Industrial multi-stage wastewater purification treatment device

Abstract

The present application relates to a kind of industrial multistage wastewater purification treatment device, it is related to wastewater purification treatment technical field, the present application includes multistage evaporator, multistage evaporator includes jar body and transfusion pipe, the top of jar body is equipped with input cylinder, input cylinder is communicated with the inner chamber of jar body by the input port of its lower part, transfusion pipe includes at least one input pipe that is accessed tangentially along the inner wall of input cylinder, input pipe is tapered along feed direction, by the cooperation of tangentially tapered input pipe with guide liquid tongue with shunt hole in end, waste water is entered jar body in high speed, split beam, wall-adhering cyclone state, and cooperates with helical guide plate and its downward end redistribution ring along liquid flow path, so that the continuous cyclone scouring and complete liquid film cover are formed in evaporation inner wall, the problems that the existing radial feed flow direction disperses, wall surface is prone to form stagnation zone and dry wall, high salt supersaturated feed liquid is salted out and causes heat exchange efficiency to attenuate on wall surface and leads to frequent shutdown cleaning are solved.

Description

Technical Field

[0001] This invention relates to the field of wastewater purification and treatment technology, specifically to an industrial multi-stage wastewater purification and treatment device. Background Technology

[0002] High-salt wastewater and heavy metal-containing wastewater generated in industrial production are usually treated by multi-stage evaporation purification devices for volume reduction and resource recovery. Existing multi-stage evaporation purification devices generally include a feed pipeline, at least two evaporators connected in sequence, a steam compression or heating mechanism, and a circulation pump. After the wastewater to be treated is fed in through the feed pipeline, it circulates between the heat exchange chamber and the separation chamber under the drive of the circulation pump. The heat exchange chamber heats the wastewater to evaporate the water. The generated secondary steam is compressed and reused or used as a heat source for the subsequent evaporator. The salt and heavy metals in the wastewater crystallize out as the feed liquid is concentrated at each stage, thereby achieving multi-stage purification of industrial wastewater. The feed pipeline of the existing device is usually connected radially to the separation chamber. After the feed liquid enters the separation chamber, it rushes directly into its interior and disperses, and then flows down the wall by gravity and circulation.

[0003] However, in actual operation, existing multi-stage evaporation purification devices often result in dispersed flow of the liquid after it enters the separation chamber via a radial feed pipe. This makes it difficult to form a uniform and continuous downward liquid film on the separation chamber wall, leading to the formation of low-velocity stagnant zones near the wall and even localized dry wall phenomena where the liquid film breaks down. Furthermore, industrial wastewater remains in a high-salt, supersaturated state throughout the staged evaporation and concentration process. Salt crystals easily precipitate in the aforementioned stagnant zones and dry walls, adhering to the wall surface and forming a scale layer. This scale layer has a low thermal conductivity and high thermal resistance, causing a continuous decline in heat exchange efficiency and device processing capacity. This necessitates frequent shutdowns for cleaning, resulting in poor continuity and stability of equipment operation.

[0004] To address the aforementioned technical deficiencies, a solution is proposed. Summary of the Invention

[0005] This invention provides an industrial multi-stage wastewater purification treatment device that solves the problems of dispersed radial feed flow, easy formation of stagnant zones and dry walls on the wall, salt precipitation and scaling of high-salt supersaturated liquid on the wall leading to reduced heat exchange efficiency, and the need for frequent shutdowns for cleaning.

[0006] To achieve the goal of forming a continuous swirling scouring and complete liquid film coverage on the inner wall of the evaporator to reduce the structure, the present invention is achieved through the following technical solution: an industrial multi-stage wastewater purification treatment device, including a multi-stage evaporator, wherein the multi-stage evaporator includes a tank and a liquid delivery pipe, the top of the tank is provided with an input cylinder, and the input cylinder is connected to the inner cavity of the tank through its lower input port; The infusion tube includes at least one infusion tube that is tangentially connected to the inner wall of the infusion cylinder. The infusion tube gradually narrows along the feeding direction, and one end of the tube that extends into the infusion cylinder is provided with a liquid guide tongue. The liquid guide tongue is provided with a plurality of diversion holes spaced apart. The inner wall of the tank is provided with a spiral guide plate, the inner edge of the spiral guide plate is provided with a limiting protrusion, and the top of the limiting protrusion is provided with a chamfer. The inner wall of the tank is provided with an annular redistribution ring at the downward end of the spiral guide plate. The redistribution ring includes a liquid collection tank and an upper inclined surface and a lower inclined surface respectively provided on both sides of the liquid collection tank. The upper inclined surface is provided with a plurality of drainage grooves. The tank body is also equipped with a vortex-eliminating component coaxially suspended by a mounting rod. The vortex-eliminating component includes an inverted cone located at the top and a cross grid frame connected below the inverted cone. The inverted cone is positioned below the inlet with the large end at the top and the small end at the bottom.

