Self-cleaning evaporator and using method

Abstract

The invention relates to the technical field of evaporators, in particular to a self-cleaning evaporator and a using method.The self-cleaning evaporator comprises a separator, the separator is provided with a descaling assembly, the descaling assembly comprises a guide rail assembly and a driven assembly, the guide rail assembly is installed on the outer surface of the separator, and the guide rail assembly comprises a guide rail and a driving assembly; the guide rail is fixed along the outer surface of the separator, the driving assembly is used for driving the driven assembly to move on the inner wall of the separator along the track of the guide rail, the driven assembly is arranged on the inner wall of the separator, the driving assembly comprises a driving driving seat and a driving magnetic attraction seat, and a power mechanism is arranged in the driving driving seat. The invention aims to solve the problems that the separator of the existing evaporator can only be manually disassembled and cleaned after being shut down, and the cleaning process completely depends on manpower.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of evaporators, in particular to a self-cleaning evaporator and a use method. BACKGROUND

[0002] At present, with the continuous improvement of the demand for industrial high-salinity wastewater zero discharge, MVR evaporators have become the core processing equipment in this field due to their energy-saving and efficient characteristics brought by the recycling of steam energy. From the overall architecture, the system mainly includes a heating chamber responsible for heat transfer, a compressor for realizing steam pressure and temperature rise, a separator for realizing vapor-liquid separation, and a circulating pump for ensuring stable circulation of the material liquid, and other key units. Each component works closely together to support the core process of high-salinity wastewater concentration and reduction.

[0003] Among them, the separator is a core unit in the architecture responsible for vapor-liquid separation. It receives the gas-liquid mixture from the heating chamber to realize the precise separation of secondary steam and high-concentration concentrated liquid. The pure secondary steam can be transported to the compressor for energy upgrading and reused as a heating heat source, while the separated concentrated liquid enters the subsequent processing link. This core separation function enables the full play of the energy-saving and efficient advantages of the MVR evaporator, providing an important guarantee for the stable operation of the whole zero discharge system.

[0004] The existing publication No. CN208130528U discloses an MVR evaporation and crystallization system, which is constructed by an evaporator, a crystallizer, a heater, a circulating pump, a separator, a compressor, a filter, and a heat exchanger. The system realizes rapid crystallization and separation, recycles waste heat, saves energy, materials, and time, is easy to operate, has high efficiency, meets the purpose of stable and reliable system operation, and solves the problems of low heat utilization rate, poor energy-saving performance, and poor product quality.

[0005] Meanwhile, the publication No. CN103623601B discloses a forced circulation evaporator, which mainly solves the problem that the material of the existing forced circulation evaporator easily blocks the inside of the pipeline. By adding a cyclone on the discharge pipeline, the liquid concentration inside the entire evaporator is low. When discharging, the particles (heavy density) flow out from the underflow port, and the liquid (light density) returns from the overflow pipe. When flowing to the receiving device, the concentration is very high, which avoids the problem that the liquid concentration in the pipeline is too high, causing pipeline blockage.

[0006] The inner wall of the separator of the evaporator is in contact with high-salinity wastewater for a long time, which will inevitably precipitate calcium and magnesium scales and sulfate crystals. Once the scales are formed, the heat transfer efficiency will decrease. However, the separator of the existing evaporator can only be manually disassembled and cleaned after shutdown. The cleaning process completely relies on manual operation, which takes a long time for single cleaning, causes annual production capacity loss, and leads to a sharp increase in maintenance costs during long-term operation of the equipment. SUMMARY

[0007] The present application aims to provide a self-cleaning evaporator and a use method to solve the problem that the separator of the existing evaporator can only be manually disassembled and cleaned, and the cleaning process completely depends on manual operation.

[0008] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0009] A self-cleaning evaporator comprises a separator, wherein a descaling assembly is installed on the separator, the descaling assembly comprises a guide rail assembly and a driven assembly, the guide rail assembly is installed on the outer surface of the separator, the guide rail assembly comprises a guide rail and a driving assembly, the guide rail is fixed along the outer surface of the separator, and the driving assembly is used to drive the driven assembly to move along the track of the guide rail on the inner wall of the separator, and the driven assembly is arranged on the inner wall of the separator.

[0010] Preferably, the driving assembly comprises a driving driving seat and a driving magnetic seat, the driving driving seat is internally provided with a power mechanism, and the driving power is provided for the movement of the driving magnetic seat along the guide rail.

[0011] Preferably, the driven assembly comprises a driven connecting seat and a scraping plate, the scraping plate and the driven connecting seat are fixedly connected, the scraping plate is attached to the inner wall of the separator, and the driven connecting seat is made of a magnetically conductive material and is magnetically attracted to the driving magnetic seat.

