Zero-discharge evaporative crystallization device for salt chemical wastewater

Abstract

The invention relates to the field of salt-containing wastewater crystallization, in particular to a salt chemical wastewater zero-discharge evaporative crystallization device which comprises a main cylinder, supporting legs, diamond plates, a stirring unit, a supporting assembly, an outer sleeve, an interception unit, a driving unit and the like. Crystallization and mother liquor are recycled separately through cooperation of the outer sleeve, the through groove and the rhombic plate, and the mother liquor can be recycled and reused; a plurality of layers of conical wire mesh demisters in the conical barrel are used for purifying boil-off gas and reflowing and purifying intercepted impurities; by means of a rhombic plate linkage structure and cooperation of a vertical plate, a transverse plate and an L-shaped groove, efficient discharging of crystals and convenient ground maintenance of the wire mesh demister are achieved. The method improves salt resource recovery efficiency and product purity, reduces labor intensity and equipment load, guarantees continuous and stable treatment flow, and is suitable for zero discharge treatment of salt chemical wastewater.

Description

Technical Field

[0001] This invention relates to the field of salt wastewater crystallization, and particularly to a zero-discharge evaporation crystallization device for salt chemical wastewater. Background Technology

[0002] High-salt wastewater generated in the salt chemical industry contains a large amount of recyclable salt substances. It is necessary to separate water and salt through an evaporation crystallization device to achieve both wastewater treatment and salt resource recovery for resource utilization.

[0003] However, during the existing wastewater heating and evaporation process, the steam carries impurities such as droplets and fine salt particles. Existing equipment lacks a built-in purification structure and relies on external purification devices for treatment, which can easily lead to the accumulation and blockage of impurities in the external equipment. After the evaporation and crystallization process is completed, mother liquor and some crystallized impurities remain. The mother liquor is rich in high concentrations of recyclable salts. Existing technologies often have difficulty in quickly separating the mother liquor from the crystallized impurities, resulting in the loss of valuable salts or low purity of the final crystallized product, which limits the efficiency of resource recovery.

[0004] In the prior art, patent CN110683601A discloses an energy-saving evaporation crystallization device for high-salt wastewater. The main body consists of a main shell, a liquid container, and a heating device. Steam drives the rotation of blades and a movable shaft within the cover, which in turn stirs the liquid with a fixed rod. Simultaneously, the cover is assembled and disassembled using a locking block and a positioning groove. However, although this technology improves some of the original problems, there are still aspects that require further optimization to better meet actual crystallization needs.

[0005] The device still requires manually opening the cover to remove the liquid container, then pouring out the crystals and cleaning, which is cumbersome. Furthermore, its stirring structure relies on steam, and once heating is complete, steam production stops and the moving shaft stops rotating. If the material is not removed in time, the precipitated crystals will still stick to the walls and bottom of the container, increasing the difficulty of subsequent cleaning and affecting processing efficiency.

[0006] Furthermore, after heating the wastewater, high concentrations of mother liquor and impurities remain. The mother liquor cannot be quickly and completely evaporated, and forced heating will damage the crystal quality. Moreover, the amount of steam is insufficient to drive the stirring structure, which exacerbates the crystal adhesion problem. Therefore, the equipment can only remove the mother liquor and crystals together, and cannot achieve separate treatment and recycling of the mother liquor. It also cannot further extract high-purity salts from the mother liquor, resulting in incomplete wastewater treatment and limited salt recovery rate and product quality.

[0007] In summary, existing technologies can typically only perform preliminary separation of crystals in wastewater after a single heating process, while mother liquor containing high salt content cannot be effectively separated and recycled, resulting in low treatment efficiency and resource recovery rate. Summary of the Invention

[0008] To address the aforementioned problems, this invention provides a zero-discharge evaporation and crystallization device for salt chemical wastewater, comprising a main cylinder with two symmetrically mounted support legs at the bottom. A rhomboid plate, narrowing from the center to both sides, is slidably mounted inside the main cylinder, and a stirring unit for agitating the wastewater is installed inside the rhomboid plate.

[0009] The diamond-shaped plate is also equipped with support components on both sides to drive it to flip.

[0010] Two arc-shaped through grooves are symmetrically opened on the inner wall of the main cylinder, and an outer sleeve is also fitted on the outside of the main cylinder. The inside of the outer sleeve is connected to the inside of the main cylinder through the through grooves. An electrically controlled valve is also installed on the inner wall of the main cylinder to connect the inside of the main cylinder and the outer sleeve. An inlet pipe and a drain pipe connected to the inside of the outer sleeve are respectively installed on the outside of the outer sleeve.