[0007] Furthermore, the input pipe is provided with two pipes, which are symmetrically arranged around the circumference of the input cylinder and are tangentially connected to the inner wall of the input cylinder. The cross-section of the input pipe gradually shrinks into a flat shape along the feeding direction.

[0008] Furthermore, the liquid guide tongue extends obliquely from the end of the input pipe toward the inner wall of the input cylinder, and a plurality of the diversion holes are arranged at intervals along the length direction of the liquid guide tongue, and the holes of the diversion holes are inclined toward the inner wall of the input cylinder, for the purpose of diverting the liquid flow into bundles and guiding them toward the inner wall of the input cylinder.

[0009] Furthermore, the spiral guide plate spirals downwards from the upper part of the tank along the inner wall, and its surface is inclined towards the inner wall of the tank with the outer side lower and the inner side higher in the radial section; the limiting protrusion flips up from the inner edge of the spiral guide plate, and the chamfer is a smooth inner chamfer at the top of the limiting protrusion.

[0010] Furthermore, the redistribution ring is arranged around the entire inner wall of the tank, the liquid collection tank receives the liquid from the end of the spiral guide plate, several of the diversion channels are evenly distributed along the circumference of the upper inclined surface, and the lower inclined surface is arranged to fit the inner wall of the tank, so that after the liquid in the liquid collection tank is evenly distributed along the circumference, it forms a uniform annular descending liquid film on the tank wall through the lower inclined surface.

[0011] Furthermore, the inverted cone is a hollow cone with several pressure-stabilizing holes spaced apart on the peripheral wall of its upper large end. The pressure-stabilizing holes are located in the gas phase region above the gas-liquid interface inside the tank. The cone wall of the inverted cone is provided with liquid guiding ribs, and the lower small end of the inverted cone is fixedly connected to the cross grid frame.

[0012] Furthermore, each of the four ends of the cross grid is fixedly provided with a grid plate, and the upper and lower ends of the grid plate are provided with a second drag-reducing end, and the upper end of the cross grid is provided with a first drag-reducing end.

[0013] Furthermore, each of the four ends of the cross grid is fixedly mounted with a counterweight by a mounting block. The counterweight keeps the anti-vortex assembly coaxially tensioned and restricts its radial swing. The upper end of the mounting block is provided with a drag-reducing end three.

[0014] Furthermore, the liquid falling onto the conical surface of the inverted cone is guided to the cross grid via the liquid guiding ribs, and the spiral direction of the liquid guiding ribs is consistent with the spiral direction of the swirling guide plate.

[0015] Furthermore, multiple sets of spiral guide plates and redistribution rings are alternately arranged along the axial direction of the tank to form a multi-stage liquid film relay.

[0016] The present invention has the following beneficial effects: (1) The industrial multi-stage wastewater purification treatment device uses a tangentially tapering input pipe and a liquid guide tongue with a diversion hole at the end to make the wastewater enter the tank in a high-speed, bundled, and wall-adhering swirling state. It works in conjunction with the spiral guide plate with a lower outer side and a higher inner side on the inner wall and the redistribution ring at the lower end along the liquid flow path. After the liquid flows down the spiral guide plate along the wall, it flows into the collection tank and is evenly distributed around the circumference through the diversion channel. Then, a continuous and uniform annular descending liquid film is reconstructed on the tank wall by the lower inclined surface, thereby forming a continuous swirling scouring and complete liquid film coverage on the inner wall of the evaporator, which prolongs the continuous operation cycle of the device.

