A continuously operating concentrated liquid crystallization device

Abstract

A continuously operating concentrate crystallization device includes: a housing having an inlet and an outlet; a bottom plate with an inclined surface at the bottom of the housing; a material-pushing device positioned above the inclined surface at the bottom, which pushes the crystals precipitated from the concentrate in the housing from the bottom to the top and discharges them from the outlet; the housing is equipped with a liquid level maintaining mechanism, which sets the liquid level so that the bottom portion of the inclined surface at the bottom is submerged in the concentrate, while the rear portion is exposed above the liquid surface; a temperature regulating device is also provided inside or outside the housing for heating or cooling the concentrate in the housing to induce crystallization. The device of this invention features a high degree of automation and eliminates the risk of clogging.

Description

Technical Field

[0001] This invention pertains to concentrated liquid crystallization equipment, specifically a continuously operating concentrated liquid crystallization equipment. Background Technology

[0002] The sludge treatment process involves separating solid residue and filtrate through processes such as screening, flocculation, and dewatering. Commonly used methods for filtrate treatment include concentrate reinjection, advanced oxidation, evaporation, and membrane distillation. However, each method has its drawbacks. For example, concentrate reinjection poses a risk of groundwater pollution and increases the water and salinity of landfill layers. Advanced oxidation processes have a slow degradation rate of total organic matter in the concentrate and are not very effective against ionic substances; the addition of large amounts of oxidizing agents also increases the treatment cost. Membrane distillation has high membrane costs, low distillation flux, and unstable operation due to temperature and concentration polarization. Furthermore, membrane distillation involves a phase change, and heat is primarily transferred through conduction, resulting in low efficiency, typically around 30%. Evaporation is the most thorough treatment method, but traditional evaporation methods require high energy consumption, have complex equipment structures, are difficult to operate continuously, and cannot separate crystals with lower water content in a single step.

[0003] For example, Chinese invention patent 202010219411.5 discloses a multi-effect evaporation concentration crystallizer and an evaporation concentration crystallization method. The multi-effect evaporation concentration crystallizer includes a switchable evaporation concentration crystallization tank group, which consists of crystallization tank X and crystallization tank Y. Crystallization tank X contains a heat exchange coil X, and crystallization tank Y contains a heat exchange coil Y. The front ends of both heat exchange coil X and heat exchange coil Y are connected to external steam supply via pipes with valves. The inner cavity of crystallization tank X is connected to the front end of heat exchange coil Y via a pipe with a valve. The inner cavity of crystallization tank Y is connected to the front end of heat exchange coil X via a pipe with a valve. The salt solution evaporation crystallization method is applied to the multi-effect evaporation concentration crystallizer. However, the structure and control of the equipment used in this method are complex, making it difficult to avoid scaling of crystals on the outer wall of the heat exchange coils. The crystals accumulate at the bottom, easily causing outlet blockage.

[0004] Chinese invention patent 202010018964.4 discloses a method for evaporation, concentration, and segmented crystallization of landfill leachate RO concentrate. The RO concentrate, after deep softening and organic matter purification pretreatment, is first concentrated by evaporation in an MVR evaporator, and then crystallized by evaporation in a forced circulation MVR evaporator. The crystals are washed and dried to obtain industrial-grade sodium chloride. The mother liquor is further cooled and crystallized, and the resulting crystals are washed and dried to obtain industrial-grade potassium chloride. Because crystals and liquid coexist in this method, centrifugal dehydrators are needed to remove water and obtain crystals with lower water content, making the process complex and costly to operate.

[0005] Chinese invention patent 201811052412.4 discloses a process for recovering waste heat from waste incineration through evaporation and crystallization of leachate concentrate. In this process, flue gas from the waste incineration boiler enters a flue gas heat exchanger. The leachate concentrate in the concentrate tank is pumped sequentially to a first plate heat exchanger, a second plate heat exchanger, a flue gas heat exchanger, and a flash tank. Flash steam discharged from the top of the flash tank passes through the second and first plate heat exchangers to heat the leachate concentrate. The clear liquid at the top of the flash tank is pumped by a circulating pump to the pipeline between the first and second plate heat exchangers, where it merges with the leachate concentrate and is transported along with it. The flue gas discharged from the flue gas heat exchanger passes through a desulfurization and deacidification device and a dust collector before being discharged from the chimney. This process uses only one crystallization tank, making continuous operation impossible. Continuous operation would require switching between two crystallization tanks, resulting in a complex structure and high cost. The proposed method involves filling the crystallization tank once and continuously heating it. When the container is full, it needs to be heated to boiling point initially. However, during the gradual evaporation process, the heating element will be partially 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 continuously operating concentrated liquid crystallization device, which has a high degree of automation and no risk of blockage.

