Concentrated solution crystallization equipment capable of continuously working

Abstract

Concentrated solution crystallizing equipment capable of continuously working comprises a box body, a liquid inlet, a liquid outlet, a liquid inlet, a liquid outlet and a liquid outlet, the bottom of the box body is an inclined surface bottom plate; a material shifting device is arranged above the inclined plane bottom plate; the material stirring device is arranged above the inclined surface bottom plate, and crystals separated out of the concentrated solution in the box body are stirred from the bottom to the top and then are discharged from the discharge hole; the box body is provided with a liquid level keeping mechanism, the set liquid level enables the bottom end part of the inclined plane bottom plate to be immersed in the concentrated solution, and the rear end part of the inclined plane bottom plate is exposed out of the liquid level; a temperature adjusting device is also arranged inside or outside the box body and is used for heating or cooling the concentrated solution in the box body so as to crystallize the concentrated solution. The equipment disclosed by the invention is high in operation automation degree and free from blockage risk.

Description

Technical Field

[0001] The invention belongs to concentrated liquid crystallization equipment, in particular to a concentrated liquid crystallization equipment which can work continuously. Background Art

[0002] The sludge treatment process is to separate the solid residue and the filtrate after the screen, flocculation and dehydration processes, and the filtrate treatment methods that are widely used are mainly the concentrate reinjection method, advanced oxidation method, evaporation method and membrane distillation method, but the above methods have their own shortcomings. For example, the concentrate reinjection method has the risk of groundwater pollution and increases the moisture content and salt content of the landfill layer; the advanced oxidation method has a slow degradation rate for the total organic matter content in the concentrate and has little effect on the ionic substances in the concentrate. The addition of a large amount of oxidizing agents also increases the treatment cost of the concentrate; the membrane cost of the membrane distillation method is high, the distillation flux is small, and the operating state is unstable due to the influence of temperature polarization and concentration polarization. In addition, membrane distillation is a phase change process, and heat is mainly transferred in the form of heat conduction, so the efficiency is low, generally only about 30%; evaporation is the most thorough treatment method, but the traditional evaporation method requires high energy consumption and complex equipment structure, making it difficult to work continuously, and it is impossible to separate crystals with a lower moisture content at one time.

[0003] For example, Chinese invention patent 202010219411.5 discloses a multi-effect evaporation concentration crystallizer and an evaporation concentration crystallization method, wherein the multi-effect evaporation concentration crystallizer includes a switchable evaporation concentration crystallization tank group, which is composed of a crystallizer X and a crystallizer Y; a heat exchange coil X is placed in the crystallizer X, and a heat exchange coil Y is placed in the crystallizer Y, and the front ends of the heat exchange coil X and the heat exchange coil Y are connected to the external steam supply through a pipe with a valve; the inner cavity of the crystallizer X is connected to the front end of the heat exchange coil Y through a pipe with a valve; the inner cavity of the crystallizer Y is connected to the front end of the heat exchange coil X through a pipe with a valve. The salt solution evaporation crystallization method is applied to the multi-effect evaporation concentration crystallizer. The structure and control of the equipment used in this method are complex, and it is difficult to avoid the scaling of the crystals on the outer wall of the heat exchange coil. The crystals pile up at the bottom, which easily causes the outlet to be blocked.

[0004] Chinese invention patent 202010018964.4 discloses a method for evaporation, concentration and segmented crystallization of landfill leachate R0 concentrate, wherein the RO concentrate after deep softening and organic matter purification pretreatment is first evaporated and concentrated by an MVR evaporator, and then evaporated and crystallized by a forced circulation MVR evaporator, and the crystals are washed and dried to obtain industrial-grade sodium chloride, and the crystallization mother liquor is further cooled and crystallized, and the obtained crystals are washed and dried to obtain industrial-grade potassium chloride. In this method, due to the coexistence of crystals and liquids, it is necessary to use a centrifugal dehydrator to dehydrate and obtain crystals with a lower water content, which is complex in process and has high operating costs.

