Evaporative crystallization stirring system

Abstract

The application relates to the technical field of sewage treatment, and mainly relates to an evaporation crystallization stirring system. The system comprises an evaporation tank, the evaporation tank is in a cylindrical structure and is used for bearing treatment liquid, a liquid inlet, a discharge outlet and a steam discharge outlet are arranged on the tank body of the evaporation tank; a heat exchange mechanism is arranged outside the evaporation tank and is used for heat exchange treatment of the treatment liquid; a stirring shaft and a driving mechanism, the stirring shaft is arranged in the evaporation tank and is located at the shaft center of the evaporation tank, and the output end of the driving mechanism is in transmission connection with the stirring shaft; a first spiral blade, a second spiral blade and a supporting shaft for connecting the first spiral blade are arranged on the stirring shaft and extend spirally along the shaft center of the evaporation tank, the first spiral blade is annularly arranged outside the stirring shaft, the second spiral blade is arranged on the stirring shaft, the first spiral blade is not in contact with the second spiral blade and the spiral directions of the first spiral blade and the second spiral blade are opposite. The system is not prone to scaling, is convenient for concentration and crystallization, can avoid damage caused by crystallization extrusion, and effectively meets the long-term use requirement of sewage treatment.

Description

Technical Field

[0001] This application relates to the field of wastewater treatment technology, and mainly to an evaporation crystallization stirring system. Background Technology

[0002] Traditional evaporators, commonly used in industrial wastewater treatment, have long played a vital role in controlling pollution and reducing wastewater discharge. Existing evaporators work by heating wastewater to evaporate the water, which is then continuously released as hot steam. As this process continues, the concentration of liquid remaining in the evaporator gradually increases. When the concentration reaches a preset value, the concentrated liquid must be completely drained. This treated liquid contains numerous complex pollutants and harmful substances, making direct resource utilization or safe discharge impossible. Therefore, it is concentrated by reducing its water content for further outsourcing for processing.

[0003] During the continuous evaporation and concentration of the treated liquid, a certain amount of scale and precipitated solutes inevitably accumulate on the surface of the heat exchange components inside the evaporator. The formation of these deposits hinders heat transfer, significantly affecting the thermal conductivity of the heat exchange components and reducing heat exchange efficiency. This reduced heat exchange efficiency not only prolongs the evaporation process and increases energy consumption but also further weakens the effect of low-temperature evaporation and separation, resulting in a significant decrease in the overall operating efficiency and performance of the evaporator. Furthermore, due to the accumulation of scale and solutes, the internal structure of the heat exchange components is complex, making cleaning extremely difficult. Regular maintenance and cleaning typically require substantial manpower, resources, and time, which to some extent limits the long-term use and processing efficiency of traditional evaporators.

[0004] It is evident that traditional evaporators suffer from problems in industrial wastewater treatment, such as complex concentrate processing, easy scaling of heat exchange components leading to cleaning difficulties, and reduced heat exchange efficiency, making them unsuitable for the requirements of modern industrial wastewater treatment. Therefore, existing technologies require further improvement and development. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the purpose of this application is to provide an evaporation crystallization stirring system, which aims to solve the problems of uneven heating of the processing liquid, easy local accumulation of crystals and poor scraping effect in existing traditional evaporators, which easily leads to low heat exchange efficiency and easy damage to the blades due to crystal compression.

[0006] The technical solution of this application is as follows:

[0007] This application provides an evaporation crystallization stirring system, comprising:

[0008] An evaporator, which is a cylindrical structure, is used to hold the processing liquid. The evaporator has an inlet, a outlet and a steam outlet on its body.

[0009] A heat exchange mechanism is installed outside the evaporator for heat exchange treatment of the liquid.

[0010] A stirring shaft and a drive mechanism are provided. The stirring shaft is disposed inside the evaporator and located at the axis of the evaporator. The output end of the drive mechanism is connected to the stirring shaft for transmission.

