Sewage and wastewater flash evaporation demister backwash device, flash evaporation sewage and wastewater treatment device and multi-effect flash evaporation sewage and wastewater treatment device

Abstract

The invention discloses a backwash device for a flash evaporation demister for wastewater, a flash evaporation wastewater treatment device and a multi-effect flash evaporation wastewater treatment device, which belong to the technical field of wastewater treatment. The present application can realize the extension and retraction of the telescopic flushing pipeline through the system's own power source without the need for external power components, thereby increasing the cleaning area of ​​the demister and improving the demisting efficiency. No new power components are needed, which reduces equipment investment, maintenance cycle and maintenance cost. The present application rotates the shell only when backwashing to cooperate with the telescopic cleaning main pipe to fully clean the demister, thereby greatly reducing the number of cleaning main pipes and the number of cleaning branch pipes. The reciprocating motion determines the number of cleaning branch pipes, and the rotation reduces the number of cleaning main pipes, thereby reducing the internal exhaust steam resistance and improving the heat exchange efficiency while improving the cleaning efficiency of the demister.

Description

Technical Field

[0001] The present invention belongs to the technical field of sewage and wastewater treatment, in particular to a sewage and wastewater flash evaporation demister backwashing device, a flash evaporation sewage and wastewater treatment device and a multi-effect flash evaporation sewage and wastewater treatment device. Background Art

[0002] In flash evaporation systems, widely used in the chemical and environmental fields, the demister is a key component. Its efficient operation is directly related to the separation efficiency and energy consumption of the system. The backwash system is a core maintenance component to ensure the proper functioning of the demister. Currently, existing flash evaporation systems are typically equipped with a backwash system for cleaning the demister.

[0003] Existing backwash systems suffer from numerous design flaws. First, improper flushing pipe layout can severely impact the flow of exhaust steam within the flash evaporator. Some systems employ a random or dense arrangement of flushing pipes. While this increases the cleaning coverage area, it significantly increases steam flow resistance, reduces exhaust steam removal efficiency, and consequently impacts the continuity and stability of the flash evaporation process. Second, the number of flushing pipes is poorly considered. Excessive flushing pipes not only occupy the limited space within the flash evaporator but also cause uneven flushing water distribution, reducing the effectiveness of demister surface cleaning and making it difficult to achieve the desired cleaning effect. Third, the flash evaporator is under vacuum. Traditional backwash systems rely on drive components such as motors to achieve directional flow and pressure supply of flushing water. However, in such negative pressure environments, the sealing requirements for these drive components are extremely stringent. If the seals fail, outside air can easily enter the device, disrupting the negative pressure balance and potentially posing a safety hazard. Furthermore, the installation and maintenance of the motors increase the system's complexity and operating costs.

[0004] In summary, the existing backwash system of the flash evaporation device has technical bottlenecks in balancing the demister cleaning effect and ensuring the fluidity of steam exhaust steam, and it is difficult to adapt to the special working conditions of vacuum negative pressure inside the device. An optimized backwash system design scheme is urgently needed to solve the above technical problems. Summary of the Invention

[0005] Purpose of the invention: To provide a flash evaporation demister backwash device for wastewater, a flash evaporation wastewater treatment device and a multi-effect flash evaporation wastewater treatment device to solve the above-mentioned problems existing in the prior art.

[0006] The evaporation nozzle of the water pump is fixed on the evaporation nozzle, and the evaporation nozzle is installed on the evaporation nozzle of the water pump to the evaporation nozzle.

[0007] Furthermore, the output end of the reducer is connected to the drive pipe through a coupling.

[0008] Furthermore, the telescopic flushing pipeline includes: a sealed shell, the sealed shell is installed on the rotating shell, a cleaning main pipe is slidably provided on the sealed shell, one end of the cleaning main pipe passes through the rotating shell and is connected to the eccentric wheel, a plurality of cleaning branch pipes are provided on the cleaning main pipe, a plurality of second through holes communicating with the sealed shell are provided on the cleaning main pipe, and a guide slope is provided on both the cleaning main pipe and the eccentric wheel.

[0009] Furthermore, an extended sealing tube is provided on the sealed shell, and the cleaning main pipe is placed in the extended sealing tube.

[0010] Furthermore, both ends of the cleaning main pipe are closed ends.

[0011] Furthermore, a ball bearing is obliquely provided at one end of the cleaning main pipe.