[0012] Preferably, the two sides of the driving driving seat are symmetrically connected with an electric driving wheel, and the driving driving seat drives the electric driving wheel to rotate through the power box arranged on the surface thereof.

[0013] Preferably, the guide rail assembly comprises an upper annular frame, a vertical guide rail and a lower annular frame, the number of the vertical guide rails is multiple, and the vertical guide rails are arranged in a ring array and uniformly arranged in a circular ring array along the circumferential direction of the upper annular frame and the lower annular frame, the upper ends of the vertical guide rails are fixedly connected with the upper annular frame, the lower ends are fixedly connected with the lower annular frame, and the track grooves of the vertical guide rails are seamlessly connected with the track grooves of the upper annular frame and the lower annular frame.

[0014] Preferably, the track of the upper annular frame and the lower annular frame is equipped with a circumferential transmission seat, the circumferential transmission seat is used to drive the driving assembly to make circumferential motion, and the circumferential transmission seat is in track path communication with the track of the vertical guide rail.

[0015] Preferably, the outer side of the circumferential transmission seat is rotatably connected with an electric walking wheel, and the electric walking wheel is driven to rotate by the power box arranged on the surface thereof.

[0016] Preferably, the inner side of the active drive seat is rotationally connected with an adjusting screw, the adjusting screw is driven to rotate by an internal motor box, the bottom end of the active magnetic attraction seat is fixedly connected with an adjusting connecting block, a threaded hole matched with the adjusting screw is formed in the surface of the adjusting connecting block, and the adjusting screw is threaded through the threaded hole to form a screw transmission cooperation.

[0017] A method for using the self-cleaning evaporator, comprising a vertical guide rail circulating descaling step, the specific steps are as follows:

[0018] Step A: start the electric walking wheel of the inner circumferential transmission seat of the upper annular frame, drive the active assembly to move along the circumferential track of the upper annular frame, synchronously drag the driven assembly to move along the inner wall of the separator, until the electric driving wheel is aligned with the target vertical guide rail upper end inlet, stop the circumferential transmission seat;

[0019] Step B: start the electric driving wheel of the active drive seat, drive the active assembly to move downward along the vertical guide rail, synchronously drag the driven assembly to move downward along the inner wall of the separator, while control the circumferential transmission seat of the lower annular frame to move to the vertical guide rail lower end outlet;

[0020] Step C: after the active assembly enters the circumferential transmission seat of the lower annular frame, stop the electric driving wheel, start the circumferential transmission seat in the lower annular frame to drive the active assembly to move circumferentially to the next vertical guide rail lower end inlet;

[0021] Step D: start the electric driving wheel to rotate reversely, drive the active assembly to move upward along the next vertical guide rail, drag the driven assembly to move upward axially, synchronously control the circumferential transmission seat of the upper annular frame to move to the vertical guide rail upper end outlet.

[0022] Preferably, the method further comprises a magnetic attraction strength step-by-step adjusting step, the specific steps are as follows:

[0023] Step 1: rotate the adjusting screw around its own axis;

[0024] Step 2: through the screw cooperation of the adjusting connecting block and the adjusting screw, drive the active magnetic attraction seat to move along the direction close to the outer wall of the separator;

[0025] Step 3: drive the adjusting screw to move the active magnetic attraction seat by 0.5mm each time, and real-time monitor the magnetic field strength through the magnetic field strength instrument attached to the outer wall of the separator;

[0026] Step 4: continue to adjust until the adsorption force corresponding to the magnetic field strength is greater than 1.2 times the weight of the driven assembly, stop the rotation of the adjusting screw and lock the position of the active magnetic attraction seat.

[0027] Compared with the prior art, the method has the following beneficial effects:

[0028] 1. The magnetic coupling transmission adopts a driving magnetic seat and a driven connecting seat, does not need to open a mechanical transmission hole on the separator shell, completely avoids the sealing failure risk caused by the traditional mechanical transmission, and is particularly suitable for high pressure, high temperature or corrosive medium environment, such as chemical waste water treatment scene, and can reduce the shutdown maintenance frequency caused by leakage;

[0029] 2. The three-dimensional frame formed by the upper ring frame, the vertical guide rail and the lower ring frame can remove the scale layer on the inner wall of the separator through the circular switching-vertical movement-circular re-switching circulation path, and reduces the labor cost through automatic cleaning;

[0030] 3. By adjusting the screw and the screw transmission cooperation of the adjusting connecting block, the driving magnetic seat can be driven to approach or move away from the outer wall of the separator, when the scale layer is thick, the distance can be reduced to enhance the magnetic attraction force, and the scraping plate can ensure enough force to scrape thick scale; when the scale layer is thin, the distance can be increased to weaken the magnetic force, so as to avoid that the scraping plate excessively extrudes the inner wall and causes abrasion. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of the separator of the present application;