[0007] This invention is implemented as follows:

[0008] A continuously operating concentrated liquid crystallization device includes: a housing having an inlet and an outlet;

[0009] The bottom of the box is an inclined bottom plate;

[0010] A feeding device is provided above the inclined bottom plate;

[0011] The feeding device is located above the inclined bottom plate and feeds the crystals precipitated from the concentrate in the box from the bottom to the top and then discharged from the outlet.

[0012] The tank is equipped with a liquid level maintaining mechanism, which sets the liquid level so that the bottom part of the inclined bottom plate is submerged in the concentrated liquid, while the rear part is exposed above the liquid surface.

[0013] A temperature control device is also provided inside or outside the box to heat or cool the concentrated liquid inside the box to cause it to crystallize.

[0014] Furthermore, the feeding device includes: a feeding mechanism and a drive mechanism connected thereto;

[0015] The sweeping mechanism is positioned above the inclined bottom plate and is parallel to it;

[0016] The drive mechanism is mounted on two opposite side walls of the housing, located above the sweeping mechanism;

[0017] The driving mechanism drives the sweeping mechanism to perform reciprocating synchronous circular motion, so that the sweeping mechanism periodically approaches the inclined bottom plate, touches the crystals on the inclined bottom plate, and sweeps the crystals to the top of the inclined bottom plate before discharging them.

[0018] Furthermore, the sweeping mechanism includes: a plurality of longitudinally arranged angle steels arranged in parallel, and a plurality of transversely arranged sweeping plates inserted into the bottom of the angle steels.

[0019] Furthermore, the driving mechanism includes: a transmission mechanism, a guide plate, and a set of drive shafts; the set of drive shafts passes through the guide plate via a set of eccentric devices sleeved on it; the sweeping mechanism is fixedly connected to the guide plate; the set of drive shafts is mounted on the two side walls of the housing and connected to a power source located outside the housing via the transmission mechanism; the set of drive shafts rotates at the same speed and in the same direction under the drive of the power source, driving the guide plate and the sweeping mechanism to perform reciprocating synchronous circular motion, so that the sweeping mechanism periodically approaches the inclined bottom plate.

[0020] Furthermore, the temperature control device is a plate-type temperature controller, which is installed inside the tank and immersed below the liquid surface;

[0021] The plate thermostat includes: multiple plate fluid channel assemblies that are interconnected and arranged in parallel at intervals, with a descaling unit that performs reciprocating motion in the gaps between them. The descaling unit continuously performs reciprocating motion in the gaps to prevent scale buildup on the sidewalls of the fluid channel assemblies and prevent blockage.

[0022] The cleaning unit is fixedly connected to a set of fixed rods, and the fixed rods are fixedly connected to the guide plate.

[0023] Furthermore, the temperature regulating medium flowing within the temperature regulating device is a heating fluid or a heating refrigerant flowing from a heat pump compressor, which raises the temperature of the concentrated liquid inside the box and causes it to evaporate and precipitate crystals; the concentrated liquid crystallization equipment is an evaporation crystallization box.

[0024] Furthermore, the chamber is a sealed chamber connected to a vacuum generator, which creates a negative pressure inside the chamber, causing the concentrate to boil and vaporize at a low boiling point.

[0025] Furthermore, the temperature regulating medium flowing within the temperature regulating device is a refrigerant or a refrigerant flowing from the heat pump expansion valve, which lowers the temperature of the concentrate in the chamber and cools it to precipitate crystals; the concentrate crystallization equipment is a cooling crystallization chamber.

[0026] Furthermore, the front inlet of the cooling crystallization box is also connected to the outlet of an evaporation and concentration tank, and the bottom of the cooling crystallization box is provided with a drain outlet connected to the inlet of the evaporation and concentration tank.

[0027] Furthermore, the front feed inlet 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 drain outlet connected to the feed inlet of the evaporation crystallization box.