[0011] The stirring shaft is provided with a first spiral blade, a second spiral blade, and a support shaft for connecting the first spiral blade, which extend spirally along the axis of the evaporator. The first spiral blade is sleeved around the stirring shaft, and the second spiral blade is disposed on the stirring shaft. The first spiral blade does not contact the second spiral blade and the spiral directions are opposite.

[0012] Furthermore, the first spiral blade is disposed close to the inner wall of the evaporator, and a small gap is formed between the outer edge of the first spiral blade and the inner wall of the evaporator without contact.

[0013] Furthermore, the support shafts are arranged in groups, with multiple support shafts arranged in a group along the extension direction of the stirring shaft;

[0014] The stirring shaft also includes:

[0015] A reinforcing strip, which is fixedly connected to a set of support shafts.

[0016] Furthermore, the evaporator is configured to be horizontal, and the heat exchange mechanism is located at the bottom of the evaporator;

[0017] The heat exchange mechanism includes:

[0018] A semi-circular bottom plate is located below the evaporator, is connected to the evaporator, and covers the semi-circular outer wall of the evaporator;

[0019] Multiple heat medium baffles are staggered along the extension direction of the evaporator, and the multiple heat medium baffles are disposed between the semi-circular outer wall and the semi-circular bottom plate of the evaporator to form a "Z"-shaped heat medium channel.

[0020] Furthermore, the evaporation crystallization stirring system also includes:

[0021] An air blowing mechanism is provided outside the evaporator and is used to blow air into the evaporator.

[0022] Furthermore, the evaporation crystallization stirring system also includes:

[0023] An air intake pipe is provided to connect the evaporator and the air blowing mechanism. The air outlet of the air intake pipe is located inside the cylinder of the evaporator and faces the first spiral blade.

[0024] An air amplifier is mounted on the air intake duct.

[0025] Furthermore, the evaporation crystallization stirring system also includes:

[0026] A discharge port cylinder is used to control the opening and closing state of the discharge port;

[0027] The discharge port is located at one end of the evaporator and at the bottom of the evaporator.

[0028] Furthermore, the drive mechanism includes a motor and a timing belt, and the motor drives the stirring shaft to rotate via the timing belt.

[0029] Beneficial effects: In this application, the heat exchange mechanism can perform heat exchange treatment on the liquid in the evaporator, which is convenient for concentration and crystallization; the reverse double helical blades form an axial convection circulation of the liquid in the tank, which greatly improves the uniformity of stirring, allows the liquid to be fully heated, avoids local concentrated crystallization, and improves the evaporation and concentration efficiency; the outer first helical blade can be close to the inner wall of the evaporator, and can scrape off the crystals or scale precipitated on the tank wall in real time when rotating, ensuring the heat conduction performance of the heat exchange mechanism to the tank body and reducing energy consumption; the double blades do not contact each other and the flow space is reserved through the support shaft, which, together with the backflow guiding effect of the reverse helix, prevents crystals from accumulating in large quantities at one end of the tank, prevents the stirring parts from being damaged by crystal extrusion, and reduces the risk of parts jamming. Attached Figure Description

[0030] Figure 1 This is one of the structural schematic diagrams of the evaporation crystallization stirring system of this application.

[0031] Figure 2 This is the second schematic diagram of the evaporation crystallization stirring system of this application.

[0032] Figure 3 This is the third schematic diagram of the evaporation crystallization stirring system of this application.

[0033] Labeling Explanation: 100, Evaporator; 110, Liquid Inlet; 120, Discharge Outlet; 121, Discharge Outlet Cylinder; 130, Steam Outlet; 200, Heat Exchange Mechanism; 210, Semi-circular Bottom Plate; 220, Heat Medium Baffle Plate; 300, Stirring Shaft; 310, First Helical Blade; 311, Support Shaft; 312, Reinforcing Strip; 320, Second Helical Blade; 410, Air Inlet Pipe; 420, Air Amplifier. Detailed Implementation

[0034] This application provides an evaporation and crystallization stirring system. To make the objectives, technical solutions, and effects of this application clearer and more explicit, the following provides a more detailed description. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0035] Reference Figures 1-3 This application provides an evaporation crystallization stirring system, comprising:

[0036] Evaporator 100 is a cylindrical structure used to hold the processing liquid. The tank body of evaporator 100 is provided with liquid inlet 110, discharge outlet 120 and steam outlet 130.