[0011] Preferably, the stirring unit includes an installation cavity opened inside the rhombus plate, and the two sides of the installation cavity are respectively connected to the upper and lower outer walls of the rhombus plate. The bidirectional motor is installed on the inner wall of the installation cavity through a motor base. The two main shafts of the bidirectional motor extend to the upper and lower outer walls of the rhombus plate and are equipped with pointed cones. Several stirring plates are evenly distributed along their axes and in contact with the outer side of the rhombus plate on the outside of the pointed cones.

[0012] Preferably, the end of the stirring plate extends to the edge of the diamond-shaped plate and is fitted with a vertical plate.

[0013] Preferably, the support assembly includes two rectangular cavities symmetrically formed inside the rhombus plate, with one end of each rectangular cavity extending to the outer side of the rhombus plate. A support motor is mounted inside the rectangular cavity via a motor mount, and a spring rod is mounted on the telescopic end of the support motor. An abutment plate that abuts against the inner wall of the main cylinder is mounted on the telescopic end of the spring rod.

[0014] Preferably, a conical cylinder is installed at the upper end of the main cylinder, and a trapping unit is installed inside the conical cylinder to trap impurities such as liquid droplets and fine salt particles in the gas. An exhaust pipe that communicates with the interior of the conical cylinder is installed in the middle of the conical cylinder.

[0015] Preferably, the interception unit includes a mounting ring installed on the inner wall of the conical cylinder. Several annular rings are installed on the internal threads of the mounting ring, which are vertically distributed along its extension. A conical wire mesh demister is installed on the inner diameter of the annular rings.

[0016] Preferably, the mounting ring is threaded to the inner wall of the conical cylinder.

[0017] Preferably, a horizontal plate is installed on one side of the vertical plate, and several L-shaped grooves corresponding to the vertical plate are opened on the outer side of the mounting ring.

[0018] Preferably, the width of the vertical section of the L-shaped groove is consistent with the combined width of the vertical plate and the horizontal plate, and the width of the horizontal section of the L-shaped groove is consistent with the width of the horizontal plate.

[0019] In summary, this application includes at least one of the following beneficial technical effects: I. This invention achieves separate recovery of crystallizer and mother liquor through the design of an outer sleeve, a through-channel, an electrically controlled valve, and a rhomboid plate. After heating and crystallization, the rhomboid plate is driven to rise to the position corresponding to the through-channel, allowing the mother liquor to flow along the inclined surface of the rhomboid plate through the through-channel into the outer sleeve for separate temporary storage and recovery. After the mother liquor is separated, the rhomboid plate descends between the support legs and flips to unload, allowing the crystals to detach and be collected separately. This design avoids resource waste caused by the co-existence of crystallizer and mother liquor, simplifies the separation and recovery process, and allows the mother liquor to be recycled and reheated or directly discharged for treatment, improving operational flexibility and the accuracy of salt resource recovery.

[0020] II. This invention achieves highly efficient purification of evaporating gas by setting up a interception unit consisting of multiple layers of conical wire mesh demisters inside a conical cylinder. The conical structure increases the airflow contact area, facilitating impurity reflux and preventing blockage. The multi-layer layout enables tiered interception of impurities of different particle sizes. The intercepted droplets and salt particles can flow back to the main cylinder for recrystallization, ensuring the cleanliness of the gas discharged from the exhaust pipe, reducing impurity loss, minimizing wear and tear on subsequent pipelines and equipment, and improving the purity of the crystalline product.

[0021] Third, this invention achieves efficient unloading of crystallizers and convenient maintenance of the wire mesh demister through the coordinated design of the rhomboid plate, support components, and drive unit, combined with the cooperation of the vertical plate, horizontal plate, and L-shaped groove. The rhomboid plate's flipping unloading eliminates the need for manual climbing, reducing labor intensity; the wire mesh demister can be lowered to the ground for replacement or cleaning via the lifting and flipping action of the rhomboid plate, without the need for additional disassembly of the conical cylinder, significantly shortening maintenance time, ensuring continuous and stable operation of the device, and improving overall operational efficiency. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] Figure 1 This is a schematic diagram of the structure of the main body of the present invention.

[0024] Figure 2 This is a cross-sectional structural diagram of the main body of the present invention.

[0025] Figure 3 This is a schematic diagram of the stirring unit of the present invention.

[0026] Figure 4 This is a planar sectional view of the support component and drive unit of the present invention.