[0028] The advantages of this invention are:

[0029] 1. This equipment is a device for continuous evaporation or cooling and discharge of crystals. The concentrated liquid enters from the feed port and exits from the discharge port, and its operating conditions and status can be kept continuously stable.

[0030] 2. Plate thermostats offer a wide selection of temperature-regulating media, which can improve the efficiency of evaporation or cooling, making them more energy-efficient and effective.

[0031] 3. The material feeding device is submerged in the liquid, which also has a stirring effect, promotes heat transfer and uniform heating, accelerates the movement of solute and solvent molecules, prevents excessively high local concentration of the concentrate, and reduces the adhesion, scaling and deposition of solute on the material feeding device.

[0032] 4. After the crystals are pushed to the bottom plate of the inclined surface by the feeding device and exposed above the liquid surface, the excess liquid is allowed to flow back into the tank along the bottom plate of the inclined surface. Especially in the case of evaporation crystallization, the rear end is still evaporating, and the dryness of the crystals is more easily guaranteed.

[0033] 5. The equipment has a simple structure and is easy to control. Attached Figure Description

[0034] The present invention will now be further described with reference to the accompanying drawings and embodiments.

[0035] Figure 1 This is a schematic diagram of the appearance of the first embodiment of the present invention (with the lid removed).

[0036] Figure 2 This is an exploded structural diagram of the first embodiment of the present invention.

[0037] Figure 3 This is a front view of the first embodiment of the present invention, which uses a heat pump for heating.

[0038] Figure 4 This is a front view of the first embodiment of the present invention, which uses hot water or steam for heating.

[0039] Figure 5 This is a front view of the second embodiment of the present invention.

[0040] Figure 6 This is the front view of the third embodiment of the present invention.

[0041] Figure 7 This is the front view of the fourth embodiment of the present invention.

[0042] Figure label:

[0043] 1-Box body, 2-Inlet, 3-Outlet, 4-Tank body, 5-Collection bin, 6-Inclined bottom plate, 7-Material feeding device, 8-Screw conveyor, 9-Double gate valve discharge device, 10-Level gauge, 111-Plate thermostat, 112-Scaling 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 coupler assembly, 19-Vacuum generator, 20-Condensation device, 21-Thermometer, 22-Pressure gauge, 23-Evaporation and concentration tank, 31-Box cover. Detailed Implementation

[0044] First embodiment, evaporation crystallization box:

[0045] like Figures 1 to 4 As shown, a continuously operating concentrated liquid crystallization device, as an evaporation crystallization box, includes: a box body 1, the box body 1 being provided with a feed inlet 2 and a discharge outlet 3;

[0046] The housing 1 includes: a tank 4 and a collection bin 5 connected thereto; the tank 4 is used to hold the concentrated liquid, and the bottom of the tank 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 feeding device 7 is provided above the inclined bottom plate 6; the bottom of the collection bin 5 outputs the crystals to the outlet 3 through a screw conveyor 8, the drive motor of the screw conveyor 8 is connected to the screw shaft through a magnetic coupler assembly 18, and a double gate valve discharge device 9 is provided at the outlet 3. The double gate valve discharge device 9 adopts the double gate sealing mechanism in Chinese Utility Model Patent 202022821704.9. Only when one valve is completely closed can the other valve complete one opening and closing action. The two valves operate alternately, which can ensure a good sealing effect.

[0047] The feeding device 7 is located above the inclined bottom plate 6. It feeds the crystals precipitated from the concentrate in the tank 4 from the bottom to the top and then into the collection bin 5. The crystals in the collection bin 5 are output from the outlet 3.

[0048] The tank 4 is equipped with a liquid level maintaining mechanism (liquid level gauge 10 in this embodiment), which sets the liquid level so that the bottom part of the inclined bottom plate 6 is submerged in the concentrate, and the rear part is exposed above the liquid surface.

[0049] The material feeding device 7 includes: a sweeping mechanism 12 and a drive mechanism connected thereto;

[0050] The sweeping mechanism 12 is positioned above the inclined bottom plate 6 and is parallel to it;

[0051] The drive mechanism is mounted on two opposite side walls of the housing 1, located above the sweeping mechanism 12;

[0052] The drive mechanism drives the sweeping mechanism 12 to perform reciprocating synchronous circular motion, so that the sweeping mechanism 12 periodically approaches the inclined bottom plate 6, touches the crystals on the inclined bottom plate 6, and sweeps the crystals to the top of the inclined bottom plate 6, after which the crystals fall into the collection bin 5.