[0037] The heat exchange mechanism 200 is installed outside the evaporator 100 and is used for heat exchange treatment of the treatment liquid.

[0038] The stirring shaft 300 and the drive mechanism are provided. The stirring shaft 300 is located inside the evaporator 100 and at the center of the evaporator 100. The output end of the drive mechanism is connected to the stirring shaft 300 for transmission.

[0039] This application utilizes a cylindrical structure to form an evaporator 100. During wastewater treatment, the treatment liquid is injected into the evaporator 100 through the inlet 110. The heat exchange mechanism 200 heats the treatment liquid within the evaporator 100. A drive mechanism rotates the stirring shaft 300, increasing the flow rate of the treatment liquid within the evaporator 100. This ensures the treatment liquid is heated evenly and efficiently, guaranteeing high heat exchange efficiency. The process involves heating and evaporating the water from the treatment liquid to concentrate it for subsequent processing. The steam generated during evaporation is discharged through the steam outlet 130. After treatment, the concentrated treatment liquid, precipitated crystals, or a mixture of both are discharged through the discharge outlet 120. The evaporation, crystallization, and stirring system provided in this application offers a simple and easy-to-clean treatment process. The heat exchange components are located outside the evaporator 100, reducing the risk of scaling and effectively meeting the long-term needs of wastewater treatment.

[0040] The evaporator 100 can be made of stainless steel, and the side plates at both ends of the evaporator 100 can be stainless steel flanges to seal both ends of the evaporator 100. Observation windows can be installed on the side plates to facilitate observation of the concentration of the processed liquid and to promptly address any issues that may arise.

[0041] In addition to facilitating the discharge of steam for concentration, the steam outlet 130 can be connected to a vacuum system. The vacuum system can be used to evacuate the evaporator 100, ensuring that the evaporator 100 is kept under negative pressure. This allows a large amount of water in the liquid to evaporate at around 40°C, which helps to reduce energy consumption and improve concentration efficiency.

[0042] Reference Figure 1 and Figure 3 In one specific embodiment of this application, the stirring shaft 300 is provided with a first spiral blade 310, a second spiral blade 320 extending spirally along the axis of the evaporator 100, and a support shaft 311 for connecting the first spiral blade 310. The first spiral blade 310 is sleeved around the stirring shaft 300, and the second spiral blade 320 is disposed on the stirring shaft 300. The first spiral blade 310 does not contact the second spiral blade 320, and their spiral directions are opposite. In this application, by providing the first spiral blade 310 and the second spiral blade 320 on the stirring shaft 300, the stirring efficiency of the processed liquid can be improved, allowing the processed liquid to be fully heated under the stirring effect. This helps to reduce the occurrence of concentrated crystallization due to localized heating within the evaporator 100, thus ensuring the overall concentration efficiency of the processed liquid.

[0043] In this application, by surrounding the stirring shaft 300 with the first helical blade 310 and ensuring that the inner side of the first helical blade 310 does not contact the second helical blade 320, a space for liquid and crystallization to pass through can be formed between the first helical blade 310 and the second helical blade 320.

[0044] Among them, a reinforcing rib can be provided at the connection between the support shaft 311 and the stirring shaft 300, which helps to ensure the rotational stability of the first helical blade 310.

[0045] By connecting the stirring shaft 300 to the first spiral blade 310 through the support shaft 311, space can be left for liquid or crystals to pass through and the first spiral blade 310 can continue to rotate with the stirring shaft 300.

