A drying zero-emission crystallization collection evaporator for high-salinity wastewater mother liquor

Abstract

The present application relates to wastewater purification device technical field, specifically to a kind of for high-salinity wastewater mother liquor dry zero-emission crystallization collection evaporator, including shell, preheating unit for being arranged in shell interior and for carrying out the pretreatment of wastewater mother liquor, and rotation setting in preheating unit inside and for the crystallization of wastewater after pretreatment crystallization unit;The device of the present application adopts sleeve type integration structure to realize the dry pretreatment evaporation crystallization of wastewater, steam is introduced into heat exchange pipe and exchanges heat with wastewater, improve the utilization rate of steam heat, preliminary dry pretreatment of wastewater, improve the crystallization efficiency of follow-up, steam enters outlet pipe and blows impeller rotation, thereby make gear ring rotate, drive crystallization cylinder rotation, through the gear ring meshing connection's gear disc drive stirring roller rotation, strengthen the uniform heating crystallization of liquid, can effectively promote crystallization process.

Description

Technical Field

[0001] This invention relates to the field of wastewater purification equipment technology, specifically to a drying, zero-discharge crystallization, and collection evaporator for high-salt wastewater mother liquor. Background Technology

[0002] High-salinity wastewater mother liquor is a type of wastewater containing a high concentration of dissolved salts, generated in many industrial sectors such as seawater desalination, salt lake mining, chemical processing, and metallurgy. For environmental protection and sustainable development purposes, the desalination treatment of high-salinity wastewater mother liquor has become an important issue.

[0003] Crystallization is a process that causes solutes in a supersaturated solution to crystallize into solid particles. In the treatment of high-salt wastewater mother liquor, crystallization is widely used to remove dissolved salts. By controlling conditions such as temperature, concentration, and stirring, the solution is brought to a supersaturated state, causing the solute to crystallize into particles, thus effectively removing dissolved salts. Evaporation technology utilizes heat energy to gradually evaporate water from the solution, thereby concentrating the solute. In the treatment of high-salt wastewater mother liquor, evaporation is a key step in removing water from the solution. By providing heat energy, the water in the solution evaporates, forming crystal particles. Selecting appropriate evaporation equipment and optimizing operating parameters, based on the salt concentration of the wastewater and the desired treatment effect, can maximize evaporation efficiency.

[0004] In high-salinity wastewater treatment, the application of waste gas treatment technology is crucial to ensuring environmental and workplace safety. Methods such as absorption, washing, or filtration are used to treat gases generated during evaporation to reduce atmospheric pollution. However, existing evaporators lack recycling capabilities, leading to energy waste. Furthermore, traditional evaporators lack collection and separation functions, hindering the collection of crystals. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the present invention provides a drying, zero-discharge crystallization, and collection evaporator for high-salt wastewater mother liquor.

[0006] The technical solution of the present invention is: a drying zero-discharge crystallization collection evaporator for high-salt wastewater mother liquor, comprising a shell, a preheating unit disposed inside the shell for pretreatment of the wastewater mother liquor, and a crystallization unit rotatably disposed inside the preheating unit for crystallizing the pretreated wastewater; an inlet is provided on the bottom side wall of the shell;

[0007] The preheating unit includes an evaporator cylinder disposed inside the shell, multiple heating elements circumferentially attached to the inner wall of the shell, a vapor-liquid separation plate sleeved on the outer wall of the evaporator cylinder, and a heat exchange tube longitudinally circumferentially sleeved on the outer wall of the evaporator cylinder; a gas valve communicating with the interior of the evaporator cylinder is provided at the top of the shell.

[0008] The vapor-liquid separation plate divides the space between the shell and the evaporation cylinder into upper and lower cavities, and the heat exchange tube is provided with an air inlet at the upper end;

[0009] The evaporator cylinder has a cavity inside its side wall; a water inlet valve communicating with the cavity inside the evaporator cylinder is provided on the bottom side wall of the evaporator cylinder; and an outlet pipe penetrating the evaporator cylinder is provided at the upper end of the heat exchange tube and on the side of the air inlet.

[0010] An outlet pipe communicating with the internal cavity of the evaporator is provided on the inner wall of the evaporator; the outlet pipe is located above the water inlet valve.

[0011] Description: This invention achieves the drying treatment of high-salt wastewater by preheating and crystallizing the mother liquor. The process involves almost no wastewater discharge, significantly reducing environmental impact. Wastewater is introduced into the shell through the inlet and preheated by heating elements on the inner wall of the shell to generate steam. The steam then enters the heat exchange tubes through the air inlet to exchange heat with the wastewater in the lower half of the shell, improving the utilization rate of steam heat. This initial preheating and drying of the wastewater enhances the subsequent crystallization efficiency.

[0012] Furthermore, the crystallization unit includes a crystallization cylinder disposed inside the evaporation cylinder and rotatably connected to the bottom of the evaporation cylinder, a toothed ring disposed at the top of the crystallization cylinder, a gear meshing with the toothed ring and rotatably disposed on the inner wall of the evaporation cylinder via a connecting rod, an impeller coaxial with the gear and located on one side of the gas outlet pipe, and a stirring assembly disposed at the top of the evaporation cylinder.

[0013] The stirring assembly includes multiple toothed discs rotatably mounted on the top of the evaporation cylinder via mounting rods, and stirring rollers corresponding to the bottom of the toothed discs; the toothed discs are meshed with the toothed rings.