[0053] The sweeping mechanism 12 includes: a plurality of parallel longitudinally arranged angle steels 121 (here, longitudinal refers to the direction of travel from the bottom end to the top end of the inclined base plate 6), and a plurality of parallel transversely arranged sweeping plates 122 (perpendicular to the aforementioned longitudinal directions) interlocked with the bottom of the angle steels 121. The distance between any two adjacent sweeping plates 122 is equal to or less than the circumference diameter of the reciprocating synchronous circular motion.

[0054] The drive mechanism includes: a transmission mechanism 13, a guide plate 14, and a set of drive shafts 15; the set of drive shafts 15 passes through the guide plate 14 via a set of eccentric bearings 16 sleeved thereon; a sweeping mechanism 12 is fixedly connected to the guide plate 14; the set of drive shafts 15 is mounted on the two side walls of the housing 1 and connected to a power source located outside the housing 1 via the transmission mechanism 13; the set of drive 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 bottom plate 6. The power source is a drive motor 17, which is connected to the drive shafts 15 via a magnetic coupler assembly 18.

[0055] The housing 1 is also equipped with a temperature control device for heating the concentrated liquid in the tank 4 to induce crystallization. In this embodiment, the temperature control device uses a plate thermostat 111 and a scale removal unit 112 from a plate-type temperature control device proposed in Chinese Invention Patent Application No. 202411756085.6. The scale removal unit 112 continuously reciprocates within the gaps of the plate thermostat 111 to prevent scale buildup on the sidewalls and subsequent blockage. The scale removal unit 112 and the sweeping mechanism 12 share a common drive mechanism. The scale removal unit 112 is fixedly connected to a set of fixed rods 113, and the fixed rods 113 are fixedly connected to a guide plate 14. The scale removal unit 112 and the sweeping mechanism 12 synchronously perform reciprocating circular motion.

[0056] The temperature regulating medium can be the heating refrigerant flowing from the heat pump compressor (such as...) Figure 3 (As shown), it can also be hot water or steam (such as...) Figure 4 As shown in the figure, even sewage, sludge or waste liquid with high on-site temperature can cause the temperature of the concentrate in tank 4 to rise and evaporate to precipitate crystals.

[0057] In this embodiment, the housing 1 is a sealed housing connected to a vacuum generator 19, which creates a negative pressure inside the housing 1, causing the concentrated liquid to boil and vaporize at a low boiling point. The front or rear end of the vacuum generator 19 is connected to a condenser 20 (the refrigerant flowing from the heat pump expansion valve is delivered to the condenser 20). When the vacuum generator 19 achieves negative pressure, a thermometer 21 and a pressure gauge 22 are installed on the housing 1.

[0058] The working process of the evaporation crystallization chamber:

[0059] Under the control of the level gauge 10, the high-concentration concentrate that is easy to crystallize after evaporation is pumped from the feed inlet 2 into the tank 4 with the inclined bottom plate 6.

[0060] The heating medium flows in the pipes of the plate thermostat 111 and continuously releases heat to continuously heat the liquid in the tank 4.

[0061] The vacuum generator 19 creates a negative pressure in the chamber 1, causing the liquid inside the chamber 1 to boil and vaporize at a lower temperature; the water vapor condenses into water and is discharged after cooling.

[0062] During the vaporization process, crystals continuously precipitate and settle to the bottom of the tank 4. Then, the material feeding device 7 sweeps the crystals from the lower part of the inclined bottom plate 6 to the upper part and pushes them out of the liquid surface. The stirring of the material feeding device 7 promotes heat transfer and uniform heating in the concentrate, accelerates the movement of solute and solvent molecules, prevents the local concentration of the concentrate from being too high, and reduces the adhesion, scaling and deposition of solute on the plate thermostat 111 and the material feeding device 7.

[0063] The residual liquid on the crystals that are pushed out of the liquid surface flows back into the tank 4 along the inclined bottom plate 6; while the crystals that are pushed upwards will have their residual liquid further evaporated under the heating of the inclined bottom plate 6.

[0064] The feeding device 7 makes the concentrated liquid relatively uniform and the heat relatively uniform by stirring, and can continuously crush the crystals in time to prevent the formation of large clumps. It then conveys the crystals up the inclined bottom plate 6 and drops them into the collection bin 5.