[0012] Furthermore, a limit ring and a second thrust spring are provided on the cleaning main pipe, and the second thrust spring is placed between the limit ring and the sealing shell.

[0013] Furthermore, when the sealing plate contacts the water outlet plate, the water outlet plate is placed at the first through hole and blocks it.

[0014] Furthermore, the connecting part includes: a base ring, which is mounted on the drive tube, and two half rings are installed on the base ring by bolts to form an L-shaped cavity, and a limiting ring with an L-shaped cross-section is provided on the sealing disk, and the L-shaped limiting ring is placed in the L-shaped cavity.

[0015] Furthermore, a driving tooth is axially slidably provided on the driving tube, and the driving tooth is connected to the eccentric wheel located below. A fixed inner gear ring is provided in the rotating shell, and the driving tooth is meshed with the fixed inner gear ring through an intermediate wheel.

[0016] Furthermore, the gear ring is slidably mounted on the drive tube, a third thrust spring is provided between the gear ring and the fixed base, fixed teeth are provided on the fixed inner gear ring, the fixed teeth are engaged with the gear ring, and a drive ring in contact with the gear ring is provided on the drive teeth.

[0017] Furthermore, a limiting column is provided on the fixed base, a through hole is provided on the gear ring, and the limiting column is placed in the through hole.

[0018] Furthermore, the third thrust spring is sleeved on the limiting column.

[0019] A flash evaporation wastewater treatment device comprises: a flash evaporation device and a heat exchange device for exchanging heat with steam exhaust generated by the flash evaporation device; a backwash device for cleaning a demister is provided on a slurry inlet pipe in the flash evaporation device.

[0020] Furthermore, the flash evaporation device and the heat exchange device are an integrated structure, and the exhaust steam generated by the flash evaporation device provides a heat source for the heat exchange device through a channel.

[0021] A multi-effect flash evaporation wastewater treatment device comprises a flash evaporation wastewater treatment device, wherein the flash evaporation device of the flash evaporation wastewater treatment device is connected to a plurality of flash evaporation components arranged in series and a heat exchange component paired with the flash evaporation components through a slurry discharge pipeline.

[0022] Furthermore, the flash evaporation assembly has the same structure as the flash evaporation device.

[0023] Furthermore, the heat exchange assembly has the same structure as the heat exchange device.

[0024] Furthermore, the heat exchange tubes of the heat exchange assembly and the heat exchange tubes of the heat exchange device are sequentially connected in series. Beneficial effects

[0025] This application can achieve the extension and retraction of the telescopic flushing pipeline through the system's own power source without the need for additional external power components, thereby increasing the cleaning area of ​​the defogger and improving the defogger efficiency. There are no new power components, which reduces equipment investment, maintenance cycles and maintenance costs.

[0026] The present application provides a guiding inclined surface to make the contact process between the eccentric wheel and the ball smooth, and cooperates with the second thrust spring to achieve continuous reciprocating motion, thereby achieving efficient cleaning of the defogger.

[0027] In this application, the rotating shell only rotates during backwashing and cooperates with the telescopic cleaning main pipe to fully clean the demister, thereby greatly reducing the number of cleaning main pipes and the number of cleaning branch pipes. The reciprocating motion determines the number of cleaning branch pipes, and the rotation reduces the number of cleaning main pipes. Therefore, while improving the cleaning efficiency of the demister, the internal exhaust steam resistance is reduced and the heat exchange efficiency is improved.

[0028] This application can reduce the instantaneous spray volume of the system by reducing the number of backwash nozzles, thereby adapting to the situation of insufficient spray water flow, while reducing the impact on the flash evaporation environment inside the flash evaporation unit, and further improving the flash evaporation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a perspective view of the multi-effect flash evaporation wastewater treatment device of the present invention;

[0030] Figure 2 is a perspective view of a flash evaporation wastewater treatment device according to the present invention;

[0031] Figure 3 It is a structural schematic diagram of the flash evaporation wastewater treatment device of the present invention;

[0032] Figure 4 Schematic diagram of the structure of the backwash device of the flash evaporation demister for wastewater of the present invention;

[0033] Figure 5 This invention Figure 4 A partial enlarged view of middle A;

[0034] Figure 6 This invention Figure 4 A partial enlarged view of B. DETAILED DESCRIPTION

[0035] In the following description, numerous specific details are provided to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention may be practiced without one or more of these details. In other instances, certain technical features well known in the art are not described to avoid confusion with the present invention.