[0014] The bottom longitudinal section of the crystallization cylinder is inverted cone-shaped; a discharge valve is provided at the center of the bottom of the crystallization cylinder.

[0015] Explanation: Steam drives the impeller, which rotates the crystallization cylinder. The toothed ring at the top of the crystallization cylinder drives the stirring component to stir the wastewater, ensuring uniform heating and enhancing the crystallization effect.

[0016] Furthermore, the crystallization unit also includes a feeding assembly, which includes an extrusion module fixedly disposed at the top of the evaporation cylinder by a mounting column, and a spraying module disposed at the top of the evaporation cylinder.

[0017] The extrusion module includes a disc fixedly mounted at the top of the evaporation cylinder via a mounting column, an annular rack rotatably mounted at the bottom of the disc, a slider mounted at the bottom of the annular rack, a rotating shaft mounted at the bottom of the disc, and a limiting rod with one end hinged to the rotating shaft and the other end slidably engaged with the slider; the limiting rod is provided with a through groove for slidably engaging with the slider, and an air bladder with one end fixedly connected to the slider is provided inside the through groove; the annular rack meshes with the toothed disc.

[0018] Explanation: The extrusion module squeezes out the crystallizing catalyst from the spraying module and sprays it onto the wastewater in the crystallization cylinder to enhance the crystallization effect; the toothed disc drives the ring rack to rotate, which in turn drives the slider to rotate the limit rod. During the rotation of the limit rod, the slider moves inside the channel, squeezing and stretching the air bladder, thereby providing air pressure to the inside of the spraying module and promoting the spraying of the crystallizing catalyst.

[0019] Furthermore, the spraying module includes a liquid storage chamber and a tube disposed on the liquid storage chamber; the tube is connected to the interior of the liquid storage chamber via a first pressure valve; the tube extends into the bottom of the crystallization cylinder and has multiple nozzles spaced apart on its surface; the liquid storage chamber is connected to the air bladder via a conduit, and the air bladder is provided with a one-way air inlet valve; a one-way air outlet valve is provided between the air bladder and the conduit, and the liquid storage chamber is filled with a crystallization catalyst.

[0020] Explanation: By squeezing the air bladder to provide air pressure to the inside of the spraying module, the pressure inside the liquid storage chamber increases, the first pressure valve opens, and the crystallization catalyst is sprayed out, realizing the automatic intermittent feeding operation of wastewater in the crystallization cylinder.

[0021] Furthermore, a material column extending into the crystallization cylinder is provided at the bottom of the liquid storage chamber. The material column has a cavity communicating with the inside of the liquid storage chamber. The surface of the material column is provided with material dispensing holes at intervals, and a second pressure valve is provided in each material dispensing hole.

[0022] Explanation: Expanding the distribution range of the material by using the material column makes the material distribution more uniform. The material column, which is fixed and extends into the interior of the crystallization cylinder, moves relative to the rotating wastewater in the rotating crystallization cylinder, which can also promote the dispersion of the catalyst.

[0023] Furthermore, a scraper is provided on one side of the bulk material column, which slides in contact with the inner wall of the crystallization cylinder.

[0024] Explanation: The scraper blade removes the crystals that have condensed and adhered to the inner wall of the crystallizing cylinder by moving relative to the rotating crystallizing cylinder, thus promoting discharge.

[0025] Furthermore, the vapor-liquid separation plate includes an annular plate disposed on the outer wall of the evaporator, a plurality of conical through holes disposed on the annular plate, a float ball connected to the inside of the conical through holes by a connecting rope, and a contact sensor disposed on the top of the inner wall of the conical through holes.

[0026] Explanation: When too much wastewater is introduced and the steam output is too low, the float will rise and block the conical through-hole, preventing the wastewater from entering the upper cavity of the shell. The float continues to rise until it contacts the contact sensor on the top of the side wall. At this time, the controller raises the temperature of the heating element inside the shell, enhancing the preheating efficiency, promoting the evaporation process of wastewater, increasing the steam output, automatically regulating the preheating, and saving energy.

[0027] Furthermore, a semiconductor cooling chip is provided on the inner wall of the liquid outlet pipe.

[0028] Explanation: The gas-liquid mixture discharged from the evaporator is cooled into liquid by a semiconductor cooling plate on the inner wall of the liquid outlet pipe, so that the pipe does not dry out and become blocked when it passes through the liquid outlet pipe, which facilitates subsequent crystallization.

[0029] Furthermore, the toothed disc is provided with an infiltration chamber, and the inner wall of the evaporator below the liquid outlet pipe is also provided with a guide plate for guiding wastewater into the infiltration chamber; the mounting rod is provided with a cylindrical cavity, and the side wall of the mounting rod is provided with an opening for communicating between the surface of the guide plate and the interior of the infiltration chamber; the mounting rod is rotatably and sealingly connected to the toothed disc.

[0030] The stirring roller is provided with an electro-separation chamber and a flocculation chamber from top to bottom inside;

[0031] It also includes an electrodialysis crystallization unit, which includes an osmosis aid module disposed inside the osmosis aid chamber, an electro-separation module disposed inside the electro-separation chamber, and a flocculation filtration module disposed inside the flocculation chamber.

[0032] The permeation aid module includes a protrusion disposed on the inner side wall of the permeation aid cavity, a rod disposed on the bottom side wall of the mounting rod and extending into the cylindrical cavity, a first liquid cavity fixedly disposed at the bottom of the rod, and a liquid pusher column slidably and sealingly disposed at both ends of the first liquid cavity.