[0065] The crystals collected in the collection bin 5 are conveyed to the discharge port 3 by the screw conveyor 8, and discharged outwards by the sealed double gate valve discharge device 9, ensuring that the box is in a sealed state.

[0066] Evaporation crystallization chambers are generally suitable for the following types of materials:

[0067] 1. Substances whose solubility does not change significantly with temperature: such as sodium chloride, where the solute can crystallize out in large quantities by evaporating the solvent. 2. Substances with high solubility and high stability at high temperatures: These substances can maintain good chemical stability during evaporation. 3. Materials from which solid products need to be recovered from solution: such as some chemical products and inorganic salts. 4. Separating a specific solute from a mixed solution containing multiple solutes: utilizing the differences in solubility of different solutes for evaporation and crystallization separation.

[0068] Second embodiment, cooling crystallization box:

[0069] like Figure 5 As shown, the difference between this embodiment and the first embodiment is that the temperature regulating medium flowing in the plate thermostat 111 is a refrigerant or a refrigerant flowing out from the heat pump expansion valve, which lowers the temperature of the concentrated liquid in the box 1 and cools it to precipitate crystals.

[0070] The working process of the cooling crystallization box:

[0071] Under the control of the level gauge 10, the concentrate is pumped from the inlet 2 into the tank 4 with the inclined bottom plate 6;

[0072] The refrigerant flows in the pipes of the plate thermostat 111 to continuously cool the liquid in the tank 4.

[0073] The crystals continue to precipitate and settle to the bottom of the tank 4, and then the material feeding device 7 sweeps the crystals from the low point of the inclined bottom plate 6 to the high point and pushes them out of the liquid surface.

[0074] The residual liquid on the crystals that are removed from the liquid surface flows back into the tank 4 along the inclined bottom plate 6;

[0075] The feeding device 7 stirs the concentrated liquid to make it relatively uniform in temperature and continuously crushes the crystals in time to prevent the formation of large clumps. The material is then conveyed up the inclined bottom plate 6 and dropped into the collection bin 5.

[0076] The crystals collected in the collection bin 5 are conveyed to the discharge port 3 by the screw conveyor 8, and discharged outwards by the double gate valve discharge device 9, ensuring that the box is in a sealed state.

[0077] Cooling crystallization boxes are suitable for the following materials:

[0078] 1. Saturated solutions after heating and evaporation; 2. Substances whose solubility varies greatly with temperature: such as potassium nitrate, which has high solubility at high temperatures and significantly reduced solubility at low temperatures, making it suitable for crystallization through 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 relatively low temperatures; 4. Extraction of temperature-sensitive substances from solutions: these substances can be well separated by cooling crystallization within a specific temperature range; 5. Some materials that require high-purity crystalline products: the cooling crystallization process allows for better control of crystal growth, resulting in purer and more regular crystals.

[0079] Third embodiment: Evaporation and concentration tank + cooling and crystallization box:

[0080] like Figure 6 As shown, the difference between this embodiment and the second embodiment is that an evaporation and concentration tank 23 is connected to the front end of the cooling crystallization tank. After the material is evaporated and concentrated, the liquid part is sent to the cooling crystallization tank for cooling and crystallization. After cooling and crystallization, the liquid is sent to the inlet of the evaporation and concentration tank 23 through the drain port at the bottom of the tank 4 of the cooling crystallization tank for circulation treatment.

[0081] In this embodiment, the evaporation and concentration tank and the cooling crystallization box share a heat pump system. The heating refrigerant flowing from the compressor of the heat pump system flows into the pipes of the tubular heat exchanger of the evaporation and concentration tank, and the cooling refrigerant flowing from the expansion valve of the heat pump system flows into the pipes of the tubular heat exchanger of the cooling crystallization box and is connected to the condensation device of the vacuum generator.

[0082] Fourth embodiment: Evaporation crystallization box + cooling crystallization box:

[0083] like Figure 7 As shown, the difference between this embodiment and the third embodiment is that the evaporation and concentration tank 23 is replaced by the evaporation and crystallization tank 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 and crystallization tank for cooling and crystallization. After cooling and crystallization, the liquid is sent to the feed port of the evaporation and crystallization tank through the drain port at the bottom of the tank 4 of the cooling and crystallization tank for circulation treatment.