[0005] Chinese invention patent 201811052412.4 discloses a waste incineration waste heat recovery evaporation crystallization waste leachate concentrate process, the flue gas generated by the waste incineration boiler enters the flue gas heat exchanger; the waste leachate concentrate in the concentrated water tank is transported to the first plate heat exchanger, the second plate heat exchanger, the flue gas heat exchanger, and the flash tank by a water pump in sequence, the flash steam discharged from the upper end of the flash tank passes through the second plate heat exchanger and the first plate heat exchanger in sequence to heat the waste leachate concentrate, the upper clear liquid in the flash tank is transported by a circulating pump to the pipeline between the first plate heat exchanger and the second plate heat exchanger to merge with the waste leachate concentrate and be transported together with the waste leachate concentrate, the flue gas discharged from the flue gas heat exchanger passes through the desulfurization and deacidification device and the dust collector in sequence and is discharged from the chimney. There is only one crystallization tank in this process, and it cannot be operated continuously. If continuous operation is required, two crystallization tanks need to be switched, which will cause complex structure and high cost. The operation mode of this process is: fill the crystallization tank once and heat continuously. When filled, it needs to be heated to boiling in the early stage. During the gradual evaporation process, part of the heating tube will be exposed to the air, resulting in a waste of heat energy. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a concentrated liquid crystallization device which can work continuously, has a high degree of operation automation and has no risk of clogging.

[0007] The present invention is achieved in that: A continuously working concentrated liquid crystallization device comprises: a box body, the box body having a feed inlet and a discharge outlet; The bottom of the box is an inclined bottom plate; A material-dispensing device is disposed above the inclined bottom plate; The material-push device is arranged above the bottom plate of the inclined surface, and pushes the crystals precipitated from the concentrated liquid in the box from the bottom to the top and then discharges them from the discharge port; The box body is provided with a liquid level maintaining mechanism, the liquid level of which is set so that the bottom end portion of the inclined bottom plate is immersed in the concentrated liquid, and the rear end portion is exposed to the liquid surface; A temperature regulating device is also provided inside or outside the box body, which is used to heat or cool the concentrated liquid in the box body to make it crystallize.

[0008] Furthermore, the material-pickling device comprises: a prying and sweeping mechanism and a driving mechanism connected thereto; The sweeping mechanism is arranged above the bottom plate of the inclined surface and parallel to it; The driving mechanism is mounted on two opposite side walls of the box body and is located above the sweeping mechanism; The driving mechanism drives the sweeping mechanism to perform reciprocating synchronous circular motion, so that the sweeping mechanism periodically approaches the inclined surface bottom plate, touches the crystals on the inclined surface bottom plate, sweeps the crystals to the top of the inclined surface bottom plate and then discharges them.

[0009] Furthermore, the sweeping mechanism comprises: a plurality of parallel and longitudinally arranged angle steels, and a plurality of parallel and transversely arranged sweeping plates plugged into the bottoms of the angle steels.

[0010] Further, the driving mechanism includes: a transmission mechanism, a guide plate, and a group of driving shafts; the group of driving shafts is passed through the guide plate through a group of eccentric devices mounted thereon; the sweeping mechanism is fixedly connected to the guide plate; the group of driving shafts is mounted on the two side walls of the box body, and is connected to a power source arranged outside the box body through the transmission mechanism; the group of driving shafts is driven by the power source to rotate at the same speed and in the same direction, driving the guide plate and the sweeping mechanism to perform reciprocating synchronous circular motion, so that the sweeping mechanism periodically approaches the bottom plate of the inclined surface.

[0011] Furthermore, the temperature regulating device is a plate-type temperature regulator, which is arranged in the box and immersed below the liquid surface; The plate-type thermostat comprises: a plurality of plate-type fluid channel components interconnected and arranged in parallel at intervals, wherein a dirt wiping unit for reciprocating motion is arranged in the gaps between the plates, and the dirt wiping unit continuously reciprocates in the gaps to prevent fouling on the side walls of the fluid channel components and cause blockage; The dirt wiping unit is fixedly connected to a group of fixing rods, and the fixing rods are fixedly connected to the guide plate.