[0046] In this application, by providing a second spiral blade 320 on the stirring shaft 300 with a spiral direction opposite to that of the first spiral blade 310, the degree of stirring and dispersion of the treated liquid can be further improved, and the flow of the treated liquid in the evaporator 100 can be guided and a circulation effect can be formed according to the spiral direction. Furthermore, when crystallization begins, the second spiral blade 320 forms a flow opposite to that of the first spiral blade 310. While the first spiral blade 310 continuously presses out the processing liquid, the second spiral blade 320 continuously guides the processing liquid to flow through the reverse spiral effect. This helps to guide the crystals generated in the evaporator 100 back to the evaporator, preventing the crystals from accumulating to a high degree at one end of the evaporator 100 during the continuous stirring and crystallization process. At the same time, when the generated crystals enter the space between the first spiral blade 310 and the second spiral blade 320, the crystals can be guided back to the evaporator by the second spiral blade 320 to a longer distance before gradually falling back into the space of the first spiral blade 310 due to their own weight. In this way, the crystals will not be repeatedly collected and back to the evaporator within a short distance, which greatly increases the collectable capacity of crystals during the concentration process and further avoids the problem of accumulation that could damage the blades.

[0047] Specifically, the effective radius of the first helical blade 310 can be set to be larger than that of the second helical blade 320 to ensure the overall mixing and discharge effect of the treatment liquid.

[0048] Reference Figure 1 and Figure 3 In one specific embodiment of this application, the first spiral blade 310 is disposed close to the inner wall of the evaporator 100, and a small gap is formed between the outer edge of the first spiral blade 310 and the inner wall of the evaporator 100 without contact.

[0049] In this application, by providing a first spiral blade 310 close to the inner wall of the evaporator 100, the first spiral blade 310 can scrape away crystals that may precipitate on the inner wall of the evaporator 100 while spiraling, avoiding the formation of thick crystals or scale, ensuring the thermal conductivity of the heat exchange mechanism 200 to the evaporator 100, which is beneficial to ensuring heat exchange effect and reducing energy consumption. The distance between the first spiral blade 310 and the inner wall of the evaporator 100 can be controlled to a small size, ensuring that there is no jamming and that the scraping effect on the inner wall is guaranteed; this distance can be specifically set to about 3 mm.

[0050] Specifically, since the processing liquid of this application is processed in a relatively closed evaporator 100, rather than a continuous discharge process, and the first spiral blade 310 not only plays a stirring role but also needs to scrape the inner wall of the evaporator 100, based on the need to scrape the inner wall, after setting the first spiral blade 310 and the inner wall of the evaporator 100 to a small gap size, if the first spiral blade 310 extends continuously from the stirring shaft 300, the processing liquid will be continuously discharged to one end of the evaporator 100 during the continuous stirring process. At this time, only the small gap between the first spiral blade 310 and the inner wall of the evaporator 100 can flow back, and the pressure generated can easily cause damage.

[0051] In addition to stirring and scraping the inner wall, the continuously rotating first spiral blade 310 will gradually concentrate the precipitated crystals at one end of the evaporator 100. Since the gap between the first spiral blade 310 and the inner wall of the evaporator 100 is small, and the first spiral blade 310 continues to press against the evaporator 100 during rotation, if a large amount of crystals accumulates at this point or is not discharged from the gap in time, the accumulation of a large amount of crystals at this point may also damage the first spiral blade 310.

[0052] In response to the above situation, the reverse-oriented second spiral blade 320 of this application allows the processing liquid continuously pressed against one end of the evaporator 100 to flow back smoothly from the outflow space, avoiding the formation of excessive stirring pressure and carrying away some crystals. Furthermore, after crystallization begins, the first spiral blade 310, due to its spiral arrangement, has an angled inclination. Viewed from the cross-section of the pushing process, the contact area between the first spiral blade 310 and the crystals at each cross-section is a line rather than a surface, giving the crystals a high degree of freedom. Moreover, a relatively large passage space is left between the first spiral blade 310 and the stirring shaft 300, allowing the accumulated crystals to easily flow out through the space between the first spiral blade 310 and the stirring shaft 300 from the inclined blade surface. This facilitates backflow through the reserved space during discharge and makes it easier to flow back with the processing liquid during concentration. Through the design of this application, a large accumulation of crystals at one end of the evaporator 100 can be avoided, effectively preventing damage caused by compression during the concentration process of the processing liquid or the discharge of crystals.