[0084] The concentrate crystallization equipment of the present invention can operate sustainably and continuously, with a high degree of automation and no risk of blockage.

[0085] The above embodiments and figures are not intended to limit the form and style of the present invention. Any appropriate changes or modifications made by those skilled in the art should be considered as not departing from the patent scope of the present invention.

Claims

1. A continuously operating concentrated liquid crystallization device, characterized in that: include: A housing having an inlet and an outlet; The bottom of the box is an inclined bottom plate; A feeding device is provided above the inclined bottom plate; The feeding device is located above the inclined bottom plate and feeds the crystals precipitated from the concentrate in the box from the bottom to the top and then discharged from the outlet. The feeding device includes: a sweeping mechanism and a driving mechanism connected thereto; The sweeping mechanism is positioned above the inclined bottom plate and is parallel to it; The drive mechanism is mounted on two opposite side walls of the housing, 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 bottom plate, touches the crystals on the inclined bottom plate, and sweeps the crystals to the top of the inclined bottom plate before discharging them. The sweeping mechanism includes: a plurality of longitudinally arranged angle steels arranged in parallel, and a plurality of transversely arranged sweeping plates inserted into the bottom of the angle steels. The tank is equipped with a liquid level maintaining mechanism, which sets the liquid level so that the bottom part of the inclined bottom plate is submerged in the concentrated liquid, while the rear part is exposed above the liquid surface. A temperature control device is also provided inside or outside the box to heat or cool the concentrated liquid inside the box to cause it to crystallize.

2. The continuously operating concentrated liquid crystallization device as described in claim 1, characterized in that: The drive mechanism includes: a transmission mechanism, a guide plate, and a set of drive shafts; the set of drive shafts passes through the guide plate via a set of eccentric devices sleeved on it; the sweeping mechanism is fixedly connected to the guide plate; the set of drive shafts is mounted on the two side walls of the housing and connected to a power source located outside the housing via the transmission mechanism; the set of drive shafts rotates at the same speed and in the same direction under the drive of the power source, driving the guide plate and the sweeping mechanism to perform reciprocating synchronous circular motion, so that the sweeping mechanism periodically approaches the inclined bottom plate.

3. The continuously operating concentrated liquid crystallization device as described in claim 2, characterized in that: The temperature control device is a plate temperature controller, which is installed in the tank and immersed below the liquid surface; The plate thermostat includes: multiple plate fluid channel assemblies that are interconnected and arranged in parallel at intervals, with a descaling unit that performs reciprocating motion in the gaps between them. The descaling unit continuously performs reciprocating motion in the gaps to prevent scale buildup on the sidewalls of the fluid channel assemblies and prevent blockage. The cleaning unit is fixedly connected to a set of fixed rods, and the fixed rods are fixedly connected to the guide plate.

4. The continuously operating concentrated liquid crystallization device as described in claim 1, characterized in that: The temperature regulating medium flowing inside the temperature regulating device is a heating fluid or a heating refrigerant flowing from a heat pump compressor, which raises the temperature of the concentrated liquid inside the box and causes it to evaporate and precipitate crystals; the concentrated liquid crystallization equipment is an evaporation crystallization box.

5. The continuously operating concentrated liquid crystallization device as described in claim 4, characterized in that: The chamber is a sealed chamber connected to a vacuum generator, which creates a negative pressure inside the chamber, causing the concentrate to boil and vaporize at a low boiling point.

6. The continuously operating concentrated liquid crystallization device as described in claim 1, characterized in that: The temperature regulating medium flowing inside the temperature regulating device is a refrigerant or a refrigerant flowing out from the heat pump expansion valve, which lowers the temperature of the concentrated liquid inside the box and cools it to precipitate crystals; the concentrated liquid crystallization equipment is a cooling crystallization box.

7. The continuously operating concentrated liquid crystallization device as described in claim 6, characterized in that: The front inlet of the cooling crystallization box is also connected to the outlet of an evaporation and concentration tank, and the bottom of the cooling crystallization box is provided with a drain outlet connected to the inlet of the evaporation and concentration tank.

8. The continuously operating concentrated liquid crystallization device as described in claim 6, characterized in that: The front inlet of the cooling crystallization box is also connected to the outlet of an evaporation crystallization box, and the bottom of the cooling crystallization box is provided with a drain outlet connected to the inlet of the evaporation crystallization box.

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