[0017] (2) A de-vortex assembly consisting of an inverted cone and a cross grid is coaxially suspended at the center of the tank by an installation rod. The pressure stabilizing hole in the upper gas phase zone of the inverted cone balances the pressure of the central gas core. The liquid guiding ribs in the same direction as the spiral guide plate smoothly guide the residual liquid into the grid. With the help of the drag reduction end and end counterweight of the grid plate, the external wall-adhering vortex and the central stable gas core are both independent and connected to each other. Without weakening the wall vortex, the gas core oscillation and circulating pump cavitation are suppressed. Combined with the multi-stage relay of the spiral guide plate and the redistribution ring along the axial direction, and the two input pipes with opposite tangential directions are switched by the reversing valve in time, under normal working conditions, the feed is fed in the forward direction and the vortex direction is consistent with the spiral guide plate, so the film evaporation is smooth. During periodic backwashing, the feed is fed in the reverse direction and the turbulent shearing is formed by the blocking of the fixed spiral guide plate and the limiting protrusion to peel off the initial scale layer online. Overall, the stability, working condition adaptability and long-term operation reliability of the multi-stage evaporation purification are improved.

[0018] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure of the input tube tangentially positioned at both ends of the input cylinder according to the present invention; Figure 3 This is a schematic diagram of the structure in which the input tube and the input cylinder are fixedly connected according to the present invention; Figure 4 This is a schematic diagram of the structure of the present invention, in which an input tube is provided inside the input port; Figure 5 This is a schematic diagram of the input tube portion of the present invention; Figure 6 for Figure 5 Enlarged structural diagram at point A; Figure 7 A schematic diagram of the structure of the tank body of the present invention having a redistribution ring fixedly disposed on the inner wall of the tank body; Figure 8 This is a schematic cross-sectional view of the redistribution ring portion of the present invention; Figure 9 for Figure 8 Enlarged structural diagram at point B; Figure 10 This is a schematic diagram of the structure of the present invention, in which the redistribution ring is disposed between the spiral guide plates; Figure 11 for Figure 10 Enlarged structural diagram at point C; Figure 12 This is a schematic diagram of the structure of the grid plate of the present invention being fixedly installed on the cross grid frame.

[0020] In the diagram: 1. Multistage evaporator; 101. Inlet pipe; 1011. Inlet pipe; 1012. Liquid guide tongue; 1013. Diverter orifice; 102. Tank body; 1021. Inlet cylinder; 1022. Inlet port; 2. Mounting rod; 201. Inverted cone cylinder; 2011. Pressure stabilizing hole; 2012. Liquid guide ridge; 202. Cross grid; 2021. Drag reduction end one; 2022. Grid plate; 2023. Drag reduction end two; 2024. Mounting block; 2025. Drag reduction end three; 2026. Counterweight block; 3. Spiral guide plate; 301. Limiting protrusion; 3011. Chamfer; 4. Redistribution ring; 401. Liquid collection tank; 402. Upper inclined surface; 4021. Drainage channel; 403. Lower inclined surface. Detailed Implementation

[0021] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0022] In the description of this invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around", etc., which indicate orientation or positional relationship, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention.

[0023] Please see Figures 1-12 This invention provides a technical solution: an industrial multi-stage wastewater purification device includes a multi-stage evaporator 1. The multi-stage evaporator 1 includes a vertical tank 102 and a delivery pipe 101. An input cylinder 1021 is coaxially fixed to the top end cap of the tank 102. The input cylinder 1021 is a cylinder with a closed upper end and an open lower end. Its lower end is connected to the inner cavity of the tank 102 through an input port 1022. The delivery pipe 101 includes two input pipes 1011, which are symmetrically arranged circumferentially along the input cylinder 1021 and are divided into two sections. The input pipe 1011 is tangentially connected to the inner wall of the input cylinder 1021 and welded to the opening of the side wall of the input cylinder. The other end of the input pipe 1011 is connected to the feed and external circulation pipeline. The cross section of the input pipe 1011 gradually shrinks into a flat shape along the feed direction. A liquid guide tongue 1012 is fixed on the inner wall of the end of the input cylinder 1021. The liquid guide tongue 1012 extends obliquely from the pipe end toward the inner wall of the input cylinder 1021. Several diversion holes 1013 are spaced apart on the liquid guide tongue 1012 along its length direction. The holes of the diversion holes 1013 are inclined toward the inner wall of the input cylinder.

[0024] Multistage evaporation, vapor compression and reuse, and reversing valves used for switching on and off in pipelines are all existing technologies in the field. This invention is an improvement on the feed film formation, in-tank flow guidance, and central vortex stabilization structure of existing multistage evaporators.