[0032] Figure 2 It is a structural schematic diagram of the scale removal assembly of the present application;

[0033] Figure 3 It is a sectional view of the scale removal assembly of the present application;

[0034] Figure 4 It is an enlarged view of A in the present application; Figure 3

[0035] Figure 5 It is a structural schematic diagram of the driving assembly of the present application;

[0036] Figure 6 It is a structural schematic diagram of the electric driving wheel of the present application;

[0037] Figure 7 It is a structural schematic diagram of the driven balance wheel of the present application;

[0038] Figure 8 It is a structural schematic diagram of the driving seat of the present application;

[0039] Figure 9 It is a structural schematic diagram of the adjusting connecting block of the present application;

[0040] Figure 10 It is a sectional front view of the separator of the present application.

[0041] ​In the figure: 1, separator; 2, material circulation into pipe; 3, material circulation outlet pipe; 4, maintenance person pipe; 5, upper annular frame; 6, vertical guide rail; 7, lower annular frame; 8, driven connecting seat; 9, shovel scraping plate; 10, circumferential transmission seat; 11, electric walking wheel; 12, driving seat; 13, electric driving wheel; 14, driven balance wheel; 15, adjusting screw; 16, threaded hole; 17, adjusting connecting block; 18, driving magnetic attraction seat. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0043] Please refer to Figures 1 to 10 The present application provides a technical solution, which aims to realize the automatic removal of the scale layer on the inner wall of the evaporator separator through the linkage of the outer rail driving and the inner rail magnetic attraction, and avoid the tedious manual disassembly and cleaning. The specific structure and use method are as follows:

[0044] The self-cleaning evaporator comprises a separator 1, which is installed with a descaling assembly, is a core separation cavity of the evaporator, and has an inner wall prone to scale layer formation due to scale and impurities attached thereto in long-term operation, affecting heat exchange efficiency. The descaling assembly is used for automatically removing the scale layer on the inner wall of the separator 1 and comprises an outer rail power unit and an inner rail execution unit. Specifically, the descaling assembly comprises a guide rail assembly and a driven assembly. The guide rail assembly is installed on the outer surface of the separator 1 and comprises a guide rail and a driving assembly. The guide rail is fixed along a preset track of the outer surface of the separator 1 to provide accurate path constraints for the movement of the driving assembly. The driving assembly is used to drive the driven assembly to move along the track of the guide rail on the inner wall of the separator 1. The driving assembly comprises a driving drive base 12 and a driving magnetic suction base 18. The driving drive base 12 is internally provided with a power mechanism (such as a motor and a transmission gear), which provides driving force for the movement of the driving magnetic suction base 18 along the guide rail. The driving magnetic suction base 18 is linked with the driving drive base 12 and can move along the preset track of the guide rail. Meanwhile, the driving magnetic suction base 18 and the driven assembly on the inner wall of the separator 1 form synchronous constraints through magnetic force. The two components realize synchronous action through magnetic attraction and cooperation, and finally complete the removal of the scale layer on the inner wall.

[0045] The guide rail assembly provides a global motion path for the radial switching and axial movement of the driving assembly. The guide rail assembly comprises an upper annular frame 5, a vertical guide rail 6, and a lower annular frame 7. The vertical guide rail 6 is in the form of a plurality of annular arrays and is uniformly arranged along the circumferential direction of the upper annular frame 5 and the lower annular frame 7. The upper ends of the plurality of vertical guide rails 6 are fixedly connected with the upper annular frame 5, and the lower ends are fixedly connected with the lower annular frame 7, forming a stable three-dimensional frame. The track grooves of the vertical guide rails 6 are seamlessly connected with the track grooves of the upper annular frame 5 and the lower annular frame 7, providing a continuous path for the driving assembly. The driving assembly can make circumferential motion along the upper annular frame 5 and the lower annular frame 7 to adjust the radial position of the driving assembly, thereby aligning with a certain vertical guide rail 6 to be entered. When the driving assembly is aligned with the track groove of a certain vertical guide rail 6 through circumferential motion, the driving assembly can slide into the track groove of the vertical guide rail 6 from the track groove of the annular frame. The driving assembly can make up-and-down motion along the vertical guide rail 6 to adjust the axial position of the driving assembly, thereby driving the driven assembly on the inner wall to remove the scale layer in the axial direction.

[0046] The active component moves to align the new vertical guide rail 6 to the circular motion of the upper ring frame 5 and the lower ring frame 7, and the circular motion of the vertical guide rail 6, which can cover all the corresponding separator 1 inner wall area of the vertical guide rail 6 in turn, and finally realize the automatic cleaning of the separator inner wall scale.

