the high-salt wastewater is rapidly evaporated and concentrated during the downward flow in the form of a water film. Generally, the heat source for evaporation is high-temperature steam.

[0003] Existing falling film evaporation equipment is classified according to the arrangement direction of heating steam pipes, and is divided into horizontal pipe falling film evaporation concentration equipment and vertical pipe falling film evaporation concentration equipment. These two mainstream methods of achieving concentration by water film evaporation have one thing in common. High-salt wastewater flows from the top of the equipment to the bottom of the equipment without circulation or repeated falling film. Therefore, there are relatively high technical requirements for the heating power and heat exchange efficiency of the equipment. Although the basic principle of the equipment and the internal structure form of the evaporation tank are relatively simple, the slender steam heating pipes densely arranged in the evaporation tank are not convenient to manufacture, and the costs of use and maintenance are also relatively high. Moreover, it is difficult to miniaturize (a long falling film process is required, corresponding to a relatively large equipment volume). Therefore, in order to optimize the above problems, a steel belt type falling film evaporation concentration device is proposed. Summary of the Invention

[0004] In view of the problems in the above or existing falling film evaporation concentration equipment that are inconvenient to manufacture, use, maintain, and difficult to miniaturize, the present invention is proposed.

[0005] Therefore, the purpose of the present invention is to provide a steel belt type falling film evaporation concentration device.

[0006] To solve the above technical problems, the present invention provides the following technical solution: A steel belt type falling film evaporation concentration device, including a horizontally arranged box body. A thin steel belt is arranged inside the box body. The top of the thin steel belt is horizontal. A distribution box is sleeved along the width direction of the thin steel belt, and the distribution boxes are evenly distributed along the length direction of the thin steel belt. One end of the distribution box is sealed and the other end is open. Distribution holes are provided on the side wall of the distribution box, and the open end of the distribution box is fixedly inserted into the side wall of the box body in a sealed manner. The bottom of the thin steel belt is arranged in a wavy shape along the outer wall of the distribution box, and a rotating shaft is sleeved at each turning point of the thin steel belt. The edge of the thin steel belt is in sealed sliding connection with the inner wall of the box body. A first steam pipe is arranged outside the box body on the side of the open end of the distribution box, and a second steam pipe and an evaporation pipe are arranged on the other side of the box body. Both the first steam pipe and the second steam pipe penetrate through the side wall of the box body and are communicated with the inside of the distribution box. The evaporation pipe is communicated with the box body between the outer wall of the thin steel belt and the inner wall of the box body.

[0007] As a preferred embodiment of the steel belt type falling film evaporation and concentration device of the present invention, the following is provided: the box body is rectangular, the box bodies are stacked in the vertical direction, and the box bodies are connected in parallel. Feed pipes and discharge pipes are respectively arranged on both sides of the box body. Both the feed pipe and the discharge pipe are connected to the box body between the outer wall of the thin steel belt and the inner wall of the box body. The discharge pipe is connected to the bottom edge of the box body. Solenoid valves are arranged between the feed pipe and the box body, and between the discharge pipe and the box body.

[0008] As a preferred embodiment of the steel belt type falling film evaporation and concentration device of the present invention, the following is provided: the included angle between the top surface and one side of the dispersion box is ninety degrees, and the dispersion holes are distributed on the vertical wall and the inclined wall of the dispersion box.

[0009] As a preferred embodiment of the steel belt type falling film evaporation and concentration device of the present invention, the following is provided: sliding grooves are respectively formed on the inner walls of both sides of the box body to match the thin steel belt. The edge of the thin steel belt is slidably connected to the sliding groove, and sealing rubber strips are arranged on both sides of the edge of the thin steel belt in the sliding groove.

[0010] As a preferred embodiment of the steel belt type falling film evaporation and concentration device of the present invention, the following is provided: a pressure balance assembly is arranged at the top end of the box body, which includes a cylinder barrel. End covers are hermetically arranged at both ends of the cylinder barrel. A piston is hermetically and slidably connected in the cylinder barrel. Steel pipes are coaxially connected to both ends of the piston. The steel pipes penetrate through the end covers and are hermetically and slidably sleeved with the end covers. A sliding cover is fixedly connected to the end of the steel pipe far away from the piston. A rotary connection head is hermetically inserted into the end of the steel pipe far away from the piston.