[0033] The liquid-pushing column is provided with a reset spring that is fixedly connected to the surface of the first liquid cavity.

[0034] The top of the evaporation cylinder is equipped with a box for storing the penetration aid; the first liquid chamber is connected to the box for storing the penetration aid through a pipe and a first one-way valve passing through an installation rod; the interior of the penetration aid chamber is connected to the interior of the electro-separation chamber.

[0035] The blades on the surface of the stirring roller are divided into upper and lower groups; each blade has a cavity inside, and a second one-way valve connected to the top outlet is provided; multiple sets of heating wires are evenly embedded on the surface of the blade.

[0036] The electro-separation module includes an ion-permeable membrane arranged longitudinally within the electro-separation chamber, and an electric field generating device disposed on the inner wall of the electro-separation chamber and located on both sides of the ion-permeable membrane.

[0037] The ion-permeable membrane consists of alternating cation-permeable membranes and anion-permeable membranes; the cation-permeable membranes and anion-permeable membranes can divide the electro-separation chamber into a concentrated water zone and a pure water zone; the bottom of the concentrated water zone is connected to the flocculation chamber through a first electronic valve; the pure water zone is connected to the upper cavity of the fan blade through a pipe and a second electronic valve.

[0038] The flocculation filtration module includes an elastic element disposed at the bottom of the flocculation chamber, a piston block disposed at the top of the elastic element, a weighing sensor disposed on the piston block, a second liquid chamber disposed inside the elastic element, and a valve body disposed on the piston block; a third one-way valve is disposed on the surface of the second liquid chamber, and a box for storing flocculant is disposed inside the flocculation chamber, and the second liquid chamber and the box for storing flocculant are connected by a fourth one-way valve;

[0039] The flocculation chamber is also equipped with a pump body; the flocculation chamber is connected to the lower half cavity of the fan blade through a third electronic valve; a filter plate is also provided at the connection between the flocculation chamber and the lower half cavity of the fan blade; and a drain valve pipe connected to the discharge valve is provided at the bottom of the flocculation chamber.

[0040] Explanation: Wastewater is permeated through an ion-osmosis membrane to become concentrated water and pure water. The ion-osmosis enhancement module enhances the permeation effect. The second liquid chamber is squeezed to allow flocculant to flow out and flocculate the concentrated water. After flocculation, the water that has passed through the filter plate flows out from the top of the lower half of the fan blade cavity and is evaporated and dried by the heating wire. This increases the contact area between the filtered wastewater and the heating wire, accelerating the drying of the wastewater.

[0041] Furthermore, the longitudinal section at the bottom of the permeation aid chamber where it connects to the electro-separation chamber is a sloped water channel;

[0042] A baffle plate is also provided on the rod body via a connecting column. The baffle plate has a fan-shaped cross-section and is located above the water passage. It can slide in contact with the bottom of the seepage aid chamber to intermittently open and close the water passage by rotating the toothed disc.

[0043] Explanation: The relative movement between the baffle and the water channel causes the baffle to intermittently cover the water channel, slowing down the flow rate, prolonging the residence time of wastewater in the seepage aid chamber, and improving the mixing of wastewater and seepage aid.

[0044] Compared with the prior art, the beneficial effects of the present invention are:

[0045] This invention employs a sleeve-type integrated structure to achieve pre-treatment evaporation and crystallization of wastewater, fully utilizing thermal energy and improving evaporation efficiency. Wastewater is introduced into the shell through the inlet and preheated by heating elements on the inner wall of the shell, generating steam. The steam enters the outlet pipe, driving the impeller to rotate, which in turn drives the coaxial gear, causing the gear ring to rotate and thus the crystallization cylinder to rotate, enhancing the heat exchange and crystallization effect. A geared disc, meshing with the gear ring, drives the stirring roller to rotate, stirring the inside of the crystallization cylinder and enhancing uniform heating and crystallization, effectively promoting the crystallization process. The bottom longitudinal section of the crystallization cylinder is inverted conical, facilitating the flow of the crystallized material towards the discharge valve at the center of the bottom of the crystallization cylinder under gravity, making collection and discharge convenient.

[0046] The device of this invention adopts a compact design, with both the crystallization unit and the preheating unit located inside the casing. This effectively utilizes space, reduces the equipment's footprint, and facilitates operation and maintenance. By introducing steam into the heat exchange tubes to exchange heat with the wastewater, the utilization rate of steam heat is improved. The initial drying and preheating of the wastewater can improve the subsequent crystallization efficiency. Through efficient use of energy and heat recovery, the environmental impact can be reduced. Attached Figure Description

[0047] Figure 1 This is a schematic diagram of the external structure of Embodiment 1 of the present invention;

[0048] Figure 2 This is a cross-sectional view of the housing in Embodiment 1 of the present invention;

[0049] Figure 3 This is a schematic diagram of the structure of the vapor-liquid separation plate in Embodiment 1 of the present invention;

[0050] Figure 4 This is a schematic diagram of the structure of the crystallization unit in Embodiment 1 of the present invention;

[0051] Figure 5 This is a cross-sectional view of the evaporator cylinder of Embodiment 1 of the present invention;

[0052] Figure 6 This is a schematic diagram of the stirring assembly in Embodiment 1 of the present invention;

[0053] Figure 7 This is a schematic diagram of the feeding component in Embodiment 1 of the present invention;

[0054] Figure 8 This is a schematic diagram of the structure of the material distribution column and the scraper in Embodiment 2 of the present invention;