[0047] The two sides of the active drive base 12 are symmetrically connected with the electric driving wheel 13, and the active drive base 12 drives the electric driving wheel 13 to rotate through the power box arranged on the surface of the active drive base 12. The power box is made of a material that can isolate magnetic force (such as permalloy, ultra-low carbon steel, and other high magnetic permeability materials), which prevents the permanent magnet on the active drive base 12 from interfering with the internal power components. Please refer to Figure 6 The power box is integrated with a power component, which includes a motor and a speed reducer. The output shaft of the motor is in transmission connection with the input end of the speed reducer, and the output end of the speed reducer is in transmission connection with the electric driving wheel 13 through a gear transmission mechanism. The electric driving wheel 13 is tightly attached to the inner wall of the vertical guide rail 6 and the circumferential transmission seat 10. When the motor is started, the output power is adjusted in speed and torque through the speed reducer, and then drives the electric driving wheel 13 to rotate actively around its own axis through the gear transmission mechanism. The friction between the wheel surface and the inner wall drives the active drive base 12 to move along the preset track of the guide rail. The two sides of the active drive base 12 are connected with the driven balance wheel 14, which is symmetrically distributed with the electric driving wheel 13 along the radial direction of the active drive base 12. The wheel surface is also attached to the inner wall of the guide rail, and rotates passively with the movement of the active drive base 12, which ensures the smooth movement of the driven balance wheel 14 along the guide rail and avoids tilting.

[0048] The track of the upper annular frame 5 and the track of the lower annular frame 7 are both equipped with a circumferential transmission seat 10, which is used to drive the active assembly to move in a circumferential direction, and the circumferential transmission seat 10 is in track path communication with the track of the vertical guide rail 6, which is used to drive the active assembly to complete radial position switching. The active assembly realizes the full-area descaling of the inner wall of the separator 1 through the cyclic movement of annular switching-vertical movement-annular switching again. Specifically, the radial switching stage of the upper annular frame: in the initial state, the active assembly is placed in the circumferential transmission seat 10 of the upper annular frame 5, the circumferential transmission seat 10 moves along the annular track of the upper annular frame 5 to drive the active assembly to move in a circumferential direction (at this time, the electric driving wheel 13 of the active assembly is in a non-driving state), and the driven assembly on the inner wall of the separator 1 moves in a circumferential direction synchronously until the active assembly moves to the upper end entrance of a target vertical guide rail 6; the vertical guide rail descending stage: when the active assembly is aligned with the upper end entrance of the target vertical guide rail 6, the power box of the active driving seat 12 is started to drive the electric driving wheel 13 to rotate, so that the active assembly moves along the track of the vertical guide rail 6 in a downward direction (at this time, the circumferential transmission seat 10 stops moving), and drives the driven assembly to move in an axial direction of the inner wall of the separator 1 in a downward direction synchronously, thereby completing the removal of the scale layer in the corresponding area of the vertical guide rail, and at the same time, the circumferential transmission seat 10 in the lower annular frame 7 moves to the lower end exit of the vertical guide rail 6 and aligns with the end of the track of the vertical guide rail 6, thereby waiting to receive the active assembly; the radial switching stage of the lower annular frame: after the active assembly moves to the circumferential transmission seat 10 of the lower annular frame 7 along the vertical guide rail 6, the two form a transmission cooperation, the circumferential transmission seat 10 of the lower annular frame 7 moves along the annular track to drive the active assembly to move in a circumferential direction (the electric driving wheel 13 is switched to a non-driving state again), and the driven assembly moves in a circumferential direction synchronously until the active assembly moves to the lower end entrance of the next vertical guide rail 6; the vertical guide rail ascending stage: when the active assembly is aligned with the lower end entrance of the next vertical guide rail 6, the power box of the active driving seat 12 is started again to drive the electric driving wheel 13 to rotate in a reverse direction, so that the active assembly moves along the track of the vertical guide rail 6 in an upward direction, and drives the driven assembly to move in an axial direction of the inner wall of the separator 1 in an upward direction synchronously, thereby completing the removal of the scale layer in the corresponding area of the vertical guide rail, and at the same time, the circumferential transmission seat 10 in the upper annular frame 5 moves to the upper end exit of the vertical guide rail 6, thereby waiting to receive the active assembly; cyclic descaling: the above-mentioned radial switching of the upper annular frame-vertical descending-radial switching of the lower annular frame-vertical ascending action process is repeated until the active assembly drives the driven assembly to complete a cyclic movement along all vertical guide rails 6 (i.e., moving in a circumferential direction along the inner wall of the separator 1 for one cycle), thereby finally realizing the full-area removal of the scale layer on the inner wall of the separator 1.