[0036] Combined with attachment Figure 1 -Attached Figure 6As shown: A backwash device for a flash evaporation mist eliminator for sewage and wastewater, the backwash device 11 is connected to the blades 14 in the slurry inlet pipe 13 through a reducer 12, the backwash device 11 comprises: a fixed base 111, a rotating shell 112 is provided on the fixed base 111, at least one telescopic flushing pipeline 113 is provided on the rotating shell 112, a water inlet pipe 114 and a drive pipe 115 are coaxially provided on the rotating shell 112, the outlet of the water inlet pipe 114 is placed in the drive pipe 115, the drive pipe 115 is provided with a water outlet tray 116, and the drive pipe 115 is provided with two corresponding For the stationary sealing disk 117 of the rotating shell 112, the two sealing disks 117 are located on both sides of the water outlet disk 116 and form a driving cavity. The rotating shell 112 is provided with a first through hole 119 for connecting the telescopic flushing pipeline 113 and the driving cavity. The driving tube 115 is provided with an eccentric wheel 118 for driving the telescopic flushing pipeline 113 to achieve telescopic expansion. The eccentric wheel 118 and the sealing disk 117 are axially limited by a connecting piece 120. The driving tube 115 is provided with a first thrust spring 121 for squeezing the eccentric wheel 118 to move toward the water outlet disk 116.

[0037] The backwash device 11 is detachably connected to the reducer 12. The reducer 12 can be mounted directly on the slurry inlet pipe 13, through a bracket, or inside the flash evaporator housing, and is connected to the blades 14 via a transmission mechanism. The reducer 12 can preferably be a planetary gear reducer, or other reducers suitable for the installation environment. The blades 14 are mounted in the slurry inlet pipe 13 via a rotating shaft to capture the kinetic energy of the slurry medium during flow, without the need for a separate power source. One end of the fixed base 111 is connected to the housing flange of the reducer 12 for fixing. A drive tube 115 is rotatably mounted on the fixed base 111. The drive tube 115 is rotationally limited to one end of the drive tube 115 by a bearing and an end pressure ring. The other end of the drive tube 115 is coaxially matched with the water inlet pipe 114. The water inlet pipe 114 is mounted on the rotating shell 112 through a bearing seat. The water inlet pipe 114 is connected to the backwash main pipe, which is fixedly mounted inside the shell of the flash evaporator. The rotating shell 112 can rotate relative to the fixed base 111. However, separation, i.e. axial separation, cannot occur. A rotating sealing ring is provided between the rotating shell 112 and the fixed base 111 to prevent external slurry from entering the interior and causing damage to the internal structure. The outlet of the water inlet pipe 114 is placed in the driving pipe 115. A rotating seal is provided between the water inlet pipe 114 and the driving pipe 115 to prevent backwash water from flowing out from the gap between the two. The water outlet tray 116 has a disc-shaped structure. The water outlet tray 116 is fixedly mounted on the driving pipe 115 and can be locked and sealed by bolts. It can also be formed as one piece with the driving pipe 115. 6 is provided with multiple water outlets on the edge and multiple water channels are provided inside the water channel, which is connected to the inside of the driving pipe 115 and then connected to the water inlet pipe 114. The water outlet disc 116 also serves to isolate the two sealing discs 117, providing a position for the backwash water to enter the driving cavity between the two sealing discs 117, and preventing the two sealing discs 117 from being tightly fitted and unable to be separated. The driving cavity serves as the power center for opening and closing the entire telescopic flushing pipeline 113. At the same time, the backwash water in the driving cavity enters the telescopic flushing pipeline 113 through the first through hole 119 to provide a power source for it, thereby enabling it to be opened and closed. The reciprocating motion of the eccentric wheel 118 is achieved by moving the sealing disc 117 to drive it to achieve the separation action, and the second is to achieve the reset action through the first thrust spring 121. The edge of the sealing disc 117 cooperates with the inside of the rotating shell 112 to limit the rotation of the sealing disc 117, so that the sealing disc 117 can slide on the driving tube 115 and thus drive the eccentric wheel 118 to move. It should be noted that the backwash water can be used as the power source for the reciprocating motion of the telescopic flushing pipeline 113 on the basis of its ability to clean the demister, and no additional driving components such as a telescopic motor are required.This effectively prevents the problem of electrical components having a short service life in a vacuum environment while reducing dependence on the installation environment. The eccentric wheel 118 is provided with a guide slope to facilitate cooperation with the telescopic flushing pipe 113. At the same time, the sealing disc 117 can be used to block the first through hole 119, preventing the drive chamber inside the rotating housing 112 from being in a continuous negative pressure state. This effectively prevents the sealing disc 117 from squeezing the water outlet disc 116, causing it to deform and affect the sealing effect, and prevents the backwash water from slowly and continuously entering the flash chamber due to the valve on the backwash main pipe being not closed tightly, thereby affecting the flash evaporation efficiency.