[0027] Figure 5 This is the present invention. Figure 4 Enlarged view of part of the structure at point A in the middle.

[0028] Figure 6 This is a schematic diagram of the interception unit of the present invention.

[0029] Figure 7 This is a diagram showing the fit between the L-shaped groove and the horizontal plate of the present invention.

[0030] In the diagram, 1. Main cylinder; 10. Support leg; 11. Rhomboid plate; 12. Through groove; 13. Outer sleeve; 14. Electrically controlled valve; 15. Water inlet pipe; 16. Drain pipe; 17. Conical cylinder; 18. Exhaust pipe; 2. Stirring unit; 20. Bidirectional motor; 21. Pointed cone; 22. Stirring plate; 23. Vertical plate; 3. Support assembly; 30. Rectangular cavity; 31. Support motor; 32. Spring rod; 33. Contact plate; 4. Interception unit; 40. Mounting ring; 41. Annular ring; 42. Wire mesh demister; 43. Horizontal plate; 430. L-shaped groove; 5. Drive unit; 50. Sliding groove; 51. Drive groove; 52. Sliding magnetic plate; 53. Drive motor; 54. Drive screw. Detailed Implementation

[0031] The following combination Figures 1 to 7 The embodiments of the present invention will be described in detail below.

[0032] This application discloses a zero-discharge evaporation crystallization device for salt chemical wastewater, which can realize wastewater evaporation crystallization, mother liquor recycling, gas phase impurity purification and efficient crystallization unloading. At the same time, it can conveniently maintain the core purification components and ensure the continuous and stable processing flow.

[0033] Example 1: Refer to Figures 1 to 6 As shown, it includes a main cylinder 1, support legs 10, a rhomboid plate 11, a stirring unit 2, a support assembly 3, a through groove 12, an outer sleeve 13, an electrically controlled valve 14, a water inlet pipe 15, a drain pipe 16, a conical cylinder 17, a trapping unit 4, and an exhaust pipe 18. Two support legs 10 are symmetrically installed at the bottom of the main cylinder 1. A rhomboid plate 11 that narrows from the middle to both sides is slidably installed inside the main cylinder 1. A stirring unit 2 for stirring wastewater is installed inside the rhomboid plate 11. Support assemblies 3 for driving the rhomboid plate 11 to rotate are also installed on both sides of the rhomboid plate 11.

[0034] Two arc-shaped through grooves 12 are symmetrically opened on the inner wall of the main cylinder 1, and an outer sleeve 13 is also fitted on the outer side of the main cylinder 1. The interior of the outer sleeve 13 is connected to the interior of the main cylinder 1 through the through grooves 12. An electrically controlled valve 14 is also installed on the inner wall of the main cylinder 1 to connect the interior of the main cylinder 1 and the outer sleeve 13. An inlet pipe 15 and a drain pipe 16 connected to the interior of the outer sleeve 13 are respectively installed on the outer side of the outer sleeve 13.

[0035] The inlet pipe 15 is connected to an external water supply device, and the drain pipe 16 is connected to an external pumping device. The external water supply device delivers wastewater into the outer sleeve 13 through the inlet pipe 15. After the wastewater enters the outer sleeve 13, the electrically controlled valve 14 is opened, allowing the wastewater in the outer sleeve 13 to flow into the main sleeve 1 through the through groove 12, and finally remain in the cavity of the main sleeve 1 and the upper area of ​​the rhomboid plate 11. The rhomboid plate 11 serves as the bottom of the main sleeve 1, which can move up and down, and supports the wastewater in the main sleeve 1.

[0036] Heating components such as heating plates can be pre-installed inside the main cylinder 1 or inside the rhomboid plate 11. The wastewater in the main cylinder 1 is heated and evaporated by the heating components, which promotes the crystallization of the wastewater. During the heating and crystallization process, the stirring unit 2 is started to continuously stir the wastewater to ensure that the wastewater is heated evenly and to prevent the crystals from sticking together.

[0037] After heating and crystallization, a small amount of mother liquor remains on the rhombus plate 11. At this time, heating is stopped and the plate is allowed to settle for a period of time. Then, the rhombus plate 11 is driven to slide upward by the support component 3 until the edge of the rhombus plate 11 corresponds to the position of the through groove 12 on the inner wall of the main cylinder 1. With the help of the inclined structure on the side of the rhombus plate 11, the remaining mother liquor flows into the inner sleeve 13 along the inclined surface through the through groove 12 for temporary storage.