[0049] The circumferential transmission seat 10 is provided with an independent driving mechanism to realize autonomous movement along the tracks of the upper annular frame 5 and the lower annular frame 7. Specifically, the outer side of the circumferential transmission seat 10 is rotationally connected with an electric walking wheel 11. The electric walking wheel 11 is driven to rotate by a power box arranged on the surface of the electric walking wheel 11. Please refer to Figure 4 、 6 The internal structure of the power box is consistent with the power box on the surface of the active driving seat 12. The wheel surface of the electric walking wheel 11 is closely attached to the inner wall of the track of the upper annular frame 5 and the lower annular frame 7. When the power box is started, the power output by the motor is adjusted in speed and torque through a speed reducer, and then drives the electric walking wheel 11 to actively rotate around its own axis through a gear transmission mechanism. The friction between the wheel surface and the inner wall of the track drives the circumferential transmission seat 10 to move along the circular track of the upper annular frame 5 or the lower annular frame 7.

[0050] A magnetic attraction strength adjusting mechanism is arranged between the active driving seat 12 and the active magnetic attraction seat 18 to accurately control the distance between the active magnetic attraction seat 18 and the outer wall of the separator 1. The inner side of the active driving seat 12 is rotationally connected with an adjusting screw 15. The adjusting screw 15 is driven to rotate by an internal motor box (the motor box is integrated with a motor and is installed in the interior of the active driving seat 12. The output shaft is in transmission connection with the adjusting screw 15). The bottom end of the active magnetic attraction seat 18 is fixedly connected with an adjusting connecting block 17. The surface of the adjusting connecting block 17 is provided with a threaded hole 16 matched with the adjusting screw 15. The adjusting screw 15 is threadedly penetrated through the threaded hole 16 to form a screw transmission cooperation. When it is necessary to adjust the distance between the active magnetic attraction seat 18 and the separator 1, the motor driving the adjusting screw 15 is started. The adjusting screw 15 rotates around its own axis. Through the screw cooperation between the threaded hole 16 and the adjusting screw 15, the adjusting connecting block 17 is driven to move along the axial direction of the adjusting screw 15 (i.e. the direction of approaching or moving away from the separator 1), thereby driving the active magnetic attraction seat 18 to move synchronously in the axial direction, so as to control the distance between the active magnetic attraction seat 18 and the outer wall of the separator 1.

[0051] Since the magnetic field strength B is inversely proportional to the square of the distance d (i.e. B∝1 / d²), the change of the distance between the active magnetic attraction seat 18 and the separator 1 can directly change the magnetic attraction strength of the inner wall driven connecting seat 8. By adjusting the distance between the active magnetic attraction seat 18 and the separator 1, the magnetic field strength can be controlled. In actual adjustment, a step-by-step fine adjustment mode is adopted: the active magnetic attraction seat 18 is driven to move by 0.5 mm each time by the adjusting screw 15. The current magnetic field strength is monitored in real time by a magnetic field strength instrument attached to the outer wall of the separator 1 until the preset target adsorption force is reached.

[0052] The outer peripheral wall of the separator 1 is provided with a plurality of communication channels, including material circulation inlet pipe 2, material circulation outlet pipe 3, maintenance personnel pipe 4 and other communication channels. The material circulation inlet pipe 2, the material circulation outlet pipe 3 and the maintenance personnel pipe 4 are distributed along the axial direction and the peripheral direction of the separator 1 (i.e. not on the same vertical line). Due to the arrangement of the above-mentioned pipes, part of the vertical guide rail 6 may form spatial overlap with the outer peripheral contour of the pipe (i.e. the preset track of the vertical guide rail 6 conflicts with the installation position of the pipe). In view of this situation, the vertical guide rail 6 in the overlapping area is designed to avoid overlap: the vertical guide rail 6 is disconnected along the overlapping area to form an upper segmented guide rail and a lower segmented guide rail which are independent of each other. The cleaning steps for the segmented vertical guide rail 6 are as follows: upper segmented guide rail cleaning: the driving assembly is first moved along the upper annular frame 5 to the upper end inlet of the segmented vertical guide rail 6, so that the driving assembly moves downward along the upper segmented guide rail, driving the driven assembly to complete the scale layer cleaning of the corresponding separator 1 inner wall area of the upper segmented guide rail; after cleaning is completed, the driving assembly returns upward along the upper segmented guide rail and enters the upper annular frame 5, and then transitions to the lower annular frame 7: the driving assembly moves along the upper annular frame 5 to the upper end inlet of the adjacent complete vertical guide rail 6, moves downward along the complete vertical guide rail 6 to the lower annular frame 7, and realizes the transition from the upper annular frame 5 to the lower annular frame 7; lower segmented guide rail cleaning: the driving assembly moves along the lower annular frame 7 to the lower end inlet of the lower segmented guide rail of the segmented vertical guide rail 6, so that the driving assembly moves upward along the lower segmented guide rail, driving the driven assembly to complete the scale layer cleaning of the corresponding separator 1 inner wall area of the lower segmented guide rail. After cleaning is completed, the driving assembly returns downward along the lower segmented guide rail and enters the lower annular frame 7.