[0012] Furthermore, the temperature regulating medium flowing in the temperature regulating device is a heating fluid, or a heating refrigerant flowing out of a heat pump compressor, which increases the temperature of the concentrated liquid in the box and evaporates to precipitate crystals; the concentrated liquid crystallization equipment is an evaporation crystallization box.

[0013] Furthermore, the box is a sealed box, which is connected to a vacuum generator to form a negative pressure in the box, so that the concentrated liquid boils and vaporizes at a low boiling point.

[0014] Furthermore, the temperature regulating medium flowing in the temperature regulating device is a refrigeration fluid, or a refrigeration refrigerant flowing out of a heat pump expansion valve, so that the temperature of the concentrated liquid in the box is reduced to cool and precipitate crystals; the concentrated liquid crystallization equipment is a cooling crystallization box.

[0015] Furthermore, the front feed port of the cooling crystallization box is also connected to the liquid outlet of an evaporation concentration tank, and the bottom of the cooling crystallization box is provided with a liquid discharge port connected to the feed port of the evaporation concentration tank.

[0016] Furthermore, the front feed port of the cooling crystallization box is also connected to the liquid outlet of an evaporation crystallization box, and the bottom of the cooling crystallization box is provided with a liquid discharge port connected to the feed port of the evaporation crystallization box.

[0017] The advantages of the present invention are: 1. This equipment is a device that continuously evaporates or cools and discharges crystals. The concentrated liquid enters from the feed port and is discharged from the discharge port. Its operating conditions and state can remain continuously stable.

[0018] 2. The plate-type thermostat has a wide range of temperature control media options, which can improve the efficiency of evaporation or cooling, making it more energy-efficient and efficient.

[0019] 3. The feeding device is immersed under the liquid surface, which also has a stirring effect, promotes heat transfer and uniform heating, accelerates the movement of solute and solvent molecules, prevents the local concentration of the concentrated liquid from being too high, and reduces the adhesion, scaling and deposition of solutes on the feeding device.

[0020] 4. After the crystals are swept by the material-dispensing device to the bottom plate of the inclined surface and exposed to the liquid surface, the excess liquid is allowed to flow back into the box along the bottom plate of the inclined surface. Especially in the case of evaporation crystallization, the rear end is still continuing to evaporate, and the dryness of the crystals is easier to ensure.

[0021] 5. The equipment has a simple structure and is easy to control. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0023] Figure 1 Schematic diagram of the appearance of the first embodiment of the present invention (without the box cover).

[0024] Figure 2 It is a schematic diagram of the explosion structure of the first embodiment of the present invention.

[0025] Figure 3 It is a front view of the first embodiment of the present invention using a heat pump for heating.

[0026] Figure 4 It is a front view of the first embodiment of the present invention using hot water or steam for heating.

[0027] Figure 5 It is a front view of the second embodiment of the present invention.

[0028] Figure 6 It is a front view of the third embodiment of the present invention.

[0029] Figure 7 It is a front view of the fourth embodiment of the present invention.

[0030] Reference numerals: 1-box body, 2-feeding port, 3-discharging port, 4-trough body, 5-collecting bin, 6-inclined bottom plate, 7-discharging device, 8-screw conveyor, 9-double gate valve discharging device, 10-liquid level meter, 111-plate thermostat, 112-smearing unit, 12-sweeping mechanism, 121-angle steel, 122-sweeping plate, 13-transmission mechanism, 14-guide plate, 15-drive shaft, 16-eccentric bearing, 17-drive motor, 18-magnetic coupling assembly, 19-vacuum generator, 20-condensing device, 21-thermometer, 22-pressure gauge, 23-evaporation concentration tank, 31-box cover. DETAILED DESCRIPTION