[0055] Figure 9 This is a schematic diagram of the flow guide plate in Embodiment 3 of the present invention;

[0056] Figure 10 This is a schematic diagram of the structure of the electrodialysis crystallization unit in Embodiment 3 of the present invention;

[0057] Figure 11 This is a schematic diagram of the overall structure of the penetration aid module in Embodiment 3 of the present invention;

[0058] Figure 12 This is a schematic diagram of the structure of the rod and the first liquid cavity in Embodiment 3 of the present invention;

[0059] Figure 13 This is a cross-sectional view of the internal structure of the gear in Embodiment 3 of the present invention;

[0060] Figure 14 This is a schematic diagram of the structure of the electrical separation module in Embodiment 3 of the present invention;

[0061] Figure 15 This is a schematic diagram of the flocculation filtration module in Embodiment 3 of the present invention;

[0062] Figure 16 This is a schematic diagram of the overall structure of the infiltration aid module in Embodiment 4 of the present invention;

[0063] Figure 17 This is a schematic diagram of the structure of the rod and the first liquid cavity in Embodiment 4 of the present invention;

[0064] Figure 18 This is a cross-sectional view of the internal structure of the gear in Embodiment 4 of the present invention;

[0065] Among them, 1-shell, 2-preheating unit, 21-evaporation cylinder, 211-water inlet valve, 212-liquid outlet pipe, 213-guide plate, 22-heating element, 23-vapor-liquid separation plate, 231-ring plate, 232-conical through hole, 233-float ball, 234-contact sensor, 24-heat exchange tube, 241-air inlet, 2411-air outlet pipe, 242-air outlet, 3-crystallization unit, 31-crystallization cylinder, 32-tooth ring, 33-connecting rod, 34-gear, 35-impeller, 36-stirring assembly, 361-mounting rod, 362-tooth disc, 363-stirring roller, 37-feeding assembly, 371 -Disc, 372-Ring rack, 373-Slider, 374-Rotating shaft, 375-Limiting rod, 3751-Through groove, 3752-Airbag, 376-Liquid storage chamber, 377-Packing column, 3771-Scraper, 4-Electrodialysis crystallization unit, 41-Aid osmosis module, 411-Protrusion, 412-Rod, 413-First liquid chamber, 414-Pushing column, 415-Reset spring, 42-Electro-separation module, 421-Ion permeation membrane, 422-Electric field generating device, 43-Flocculation filtration module, 431-Elastic element, 432-Piston block, 433-Weighing sensor, 434-Second liquid chamber. Detailed Implementation

[0066] The present invention will now be described in more detail with reference to specific embodiments, so as to better demonstrate the advantages of the present invention.

[0067] Example 1

[0068] like Figure 1 , 2 The evaporator shown is a drying zero-discharge crystallization collection evaporator for high-salt wastewater mother liquor, including a shell 1, a preheating unit 2 disposed inside the shell 1 for pretreatment of the wastewater mother liquor, and a crystallization unit 3 rotatably disposed inside the preheating unit 2 for crystallizing the pretreated wastewater; an inlet 11 is provided on the bottom side wall of the shell 1.

[0069] like Figure 2 As shown, the preheating unit 2 includes an evaporator 21 disposed inside the housing 1, a plurality of heating elements 22 circumferentially attached to the inner wall of the housing 1, a vapor-liquid separation plate 23 sleeved on the outer wall of the evaporator 21, and a heat exchange tube 24 longitudinally sleeved on the outer wall of the evaporator 21; a gas valve 12 communicating with the inside of the evaporator 21 is provided at the top of the housing 1.

[0070] like Figure 3 As shown, the vapor-liquid separation plate 23 includes an annular plate 231 disposed on the outer wall of the evaporator 21, a conical through hole 232 disposed on the annular plate 231, a float 233 disposed inside the conical through hole 232 connected by a connecting rope, and a contact sensor 234 disposed on the top of the inner wall of the conical through hole 232; the upper radius of the conical through hole 232 is the same as the radius of the float 233, and the lower radius is larger than the radius of the float 233. In this embodiment, the upper radius of the conical through hole 232 is 0.5cm, the lower radius is 2cm, and the radius of the float 233 is 0.5cm.

[0071] like Figure 3 As shown, the vapor-liquid separation plate 23 divides the shell 1 and the evaporator 21 into upper and lower cavities. The heat exchange tube 24 is provided with an air inlet 241 at its upper end. The evaporator 21 has a cavity inside its side wall. The bottom side wall of the evaporator 21 is provided with a water inlet valve 211 that communicates with the cavity inside the evaporator 21. The upper end of the heat exchange tube 24 and the side of the air inlet 241 are provided with an air outlet pipe 2411 that penetrates the evaporator 21. The liquid outlet pipe 212 is located above the water inlet valve 211.

[0072] An outlet pipe 212 communicating with the internal cavity of the evaporator 21 is provided on the inner wall of the evaporator 21;

[0073] like Figure 4As shown, the crystallization unit 3 includes a crystallization cylinder 31 disposed inside the evaporation cylinder 21 and rotatably connected to the bottom of the evaporation cylinder 21, a toothed ring 32 disposed at the top of the crystallization cylinder 31, a gear 34 meshing with the toothed ring 32 and rotatably disposed on the inner wall of the evaporation cylinder 21 via a connecting rod 33, an impeller 35 coaxial with the gear 34 and located on one side of the gas outlet pipe 2411, and a stirring assembly 36 disposed at the top of the evaporation cylinder 21.