[0038] Working principle: backwash water enters the drive pipe 115 through the water inlet pipe 114 and flows through the water outlet plate 116 into the drive chamber, and then enters the telescopic flushing pipeline 113 through the first through hole 119 by the driver to realize the discharge of backwash water. In this process, since the backwash water inlet volume is greater than the discharge volume, the two sealing plates 117 are driven away from the water outlet plate 116 by the water pressure of the backwash water. After reaching the limit, the eccentric wheel 118 cooperates with the input end of the telescopic flushing pipeline 113 to realize the intervention of the power source of the telescopic flushing pipeline 113. Due to the continuous rotation of the eccentric wheel 118, the telescopic flushing pipeline 113 is driven to retract.

[0039] The present application can realize the extension and retraction of the telescopic flushing pipeline 113 through the system's own power source without adding any external power components, thereby increasing the cleaning area of ​​the defogger and improving the defogger efficiency. There is no need to add any new power components, reducing equipment investment, and reducing maintenance cycles and maintenance costs.

[0040] The output end of the reducer 12 is connected to the drive tube 115 through a coupling 15. In this arrangement, the coupling 15 is preferably a straight coupling to facilitate docking with the reducer 12 and reduce installation difficulty.

[0041] The telescopic flushing pipeline 113 includes a sealed housing 1131, which is mounted on the rotating housing 112. A cleaning main pipe 1132 is slidably mounted on the sealed housing 1131. One end of the cleaning main pipe 1132 passes through the rotating housing 112 and is connected to the eccentric wheel 118. The cleaning main pipe 1132 is provided with multiple cleaning branch pipes 1133. The cleaning main pipe 1132 is provided with multiple second through holes 1134 that communicate with the sealed housing 1131. An extended sealing pipe 1135 is provided on the sealed housing 1131, and the cleaning main pipe 1132 is placed within the extended sealing pipe 1135. Both ends of the cleaning main pipe 1132 are closed. The cleaning main pipe 1132 and the eccentric wheel 118 are both provided with guiding inclined surfaces 1139. A ball bearing 1136 is tiltedly mounted on one end of the cleaning main pipe 1132. The main cleaning pipe 1132 is provided with a limit ring 1137 and a second thrust spring 1138, and the second thrust spring 1138 is placed between the limit ring 1137 and the sealing housing 1131. When the sealing plate 117 contacts the water outlet tray 116, the water outlet tray 116 is placed on the first through hole 119 and blocks it.

[0042] The sealing shell 1131 is installed on the outer wall of the rotating shell 112, with a sealing ring or a sealing gasket arranged therebetween. The sealing shell 1131 is provided with at least one cleaning branch pipe 1133, the cleaning branch pipe 1133 is communicated with the sealing shell 1131, the cleaning branch pipe 1133 is vertically arranged on the sealing shell 1131 or on the cleaning main pipe 1132, the cleaning branch pipe 1133 is arranged at an angle on the sealing shell 1131 or on the cleaning main pipe 1132, the specific angle and each angle are determined according to actual conditions; the cleaning branch pipe 1133 and the sealing shell 1131 or the cleaning main pipe 1132 are fixedly connected or detachably connected, that is, integrally formed or welded, connected by bolts or threads; both ends of the cleaning main pipe 1132 can be blocked with a plug, one of the plugs is embedded with a ball 1136, and the position of the second through hole 1134 ensures that the cleaning main pipe 1132 is still placed in the sealing shell 1131 or extends the sealing pipe 1132 when it is extended to the limit position. 5, a sealing ring is provided in the extended sealing tube 1135, and the position of the limiting ring 1137 requires that when the cleaning main pipe 1132 is in the contraction limit position, that is, when the ball 1136 contacts the minimum diameter point of the eccentric wheel 118, the limiting ring 1137 contacts the outer arm of the sealing shell 1131, and the second thrust spring 1138 can be provided with a waterproof sleeve to prevent scaling caused by long-term contact with backwash water. The second thrust spring 1138 allows the cleaning main pipe 1132 to receive a sustained pressure. The inner movement trend continues, and the eccentric wheel is cooperated to realize outward drive and thus reciprocating motion; the ball 1136 is tiltedly arranged on the guide slope 1139 of the cleaning main pipe 1132 and contacts and cooperates with the guide slope 1139 on the eccentric wheel 118. At the same time, the guide slope 1139 of the cleaning main pipe 1132 contacts and cooperates with the guide slope 1139 on the eccentric wheel 118 to guide the ball 1136 to the specified position. Other balls can be set on the guide slope 1139 to reduce friction.