[0031] The first embodiment, evaporation crystallization box: like Figures 1 to 4 As shown, a concentrated liquid crystallization device capable of continuous operation, as an evaporation crystallization box, comprises: a box body 1, the box body 1 is provided with a feed inlet 2 and a discharge port 3; The box body 1 includes: a trough body 4 and a collection bin 5 connected thereto; the trough body 4 is used to contain the concentrated liquid, and the bottom of the trough body 4 is an inclined bottom plate 6; the top of the inclined bottom plate 6 is connected to the upper part of the collection bin 5; a material discharging device 7 is arranged above the inclined bottom plate 6; the bottom of the collection bin 5 outputs the crystals to the outside of the discharge port 3 through a screw conveyor 8, and the driving motor of the screw conveyor 8 is connected to the screw shaft through a magnetic coupling assembly 18. A double-gate valve discharge device 9 is provided at the discharge port 3. The double-gate valve discharge device 9 adopts the double-gate sealing mechanism in Chinese utility model patent 202022821704.9. Only when one of the valves is fully closed, the other valve completes an opening and closing action. The two valves operate alternately to ensure a good sealing effect.

[0032] The material-pick-up device 7 is arranged above the inclined bottom plate 6, and pushes the crystals precipitated from the concentrated liquid in the tank body 4 from the bottom to the top and then falls into the collecting bin 5, and the crystals in the collecting bin 5 are discharged from the discharge port 3; The tank body 4 is provided with a liquid level maintaining mechanism (a liquid level gauge 10 in this embodiment), the liquid level of which is set so that the bottom end portion of the inclined bottom plate 6 is immersed in the concentrated liquid, and the rear end portion is exposed to the liquid surface; The material-pickup device 7 comprises: a prying and sweeping mechanism 12 and a driving mechanism connected thereto; The sweeping mechanism 12 is arranged above the inclined bottom plate 6 and is arranged parallel thereto; The driving mechanism is mounted on two opposite side walls of the box body 1 and is located above the sweeping mechanism 12; The driving mechanism drives the sweeping mechanism 12 to perform reciprocating synchronous circular motion, so that the sweeping mechanism 12 periodically approaches the inclined surface bottom plate 6, touches the crystals on the inclined surface bottom plate 6 and sweeps the crystals to the top of the inclined surface bottom plate 6, and then the crystals fall into the collecting bin 5.

[0033] The sweeping mechanism 12 comprises: a plurality of parallel angle steels 121 arranged in a longitudinal direction (the longitudinal direction here refers to the direction in which the bottom end of the inclined bottom plate 6 moves toward the top end), and a plurality of parallel sweeping plates 122 arranged in a transverse direction (a direction perpendicular to the longitudinal direction) plugged into the bottom of the angle steels 121. The distance between each two adjacent sweeping plates 122 is equal to or less than the circumferential diameter of the reciprocating synchronous circular motion.

[0034] The driving mechanism includes: a transmission mechanism 13, a guide plate 14, and a group of driving shafts 15; a group of driving shafts 15 are inserted into the guide plate 14 through a group of eccentric bearings 16 sleeved thereon; the sweeping mechanism 12 is fixedly connected to the guide plate 14; a group of driving shafts 15 are mounted on the two side walls of the box body 1, and are connected to a power source arranged outside the box body 1 through the transmission mechanism 13; a group of driving shafts 15 rotate at the same speed and in the same direction under the drive of the power source, driving the guide plate 14 and the sweeping mechanism 12 to perform reciprocating synchronous circular motion, so that the sweeping mechanism 12 periodically approaches the inclined surface bottom plate 6. The power source is a driving motor 17, and the driving motor 17 is connected to the driving shaft 15 through a magnetic coupling assembly 18.

[0035] A temperature control device is also provided in the box body 1, which is used to heat the concentrated liquid in the tank body 4 to make it crystallize. The temperature control device in this embodiment adopts a plate-type temperature control device 111 and a dirt wiping unit 112 in a plate-type temperature control device proposed in the Chinese invention patent application No. 202411756085.6. The dirt wiping unit 112 continuously reciprocates in the gap of the plate-type temperature control device 111 to prevent the scale on the side wall from causing blockage; wherein the dirt wiping unit 112 and the sweeping mechanism 12 share a set of driving mechanisms, and the dirt wiping unit 112 is fixedly connected to a set of fixed rods 113, and the fixed rods 113 are fixedly connected to the guide plate 14. The dirt wiping unit 112 and the sweeping mechanism 12 synchronously make reciprocating circular motions.