[0074] like Figure 5 , 6 As shown, the stirring assembly 36 includes a plurality of toothed discs 362 rotatably mounted on the top of the evaporation cylinder 21 via mounting rods 361, and stirring rollers 363 correspondingly mounted on the bottom of the toothed discs 362; the toothed discs 362 are engaged with the toothed rings 32.

[0075] The bottom longitudinal section of the crystallizing cylinder 31 is inverted cone-shaped; a discharge valve is provided at the center of the bottom of the crystallizing cylinder 31.

[0076] The crystallization unit 3 also includes a feeding assembly 37, which includes an extrusion module fixedly installed at the top of the evaporation cylinder 21 by a mounting column, and a spraying module installed at the top of the evaporation cylinder 21.

[0077] like Figure 7 As shown, the extrusion module includes a disc 371 fixedly mounted on the top of the evaporator cylinder 21 by a mounting column, an annular rack 372 rotatably mounted on the bottom of the disc 371, a slider 373 mounted on the bottom of the annular rack 372, a rotating shaft 374 mounted on the bottom of the disc 371, and a limiting rod 375 with one end hinged to the rotating shaft 374 and the other end slidably engaged with the slider 373; the limiting rod 375 is provided with a through groove 3751 for slidably engaging with the slider 373, and an air bladder 3752 with one end fixedly connected to the slider 373 is provided inside the through groove 3751; the annular rack 372 is meshed with the rack 362.

[0078] like Figure 5 , 7 As shown, the spraying module includes a liquid storage chamber 376 and a tube body disposed on the liquid storage chamber 376; the tube body is connected to the inside of the liquid storage chamber 376 through a first pressure valve; the tube body extends into the bottom of the crystallization cylinder 31 and has multiple nozzles spaced apart on its surface; the liquid storage chamber 376 is connected to the air bladder 3752 through a conduit, and the air bladder 3752 is provided with a one-way air inlet valve; a one-way air outlet valve is provided between the air bladder 3752 and the conduit, and the liquid storage chamber 376 is filled with a crystallization catalyst.

[0079] It should be noted that this embodiment also includes a power supply and a controller. The power supply, controller, heating element 22, air valve, water inlet valve 211, impeller 35, stirring roller 363, air bag 3752, pipe body, one-way air inlet valve, one-way air outlet valve, crystallization catalyst, float 233, contact sensor 234, and semiconductor refrigeration chip are all commercially available products and will not be described in detail here.

[0080] The working principle of this embodiment is as follows:

[0081] Wastewater is introduced into the housing 1 through the inlet and preheated by the heating element 22 on the inner wall of the housing 1 to generate steam. The steam-liquid separation plate 23 ensures that the upper half of the housing is filled with steam. When too much wastewater is introduced and the steam output is too low, the float 233 will rise and block the conical through hole 232, preventing wastewater from entering the upper half of the housing cavity. The float 233 continues to rise until it contacts the contact sensor 234 on the top of the side wall. At this time, the controller raises the temperature of the heating element 22 inside the housing to enhance the preheating efficiency, promote the evaporation process of wastewater, increase the steam output, automatically regulate the preheating, and save energy.

[0082] Steam exchanges heat with wastewater in the lower half of the shell through inlet 241 and heat exchange tube 24. The wastewater is cooled and liquefied in the internal cavity of evaporator 21. The liquid flows into crystallizer 31 from outlet pipe 212. The flow rate of wastewater into crystallizer 31 is adjusted by inlet valve 211. At the same time, half of the steam enters outlet pipe 2411, blowing impeller 35 to rotate, which drives coaxial gear 34 to rotate, thereby rotating gear ring 32 and driving crystallizer to rotate, enhancing heat exchange and crystallization effect. Gear disc 362, which meshes with gear ring 32, drives stirring roller 363 to rotate, stirring inside crystallizer and enhancing uniform heating and crystallization of liquid. The bottom longitudinal section of crystallizer 31 is inverted cone-shaped, which facilitates the flow of crystallized material to the discharge valve at the bottom center of crystallizer 31 by gravity, making it easy to collect and discharge.

[0083] The toothed disc 362 drives the ring rack 372 to rotate, which in turn drives the slider 373 to rotate the limiting rod 375. During the rotation of the limiting rod 375, the slider 373 moves inside the through groove 3751, squeezing and stretching the air bag 3752, thereby providing air pressure inside the spraying module, increasing the pressure inside the liquid storage chamber 376, opening the first pressure valve, and spraying out the crystallization catalyst, thus realizing the automatic intermittent feeding operation of wastewater in the crystallization cylinder 31.

[0084] Example 2

[0085] The difference between this embodiment and Embodiment 1 is that, Figure 8As shown, a material column 377 extending into the crystallization cylinder 31 is provided at the bottom of the liquid storage chamber 376. A cavity communicating with the inside of the liquid storage chamber 376 is provided inside the material column 377. Material dispensing holes are provided at intervals on the surface of the material column 377. A second pressure valve is provided in the material dispensing hole. A semiconductor cooling chip is provided on the inner wall of the liquid outlet pipe 212.

[0086] A scraper 3771 is provided on one side of the bulk column 377, which slides in contact with the inner wall of the crystallizer 31; both the semiconductor cooling chip and the scraper 3771 are commercially available products.