[0043] Working process: When the eccentric wheel 118 is separated, since the eccentric wheel 118 keeps rotating at all times, when it contacts the end of the cleaning main pipe 1132, the guiding inclined surfaces 1139 of the two are first in contact, and at the same time, the cleaning main pipe 1132 is squeezed, and then the ball 1136 contacts the guiding inclined surface 1139 of the eccentric wheel 118. Finally, the eccentric wheel 118 reaches the limit position and continuously contacts and cooperates with the ball 1136. The limit position of the eccentric wheel 118 can be achieved by setting a limiting portion on the driving tube 115.

[0044] The present application provides a guiding slope 1139 to make the contact process between the eccentric wheel 118 and the ball 1136 smooth, and cooperates with the second thrust spring 1138 to achieve continuous reciprocating motion, thereby achieving efficient cleaning of the defogger 18.

[0045] The connecting member 120 includes: a base ring 1201, the base ring 1201 is mounted on the driving tube 115, two half rings 1202 are installed on the base ring 1201 by bolts to form an L-shaped cavity 1203, and a limiting ring 1204 with an L-shaped cross section is provided on the sealing disk 117, and the L-shaped limiting ring 1204 is placed in the L-shaped cavity 1203.

[0046] Among them, the base ring 1201 is fixedly installed on the eccentric wheel 118, and the two half rings 1202 are installed on the base ring 1201 by bolts. The two half rings 1202 cooperate with the base ring 1201 to form an L-shaped cavity 1203 with a cross section. The L-shaped cavity 1203 cooperates with the L-shaped limiting ring 1204 to achieve axial traction and axial freedom. The L-shaped limiting ring 1204 can be welded or bolted to the sealing disk 117. A vertical groove can be provided on the rotating shell 112, and a protrusion is provided on the edge of the sealing disk 117. The two cooperate to limit the circumferential position of the sealing disk 117.

[0047] Working process: When the driving tube 115 rotates, it drives the eccentric wheel 118 to rotate, and the eccentric wheel 118 drives the base ring 1201 and the half ring 1202 to rotate, thereby realizing the rotation of the L-shaped cavity 1203. At this time, the L-shaped cavity 1203 and the L-shaped limiting ring 1204 rotate relative to each other. When the sealing disk 117 separates, it drives the L-shaped limiting ring 1204 to move axially and then drives the eccentric wheel 118 to move axially.

[0048] The present application ensures that the axial movement of the sealing disk 117 can drive the axial movement of the eccentric wheel 118 in a rotating state through the connecting piece 120.

[0049] A drive tooth 122 is axially slidably mounted on the drive tube 115. The drive tooth 122 is connected to the eccentric wheel 118 located below. A fixed inner ring gear 123 is disposed within the rotating housing 112. The drive tooth 122 and the fixed inner ring gear 123 mesh with each other via an intermediate wheel 129, which is mounted on the fixed base 111 via a limiting post 128. A gear ring 124 is slidably mounted on the drive tube 115. A third thrust spring 125 is disposed between the gear ring 124 and the fixed base 111. Fixed teeth 126 are mounted on the fixed inner ring gear 123, which mesh with the gear ring 124. A drive ring 127 is mounted on the drive tooth 122, which contacts the gear ring 124. A limiting post 128 is disposed on the fixed base 111. The gear ring 124 is provided with a through hole, and the limiting post 128 is positioned within the through hole. The third thrust spring 125 is sleeved on the limiting column 128 .