[0053] A method for using a self-cleaning evaporator, including a vertical guide rail 6 circulating scale removal step, the specific steps are as follows:

[0054] Step A: Start the electric walking wheel 11 of the circumferential transmission seat 10 in the upper annular frame 5, drive the driving assembly to move along the track circumference of the upper annular frame 5, synchronously pull the driven assembly to move along the circumference of the inner wall of the separator 1, until the electric driving wheel 13 is aligned with the upper end inlet of the target vertical guide rail 6, and the circumferential transmission seat 10 is stopped;

[0055] Step B: Start the electric driving wheel 13 of the driving drive seat 12, drive the driving assembly to move downward along the vertical guide rail 6, synchronously pull the driven assembly to move downward along the inner wall of the separator 1, and control the circumferential transmission seat 10 of the lower annular frame 7 to move to the lower end outlet of the vertical guide rail 6;

[0056] Step C: After the driving assembly enters the circumferential transmission seat 10 of the lower annular frame 7, stop the electric driving wheel 13, and start the circumferential transmission seat 10 in the lower annular frame 7 to drive the driving assembly to move circumferentially to the lower end inlet of the next vertical guide rail 6;

[0057] Step D: Start the electric driving wheel 13 to rotate reversely, drive the driving assembly to move upwards along the next vertical guide rail 6, and pull the driven assembly to move upwards to remove the scale, and synchronously control the circumferential transmission seat 10 of the upper ring-shaped frame 5 to move to the outlet of the upper end of the vertical guide rail 6.

[0058] It also includes a step of step-by-step adjustment of magnetic attraction strength, and the specific steps are as follows:

[0059] Step 1: Rotate the adjusting screw 15 around its own axis;

[0060] Step 2: Through the screw joint of the adjusting connecting block 17 and the adjusting screw 15, drive the driving magnetic attraction seat 18 to move in the direction close to the outer wall of the separator 1;

[0061] Step 3: Drive the adjusting screw 15 to move the driving magnetic attraction seat 18 by 0.5 mm each time, and monitor the magnetic field strength in real time through the magnetic field strength instrument attached to the outer wall of the separator 1;

[0062] Step 4: Continue to adjust until the adsorption force corresponding to the magnetic field strength is greater than 1.2 times the weight of the driven assembly, stop the rotation of the adjusting screw 15, and lock the position of the driving magnetic attraction seat 18.

[0063] The specific scheme is that the driving magnetic attraction seat 18 is arranged outside the separator 1, the built-in permanent magnet (such as neodymium iron boron strong magnet, temperature resistance ≥ 150℃, suitable for working temperature of 100~120℃) is arranged in the driven connecting seat 8 inside the separator 1, the wall surface of the separator 1 is made of 316L stainless steel with a thickness of ≤10mm, and the magnetic resistance is small to form magnetic adsorption and transmission, and there is no need to open a hole in the wall surface of the separator.

[0064] The outer wall of the driven connecting seat 8 is designed as an arc (the curvature is consistent with the inner wall of the separator 1) attached to the inner wall of the separator 1, the shovel scraping plate 9 is made of flexible cleaning material (such as wear-resistant rubber scraping plate), and the upper and lower movement can directly scrape the scale layer (such as crystalline scale and cohesive scale formed by high-salt wastewater) on the inner wall, and the cleaning pressure can be adjusted by the adsorption force of the external driving magnetic attraction seat 18 (adjusted by adjusting the distance between the driving magnetic attraction seat 18 and the outer wall of the separator 1 through the adjusting screw 15).

[0065] The driving magnetic attraction seat 18 is a permanent magnet, the polarity of the built-in permanent magnet in the driven connecting seat 8 is opposite (opposite poles attract each other), the surface magnetic field strength is ≥2000Gs, and the adsorption force can drive the driven assembly to overcome the friction force of the inner wall.

[0066] All the components (such as the driven connecting seat 8 and the shovel scraping plate 9) in contact with the material are made of acid and alkali resistant and high temperature resistant materials (such as PFA and PTFE), which are suitable for high-salt wastewater and organic wastewater scenes with pH2~12.