[0087] Example 3

[0088] The difference between this embodiment and Embodiment 1 is that, Figure 9 , 10 As shown, the toothed disc 362 has an internal permeation chamber, and the inner wall of the evaporator 21 located below the liquid outlet pipe 212 is also provided with a guide plate 213 for guiding wastewater into the permeation chamber; the mounting rod 361 has an internal cylindrical cavity, and the side wall of the mounting rod 361 is provided with an opening for communicating between the surface of the guide plate 213 and the inside of the permeation chamber; the mounting rod 361 is rotatably and sealingly connected to the toothed disc 362;

[0089] The stirring roller 363 has an electro-separation chamber and a flocculation chamber arranged from top to bottom inside;

[0090] like Figure 10 , 11 As shown, it also includes an electrodialysis crystallization unit 4, which includes an osmosis aid module 41 disposed inside the osmosis aid chamber, an electro-separation module 42 disposed inside the electro-separation chamber, and a flocculation filtration module 43 disposed inside the flocculation chamber.

[0091] like Figure 12 , 13 As shown, the permeation aid module 41 includes a protrusion 411 disposed on the inner side wall of the permeation aid cavity, a rod 412 disposed on the bottom side wall of the mounting rod 361 and extending into the cylindrical cavity, a first liquid cavity 413 fixedly disposed at the bottom of the rod 412, and a liquid pusher column 414 slidably and sealingly disposed at both ends of the first liquid cavity 413; the surface of the first liquid cavity 413 is provided with a liquid outlet hole.

[0092] It is understandable that the upper end of the rod 412 is connected to the side wall of the bottom of the mounting rod 361, which does not affect the flow of wastewater into the cylindrical cavity inside the mounting rod 361;

[0093] A return spring 415 is fixedly connected to the surface of the first liquid chamber 413 on the liquid push column 414;

[0094] An evaporator 21 has a box for storing a penetration aid on its top; the first liquid chamber 413 is connected to the box for storing the penetration aid through a pipe and a first one-way valve passing through the mounting rod 361; the inside of the penetration aid chamber is connected to the inside of the electro-separation chamber; wherein, the first one-way valve is a pressure one-way valve, and the one-way flow direction is: one-way flow from the box for storing the penetration aid to the first liquid chamber 413;

[0095] like Figure 10 , 14 As shown, the fan blades on the surface of the stirring roller 363 are divided into upper and lower groups; each fan blade has a cavity inside, and a second one-way valve connected to it is provided at the top outlet; multiple sets of heating wires are evenly embedded on the surface of the fan blade; the one-way flow direction of the second one-way valve is: one-way flow from the cavity inside the fan blade to the outside.

[0096] like Figure 14 As shown, the electro-separation module 42 includes an ion-permeable membrane 421 longitudinally disposed in the electro-separation chamber, and an electric field generating device 422 disposed on the inner sidewall of the electro-separation chamber and located on both sides of the ion-permeable membrane 421.

[0097] The ion-permeable membrane consists of alternating cation-permeable membranes and anion-permeable membranes; the cation-permeable membranes and anion-permeable membranes can divide the electro-separation chamber into a concentrated water zone and a pure water zone; the bottom of the concentrated water zone is connected to the flocculation chamber through a first electronic valve; the pure water zone is connected to the upper cavity of the fan blade through a pipe and a second electronic valve.

[0098] like Figure 15 As shown, the flocculation filtration module 43 includes an elastic element 431 disposed at the bottom of the flocculation chamber, a piston block 432 disposed at the top of the elastic element 431, a weighing sensor 433 disposed on the piston block, a second liquid chamber 434 disposed inside the elastic element 431, and a valve body 435 disposed on the piston block 432; a third one-way valve is disposed on the surface of the second liquid chamber 434, and a box for storing flocculant is disposed inside the flocculation chamber, and the second liquid chamber 434 is connected to the box for storing flocculant through a fourth one-way valve;

[0099] The flow direction of the third check valve is: unidirectional flow from the inside of the second liquid chamber 434 to the outside; the flow direction of the fourth check valve is: unidirectional flow from the box containing the flocculant to the inside of the second liquid chamber 434.

[0100] The flocculation chamber is also equipped with a pump body; the flocculation chamber is connected to the lower half cavity of the fan blade through a third electronic valve; a filter plate 436 is also installed at the connection between the flocculation chamber and the lower half cavity of the fan blade; a drain valve pipe connected to the discharge valve is installed at the bottom of the flocculation chamber.

[0101] Among them, the heating wire, cation permeation membrane, anion permeation membrane, elastic element 431, first check valve, first electronic valve, second electronic valve, valve body, third check valve, fourth check valve, and drain valve pipe are all commercially available products; the penetration aid is commercially available triacetylglycerol, and the flocculant is commercially available polyaluminum chloride.

[0102] The working principle of this embodiment is as follows: Wastewater flows from the outlet pipe 212 into the guide plate 213, enters the cylindrical cavity inside the open mounting rod 361, and flows downward into the permeation aid cavity inside the toothed disc 362. Due to the relative movement of the first liquid chamber 413 and the protrusion 411, the push column 414 is squeezed to release liquid, and the permeation aid flows out. The wastewater enters the electro-separation chamber and permeates into concentrated water and pure water through the ion permeation membrane. The second electronic valve is opened at regular intervals to allow pure water to enter the upper half cavity of the fan blade. The pure water is evaporated and dried by the electric heating wire on the surface of the fan blade. The first electronic valve is opened at regular intervals to allow concentrated water to flow into the flocculation chamber. The second liquid chamber 434 is squeezed to allow the flocculant to flow out and flocculate the concentrated water. After flocculation, the water that has passed through the filter plate flows out from the top of the lower half cavity of the fan blade and is evaporated and dried. When the weighing sensor 433 detects that the weight has not decreased after a period of drainage, the drain valve is opened to discharge the sludge that has been flocculated excessively.