[0025] A spiral guide plate 3 is fixed to the inner wall of the cylindrical section of the tank 102. The outer edge of the spiral guide plate 3 is continuously welded to the inner wall of the tank 102. It spirals down from the upper part of the tank along the inner wall. Its plate surface is inclined towards the tank wall with the outer side lower and the inner side higher in the radial section. The inner edge of the spiral guide plate 3 is turned up to form a limiting protrusion 301. The top of the limiting protrusion 301 is provided with a smooth inner chamfer 3011. A redistribution ring 4 is provided at the downward end of the spiral guide plate 3. The redistribution ring 4 fits the inner wall of the tank 102 around the whole circle and is fixed to the tank wall by back welding. The cross section of the redistribution ring 4 includes a liquid collection tank 401 and an upper inclined surface 402 and a lower inclined surface 403 respectively provided on both sides of the liquid collection tank 401. Several drainage grooves 4021 are evenly distributed along the circumference of the upper inclined surface 402. The lower inclined surface 403 fits the inner wall of the tank 102. The spiral guide plate 3 and the redistribution ring 4 are alternately arranged in multiple sets along the axial direction of the tank 102 to form a multi-stage liquid film relay.

[0026] The anti-vortex assembly is coaxially suspended at the center of tank 102 via mounting rod 2. The upper end of mounting rod 2 passes through the top wall of input cylinder 1021 and is fixed by fasteners, while the lower end is connected to the top of inverted cone 201. Inverted cone 201 is a hollow cone, positioned below input port 1022 with the larger end at the top and the smaller end at the bottom. Several pressure stabilizing holes 2011 are spaced apart on the upper large end peripheral wall. The pressure stabilizing holes 2011 are located in the gas phase region above the gas-liquid interface inside the tank. The cone wall is provided with liquid guiding ribs 2012, and the spiral direction of the liquid guiding ribs 2012 is the same as the spiral direction of the spiral guide plate 3. The lower end of the inverted cone 201 is welded and fixed to the center of the cross grid frame 202. The four ends of the cross grid frame 202 are fixed with cross-shaped grid plates 2022. The upper and lower ends of the grid plates 2022 are provided with streamlined drag-reducing ends 2023. The upper end of the cross grid frame 202 is provided with drag-reducing end 1021. The four ends of the cross grid frame 202 are all fixedly installed with counterweights 2026 through mounting blocks 2024. The upper end of the mounting blocks 2024 is provided with drag-reducing end 3025. The counterweights 2026 keep the anti-vortex assembly coaxially tensioned and limit radial sway.

[0027] Wastewater enters the inlet cylinder 1021 tangentially at high speed through the inlet pipe 101 and inlet pipe 1011. The converging pipe accelerates the flow, and the guide tongue 1012 and the diverting hole 1013 split the flow and guide it to the inner wall. The flow enters the tank 102 through the inlet 1022, forming a wall-adhering swirling flow. It then spirals downwards along the spiral guide plate 3, which is lower on the outside and higher on the inside. The limiting protrusion 301 prevents the flow from derailing. At the end of the spiral guide plate 3, the flow converges into the collection trough 401 of the redistribution ring 4. It is then evenly distributed circumferentially through the diversion groove 4021 on the upper inclined surface 402, and reconstituted on the tank wall through the lower inclined surface 403 that adheres to the tank wall. A uniform annular descending liquid film is transferred to the next set of spiral guide plates, thus forming a film and evaporating and concentrating it step by step. At the same time, the central inverted cone 201 occupies and stabilizes the central gas core. The pressure stabilizing hole 2011 connects the hollow inner cavity with the gas phase region to balance the gas core pressure. The liquid splashed onto the cone surface is smoothly guided into the cross grid 202 through the liquid guiding rib 2012 in the same direction as the spiral guide plate, and then flows down along the grid plate 2022. Each drag reduction end eliminates the eddy current retention behind the plate. The residual liquid is guided back to the liquid film on the tank wall through the lower end of the grid plate. The counterweight 2026 ensures that the component is centered and does not swing, thus achieving the state of swirling film formation on the wall and stabilization of the central gas core.