[0067] If the driven connection seat 8 is stuck (the external motor current rises by ≥20%), the system takes emergency protection measures of automatic shutdown and alarm to avoid overload damage;

[0068] Control the cleaning cycle (such as starting once every 48 hours) to avoid too thick wall scale layer, which causes the external magnetic ring to fail to drive the driven assembly.

[0069] The driven connection seat 8 is optimized to be streamlined to reduce fluid resistance; the cleaning action avoids the high load operation period of the evaporator (such as starting at night during low load, and the single cleaning time is ≤15 minutes).

[0070] The external transmission part is easy to maintain, and the driven assembly can be taken out by magnetic field attraction without disassembly (such as moving the driven connection seat 8 to the maintenance man pipe 4 by the external driving magnetic attraction seat 18 when the machine is stopped, and taking out by opening the maintenance cover).

[0071] This scheme can be directly applied to the separator modification of existing MVR evaporators, with short cycle and significant practical value in high-salinity wastewater treatment field.

[0072] The scraped scale layer will be wrapped and carried by the high-speed material flow and returned to the heater (for continuous concentration), with the path being: scale layer-separator 1-material circulation outlet pipe 3-forced circulation pump-heater-again into separator 1; The scale layer reenters the heating chamber with the material and further crystallizes and grows at high temperature (especially suitable for high-salinity materials such as NaCl and Na2SO4, and the crystallinity increases with concentration); eventually, larger particles are formed, which are easier to separate; when the particle size of the scale layer is ≥0.5mm, the scale layer will preferentially deposit at the bottom and be discharged through the discharge port; specifically, the circulation pump flow is temporarily increased to 150% (for 5-10 minutes) during cleaning to quickly remove the scraped scale layer from the inner wall of the separator 1 and prevent reattachment; after cleaning, the flow rate returns to the rated value to maintain normal evaporation circulation and ensure that the scale layer is continuously concentrated with the material.

[0073] Automatic cleaning process (graded trigger):

[0074] When performing light cleaning, first start the cleaning body flushing hole, flush the gap with 0.3L / min distilled water for 5s; then control the driven connection seat 8 to move up and down at a speed of 10mm / s for 3 strokes (covering the cleaning area), and remove the scale layer with the scraper 9; then the scale-containing wastewater is discharged into the subsequent salt separation system with the concentrated liquid at the bottom of the separator 1, without additional discharge.

[0075] When performing moderate cleaning, first start the flush hole at 0.4 L / min for 10 s to soften the cohesive scale; then reduce the speed of the driven connecting seat 8 to 8 mm / s and move for 5 strokes; then pause for 2 s for each stroke to allow the flush liquid to fully soak the scale layer; then use an endoscope to take real-time photos, and if the scale area is ≤15%, stop, otherwise repeat the moderate cleaning step again.

[0076] When performing severe cleaning, first start the flush hole at 0.5 L / min for 20 s to soften the hard scale; then move the driven connecting seat 8 at a speed of 5 mm / s for 8 strokes, and the scraper 9 pressure is increased by 20% through magnetic attraction; then pause for 10 min after cleaning, and if the differential pressure is ≤1.2 times the initial value and the scale area is ≤10%, it is qualified, otherwise trigger the manual auxiliary cleaning alarm (without disassembly, supplement the cleaning through the maintenance man pipe 4).

[0077] 15 min after cleaning, detect the secondary liquid rate ≤0.8%, the separator differential pressure ≤1.1 times the initial value, and the inner wall scale area ≤10%, and determine that the cleaning is qualified; if it does not meet the standard, automatically repeat the corresponding level of cleaning once, and if it still does not meet the standard, send an alarm signal to the central control room.

[0078] Daily maintenance steps, check the external guide rail slider lubrication every 30 days, and supplement PTFE lubricating grease; check the wear of the driven assembly every 90 days (when the wear is ≥3 mm, stop the machine and replace the driven connecting seat 8 to the maintenance man pipe 4 through the external active magnetic seat 18); calibrate the magnetic ring attraction force every 180 days.

[0079] Although embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, replacements and changes can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A self-cleaning evaporator, comprising a separator (1), characterized in that: The separator (1) is equipped with a descaling assembly, which includes a guide rail assembly and a driven assembly. The guide rail assembly is installed on the outer surface of the separator (1). The guide rail assembly includes a guide track and an active assembly. The guide track is fixed along the outer surface of the separator (1). The active assembly is used to drive the driven assembly to move along the track of the guide track on the inner wall of the separator (1). The driven assembly is arranged on the inner wall of the separator (1).

2. A self-cleaning evaporator according to claim 1, characterized in that: The active component comprises an active driving seat (12) and an active magnetic seat (18); the active driving seat (12) has a built-in power mechanism for providing driving force for the active magnetic seat (18) to move along the guide track.