[0011] As a preferred embodiment of the steel belt type falling film evaporation and concentration device of the present invention, the following is provided: the rotary connection head is Z-shaped, and the interfaces at both ends of the rotary connection head are circular. The middle section of the rotary connection head is rectangular. The interface at the end of the rotary connection head far away from the piston is vertically downward. The interface at the other end of the rotary connection head is vertically upward, and the middle section of the rotary connection head is horizontally arranged.

[0012] As a preferred embodiment of the steel belt type falling film evaporation and concentration device of the present invention, the following is provided: the steel pipe is connected to the top of the sliding cover, and the bottom surface of the sliding cover fits and slides with the inner bottom surface of the rotary connection head. The rotary connection head and the sliding cover are symmetrically arranged with respect to both sides of the box body.

[0013] As a preferred embodiment of the steel belt type falling film evaporation and concentration device of the present invention, the following is provided: the bottom interfaces of the two rotary connection heads are respectively connected to the first steam pipe and the evaporation pipe. A notch is formed on the peripheral wall of the end of the steel pipe connected to the piston. The notch communicates with the rotary connection head, the steel pipe and the cylinder barrel.

[0014] As a preferred embodiment of the steel-belt falling film evaporation and concentration device of the present invention, one end of the rotating shaft is provided with an input shaft along its axial direction, and the input shaft extends outside the box body. Shaft seals are provided between the input shaft and the inner and outer walls of the box body.

[0015] As a preferred embodiment of the steel-belt falling film evaporation and concentration device of the present invention, one end of the box body is provided with a motor, and belt pulleys are provided on the output shaft and the input shaft of the motor, and the belt pulleys are connected by a belt.

[0016] The beneficial effects of the steel-belt falling film evaporation and concentration device of the present invention: The thin steel belt in the device box body has a wavy bottom structure. Through the continuous operation of the thin steel belt, the waste liquid adheres to the surface of the thin steel belt to form a thin water film, and heat exchange is carried out with the high-temperature steam with an optimized flow path inside the thin steel belt, so as to continuously and quickly carry out evaporation and concentration. The pressure balance component of the device automatically adjusts to the state where the pressure difference fluctuates to balance based on the change of the pressure difference inside and outside the thin steel belt, so that the device can operate stably and smoothly. The device can also conveniently increase or decrease the number of box bodies to meet the production scale requirements of different sizes, which can greatly reduce the manufacturing cost of falling film evaporation and concentration equipment of different specifications, and is convenient for assembly, use and maintenance. Description of the Drawings

[0017] 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 following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0018] Figure 1 It is a schematic diagram of the overall structure of the steel-belt falling film evaporation and concentration device.

[0019] Figure 2 For the steel-belt falling film evaporation and concentration device Figure 1 Schematic diagram of the structure from the other side view.

[0020] Figure 3 It is a schematic diagram of the box body structure of the steel-belt falling film evaporation and concentration device.

[0021] Figure 4 For the steel-belt falling film evaporation and concentration device Figure 3 Structural cross-sectional view.

[0022] Figure 5 For the steel-belt falling film evaporation and concentration device Figure 4 Enlarged view of the structure of A in it.

[0023] Figure 6 For the steel-belt falling film evaporation and concentration deviceFigure 4 Front view.

[0024] Figure 7 For the steel belt type falling film evaporation and concentration device Figure 3 Structure dissection diagram.

[0025] Figure 8 For the steel belt type falling film evaporation and concentration device Figure 7 Structure schematic diagram from another perspective.

[0026] Figure 9 Structure cross-sectional view of the distribution box of the steel belt type falling film evaporation and concentration device.

[0027] Figure 10 Structure cross-sectional view of the pressure balance component of the steel belt type falling film evaporation and concentration device.

[0028] Figure 11 For the steel belt type falling film evaporation and concentration device Figure 10 Enlarged structure diagram of B in it.