[0103] Example 4

[0104] The difference between this embodiment and Embodiment 1 is that, Figure 16 , 17 As shown in Figure 18, the longitudinal section at the bottom of the infiltration chamber where it connects with the electro-separation chamber is a sloped water channel 3621.

[0105] A baffle plate 416 is also provided on the rod body 412 via a connecting column. The cross-section of the baffle plate 416 is fan-shaped. The baffle plate 416 is located above the water passage 3621 and can slide in contact with the bottom of the seepage aid cavity to intermittently open and close the water passage 3621 by rotating the toothed disc 362.

Claims

1. A drying zero liquid discharge crystallization collection evaporator for high salt wastewater mother liquor, characterized in that, The application relates to a wastewater treatment device, which comprises a shell (1), a preheating unit (2) arranged in the shell (1) and used for pre-treating wastewater mother liquor, and a crystallization unit (3) arranged in the preheating unit (2) and used for crystallizing the pre-treated wastewater; a liquid inlet (11) is arranged on the bottom side wall of the shell (1); The preheating unit (2) comprises an evaporation cylinder (21) arranged in the shell (1), a plurality of electric heating fins (22) circumferentially arranged on the inner side wall of the shell (1), a vapor-liquid separation plate (23) sleeved on the outer side wall of the evaporation cylinder (21), and a heat exchange pipe (24) longitudinally and circumferentially sleeved on the outer side wall of the evaporation cylinder (21); a gas valve (12) is arranged on the top of the shell (1) and communicates with the inside of the evaporation cylinder (21); The vapor-liquid separation plate (23) divides the space between the shell (1) and the evaporation cylinder (21) into two cavities; the upper end of the heat exchange pipe (24) is provided with a gas inlet (241); The inside of the side wall of the evaporation cylinder (21) is provided with a cavity; a water inlet valve (211) is arranged on the bottom side wall of the evaporation cylinder (21) and communicates with the cavity in the evaporation cylinder (21); the upper end of the heat exchange pipe (24) is provided with a gas outlet pipe (2411) penetrating through the evaporation cylinder (21) and located on the side of the gas inlet (241); A liquid outlet pipe (212) is arranged on the inner side wall of the evaporation cylinder (21) and communicates with the cavity in the evaporation cylinder (21); the liquid outlet pipe (212) is located above the water inlet valve (211); The crystallization unit (3) comprises a crystallization cylinder (31) arranged in the evaporation cylinder (21) and rotationally connected with the bottom of the evaporation cylinder (21), a tooth ring (32) arranged on the top of the crystallization cylinder (31), a gear (34) rotationally arranged on the inner side wall of the evaporation cylinder (21) and engaged with the tooth ring (32) through a connecting rod (33), an impeller (35) coaxial with the gear (34) and located on the side of the gas outlet pipe (2411), and a stirring assembly (36) arranged on the top of the evaporation cylinder (21) and provided with an upper end.

2. A zero liquid discharge crystallization collection evaporator for high salinity wastewater mother liquor as claimed in claim 1, wherein, The stirring assembly (36) comprises a plurality of toothed discs (362) rotationally arranged on the top of the evaporation cylinder (21) through mounting rods (361), and a plurality of stirring rollers (363) arranged on the bottom of the toothed discs (362) one by one; the toothed discs (362) are engaged with the tooth ring (32); The bottom of the crystallization cylinder (31) is in an inverted conical shape; A discharging valve is arranged at the center of the bottom of the crystallization cylinder (31).

3. A zero liquid discharge crystallization harvesting evaporator for high salinity wastewater mother liquor as claimed in claim 2, wherein, The crystallization unit (3) further comprises a feeding assembly (37), which comprises an extrusion module fixedly arranged on the top of the evaporation cylinder (21) through a mounting column, and a spraying module arranged on the top of the evaporation cylinder (21). The extrusion module comprises a disc (371) fixedly arranged at the top of the evaporation cylinder (21) through a mounting column, an annular rack (372) rotatably arranged at the bottom of the disc (371), a sliding block (373) arranged at the bottom of the annular rack (372), a rotating shaft (374) arranged at the bottom of the disc (371), and a limiting rod (375) hingedly connected to one end of the rotating shaft (374) and slidably connected to the other end of the sliding block (373); the limiting rod (375) is provided with a through groove (3751) for slidably connecting with the sliding block (373), and the through groove (3751) is internally provided with an air bag (3752) fixedly connected to the sliding block (373); the annular rack (372) is in meshing connection with the tooth disc (362).

4. A zero liquid discharge crystallization harvesting evaporator for high salinity wastewater mother liquor as claimed in claim 3, wherein, The spraying module comprises a liquid storage cavity (376) and a pipe arranged on the liquid storage cavity (376); the pipe is connected with the inside of the liquid storage cavity (376) through a first pressure valve; the pipe extends to the bottom of the crystallization cylinder (31), and a plurality of spray heads are arranged on the surface of the pipe at intervals; the liquid storage cavity (376) is connected with the air bag (3752) through a conduit, and the air bag (3752) is provided with a one-way air inlet valve; a one-way air outlet valve is arranged between the air bag (3752) and the conduit, and the liquid storage cavity (376) is filled with a crystallization catalyst.