[0053] Reference Figure 1 and Figure 3 In one specific embodiment of this application, the support shafts 311 are arranged in groups, and multiple support shafts 311 are arranged along the extension direction of the stirring shaft 300.

[0054] The stirring shaft 300 also includes:

[0055] The reinforcing strip 312 is fixedly connected to a set of support shafts 311.

[0056] One or more support shafts 311 can be provided, or multiple support shafts can be provided according to the number of spiral turns of the first spiral blade 310. The direction can be set along the extension direction of the stirring shaft 300. It is more preferred that two sets of support shafts 311 are symmetrically arranged with the stirring shaft 300. One support shaft 311 is provided for every half turn of the first spiral blade 310, which is beneficial for fixing without adversely affecting the required flow guiding effect. The material of the reinforcing strip 312 can be stainless steel.

[0057] In this application, a support shaft 311 is provided to connect the stirring shaft 300 and the first spiral blade 310. While fixing the first spiral blade 310, it does not obstruct the space left. After reinforcement, it is beneficial to use the first spiral blade 310 to scrape away any crystals or scale that may appear on the inner wall of the evaporator 100, thereby maintaining the cleanliness and thermal conductivity of the inner wall of the evaporator 100.

[0058] The support shaft 311 can be evenly arranged in 2-3 sets around the stirring shaft 300, which can further ensure that the first spiral blade 310 is subjected to uniform force without affecting the required reflux effect. At the same time, it avoids damage or deformation of the first spiral blade 310 due to uneven force, and ensures the stirring and cleaning effect of the first spiral blade 310.

[0059] Reference Figure 2 and Figure 3 In one specific embodiment of this application, the evaporator 100 is configured as a horizontal type, and the heat exchange mechanism 200 is disposed at the bottom of the evaporator 100;

[0060] The heat exchange mechanism 200 includes:

[0061] A semi-circular bottom plate 210 is located below the evaporator 100, covers the semi-circular outer wall of the evaporator 100, and is connected to and covers the semi-circular outer wall of the evaporator 100.

[0062] Multiple heat medium baffles 220 are staggered along the extension direction of the evaporator 100. The multiple heat medium baffles 220 are arranged between the semi-circular outer wall and the semi-circular bottom plate 210 of the evaporator 100 and form a "Z"-shaped heat medium channel.

[0063] The heat exchange mechanism 200 can perform heat exchange treatment on the treatment liquid, specifically by heating the treatment liquid in the evaporator 100 to evaporate and concentrate it. The semi-circular bottom plate 210 and the heat medium baffle 220 can be made of stainless steel.

[0064] In this application, the semi-circular outer wall of the bottom of the evaporator 100 is sealed by a semi-circular bottom plate 210, and a "Z"-shaped heat medium channel is formed by multiple heat medium baffles 220 arranged in an alternating manner. After setting the corresponding heat medium inlet and outlet, the evaporator 100 can be heated by circulating heat medium, which has high heat exchange efficiency. With the first spiral blade 310 rotating with the stirring shaft 300, it can be ensured that the entire processing liquid in the evaporator 100 is fully heated to achieve concentration.

[0065] In one specific embodiment of this application, the evaporation crystallization stirring system further includes:

[0066] An air blowing mechanism (not shown in the figure) is located outside the evaporator 100 and is used to blow air into the evaporator 100.

[0067] In this application, in addition to crystallization on the inner wall of the evaporator 100, the treatment liquid may also crystallize on the first spiral blade 310 and the stirring shaft 300 during concentration. During the discharge process, air can be blown into the evaporator 100 through the set air blowing mechanism, which can blow off the crystals attached to the stirring shaft 300 and the first spiral blade 310. After multiple concentrations, it is not easy for a covering crystal surface or scale to form on the first spiral blade 310, thus ensuring the concentration and crystallization effect.

[0068] Reference Figure 1 and Figure 3 In one specific embodiment of this application, the evaporation crystallization stirring system further includes:

[0069] The air inlet pipe 410 is used to connect the evaporator 100 and the air blowing mechanism. The air outlet of the air inlet pipe 410 is located inside the cylinder of the evaporator 100 and faces the first spiral blade 310.