[0038] After the mother liquor is discharged, the driving rhomboid plate 11 slides downward until it reaches the area between the support legs 10. At this time, the support component 3 and the support legs 10 come into contact with each other. Through their cooperation, the rhomboid plate 11 is stably limited between the support legs 10. Then, the support component 3 drives the rhomboid plate 11 to rotate 180 degrees, so that the side that originally supported the crystals faces down. The crystals fall off under the action of gravity to complete the unloading, so that the operator can place receiving equipment on the ground to collect and store the crystals.

[0039] After unloading, the drive diamond plate 11 slides upwards again to return to the inside of the main cylinder 1, restoring the main cylinder 1 to its structural state where it can support wastewater. Then, the external water supply equipment supplies new wastewater into the outer cylinder 13 through the inlet pipe 15, so that the new wastewater mixes with the mother liquor temporarily stored in the outer cylinder 13; the stirring unit 2 is started to stir the mixed solution to make it uniform, and then the above-mentioned operation process of heating, stirring, crystallization, mother liquor discharge, and unloading is repeated.

[0040] This cycle continues until the last wave of wastewater is heated and crystallized. The last remaining mother liquor flows into the outer casing 13 through the through-channel 12. At this point, the external pumping equipment is activated to extract and collect all the last wave of mother liquor stored in the outer casing 13 through the drain pipe 16. This allows for further extraction of salt from the mother liquor using existing equipment such as multi-effect evaporators, membrane separation devices (such as nanofiltration membranes and reverse osmosis membranes), and centrifugal dehydrators, thus achieving full recovery of salt resources.

[0041] In summary, after a single heating and crystallization cycle, the mother liquor is not directly discharged into external equipment. Instead, it is retained in the outer casing 13 and mixed with the next batch of new wastewater for reheating. The core advantage of this method is reducing the processing load and operating costs of the external equipment. The mother liquor remaining after a single crystallization cycle has a high salt concentration but a small volume. If it is directly discharged into external equipment for treatment, frequent start-ups and shutdowns are required, and the small volume of high-concentration mother liquor can easily cause blockages in the external equipment's pipelines or fluctuations in treatment efficiency. However, by mixing the mother liquor with the new wastewater, most of the salt can be recovered in advance through the evaporation and crystallization process of this device, significantly reducing the total amount of mother liquor entering the external equipment. This not only improves the salt resource recovery efficiency of the entire system but also extends the service life of the external equipment, while ensuring the continuity and stability of the overall treatment process.

[0042] Alternatively, depending on actual usage requirements, the mother liquor can be directly discharged after one cycle and transported to external equipment for separate processing. This embodiment does not impose any limitations, further improving the applicability of the present invention.

[0043] A conical cylinder 17 is installed at the upper end of the main cylinder 1. Inside the conical cylinder 17, there is a trapping unit 4 for trapping impurities such as liquid droplets and fine salt particles in the gas. An exhaust pipe 18 that communicates with the interior of the conical cylinder 17 is installed in the middle of the conical cylinder 17.

[0044] The gas containing impurities such as droplets and fine salt particles generated by the heating and evaporation of wastewater enters the upper conical cylinder 17 of the main cylinder 1. After being intercepted and purified by the internal interception unit 4, the impurities are retained, and the pure gas is discharged from the exhaust pipe 18 in the middle of the conical cylinder 17, ensuring the cleanliness of the discharge.

[0045] Reference Figure 2 and Figure 3 As shown, this is the stirring unit 2 used for stirring wastewater. Specifically, the stirring unit 2 includes a bidirectional motor 20, a cone 21, a stirring plate 22, and a vertical plate 23. The interior of the rhomboid plate 11 has an installation cavity, and the two sides of the installation cavity are respectively connected to the upper and lower outer walls of the rhomboid plate 11. The bidirectional motor 20 is mounted on the inner wall of the installation cavity through a motor base. The two main shafts of the bidirectional motor 20 extend to the upper and lower outer walls of the rhomboid plate 11 and are equipped with cones 21. Several stirring plates 22 are evenly distributed along their axes and in contact with the outer side of the rhomboid plate 11 on the outside of the cones 21. The ends of the stirring plates 22 extend to the edge of the rhomboid plate 11 and are equipped with vertical plates 23.