[0029] In the figure: 100, box body; 101, thin steel belt; 102, distribution box; 103, rotating shaft; 104, steam pipe 1; 105, steam pipe 2; 106, evaporation pipe; 107, feed pipe; 108, discharge pipe; 109, solenoid valve; 110, cylinder barrel; 111, piston; 112, end cover; 113, steel pipe; 114, sliding cover; 115, adapter nipple; 100a, chute; 100b, sealing strip; 102a, distribution hole; 103a, input shaft; 103b, shaft seal; 103c, belt pulley; 113a, notch. Specific implementation mode

[0030] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the specific implementation mode of the present invention will be described in detail below with reference to the accompanying drawings of the specification.

[0031] Example 1, refer to Figures 1 to 11, which is the first embodiment of the present invention. This embodiment provides a steel belt type falling film evaporation concentration device, which can achieve the effect of continuous and efficient evaporation and concentration with a relatively simple structure and a small equipment volume. It includes a horizontally arranged box body 100. Inside the box body 100, there is a thin steel belt 101. The top of the thin steel belt 101 is horizontal. Inside the thin steel belt 101, a distribution box 102 is sleeved along its width direction, and the distribution boxes 102 are evenly distributed along the length direction of the thin steel belt 101. One end of the distribution box 102 is sealed and the other end is open. Distribution holes 102a are opened on the side wall of the distribution box 102, and the open end of the distribution box 102 is hermetically and fixedly inserted into the side wall of the box body 100. The bottom of the thin steel belt 101 is arranged in a wavy shape along the outer wall of the distribution box 102, and a rotating shaft 103 is sleeved at each turning point of the thin steel belt 101. The edge of the thin steel belt 101 is hermetically and slidably connected to the inner wall of the box body 100. Outside the box body 100, on one side of the opening of the distribution box 102, there is a first steam pipe 104, and on the other side of the box body 100, there are a second steam pipe 105 and an evaporation pipe 106. Both the first steam pipe 104 and the second steam pipe 105 penetrate the side wall of the box body 100 and communicate with the inside of the distribution box 102. The evaporation pipe 106 communicates with the box body 100 between the outer wall of the thin steel belt 101 and the inner wall of the box body 100. One end of the rotating shaft 103 is provided with an input shaft 103a along its axial direction, and the input shaft 103a extends outside the box body 100. Sealing glands 103b are arranged between the input shaft 103a and both the inner wall and the outer wall of the box body 100. At one end of the box body 100, there is a motor, and pulley 103c is arranged on both the output shaft of the motor and the input shaft 103a, and the pulleys 103c are connected by a belt.

[0032] Specifically, the box body 100 is rectangular. The box bodies 100 are stacked vertically and are connected in parallel. On both sides of the box body 100, there are respectively a feed pipe 107 and a discharge pipe 108. Both the feed pipe 107 and the discharge pipe 108 are connected to the box body 100 between the outer wall of the thin steel belt 101 and the inner wall of the box body 100, and the discharge pipe 108 is connected to the bottom edge of the box body 100. Solenoid valves 109 are arranged between the feed pipe 107 and the box body 100 and between the discharge pipe 108 and the box body 100. The included angle between the top surface and one side of the distribution box 102 is 90 degrees, and the distribution holes 102a are distributed on the vertical wall and the inclined wall of the distribution box 102. On both inner walls of the box body 100, chutes 100a are provided to match the thin steel belt 101. The edge of the thin steel belt 101 is slidably connected to the chute 100a, and sealing rubber strips 100b are arranged on both sides of the edge of the thin steel belt 101 in the chute 100a.

[0033] The principle and advantages of this device are further explained in combination with the prior art: The existing horizontal tube falling film evaporation and concentration equipment mainly relies on arranging steam pipes with relatively thin diameters at a high density in a horizontally placed tank to increase the heating contact area. For the vertical tube falling film evaporation and concentration equipment, it requires a relatively high tower height to ensure sufficient evaporation time during the downward flow of high-salt wastewater. In the former, a large number of steam pipes in the tank during production rely on welding and flaw detection, while the latter is relatively large in size and usually needs to be installed outdoors.

[0034] The present invention mainly proposes a structure that can continuously recycle and generate a high-salt wastewater film for efficient evaporation and concentration. It mainly relies on the wavy structure at the bottom of the thin steel belt 101 in the box body 100. The peaks and valleys of the wavy part are in contact with the waste liquid at the bottom of the box body 100. As the thin steel belt 101 continuously rotates around the roller, the waste liquid is carried out of the liquid surface by the thin steel belt 101 due to adhesion and other reasons, forming a thin water film on the bottom surface of the thin steel belt 101. Through heat exchange between the thin steel belt 101 and the high-temperature steam flowing inside it, rapid evaporation and concentration are achieved. The thin steel belt 101 continuously circulates and rotates, and the waste liquid in the box body 100 is continuously concentrated until the concentration reaches the standard and then is discharged.