3. The self-cleaning evaporator according to claim 2, characterized in that: The driven assembly includes a driven connecting seat (8) and a scraping blade (9), wherein the scraping blade (9) and the driven connecting seat (8) are fixedly connected, and the scraping blade (9) is in contact with the inner wall of the separator (1). The driven connecting seat (8) is made of a magnetic conductive material and forms a magnetic fit with the active magnetic seat (18).

4. The self-cleaning evaporator according to claim 3, characterized in that: The two sides of the active drive seat (12) are symmetrically connected to the electric active wheels (13), and the active drive seat (12) drives the electric active wheels (13) to rotate via a power supply box provided on the surface of the active drive seat (12).

5. The self-cleaning evaporator according to claim 4, characterized in that: The guide rail assembly comprises an upper annular frame (5), a vertical guide rail (6) and a lower annular frame (7); the number of the vertical guide rails (6) is plural and they are arranged in an annular array and are evenly arranged in an annular array along the circumferential direction of the upper annular frame (5) and the lower annular frame (7); the upper ends of the plurality of vertical guide rails (6) are fixedly connected to the upper annular frame (5), and the lower ends are fixedly connected to the lower annular frame (7); and the track grooves of the vertical guide rails (6) are seamlessly connected to the track grooves of the upper annular frame (5) and the lower annular frame (7).

6. The self-cleaning evaporator according to claim 5, characterized in that: A circumferential transmission seat (10) is installed in the tracks of the upper annular frame (5) and the lower annular frame (7). The circumferential transmission seat (10) is used to drive the active component to perform circular motion, and the circumferential transmission seat (10) is connected to the track of the vertical guide rail (6) to achieve a track path.

7. The self-cleaning evaporator according to claim 6, characterized in that: The outer side of the circumferential transmission seat (10) is rotatably connected to an electric running wheel (11), and the electric running wheel (11) is driven to rotate by a power supply box provided on the surface of the electric running wheel (11).

8. The self-cleaning evaporator according to claim 7, characterized in that: The inner side of the active drive seat (12) is rotatably connected to an adjusting screw (15), and the adjusting screw (15) is driven to rotate by a built-in motor box. The bottom end of the active magnetic seat (18) is fixedly connected to an adjusting connection block (17), and a threaded hole (16) adapted to the adjusting screw (15) is provided on the surface of the adjusting connection block (17), and the adjusting screw (15) is threadedly penetrated through the threaded hole (16) to form a spiral transmission fit.

9. A method for using the self-cleaning evaporator according to claim 8, characterized in that: The process includes a vertical guide rail (6) cycle descaling step, the specific steps are as follows: Step A: Start the electric running wheel (11) of the inner circumferential transmission seat (10) of the upper annular frame (5), drive the active component to move along the circumference of the track of the upper annular frame (5), and synchronously pull the driven component to move along the circumference of the inner wall of the separator (1) until the electric driving wheel (13) is aligned with the upper end entrance of the target vertical guide rail (6), and stop the circumferential transmission seat (10); Step B: starting the electric driving wheel (13) of the active driving seat (12), driving the active component to move downward along the vertical guide rail (6), synchronously pulling the driven component downward along the inner wall of the separator (1) to remove scale, and at the same time controlling the circumferential transmission seat (10) of the lower annular frame (7) to move to the lower end outlet of the vertical guide rail (6) to receive the load; Step C: After the active component enters the circumferential transmission seat (10) of the lower annular frame (7), the electric driving wheel (13) is stopped, and the circumferential transmission seat (10) in the lower annular frame (7) is started to drive the active component to move circumferentially to the lower end entrance of the next vertical guide rail (6); Step D: Start the electric driving wheel (13) to rotate in the opposite direction, drive the driving component to move upward along the next vertical guide rail (6), pull the driven component axially upward to remove scale, and synchronously control the circumferential transmission seat (10) of the upper annular frame (5) to move to the upper end outlet of the vertical guide rail (6) to receive it.

10. The method for using the self-cleaning evaporator according to claim 9, characterized in that: It also includes a step-by-step adjustment procedure for the magnetic attraction strength, the specific steps are as follows: Step 1: Rotate the adjusting screw (15) around its own axis; Step 2: By adjusting the screw fit between the connecting block (17) and the adjusting screw (15), the active magnetic seat (18) is driven to move in a direction close to the outer wall of the separator (1); Step 3: Each time the adjusting screw (15) is driven, the active magnetic seat (18) moves 0.5 mm, and the magnetic field strength is monitored in real time by a magnetic field strength meter attached to the outer wall of the separator (1); Step 4: Continue to adjust until the magnetic field strength corresponds to an adsorption force ≥ 1.2 times the weight of the driven component, stop adjusting the screw (15) and rotate to lock the active magnetic seat (18) position.

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