[0028] Each of the two input pipes 1011 is equipped with a conventional reversing valve, namely a first reversing valve and a second reversing valve, and the tangential directions of the two input pipes 1011 are opposite. The feed spiral direction of one pipe is consistent with the spiral direction of the spiral guide plate 3, which is the forward input pipe, and the spiral direction of the other pipe is opposite to that of the spiral guide plate 3, which is the reverse input pipe. In the forward film formation mode, i.e., normal evaporation and long-term operation, the first reversing valve opens the forward input pipe and the second reversing valve cuts off the reverse input pipe. The liquid flow spiral direction is consistent with the spiral guide plate 3, and it flows smoothly down the spiral guide plate to form a continuous wall-adhering liquid film for evaporation. The reverse backwashing mode is a periodic short-term operation, which can be triggered when the pressure difference or heat exchange temperature difference in the circulation loop rises to a set threshold. At this time, the first... A first reversing valve cuts off the forward input pipe, and a second reversing valve opens the reverse input pipe. The liquid flow enters in the opposite direction to the spiral guide plate 3 and the limiting protrusion 301. It is blocked step by step by the spiral guide plate 3 and the limiting protrusion 301, resulting in strong turbulence and reverse shearing. This lifts and peels off the initial loose scale layer on the spiral guide plate surface, the limiting protrusion, and the tank wall. The scale debris is carried away by the circulating liquid through the external circulation loop. After the backwash is completed, the forward input pipe is switched back to resume the film-forming evaporation on the wall. In this embodiment, the reverse operation is not for the purpose of film-forming evaporation, but to briefly use the fixed spiral guide plate to block the reverse liquid flow to form turbulent cleaning. Thus, the same set of fixed guide plate structures can take into account both forward film formation and online reverse backwashing without stopping the machine and opening the cover to clean the scale.

[0029] Working principle: When wastewater is sent into the input pipe 1011 through the infusion pipe 101, since the input pipe 1011 is tangentially connected to the inner wall of the input cylinder 1021, the liquid flow does not pass through the cylinder core after entering, but obtains a moment of momentum around the axis of the tank body 102 along the tangential direction. Under the action of conservation of moment of momentum, a vortex naturally forms around the axis. The input pipe 1011 gradually narrows along the feeding direction. According to the principle of fluid continuity, the flow cross-section is reduced, which accelerates the liquid flow at the end, thereby increasing the initial velocity and centrifugal intensity of the vortex. The end guide tongue 1012 lifts the single stream and guides it to the inner wall of the input cylinder. The diversion hole 1013 on it divides the liquid flow into several fine bundles, which not only eliminates the circumferential deflection and wall impact caused by the single jet, but also allows the liquid flow to initially spread out circumferentially before entering the input port 1022, forming an initial vortex close to the wall surface, creating uniform flow conditions for subsequent film formation.

[0030] After the liquid flows into the tank 102 through the inlet 1022, it continues to rotate around the axis. Under the action of centrifugal force, the denser liquid phase is continuously thrown towards the tank wall, forming an annular liquid layer in the near-wall area, while the gas phase tends to the center, realizing the natural stratification of gas and liquid in the radial direction. The surface of the spiral guide plate 3 is lower on the outside and higher on the inside in the radial section, with the side attached to the wall being lower and the side closer to the center being higher. Combined with the wall adhesion effect, the liquid flow thrown to the wall can only spiral downward along the spiral guide plate 3 at a fixed pitch, organizing the disordered swirling flow into a regular and continuous spiral descending liquid film, extending the residence path and heat exchange time of the liquid flow on the evaporation wall. The limiting protrusion 301 with the inner edge of the spiral guide plate 3 flips up to form a low baffle, preventing the liquid film from sliding radially towards the center and interrupting the flow when the centrifugal force fluctuates or the load changes. The chamfer 3011 at the top of the plate eliminates the sharp corners that are easy to accumulate and crystallize, reducing the starting point for scale adhesion.

[0031] After the liquid film descends a certain distance along the spiral guide plate 3, it will exhibit uneven circumferential thickness or even dry spots due to swirling attenuation and local evaporation. The redistribution ring 4 at the end of the descent first collects all the upper spiral liquid film through the fully connected collection tank 401 and flattens it circumferentially in the annular groove to eliminate the circumferential flow difference. Then, it overflows in an orderly manner through the evenly distributed guide grooves 4021 on the upper inclined surface 402. A uniform annular descending liquid film is re-established on the tank wall by the lower inclined surface 403 that adheres to the tank wall, and then handed over to the next set of spiral guide plates 3 to continue film formation. Multiple sets of spiral guide plates 3 and redistribution rings 4 are alternately arranged along the axial direction to form a multi-stage relay of spiral film formation, collection and homogenization, and liquid film reconstruction, so that the entire evaporation wall surface is always covered by a continuous liquid film, avoiding the precipitation and scaling of high-salt supersaturated liquid in the stagnant zone and dry wall.