[0046] After the bidirectional motor 20 starts, its two main shafts drive the stirring plate 22 to rotate via the pointed cone 21, stirring the wastewater in the main cylinder 1 to ensure uniform heating. Simultaneously, the stirring plate 22 prevents crystals from adhering to the outer wall of the rhombus plate 11. The vertical plate 23 at the end of the stirring plate 22 contacts the inner wall of the main cylinder 1, scraping off crystals from the inner wall during rotation. After the rhombus plate 11 rotates 180 degrees, the stirring plate 22 at the top takes over the crystallization stirring task. The stirring plate 22 at the bottom continues to function while the bidirectional motor 20 is running, without affecting subsequent stirring operations, and can also scrape off any crystals adhering to the bottom of the rhombus plate 11 by rotating and scraping its outer side.

[0047] Reference Figure 4 and Figure 5 As shown, the support assembly 3 is used to drive the rhombus plate 11 to rotate. Specifically, the support assembly 3 includes a rectangular cavity 30, a support motor 31, a spring rod 32, and a contact plate 33. The rectangular cavity 30 is symmetrically opened inside the rhombus plate 11, and one end of the rectangular cavity 30 extends to the outside of the rhombus plate 11. The support motor 31 is installed inside the rectangular cavity 30 through a motor base. The spring rod 32 is installed at the telescopic end of the support motor 31, and the contact plate 33, which abuts against the inner wall of the main cylinder 1, is installed at the telescopic end of the spring rod 32.

[0048] In the initial state, the extension end of the spring rod 32 drives the contact plate 33 to abut against the inner wall of the main cylinder 1, forming initial support and positioning for the rhombus plate 11; because the edge of the rhombus plate 11 has a circular structure and is in close contact with the inner wall of the main cylinder 1, the rhombus plate 11 can maintain a stable state without flipping over.

[0049] After the single heating crystallization process is completed, the rhombus plate 11 is driven downward by external force until it descends to the area between the two support legs 10. At this time, the contact plate 33 moves out of the main cylinder 1 range along with the rhombus plate 11 and contacts the inner side of the corresponding support leg 10. The contact plates 33 on both sides together form a stable support for the rhombus plate 11 to prevent the rhombus plate 11 from falling off between the support legs 10.

[0050] At this time, the outer side of the rhomboid plate 11 is no longer in contact with the inner wall of the main cylinder 1, and the flipping limit constraint is released. Then the support motor 31 is started and the main shaft of the support motor 31 rotates. However, at this time, the contact between the contact plate 33 and the inner side of the support leg 10 makes the contact plate 33 not rotate synchronously. Therefore, the rotation torque will be transmitted back to the body of the support motor 31. At this time, the body of the support motor 31 will drive the rhomboid plate 11 to rotate 180 degrees between the support legs 10 through the rectangular cavity 30 in order to carry out the subsequent crystallization and recycling operation.

[0051] After the crystallization and recycling are completed, the rhomboid plate 11 is moved upward and reset to the inside of the main cylinder 1 by external force. The contact plate 33 then re-contacts and adheres to the inner wall of the main cylinder 1, restoring the supporting and positioning state of the rhomboid plate 11.

[0052] It should be noted that the spring rod 32 used in this implementation is a conventional axial sliding spring telescopic rod in the prior art. The telescopic shaft of the spring rod 32 can only slide along the axial direction and cannot rotate relative to the main body. This structural feature can ensure that the torque output of the main shaft of the support motor 31 is transmitted without loss and avoid torque loss due to the rotation gap between the telescopic shaft and the rod body, thereby ensuring the stable drive of the rhomboid plate 11 flipping action.

[0053] Reference Figure 6 and Figure 7 As shown, the interception unit 4 is used to intercept impurities such as liquid droplets and fine salt particles in the gas. Specifically, the interception unit 4 includes a mounting ring 40, an annular ring 41, and a wire mesh demister 42. The mounting ring 40 is installed on the inner wall of the conical cylinder 17 by means of a threaded connection. Several annular rings 41 are installed on the internal threads of the mounting ring 40, which are vertically distributed along its extension. A conical wire mesh demister 42 is installed on the inner diameter of the annular ring 41.

[0054] During wastewater heating, a large number of bubbles are generated. When these bubbles rise to the liquid surface and burst, they splash the surrounding saline wastewater into tiny droplets. Simultaneously, some incompletely crystallized ultrafine salt particles remain suspended in the wastewater. These droplets and particles are carried away by the rising steam flow, resulting in impurities in the gas. The impurity-laden gas flows upward into the conical cylinder 17 and passes sequentially through multiple vertically distributed annular rings 41 within the mounting ring 40, and conical wire mesh demisters 42 installed within each annular ring 41. The conical wire mesh demister 42 is the core functional component for gas phase impurity purification in this equipment. It is made of porous mesh fiber, and its conical structure increases the contact area with the airflow, improving impurity capture. Furthermore, gravity guides the intercepted impurities back quickly, preventing accumulation and clogging on the wire mesh surface. The multi-layered, vertically distributed layout forms a tiered purification structure, capable of intercepting impurities of different particle sizes, ensuring effective gas phase purification.