[0070] Air amplifier 420 is installed on air intake duct 410.

[0071] In this application, the first spiral blade 310 is arranged to extend spirally along the axis of the cylindrical evaporator 100 and is relatively perpendicular to the cylindrical body of the evaporator 100. It is set in the tank body through the air inlet and faces the nearest first spiral blade 310. The airflow blown out has a better shearing effect on the crystals attached thereto, which is conducive to blowing off the crystals on the first spiral blade 310 and collecting and discharging them, reducing the number of thorough cleanings.

[0072] Reference Figures 1-3 In some embodiments of this application, the evaporation crystallization stirring system further includes:

[0073] Discharge port cylinder 121 is used to control the opening and closing state of discharge port 120;

[0074] The discharge port 120 is located at one end of the evaporator 100 and at the bottom of the evaporator 100.

[0075] In this application, when concentration is stopped and the material is discharged through the first spiral blade 310, the discharge port 120 is located at the bottom of the evaporator 100, and the concentrated processing liquid and crystals are easily discharged by gravity. Since the overall liquid load of the evaporator 100 is large after the processing liquid is injected, the discharge port 120 is closed by setting a discharge port cylinder 121 to effectively cope with the pressure of the processing liquid, so as to control the opening and closing state of the discharge port 120.

[0076] Specifically, the direction of material discharge of the first spiral blade 310 can be controlled by controlling the rotation direction of the stirring shaft 300, ensuring that it corresponds to the setting position of the discharge port 120.

[0077] Reference Figure 3 In some embodiments of this application, the drive mechanism includes a motor and a timing belt, and the motor drives the stirring shaft 300 to rotate via the timing belt.

[0078] In this application, the stirring shaft 300 can be driven to rotate by the motor by setting the drive gear of the motor and the roller gear of the stirring shaft 300 to mesh with the synchronous belt, so as to facilitate the stirring operation.

[0079] In a specific embodiment of the evaporation crystallization stirring system of this application, the discharge port 120 is closed by the discharge port cylinder 121, and the processing liquid is injected into the evaporation tank 100 through the liquid inlet 110. The motor in the drive mechanism is turned on, and the stirring shaft 300 is driven to rotate synchronously through the synchronous belt. The first spiral blade 310, which is fixed on the stirring shaft 300, rotates and stirs the processing liquid.

[0080] The hot medium is circulated through the "Z"-shaped hot medium channel formed by the hot medium baffle 220. The semi-circular bottom plate 210 ensures that the overall flowing hot medium fits the shape of the evaporator 100. Under the rotation of the first spiral blade 310, the processing liquid in the evaporator 100 is fully and evenly heated, the water is evaporated and concentrated, and the steam generated by evaporation is discharged through the steam outlet 130.

[0081] During the concentration process, the first spiral blade 310 is close to the inner wall of the evaporator 100. The first spiral blade 310 is fixed by the support shaft 311 and the reinforcing strip 312. During the rotation, the rotating first spiral blade 310 continuously scrapes off the crystals precipitated from the inner wall of the evaporator 100, which helps to ensure the thermal conductivity and concentration efficiency of the evaporator 100.

[0082] During the continuous rotation of the first spiral blade 310, the scraped crystals are continuously collected by the first spiral blade 310 to one end of the evaporator 100. The first spiral blade 310 is inclined at an angle due to its spiral arrangement. From the cross-section of the material pushing forward, the contact part between the first spiral blade 310 and the crystals at each cross-section position is a line rather than a surface. The collected crystals have a great degree of freedom. By setting the first spiral blade 310 to be wrapped around the outside of the stirring shaft 300, a space is formed between the first spiral blade 310 and the outer wall of the stirring shaft 300 for the crystals to pass through. This allows the processed liquid and the collected crystals to flow back through this space during the stirring and concentration process. Moreover, the second spiral blade 320, which is set in the opposite spiral direction to the first spiral blade 310, can further enhance the reflux effect and the overall circulation effect of the processed liquid, and avoid damage.