[0036] The temperature control medium can be the heating refrigerant flowing out of the heat pump compressor (such as Figure 3 ), or hot water or steam (as shown Figure 4 As shown), even sewage, sludge or waste liquid with higher temperature on site, the temperature of the concentrated liquid in the tank body 4 is increased to evaporate and precipitate crystals.

[0037] The box body 1 in this embodiment is a closed box body, which is connected to a vacuum generator 19 to form a negative pressure in the box body 1, so that the concentrated liquid boils and vaporizes at a low boiling point. The front end or rear end of the vacuum generator 19 is connected to a condensing device 20 (the refrigeration refrigerant flowing out of the heat pump expansion valve is transported to the condensing device 20). When the vacuum generator 19 achieves negative pressure, a thermometer 21 and a pressure gauge 22 are provided on the box body 1.

[0038] Working process of evaporation crystallization box: Under the control of the liquid level meter 10, the high-concentration concentrated liquid that is easy to crystallize after evaporation is pumped from the feed inlet 2 into the tank body 4 with the inclined bottom plate 6; The heating medium flows in the pipe of the plate thermostat 111 and continuously releases heat, continuously heating the liquid in the tank body 4; The vacuum generator 19 forms a negative pressure in the box 1, so that the liquid in the box 1 boils and vaporizes at a relatively low temperature; the water vapor condenses into water and is discharged after being cooled; During the vaporization process, crystals are continuously precipitated and settled to the bottom of the tank body 4, and then the crystals are swept from the lower part of the inclined bottom plate 6 to the higher part and out of the liquid surface by the material-dispensing device 7. The stirring of the material-dispensing device 7 promotes heat transfer and uniform heating in the concentrated liquid, accelerates the movement of solute and solvent molecules, prevents the local concentration of the concentrated liquid from being too high, and reduces the adhesion, scaling and deposition of solutes on the plate-type thermostat 111 and the material-dispensing device 7. The residual liquid on the crystals that are pushed out of the liquid surface flows back into the tank body 4 along the inclined lower plate 6; and the crystals that are swept upwards will further evaporate the residual liquid under the heating of the heated inclined bottom plate 6; The material-dispensing device 7 makes the concentrated liquid relatively uniform and the heat relatively even by stirring, and can also continuously crush the crystals in time to prevent the formation of large blocks, and transport them to a higher place along the inclined bottom plate 6 and drop them into the collecting bin 5; The crystals collected in the collecting bin 5 are conveyed to the discharge port 3 by the screw conveyor 8, and are discharged to the outside through the sealed double-gate valve discharge device 9 while ensuring that the box is in a closed state.

[0039] Evaporation crystallization box is generally suitable for the following types of materials: 1. Substances whose solubility does not change much with temperature: such as sodium chloride, etc., by evaporating the solvent, a large amount of solute crystals can be precipitated. 2. Substances with high solubility and stability at high temperature: such substances can maintain good chemical stability during the evaporation process. 3. Materials that need to recover solid products from solutions: such as some chemical products, inorganic salts, etc. 4. Separate a specific solute from a mixed solution containing multiple solutes: use the difference in solubility of different solutes for evaporation and crystallization separation.

[0040] Second embodiment, cooling crystallization box: like Figure 5 As shown, the difference between this embodiment and the first embodiment is that the temperature regulating medium flowing in the plate-type thermostat 111 is a refrigerant fluid, or a refrigerant flowing out of a heat pump expansion valve, so that the temperature of the concentrated liquid in the box body 1 is reduced to cool and precipitate crystals.