[0055] Large particles of impurities carried in the airflow, due to their high density and strong inertia, cannot change their trajectory synchronously with the airflow when passing through the mesh at high speed. They will directly collide with the surface of the mesh fibers and be trapped. Meanwhile, tiny droplets and fine salt particles generated by the bursting of bubbles will be intercepted by the mesh fibers. Among them, particles with a diameter slightly larger than the mesh pores will be directly blocked when flowing through the pores and cannot pass through. Particles with a smaller diameter will come into contact with the mesh fibers and be adsorbed and trapped.

[0056] The various impurities trapped will gradually accumulate on the surface of the wire mesh, and under the influence of gravity, they will agglomerate into larger droplets, flowing downwards along the inner wall of the conical wire mesh, and eventually flowing back into the wastewater system inside the main cylinder 1. This design not only achieves the separation of impurities and steam, ensuring that the gas discharged through the exhaust pipe 18 in the middle of the conical cylinder 17 meets the cleanliness standards, but also returns the trapped impurities back into the main cylinder 1, preventing impurity loss, improving the recovery rate of subsequent salt crystallization, and reducing the operating load of impurities on external pipelines and treatment equipment.

[0057] Reference Figure 7 As shown, it includes a horizontal plate 43 and an L-shaped groove 430. The horizontal plate 43 is installed on one side of the vertical plate 23, and several L-shaped grooves 430 corresponding to the vertical plate 23 are opened on the outer side of the mounting ring 40. The width of the vertical section of the L-shaped groove 430 is consistent with the combined width of the vertical plate 23 and the horizontal plate 43, and the width of the horizontal section of the L-shaped groove 430 is consistent with the width of the horizontal plate 43.

[0058] After prolonged use, the wire mesh demister 42 accumulates excessive impurities and needs timely replacement. During replacement, the diamond-shaped plate 11 is driven upwards, causing the vertical plate 23 to drive the horizontal plate 43 into the vertical section of the L-shaped groove 430. Then, the bidirectional motor 20 operates, indirectly driving the vertical plate 23 and the horizontal plate 43 to rotate, causing the horizontal plate 43 to be inserted into the horizontal section of the L-shaped groove 430. Continued rotation causes the vertical plate 23 and the horizontal plate 43 to synchronously drive the mounting ring 40 to rotate within the conical cylinder 17. During this rotation, the diamond-shaped plate 11 descends synchronously, allowing the mounting ring 40 to be removed from the conical cylinder 17 via a threaded connection. Subsequently, the diamond-shaped plate 11 indirectly drives the mounting ring 40 and the wire mesh demister 42 inside it to descend between the support legs 10, then rotates the mounting ring 40 180 degrees, aligning it with the ground. At this point, the horizontal plate 43 is limited by the horizontal section of the L-shaped groove 430, preventing the mounting ring 40 from falling to the ground.

[0059] The operator rotates the mounting ring 40 in the reverse direction, causing the horizontal plate 43 to disengage from the transverse section of the L-shaped groove 430, thus removing the mounting ring 40. Then, the annular ring 41 is rotated by its threads to remove the wire mesh demister 42 from the mounting ring 40, and a new wire mesh demister 42 is installed. The vertical plate 23 and the horizontal plate 43 are then inserted into the L-shaped groove 430, with the horizontal plate 43 remaining in the transverse section. Finally, the diamond plate 11 rotates the mounting ring 40 180 degrees, so that the mounting ring 40 faces the conical cylinder 17. The diamond plate 11 then rises, aligning the mounting ring 40 with the bottom of the conical cylinder 17. The stirring plate 22 rotates the mounting ring 40 in the reverse direction, while the diamond plate 11 rises synchronously, allowing the mounting ring 40 to be re-threaded into the conical cylinder 17.