[0083] After concentration is completed, adjust the rotation speed of the stirring shaft 300, open the discharge port cylinder 121, open the discharge port 120, and after the concentrated treatment liquid is discharged, the continuously rotating first spiral blade 310 scrapes off the crystals formed on the inner wall of the evaporator 100 and discharges them out of the discharge port 120.

[0084] During the discharge process, the air blowing mechanism can be activated to blow air out of the first spiral blade 310, which can blow off some of the crystals on the first spiral blade 310 and the stirring shaft 300, and at the same time accelerate the discharge process. After the discharge is completed, the concentration treatment of the treatment liquid is completed.

[0085] It should be understood that the application of this application is not limited to the examples above. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of this application.

Claims

1. An evaporation crystallization stirring system, characterized in that, include: Evaporator (100), the evaporator (100) is a cylindrical structure used to carry the processing liquid, and the tank body of the evaporator (100) is provided with a liquid inlet (110), a discharge port (120) and a steam outlet (130). A heat exchange mechanism (200) is provided outside the evaporator (100) for heat exchange treatment of the processing liquid; A stirring shaft (300) and a drive mechanism are provided. The stirring shaft (300) is disposed inside the evaporator (100) and located at the axis of the evaporator (100). The output end of the drive mechanism is connected to the stirring shaft (300) in a transmission manner. The stirring shaft (300) is provided with a first spiral blade (310), a second spiral blade (320) extending spirally along the axis of the evaporator (100), and a support shaft (311) for connecting the first spiral blade (310). The first spiral blade (310) is sleeved around the stirring shaft (300), and the second spiral blade (320) is disposed on the stirring shaft (300). The first spiral blade (310) does not contact the second spiral blade (320) and the spiral directions are opposite. The evaporator (100) is configured to be horizontal, and the heat exchange mechanism (200) is located at the bottom of the evaporator (100); The heat exchange mechanism (200) includes: A semi-circular bottom plate (210) is located below the evaporator (100), is connected to the evaporator (100), and covers the semi-circular outer wall of the evaporator (100); A heat medium baffle (220) is provided. Multiple heat medium baffles (220) are staggered along the extension direction of the evaporator (100). Multiple heat medium baffles (220) are provided between the semi-circular outer wall of the evaporator (100) and the semi-circular bottom plate (210) to form a "Z"-shaped heat medium channel.

2. The evaporation crystallization stirring system according to claim 1, characterized in that, The first spiral blade (310) is disposed close to the inner wall of the evaporator (100), and a small gap is formed between the outer edge of the first spiral blade (310) and the inner wall of the evaporator (100) without contact.

3. The evaporation crystallization stirring system according to claim 2, characterized in that, The support shafts (311) are arranged in groups, and a group of support shafts (311) are arranged in multiple ways along the extension direction of the stirring shaft (300); The stirring shaft (300) also includes: A reinforcing strip (312) is fixedly connected to a set of support shafts (311).

4. The evaporation crystallization stirring system according to claim 1, characterized in that, The evaporation crystallization stirring system also includes: An air blowing mechanism is provided outside the evaporator (100) and is used to blow air into the evaporator (100).

5. The evaporation crystallization stirring system according to claim 4, characterized in that, The evaporation crystallization stirring system also includes: An air inlet pipe (410) is provided to connect the evaporator (100) and the blowing mechanism. The air outlet of the air inlet pipe (410) is located inside the cylinder of the evaporator (100) and faces the first spiral blade (310). An air amplifier (420) is disposed on the air intake duct (410).

6. The evaporation crystallization stirring system according to claim 1, characterized in that, The evaporation crystallization stirring system also includes: Discharge port cylinder (121), the discharge port cylinder (121) is used to control the opening and closing state of the discharge port (120); The discharge port (120) is located at one end of the evaporator (100) and at the bottom of the evaporator (100).

7. The evaporation crystallization stirring system according to claim 1, characterized in that, The drive mechanism includes a motor and a timing belt, and the motor drives the stirring shaft (300) to rotate via the timing belt.

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