[0032] The swirling flow around the axis forms a low-pressure gas nucleus at the center. When the load fluctuates, the gas nucleus is prone to downward vortexing and entraining droplets, causing cavitation in the circulating pump and a chain reaction leading to liquid interruption and dry wall. The inverted cone 201, with its large end at the top and its small end at the bottom, occupies the position of the central vortex nucleus. Its upper large end blocks the downward channel of the vortex nucleus, suppressing the central forced vortex. The pressure stabilizing hole 2011, located above the gas-liquid interface at the upper large end of the inverted cone 201, connects the hollow inner cavity with the upper gas phase zone, making the gas pressure inside and outside the cone the same, avoiding the formation of negative pressure inside the cone and the suction of the liquid film. The spiral direction of the liquid guiding edge 2012 on the cone wall is consistent with that of the spiral guide plate 3. The droplets splashed onto the cone surface smoothly descend along the same liquid guiding edge and are guided to the lower cross. The grid 202, without colliding with the main vortex, is only arranged in the small diameter area in the center, breaking up the residual forced vortex in the center and stabilizing the air core, without touching the outer ring wall vortex. The drag-reducing end 1 2021, drag-reducing end 2023 and drag-reducing end 3 2025 on the grid plate 2022 are all streamlined to eliminate local vortices and stagnant fouling behind the plate edge. The counterweight block 2026 at the end of the mounting block 2024 provides downward tension in the hanging state, keeping the mounting rod 2, the inverted cone 201 and the cross grid 202 coaxial, suppressing the radial oscillation induced by the vortex, and ensuring that a stable annular channel is always maintained between the central component and the wall vortex.

[0033] Two input pipes 1011 with opposite tangential directions are controlled by the first and second reversing valves in a time-sharing manner. During normal evaporation, the forward input pipe, which is aligned with the spiral guide plate 3, is open. The liquid flow direction is the same as that of the fixed spiral guide plate 3 and the liquid guide ridge 2012, resulting in low flow resistance. The liquid flows smoothly along the spiral guide plate to form a film and evaporate in stages. The secondary steam is compressed and reused according to the existing multi-stage evaporation process, and the feed liquid is concentrated in stages. When the pressure difference or heat exchange temperature difference in the circulation loop increases, indicating the initial formation of scale, the input pipe is briefly switched to the reverse input pipe. The liquid flow direction is aligned with that of the fixed spiral guide plate 3 and the limiting convex ridge 2012. In contrast to block 301, the spiral guide plate 3 no longer serves as a forward guide; instead, it blocks and cuts the reverse liquid flow step by step, generating strong turbulence and reverse shearing on the guide plate surface, near the limiting protrusion 301 and the tank wall. This lifts and peels off the scale layer, which is still in the early stage of loosening, and the scale debris is carried away by the circulating liquid through the external circulation loop. After a short backwash, the flow is switched back to the forward direction to resume low-resistance film formation and evaporation. In this way, with alternating forward and reverse feeding over time, long-term forward film formation and evaporation and periodic online reverse backwashing are achieved simultaneously on the same set of non-rotatable fixed guide plate structures, without the need to stop the machine and open the cover to clean the scale.

[0034] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. An industrial multi-stage wastewater purification and treatment device, comprising a multi-stage evaporator (1), characterized in that: The multi-stage evaporator (1) includes a tank (102) and a delivery pipe (101). The top of the tank (102) is provided with an input cylinder (1021), and the input cylinder (1021) is connected to the inner cavity of the tank (102) through the input port (1022) at its lower part. The infusion tube (101) includes at least one infusion tube (1011) that is tangentially connected to the inner wall of the infusion cylinder (1021). The infusion tube (1011) gradually narrows along the feeding direction, and one end of it that extends into the infusion cylinder (1021) is provided with a liquid guide tongue (1012). A plurality of diversion holes (1013) are spaced apart on the liquid guide tongue (1012). The inner wall of the tank (102) is provided with a spiral guide plate (3), the inner edge of the spiral guide plate (3) is provided with a limiting protrusion (301), and the top of the limiting protrusion (301) is provided with a chamfer (3011). The inner wall of the tank (102) and the downward end of the spiral guide plate (3) are provided with an annular redistribution ring (4). The redistribution ring (4) includes a liquid collection tank (401) and an upper inclined surface (402) and a lower inclined surface (403) respectively provided on both sides of the liquid collection tank (401). The upper inclined surface (402) is provided with a plurality of diversion grooves (4021). Inside the tank (102), a vortex-eliminating assembly is coaxially suspended by a mounting rod (2). The vortex-eliminating assembly includes an inverted cone (201) located above and a cross grid (202) connected below the inverted cone (201). The inverted cone (201) is positioned below the inlet (1022) with the large end on top and the small end on the bottom.