5. A zero liquid discharge crystallization harvesting evaporator for high salinity wastewater mother liquor as claimed in claim 4, wherein, The liquid storage cavity (376) is provided with a bulk material column (377) extending into the crystallization cylinder (31), the bulk material column (377) is internally provided with a cavity in communication with the inside of the liquid storage cavity (376), the surface of the bulk material column (377) is provided with bulk material holes at intervals, and the bulk material holes are provided with second pressure valves.

6. A zero liquid discharge crystallization harvesting evaporator for high salinity wastewater mother liquor as claimed in claim 5, wherein, The bulk material column (377) is provided with a dirt scraping plate (3771) in sliding contact with the inner side wall of the crystallization cylinder (31).

7. A zero liquid discharge crystallization harvesting evaporator for high salinity wastewater mother liquor as claimed in claim 1, wherein, The vapor-liquid separation plate (23) comprises an annular plate (231) arranged on the outer side wall of the evaporation cylinder (21), a plurality of conical through holes (232) arranged on the annular plate (231), a floating ball (233) connected in the conical through hole (232) through a connecting rope, and a touch sensor (234) arranged on the inner side wall of the conical through hole (232).

8. A zero liquid discharge crystallization harvesting evaporator for high salinity wastewater mother liquor as claimed in claim 1, wherein, A semiconductor refrigerating sheet is arranged on the inner wall of the liquid outlet pipe (212).

9. A zero liquid discharge crystallization harvesting evaporator for high salinity wastewater mother liquor as claimed in claim 2, wherein, The tooth disc (362) is internally provided with a permeation assisting cavity, and the inner side wall of the evaporation cylinder (21) below the liquid outlet pipe (212) is further provided with a flow guide plate (213) for guiding the wastewater into the permeation assisting cavity; the mounting rod (361) is internally provided with a cylindrical cavity, and the side wall of the mounting rod (361) is provided with an opening for connecting the surface of the flow guide plate (213) and the inside of the permeation assisting cavity; the mounting rod (361) is in rotatable and sealed connection with the tooth disc (362). The inside of the stirring roller (363) is sequentially provided with an electric separation cavity, a flocculation cavity from top to bottom. It also comprises an electrodialytic crystallization unit (4) which comprises an osmotic module (41) arranged inside the osmotic cavity, an electric separation module (42) arranged inside the electric separation cavity, and a flocculation filtration module (43) arranged inside the flocculation cavity; The osmotic module (41) comprises a protrusion (411) arranged on the inner side wall of the osmotic cavity, a rod body (412) arranged on the bottom side wall of the mounting rod (361) and extending into the cylindrical cavity, a first liquid cavity (413) fixedly arranged on the bottom of the rod body (412), and a liquid pushing column (414) slidingly and sealingly arranged at both ends of the first liquid cavity (413); The liquid pushing column (414) is provided with a reset spring (415) fixedly connected with the surface of the first liquid cavity (413); The evaporation cylinder (21) is provided with a box for storing an osmotic agent on the top inside; the first liquid cavity (413) is connected with the box for storing the osmotic agent through a pipeline and a first one-way valve passing through the mounting rod (361); the inside of the osmotic cavity is communicated with the inside of the electric separation cavity; The blades on the surface of the stirring roller (363) are divided into two groups, upper and lower; the inside of the blades are provided with cavities, and the top outlets are provided with second one-way valves in communication therewith; the surfaces of the blades are uniformly embedded with multiple groups of electric heating wires; The electric separation module (42) comprises an ion permeable membrane (421) longitudinally arranged in the electric separation cavity, and an electric field generating device (422) arranged on the inner side wall of the electric separation cavity and located on both sides of the ion permeable membrane (421); The ion permeable membrane is a cation permeable membrane and an anion permeable membrane arranged in an alternating manner; the cation permeable membrane and the anion permeable membrane can divide the electric separation cavity into a concentrated water area and a pure water area; the concentrated water area is communicated with the flocculation cavity through a first electronic valve; the pure water area is communicated with the upper half cavity of the blade through a pipeline and a second electronic valve; The flocculation filtration module (43) comprises an elastic member (431) arranged at the bottom of the flocculation cavity, a piston block (432) arranged on the top of the elastic member (431), a weighing sensor (433) arranged on the piston block, a second liquid cavity (434) arranged in the elastic member (431), and a valve body (435) arranged on the piston block (432); the surface of the second liquid cavity (434) is provided with a third one-way valve; the inside of the flocculation cavity is provided with a box for storing a flocculating agent; the second liquid cavity (434) is connected with the box for storing the flocculating agent through a fourth one-way valve; The inside of the flocculation cavity is also provided with a pump body; the flocculation cavity is communicated with the lower half cavity of the blade through a third electronic valve; the communication part of the flocculation cavity and the lower half cavity of the blade is also provided with a filter plate (436); the bottom of the flocculation cavity is provided with a blowdown valve pipe communicated with the discharge valve.

10. A zero liquid discharge crystallization harvesting evaporator for high salinity wastewater mother liquor as claimed in claim 9, wherein, The longitudinal section of the bottom of the osmotic cavity and the communication part of the electric separation cavity is a water channel (3621) with a slope; The rod body (412) is further provided with a baffle (416) through a connecting column, the cross section of the baffle (416) is a sector, the baffle (416) is located above the water channel (3621) and can slide contact with the inner bottom of the permeation assisting cavity for intermittently opening and closing the water channel (3621) by rotating the toothed disc (362).

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