[0035] To achieve the above object, the device also has the following technical details:

[0036] Firstly, referring to Figure 6 , the wavy inner wall at the bottom of the thin steel belt 101 is parallel to the vertical wall and the inclined wall of the distribution box 102. Taking Figure 6 the perspective as an example, the running direction of the thin steel belt 101 is that the thin steel belt 101 runs as the rotating shaft 103 rotates clockwise. This makes the high-salt wastewater dipped by the bottom of the thin steel belt 101 move obliquely upward, reducing the upward acting force of the gravity of the high-salt wastewater in the opposite direction of the moving direction of the thin steel belt 101 (locally, specifically referring to the inclined part of the thin steel belt 101), thereby enabling the thin steel belt 101 to carry out a larger area of water film from the high-salt wastewater at the bottom of the box body 100 and improving the working efficiency of the equipment.

[0037] Secondly, referring to Figure 8 and Figure 9 , the high-temperature steam enters the distribution box 102 through the steam pipe 104. The high-temperature steam flow is preferentially distributed to the wavy bottom of the thin steel belt 101 through the distribution holes 102a on the distribution box 102 to optimize the heat exchange efficiency of the water film evaporation. Subsequently, the high-temperature steam flows out of the box body 100 through the steam pipe 105.

[0038] Thirdly, referring to Figure 7 and Figure 8, the edges of the thin steel strip 101 are sealed by the sliding grooves 100a on the inner wall of the box body 100 and the sealing rubber strips 100b in the sliding grooves 100a, so as to form a sealed space for circulating high-temperature steam between the thin steel strip 101 and the inner walls on both sides of the box body 100. However, in this structure, in order to reduce the frictional resistance of the thin steel strip 101 during operation, in addition to using a circular cross-section for the sealing rubber strip 100b, the extrusion pressure of the sealing rubber strip 100b on the edge of the thin steel strip 101 is relatively low. In order to ensure the effectiveness of the seal, it is necessary to keep the pressure inside and outside the thin steel strip 101 balanced. When the pressure difference between the inside and outside spaces of the thin steel strip 101 is small enough, the sealing pressure requirement for the sealing strip will be correspondingly reduced to a level that does not affect the operation of the thin steel strip 101. Therefore, a pressure balance component is added between the steam pipe 104 connecting the internal distribution box 102 of the thin steel strip 101 and the evaporation pipe 106 connecting the outer wall of the thin steel strip 101 and the box body 100, so as to automatically adjust the pressure difference inside and outside the thin steel strip 101 in real time. For the specific working principle of the pressure balance component, please refer to Embodiment 2.

[0039] In summary, the thin steel strip 101 in the box body 100 of this device has a wavy bottom structure. Through the continuous operation of the thin steel strip 101, the waste liquid adheres to the surface of the thin steel strip 101 to form a thin water film, and exchanges heat with the high-temperature steam with an optimized flow path inside the thin steel strip 101, so as to continuously and quickly perform evaporation and concentration.

[0040] Embodiment 2, refer to Figure 1 、 Figure 10 and Figure 11 , which is the second embodiment of the present invention. Different from the previous embodiment, this embodiment provides a pressure balance component for the steel belt type falling film evaporation and concentration device, which solves the sealing problem between the edge of the thin steel strip 101 and the box body 100 during operation. It includes that a pressure balance component is arranged at the top of the box body 100, which includes a cylinder barrel 110. The two ends of the cylinder barrel 110 are hermetically provided with end covers 112. A piston 111 is hermetically and slidably connected inside the cylinder barrel 110, and steel pipes 113 are coaxially connected to both ends of the piston 111. The steel pipes 113 penetrate through the end covers 112 and are hermetically and slidably sleeved with the end covers 112. A sliding cover 114 is fixedly connected to the end of the steel pipe 113 far away from the piston 111, and a rotary joint 115 is also hermetically inserted into the end of the steel pipe 113 far away from the piston 111.