2. The industrial multi-stage wastewater purification treatment device according to claim 1, characterized in that: The input pipe (1011) is provided in two parts. The two input pipes (1011) are symmetrically arranged around the circumference of the input cylinder (1021) and are tangentially connected to the inner wall of the input cylinder (1021). The cross section of the input pipe (1011) gradually shrinks into a flat shape along the feeding direction.

3. The industrial multi-stage wastewater purification treatment device according to claim 2, characterized in that: The liquid guide tongue (1012) extends obliquely from the end of the input pipe (1011) toward the inner wall of the input cylinder (1021). A plurality of the diversion holes (1013) are arranged at intervals along the length of the liquid guide tongue (1012), and the holes of the diversion holes (1013) are inclined toward the inner wall of the input cylinder (1021) to divert the liquid flow into bundles and guide them toward the inner wall of the input cylinder (1021).

4. The industrial multi-stage wastewater purification treatment device according to claim 1, characterized in that: The spiral guide plate (3) spirals down from the upper part of the tank (102) along the inner wall, and its plate surface is inclined towards the inner wall of the tank (102) with the outer side lower and the inner side higher in the radial section; the limiting protrusion (301) flips up from the inner edge of the spiral guide plate (3), and the chamfer (3011) is the smooth inner chamfer at the top of the limiting protrusion (301).

5. The industrial multi-stage wastewater purification treatment device according to claim 1, characterized in that: The redistribution ring (4) is arranged around the inner wall of the tank (102). The liquid collection tank (401) receives the liquid from the end of the spiral guide plate (3). Several diversion channels (4021) are evenly distributed along the circumference of the upper inclined surface (402). The lower inclined surface (403) is arranged around the inner wall of the tank (102), so that the liquid in the liquid collection tank (401) is evenly distributed along the circumference and then forms a uniform annular descending liquid film on the wall of the tank (102) through the lower inclined surface (403).

6. The industrial multi-stage wastewater purification treatment device according to claim 1, characterized in that: The inverted cone (201) is a hollow cone with several pressure stabilizing holes (2011) spaced apart on the peripheral wall of its upper large end. The pressure stabilizing holes (2011) are located in the gas phase region above the gas-liquid interface inside the tank (102). The cone wall of the inverted cone (201) is provided with liquid guiding ribs (2012). The lower small end of the inverted cone (201) is fixedly connected to the cross grid frame (202).

7. The industrial multi-stage wastewater purification treatment device according to claim 6, characterized in that: The cross grid frame (202) is fixedly provided with grid plates (2022) at all four ends. The grid plates (2022) are provided with drag-reducing end two (2023) at both the upper and lower ends. The cross grid frame (202) is provided with drag-reducing end one (2021) at the upper end.

8. The industrial multi-stage wastewater purification treatment device according to claim 1, characterized in that: The four ends of the cross grid (202) are all fixedly mounted with counterweights (2026) by mounting blocks (2024). The counterweights (2026) keep the anti-vortex assembly coaxially tensioned and limit its radial swing. The upper end of the mounting block (2024) is provided with a drag-reducing end three (2025).

9. The industrial multi-stage wastewater purification treatment device according to claim 6, characterized in that: The liquid falling onto the cone surface of the inverted cone (201) is guided to the cross grid (202) by the liquid guide rib (2012), and the spiral direction of the liquid guide rib (2012) is consistent with the spiral direction of the swirling guide plate (3).

10. The industrial multi-stage wastewater purification treatment device according to claim 1, characterized in that: The spiral guide plate (3) and the redistribution ring (4) are arranged alternately in multiple sets along the axial direction of the tank (102) to form a multi-stage liquid film relay.

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