[0060] The advantage of this approach is that during routine multi-crystallization operations, no additional shutdown maintenance procedures are required. Only an upward movement is needed after the diamond plate 11 completes a single crystallization descent and unloading, simultaneously lowering the wire mesh demister 42 to the ground operating height. Operators do not need to climb to disassemble the internal components of the conical cylinder 17; they can directly replace or clean the wire mesh demister 42 from the ground, significantly reducing maintenance time. New or cleaned wire mesh demisters 42 can be quickly reinstalled and immediately put into subsequent crystallization processes, ensuring continuous and stable operation of the entire system and improving overall operational efficiency.

[0061] Example 2: Refer to Figure 2 , Figure 4 and Figure 5 As shown, based on Embodiment 1, in order to drive the rhomboid plate 11 to move up and down, a drive unit 5 is installed in the main cylinder 1 and the support leg 10. Specifically, the drive unit 5 includes a sliding groove 50, a drive groove 51, a sliding magnetic plate 52, a drive motor 53, and a drive screw 54. The sliding groove 50 is opened on the side of the support leg 10 facing the axis of the main cylinder 1. The bottom of the main cylinder 1 has a chamfer corresponding to the sliding groove 50. The drive groove 51 is opened between the main cylinder 1 and the support leg 10. The sliding magnetic plate 52 is slidably installed in the drive groove 51. The drive motor 53 is installed at the bottom of the drive groove 51. The drive screw 54 is connected to the main shaft of the drive motor 53 through a coupling. The end of the drive screw 54 passes through the sliding magnetic plate 52 and is threadedly connected. A passive magnetic plate (not shown in the figure) corresponding to the sliding magnetic plate 52 is installed inside the contact plate 33.

[0062] The drive motor 53 drives the drive screw 54 to rotate, and the drive screw 54 drives the sliding magnetic plate 52 to move up and down in the drive groove 51. During the movement, the sliding magnetic plate 52, through the magnetic force cooperation with the passive magnetic plate in the corresponding abutment plate 33, indirectly drives the rhomboid plate 11 to move between the main cylinder 1 and the support leg 10. In the initial state, the sliding magnetic plate 52 can apply a supporting force to the rhomboid plate 11 through the passive magnetic plate, preventing the rhomboid plate 11 from falling accidentally and reducing the load-bearing capacity of the spring rod 32 and the abutment plate 33.

[0063] The chamfered structure at the bottom of the main cylinder 1 guides the contact plate 33 to move smoothly from inside the main cylinder 1 into the sliding groove 50, and from the sliding groove 50 back into the main cylinder 1. During this process, the sliding magnetic plate 52 can further limit the axial movement of the rhombus plate 11 through the passive magnetic plate, preventing the contact plate 33 from slipping and ensuring that it always corresponds to the position of the sliding groove 50. After the contact plate 33 moves into the sliding groove 50, the inner wall of the sliding groove 50 acts as a limiting and guiding force for the contact plate 33. Therefore, when the support motor 31 is running, the contact plate 33 will not rotate within the sliding groove 50, ensuring that the torque can be stably transmitted to the rhombus plate 11, thereby driving the support motor 31 to drive the rhombus plate 11 to complete the flipping action.

[0064] During operation: First, the external water supply equipment delivers wastewater to the outer sleeve 13 through the inlet pipe 15. The electric control valve 14 is opened, and the wastewater flows into the main cylinder 1 through the through groove 12 and is supported by the diamond plate 11.

[0065] The second step involves starting the heating components to heat and evaporate the wastewater in the main cylinder 1. Simultaneously, the bidirectional motor 20 of the stirring unit 2 is started, driving the stirring plate 22 to stir the wastewater. The vertical plate 23 scrapes the inner wall of the main cylinder 1 to prevent crystallization and adhesion. The gas containing impurities generated by evaporation is purified by the interception unit 4 in the conical cylinder 17, and the pure gas is discharged from the exhaust pipe 18.

[0066] The third step is to stop heating and let it stand after the crystallization is completed. The driving unit 5 drives the rhomboid plate 11 to the position of the through groove 12. The mother liquor flows into the outer sleeve 13 for storage along the inclined surface of the rhomboid plate 11 through the through groove 12.

[0067] The fourth step involves driving the rhomboid plate 11 down to between the support legs 10. The contact plate 33 of the support component 3 contacts and limits the contact with the support legs 10. The support motor 31 is then started to rotate the rhomboid plate 11 180 degrees, and the crystallized material falls off by gravity to complete the unloading.

[0068] Fifth step, drive the rhomboid plate 11 back into the main cylinder 1, and the external water supply equipment will again deliver new wastewater to mix with the mother liquor in the outer cylinder 13, repeating the above heating, stirring, crystallization, mother liquor discharge and unloading process.