[0050] Among them, the driving tooth 122 is fixedly connected to the eccentric wheel 118. In the non-backwash state, the gear ring 124 is engaged with the fixed tooth 126, thereby limiting the rotating shell 112 to be stationary relative to the fixed base 111. When in the backwash state, the driving tooth 122 moves downward to drive the driving ring 127 to move, and then drives the gear ring 124 to move downward along the limiting column 128 to compress the third thrust spring 125, thereby separating the gear ring 124 from the fixed tooth 126. At the same time, the driving tooth 122 is engaged with the fixed inner ring gear 123 through the intermediate wheel 129. When the driving tooth 122 rotates, it drives the rotating shell 112 to rotate.

[0051] In the present application, the rotating shell 112 rotates only during backwashing to cooperate with the telescopic cleaning main pipe 1132 to fully clean the demister, thereby greatly reducing the number of cleaning main pipes 1132 and the number of cleaning branch pipes 1133. The reciprocating motion determines the number of cleaning branch pipes 1133, and the rotation reduces the number of cleaning main pipes 1132. Therefore, while improving the cleaning efficiency of the demister, the internal exhaust steam resistance is reduced and the heat exchange efficiency is improved.

[0052] A flash evaporation wastewater treatment device includes: a flash evaporation device 16 and a heat exchange device 17 for exchanging heat with the steam exhaust generated by the flash evaporation device 16. A backwash device 11 for cleaning the demister 18 is provided on the slurry inlet pipe 13 in the flash evaporation device 16.

[0053] The flash evaporation device 16 and the heat exchange device 17 are an integrated structure, and the exhaust steam generated by the flash evaporation device 16 provides a heat source for the heat exchange device 17 through a channel.

[0054] A multi-effect flash evaporation wastewater treatment device includes a flash evaporation wastewater treatment device, wherein a flash evaporation device 16 of the flash evaporation wastewater treatment device is connected to a plurality of flash evaporation modules 19 and heat exchange modules 20 paired with the flash evaporation modules 19 via a slurry discharge pipeline. The flash evaporation modules 19 have the same structure as the flash evaporation device 16. The heat exchange modules 20 have the same structure as the heat exchange module 17. The heat exchange tubes of the heat exchange modules 20 are sequentially connected in series with the heat exchange tubes of the heat exchange module 17.

[0055] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and these equivalent transformations all fall within the scope of protection of the present invention.

Claims

1. A backwash device for a flash evaporation demister for wastewater, wherein the backwash device (11) is connected to blades (14) in a slurry inlet pipe (13) via a speed reducer (12), and is characterized in that: The backwashing device (11) comprises: a fixed base (111), a rotating shell (112) is provided on the fixed base (111), at least one telescopic flushing pipeline (113) is provided on the rotating shell (112), a water inlet pipe (114) and a drive pipe (115) are coaxially provided on the rotating shell (112), the outlet of the water inlet pipe (114) is placed in the drive pipe (115), a water outlet disc (116) is provided on the drive pipe (115), and two sealing discs (117) are mounted on the drive pipe (115) and are stationary relative to the rotating shell (112). The sealing disc (117) is located on both sides of the water outlet disc (116) and forms a driving cavity. The rotating shell (112) is provided with a first through hole (119) for connecting the telescopic flushing pipeline (113) and the driving cavity. The driving tube (115) is provided with an eccentric wheel (118) for driving the telescopic flushing pipeline (113) to achieve telescopic movement. The eccentric wheel (118) and the sealing disc (117) are axially limited by a connecting piece (120). The driving tube (115) is provided with a first thrust spring (121) for pressing the eccentric wheel (118) to move toward the water outlet disc (116).

2. The backwash device for flash evaporation mist remover of sewage and wastewater according to claim 1, characterized in that: The output end of the reducer (12) is connected to the drive tube (115) via a coupling (15).

3. The backwash device for flash evaporation demister of wastewater according to claim 2, characterized in that: The telescopic flushing pipeline (113) comprises a sealing shell (1131), the sealing shell (1131) being mounted on the rotating shell (112), a main cleaning pipe (1132) being slidably disposed on the sealing shell (1131), one end of the main cleaning pipe (1132) passing through the rotating shell (112) and connected to the eccentric wheel (118), a plurality of branch cleaning pipes (1133) being disposed on the main cleaning pipe (1132), a plurality of second through holes (1134) being disposed on the main cleaning pipe (1132) being in communication with the sealing shell (1131), and a guiding inclined surface (1139) being disposed on both the main cleaning pipe (1132) and the eccentric wheel (118).