[0041] Working process of cooling crystallization box: Under the control of the liquid level meter 10, the concentrated liquid is pumped from the feed port 2 into the tank body 4 having the inclined bottom plate 6; The refrigerant medium flows in the pipe of the plate thermostat 111 to continuously cool the liquid in the tank 4; The crystals continue to precipitate and settle to the bottom of the tank 4, and then the material-push device 7 sweeps the crystals from the lower part of the inclined bottom plate 6 to the higher part and pushes them out of the liquid surface; The residual liquid on the crystals on the liquid surface is pushed out and flows back into the tank body 4 along the inclined lower plate 6; The material-dispensing device 7 makes the concentrated liquid relatively uniform in concentration and temperature by stirring, and can also continuously crush the crystals in time to prevent the formation of large blocks, and transport them to a higher place along the inclined bottom plate 6 and drop them into the collecting bin 5; The crystals collected in the collecting bin 5 are conveyed to the discharge port 3 by the screw conveyor 8, and discharged to the outside through the double gate valve discharge device 9 under the premise of ensuring that the box is in a closed state.

[0042] Cooling crystallization box is suitable for the following materials: 1. Saturated solution after heating and evaporation; 2. Substances whose solubility changes greatly with temperature: such as potassium nitrate, which has high solubility at high temperature and significantly reduced solubility at low temperature, is suitable for crystallization of solutes by cooling; 3. Some substances that are easily decomposed or deteriorated by heat: these substances cannot be crystallized by high-temperature evaporation, but can be separated by cooling crystallization at a relatively low temperature; 4. Extraction of temperature-sensitive substances from solutions: such substances can be better separated by cooling crystallization within a specific temperature range; 5. Some materials that need to obtain higher-purity crystalline products: the cooling crystallization process can better control crystal growth and obtain purer and more regular crystals.

[0043] The third embodiment, evaporation concentration tank + cooling crystallization box: like Figure 6 As shown, the difference between this embodiment and the second embodiment is that an evaporation concentration tank 23 is connected to the front end of the cooling crystallization box, and after the material is evaporated and concentrated, the liquid part is sent to the cooling crystallization box for cooling crystallization, and the liquid after cooling and crystallization is sent to the feed port of the evaporation concentration tank 23 through the discharge port at the bottom of the tank body 4 of the cooling crystallization box for circulation treatment.

[0044] In this embodiment, the evaporation concentration tank and the cooling crystallization box share a heat pump system. The heating refrigerant flowing out of the compressor of the heat pump system flows into the pipe of the tubular heat exchanger of the evaporation concentration tank, and the cooling refrigerant flowing out of the expansion valve of the heat pump system flows into the pipe of the tubular heat exchanger of the cooling crystallization box and is connected to the condensing device of the vacuum generator.

[0045] Fourth embodiment, evaporation crystallization box + cooling crystallization box: like Figure 7 As shown, this embodiment is different from the third embodiment in that the evaporation concentration tank 23 is replaced by the evaporation crystallization box of the first embodiment of the present invention. After the material is evaporated and crystallized, the solid part is directly discharged, and the liquid part is sent to the cooling crystallization box for cooling crystallization. After cooling and crystallization, the liquid is sent to the feed port of the evaporation crystallization box through the discharge port at the bottom of the tank body 4 of the cooling crystallization box for circulation treatment.

[0046] The concentrated liquid crystallization device of the present invention can realize sustainable and continuous operation, has a high degree of automation in operation, and has no risk of clogging.

[0047] The above embodiments and drawings do not limit the form and style of the present invention. Any appropriate changes or modifications made by ordinary technicians in the relevant technical field should be deemed to be within the patent scope of the present invention.

Claims

1. A continuously working concentrated liquid crystallization device, characterized in that: include: A box body, the box body having a feed inlet and a discharge outlet; The bottom of the box is an inclined bottom plate; A material-dispensing device is disposed above the inclined bottom plate; The material-push device is arranged above the bottom plate of the inclined surface, and pushes the crystals precipitated from the concentrated liquid in the box from the bottom to the top and then discharges them from the discharge port; The box body is provided with a liquid level maintaining mechanism, the liquid level of which is set so that the bottom end portion of the inclined bottom plate is immersed in the concentrated liquid, and the rear end portion is exposed to the liquid surface; A temperature regulating device is also provided inside or outside the box body, which is used to heat or cool the concentrated liquid in the box body to make it crystallize.