[0069] Step 6: After all crystallization tasks are completed, the remaining mother liquor in the outer sleeve 13 is extracted and collected through the drain pipe 16. If the wire mesh demister 42 needs maintenance, the vertical plate 23, the horizontal plate 43 and the L-shaped groove 430 are used to drive the mounting ring 40 and the wire mesh demister 42 down to the ground to complete the replacement or cleaning and then reset.

[0070] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and not restrictive.

[0071] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A zero-discharge evaporation crystallization device for salt chemical wastewater, comprising a main cylinder (1), characterized in that: Two support legs (10) are symmetrically installed at the bottom of the main cylinder (1). A rhomboid plate (11) that narrows from the middle to the sides is slidably installed inside the main cylinder (1). A stirring unit (2) for stirring wastewater is installed inside the rhomboid plate (11). The diamond plate (11) is also equipped with support components (3) on both sides for driving it to flip. Two arc-shaped through grooves (12) are symmetrically opened on the inner wall of the main cylinder (1), and an outer sleeve (13) is also fitted on the outer side of the main cylinder (1). The interior of the outer sleeve (13) is connected to the interior of the main cylinder (1) through the through grooves (12). An electrically controlled valve (14) for connecting the interior of the main cylinder (1) and the outer sleeve (13) is also installed on the inner wall of the main cylinder (1). An inlet pipe (15) and a drain pipe (16) connected to the interior of the outer sleeve (13) are respectively installed on the outer side of the outer sleeve (13).

2. The zero-discharge evaporation crystallization device for salt chemical wastewater according to claim 1, characterized in that: The stirring unit (2) includes an installation cavity opened inside the rhomboid plate (11), and the two sides of the installation cavity are respectively connected to the upper and lower outer walls of the rhomboid plate (11). The bidirectional motor (20) is installed on the inner wall of the installation cavity through the motor base. The two main shafts of the bidirectional motor (20) extend to the upper and lower outer walls of the rhomboid plate (11) and are equipped with pointed cones (21). Several stirring plates (22) are evenly distributed along their axis and in contact with the outer side of the rhomboid plate (11) on the outside of the pointed cones (21).

3. The zero-discharge evaporation crystallization device for salt chemical wastewater according to claim 2, characterized in that: The end of the stirring plate (22) extends to the edge of the rhomboid plate (11) and is fitted with a vertical plate (23).

4. The zero-discharge evaporation crystallization device for salt chemical wastewater according to claim 1, characterized in that: The support assembly (3) includes two rectangular cavities (30) symmetrically opened inside the rhomboid plate (11), and one end of the rectangular cavity (30) extends to the outside of the rhomboid plate (11). A support motor (31) is installed inside the rectangular cavity (30) through a motor seat. A spring rod (32) is installed at the telescopic end of the support motor (31). A contact plate (33) that abuts against the inner wall of the main cylinder (1) is installed at the telescopic end of the spring rod (32).

5. The zero-discharge evaporation crystallization device for salt chemical wastewater according to claim 1, characterized in that: A conical tube (17) is installed at the upper end of the main tube (1). Inside the conical tube (17) is a trapping unit (4) for trapping impurities such as liquid droplets and fine salt particles in the gas. An exhaust pipe (18) that communicates with the interior of the conical tube (17) is installed in the middle of the conical tube (17).

6. The zero-discharge evaporation crystallization device for salt chemical wastewater according to claim 5, characterized in that: The interception unit (4) includes a mounting ring (40) installed on the inner wall of the conical cylinder (17). The mounting ring (40) has several annular rings (41) vertically distributed along its extension section installed on its internal threads. A conical wire mesh demister (42) is installed on the inner diameter of the annular rings (41).

7. The zero-discharge evaporation crystallization device for salt chemical wastewater according to claim 6, characterized in that: The mounting ring (40) is threadedly connected to the inner wall of the conical cylinder (17).

8. A zero-discharge evaporation crystallization device for salt chemical wastewater according to claim 3 or 6, characterized in that: A horizontal plate (43) is installed on one side of the vertical plate (23), and several L-shaped grooves (430) corresponding to the vertical plate (23) are opened on the outer side of the mounting ring (40).

9. The zero-discharge evaporation crystallization device for salt chemical wastewater according to claim 8, characterized in that: The width of the vertical section of the L-shaped groove (430) is consistent with the combined width of the vertical plate (23) and the horizontal plate (43), and the width of the horizontal section of the L-shaped groove (430) is consistent with the width of the horizontal plate (43).

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