[0041] Specifically, the adapter pipe head 115 is in a Z shape, and the two ends of the adapter pipe head 115 are circular in shape. The middle section of the adapter pipe head 115 is rectangular. The interface at one end of the adapter pipe head 115 away from the piston 111 is vertically downward, and the interface at the other end of the adapter pipe head 115 is vertically upward. The middle section of the adapter pipe head 115 is horizontally arranged. The steel pipe 113 is connected to the top of the sliding cover 114, and the bottom surface of the sliding cover 114 fits and slides with the inner bottom surface of the adapter pipe head 115. The adapter pipe head 115 and the sliding cover 114 are symmetrically arranged on both sides of the box body 100. The bottom interfaces of the two groups of adapter pipe heads 115 are respectively connected to the first steam pipe 104 and the evaporation pipe 106. A notch 113a is provided on the peripheral wall of the steel pipe 113 connecting one end of the piston 111, and the notch 113a communicates with the adapter pipe head 115, the steel pipe 113 and the cylinder barrel 110.

[0042] Since both ends of the piston 111 in the cylinder barrel 110 are respectively connected to the first steam pipe and the evaporation pipe 106 through the steel pipe 113, the pressure of the high-temperature steam and the pressure formed during the evaporation of the high-salt wastewater directly act on both sides of the piston 111. When there is a pressure difference between these two pressures, the piston 111 will be pushed to move in the cylinder barrel 110. The movement of the piston 111 will drive the movement of the steel pipe 113, and the movement of the steel pipe 113 will drive the movement of the sliding cover 114. For example, when the pressure of the first steam pipe is relatively higher than that of the evaporation pipe 106, since the first steam pipe 104 is directly connected to the internal space of the thin steel belt 101, it can be considered that the internal space of the thin steel belt 101 is also pressurized accordingly. At this time, the piston 111 moves towards the evaporation pipe 106 under the action of the pressure difference, causing the sliding cover 114 in the adapter pipe head 115 connected to the evaporation pipe 106 to move towards the pipe orifice to cover part of the pipe orifice, thereby reducing the flow rate of the evaporation pipe 106 (or directly closing it to reduce the flow rate of the evaporation pipe 106 to zero). The evaporated gas cannot be discharged in time, causing the pressure between the outer wall of the thin steel belt 101 and the inner wall of the box body 100 to increase, thereby reducing the pressure difference between the first steam pipe and the evaporation pipe 106, that is, the pressure difference inside and outside the thin steel belt 101 is balanced in real time. When the pressure difference is very low, the sealing rubber strip 100b can meet the sealing requirements with a relatively low extrusion pressure, thereby reducing the friction between the sealing rubber strip 100b and the moving thin steel belt 101.

[0043] All other structures are the same as those in Embodiment 1.

[0044] In summary, the structure of the pressure balance component is very simple and easy to obtain, and it is an indispensable part for the normal operation of the present invention. By automatically adjusting to the state where the pressure difference fluctuates to balance based on the change of the pressure difference inside and outside the thin steel belt 101, the device can operate stably and smoothly.

[0045] Embodiment 3, referring to Figure 1 and Figure 2, which is the third embodiment of the present invention. Different from the previous embodiment, this embodiment provides an example of stacking the box body 100 of the steel belt type falling film evaporation concentration device. This device can conveniently increase or decrease the number of box bodies 100 to meet the production scale requirements of different sizes, greatly reducing the manufacturing costs of falling film evaporation concentration devices of different specifications, and being convenient for assembly, use, and maintenance.

[0046] The rest of the structures are the same as those in Embodiment 2.