4. The backwash device for flash evaporation demister of wastewater according to claim 3 is characterized in that: An extended sealing tube (1135) is provided on the sealing shell (1131), and the cleaning main pipe (1132) is placed in the extended sealing tube (1135).

5. The backwash device for flash evaporation demister of wastewater according to claim 3, characterized in that: Both ends of the cleaning main pipe (1132) are closed ends.

6. The backwash device for flash evaporation demister of wastewater according to claim 3, characterized in that: A ball bearing (1136) is obliquely provided at one end of the cleaning main pipe (1132).

7. The backwash device for flash evaporation demister of wastewater according to claim 3, characterized in that: A limit ring (1137) and a second thrust spring (1138) are provided on the cleaning main pipe (1132), and the second thrust spring (1138) is placed between the limit ring (1137) and the sealing shell (1131).

8. The backwashing device for flash evaporation mist remover of sewage and wastewater according to claim 1, characterized in that: When the sealing disc (117) contacts the water outlet disc (116), the water outlet disc (116) is placed at the first through hole (119) and blocks it.

9. The backwash device for flash evaporation demister of wastewater according to claim 1, characterized in that: The connecting member (120) comprises: a base ring (1201), the base ring (1201) is sleeved on the driving tube (115), two half rings (1202) are mounted on the base ring (1201) by bolts to form an L-shaped cavity (1203), and a limiting ring (1204) with an L-shaped cross section is provided on the sealing disk (117), and the L-shaped limiting ring (1204) is placed in the L-shaped cavity (1203).

10. The backwashing device for flash evaporation demister of wastewater according to claim 1, characterized in that: A driving tooth (122) is axially slidably provided on the driving tube (115), and the driving tooth (122) is connected to the eccentric wheel (118) located below. A fixed inner gear ring (123) is provided in the rotating housing (112), and the driving tooth (122) is meshed with the fixed inner gear ring (123) through an intermediate wheel (129).

11. The backwashing device for flash evaporation mist remover of sewage and wastewater according to claim 10, characterized in that: The gear ring (124) is slidably mounted on the driving tube (115); a third thrust spring (125) is provided between the gear ring (124) and the fixed base (111); a fixed tooth (126) is provided on the fixed inner gear ring (123); the fixed tooth (126) is engaged with the gear ring (124); and a driving ring (127) in contact with the gear ring (124) is provided on the driving tooth (122).

12. The backwashing device for flash evaporation demister of wastewater according to claim 11, characterized in that: A limiting column (128) is provided on the fixed base (111), a through hole is provided on the gear ring (124), and the limiting column (128) is placed in the through hole.

13. The backwashing device for flash evaporation mist remover of wastewater according to claim 12, characterized in that: The third thrust spring (125) is sleeved on the limiting column (128).

14. A flash evaporation wastewater treatment device comprising: The backwashing device (11), the flash evaporation device (16), and the heat exchange device (17) for exchanging heat with exhaust steam generated by the flash evaporation device (16) according to any one of claims 1 to 13, characterized in that a backwashing device (11) for cleaning a demister (18) is provided on the slurry inlet pipe (13) in the flash evaporation device (16).

15. The flash evaporation wastewater treatment device according to claim 14, characterized in that: The flash evaporation device (16) and the heat exchange device (17) are an integrated structure, and the exhaust steam generated by the flash evaporation device (16) provides a heat source for the heat exchange device (17) through a channel.

16. A multi-effect flash evaporation wastewater treatment device, characterized in that: The flash evaporation wastewater treatment device comprises the flash evaporation wastewater treatment device of claim 14, wherein the flash evaporation device (16) of the flash evaporation wastewater treatment device is connected to a plurality of flash evaporation components (19) arranged in series and a heat exchange component (20) paired with the flash evaporation component (19) through a slurry discharge pipeline.

17. The multi-effect flash evaporation wastewater treatment device according to claim 16, characterized in that: The flash evaporation assembly (19) has the same structure as the flash evaporation device (16).

18. The multi-effect flash evaporation wastewater treatment device according to claim 16, characterized in that: The heat exchange assembly (20) has the same structure as the heat exchange device (17).

19. The multi-effect flash evaporation wastewater treatment device according to claim 18, characterized in that: The heat exchange tubes of the heat exchange assembly (20) and the heat exchange tubes of the heat exchange device (17) are sequentially connected in series.

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