2. A continuously operable concentrated liquid crystallization device as claimed in claim 1, characterized in that: The material-pickling device comprises: a prying and sweeping mechanism and a driving mechanism connected thereto; The sweeping mechanism is arranged above the bottom plate of the inclined surface and parallel to it; The driving mechanism is mounted on two opposite side walls of the box body and is located above the sweeping mechanism; The driving mechanism drives the sweeping mechanism to perform reciprocating synchronous circular motion, so that the sweeping mechanism periodically approaches the inclined surface bottom plate, touches the crystals on the inclined surface bottom plate, sweeps the crystals to the top of the inclined surface bottom plate and then discharges them.

3. A continuously operable concentrated liquid crystallization device as claimed in claim 2, characterized in that: The sweeping mechanism comprises: a plurality of parallel and longitudinally arranged angle steels, and a plurality of parallel and transversely arranged sweeping plates plugged into the bottom of the angle steels.

4. A continuously operable concentrated liquid crystallization device as claimed in claim 2, characterized in that: The driving mechanism includes: a transmission mechanism, a guide plate, and a group of driving shafts; the group of driving shafts is passed through the guide plate through a group of eccentric devices mounted thereon; the sweeping mechanism is fixedly connected to the guide plate; the group of driving shafts is mounted on the two side walls of the box body, and is connected to a power source arranged outside the box body through the transmission mechanism; the group of driving shafts is driven by the power source to rotate at the same speed and in the same direction, driving the guide plate and the sweeping mechanism to perform reciprocating synchronous circular motion, so that the sweeping mechanism periodically approaches the bottom plate of the inclined surface.

5. A continuously operable concentrated liquid crystallization device as claimed in claim 4, characterized in that: The temperature regulating device is a plate-type temperature regulator, which is arranged in the box and immersed below the liquid surface; The plate-type thermostat comprises: a plurality of plate-type fluid channel components interconnected and arranged in parallel at intervals, wherein a dirt wiping unit for reciprocating motion is arranged in the gaps between the plates, and the dirt wiping unit continuously reciprocates in the gaps to prevent fouling on the side walls of the fluid channel components and cause blockage; The dirt wiping unit is fixedly connected to a group of fixing rods, and the fixing rods are fixedly connected to the guide plate.

6. A continuously operable concentrated liquid crystallization device as claimed in claim 1, characterized in that: The temperature regulating medium flowing in the temperature regulating device is a heating fluid or a heating refrigerant flowing out of a heat pump compressor, which increases the temperature of the concentrated liquid in the box and evaporates to precipitate crystals; the concentrated liquid crystallization equipment is an evaporation crystallization box.

7. A continuously operable concentrated liquid crystallization device as claimed in claim 6, characterized in that: The box is a sealed box, which is connected to a vacuum generator to form a negative pressure in the box, so that the concentrated liquid boils and vaporizes at a low boiling point.

8. A continuously operable concentrated liquid crystallization device as claimed in claim 1, characterized in that: The temperature regulating medium flowing in the temperature regulating device is a refrigeration fluid, or a refrigeration refrigerant flowing out of a heat pump expansion valve, which reduces the temperature of the concentrated liquid in the box and cools and precipitates crystals; the concentrated liquid crystallization equipment is a cooling crystallization box.

9. A continuously operable concentrated liquid crystallization device as claimed in claim 8, characterized in that: The front feed port of the cooling crystallization box is also connected to the liquid outlet of an evaporation concentration tank, and the bottom of the cooling crystallization box is provided with a liquid discharge port connected to the feed port of the evaporation concentration tank.

10. A continuously operable concentrated liquid crystallization device as claimed in claim 8, characterized in that: The front feed port of the cooling crystallization box is also connected to the liquid outlet of an evaporation crystallization box, and the bottom of the cooling crystallization box is provided with a liquid discharge port connected to the feed port of the evaporation crystallization box.

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