[0047] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. 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 steel belt falling film evaporation concentration device, characterized in that: It comprises a horizontally arranged box (100), wherein a thin steel belt (101) is arranged in the box (100), the top of the thin steel belt (101) is horizontal, a scattering box (102) is sleeved in the thin steel belt (101) along its width direction, and the scattering boxes (102) are evenly distributed along the length direction of the thin steel belt (101), one end of the scattering box (102) is sealed and the other end is open, a scattering hole (102a) is opened on the side wall of the scattering box (102), and the open end of the scattering box (102) is sealed and fixedly plugged with the side wall of the box (100), the bottom of the thin steel belt (101) is arranged in a wave shape along the outer wall of the scattering box (102), and the thin steel belt (101) is sleeved with a rotating shaft (103) at the turning point, and the edge of the thin steel belt (101) is sealed and slidably connected to the inner wall of the box (100); A steam pipe 1 (104) is arranged on one side of the opening of the distribution box (102) outside the box (100), and a steam pipe 2 (105) and an evaporation pipe (106) are arranged on the other side of the box (100), the steam pipe 1 (104) and the steam pipe 2 (105) both penetrate the side wall of the box (100) and communicate with the inside of the distribution box (102), and the connection between the evaporation pipe (106) and the box (100) is located in the area formed by the outer wall of the thin steel strip (101) and the inner wall of the box (100); A pressure balancing assembly is provided at the top of the box body (100), comprising a cylinder (110), end covers (112) being sealed at both ends of the cylinder (110), a piston (111) being sealed and slidably connected inside the cylinder (110), and both ends of the piston (111) being coaxially connected to a steel pipe (113), the steel pipe (113) passing through the end cover (112) and being sealed and slidably sleeved with the end cover (112), one end of the steel pipe (113) away from the piston (111) passing through a sliding cover (114) being fixedly connected, and one end of the steel pipe (113) away from the piston (111) being sealed and plugged with a transfer pipe connector (115); The inner walls on both sides of the box body (100) are matched with the thin steel strip (101) to form a sliding groove (100a), the edge of the thin steel strip (101) is slidably connected to the sliding groove (100a), and sealing strips (100b) are provided on both sides of the edge of the thin steel strip (101) in the sliding groove (100a); The adapter pipe head (115) and the sliding cover (114) are symmetrically arranged on two sides of the box body (100); The bottom interfaces of the two sets of adapter pipe heads (115) are respectively connected to the steam pipe 1 (104) and the evaporation pipe (106).

2. The steel belt falling film evaporation concentration device according to claim 1, characterized in that: The box body (100) is rectangular in shape. The box bodies (100) are stacked in a vertical direction and connected in parallel. A feed pipe (107) and a discharge pipe (108) are respectively provided on both sides of the box body (100). The connection points between the feed pipe (107) and the discharge pipe (108) and the box body (100) are both located within the area formed by the outer wall of the thin steel strip (101) and the inner wall of the box body (100), and the discharge pipe (108) is connected to the bottom edge of the box body (100). Solenoid valves (109) are provided between the feed pipe (107) and the box body (100), and between the discharge pipe (108) and the box body (100).

3. The steel belt falling film evaporation concentration device according to claim 2, characterized in that: The angle between the top surface and one side of the distribution box (102) is ninety degrees, and the distribution holes (102a) are distributed on the vertical wall and the inclined wall of the distribution box (102).

4. The steel belt falling film evaporation concentration device according to claim 3, characterized in that: The adapter tube (115) is Z-shaped, and the interfaces at both ends of the adapter tube (115) are circular, the middle section of the adapter tube (115) is rectangular, and the interface at one end of the adapter tube (115) away from the piston (111) is vertically downward, the interface at the other end of the adapter tube (115) is vertically upward, and the middle section of the adapter tube (115) is arranged horizontally.

5. The steel belt falling film evaporation concentration device according to claim 4, characterized in that: The steel pipe (113) is connected to the top of the sliding cover (114), and the bottom surface of the sliding cover (114) slides in contact with the inner bottom surface of the adapter pipe head (115).

6. The steel belt falling film evaporation concentration device according to claim 5, characterized in that: A notch (113a) is formed on the peripheral wall of one end of the steel pipe (113) connected to the piston (111), and the notch (113a) is connected to the adapter pipe head (115), the steel pipe (113) and the cylinder barrel (110).

7. The steel belt falling film evaporation concentration device according to claim 6, characterized in that: An input shaft (103a) is arranged at one end of the rotating shaft (103) along its axial direction, and the input shaft (103a) extends outside the casing (100), and shaft seals (103b) are arranged between the input shaft (103a) and the inner wall and outer wall of the casing (100).

8. The steel belt falling film evaporation concentration device according to claim 7, characterized in that: A motor is provided at one end of the box body (100), and the output shaft and the input shaft (103a) of the motor are both provided with pulleys (103c), and the pulleys (103c) are connected by belts.

Images