Waste liquid evaporative crystallization device and unblocking method
The problem of blockage in the feed pipe of the waste liquid evaporation and crystallization device was solved by gas unblocking method, realizing automated control, improving water resource recycling rate and system stability, and reducing energy consumption and operation difficulty.
Patent Information
- Application Number
- CN202510997094.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-18
- Publication Date
- 2025-11-11
AI Technical Summary
Existing waste liquid evaporation and crystallization devices are prone to clogging of the feed pipe due to salt crystal deposition during operation, which affects the continuous operation of the system. Furthermore, water flushing and unclogging methods waste water resources, increase energy consumption, and may introduce impurities.
The gas unblocking method is adopted, and the controller controls the switching valve and the inflation mechanism to use pressurized gas to clear the blockage in the feed pipe, avoiding water flushing and realizing automated control.
It improved the water reuse rate of the device, reduced energy consumption and equipment maintenance costs, ensured the continuity and stability of the system, and avoided contamination by impurities.
Smart Images
Figure CN120922951A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of waste liquid evaporation and crystallization technology, and in particular to a waste liquid evaporation and crystallization device and a method for unblocking. Background Technology
[0002] In the field of industrial water treatment, waste liquid evaporation and crystallization equipment is a key device for achieving zero wastewater discharge. It is mainly used to evaporate, concentrate, and crystallize industrial wastewater, so that salts in high-salt concentrates can be separated out, ultimately realizing the recycling of water resources and the separation and disposal of solid salts.
[0003] In existing technologies, during the operation of waste liquid evaporation and crystallization devices, the feed pipe is prone to blockage due to salt crystal deposition and adhesion, which seriously affects the continuous operation of the system. When the feed pipe becomes blocked, flushing water is usually injected to clear the blockage. This not only consumes a large amount of water resources and reduces the water reuse rate, but also requires the material containing flushing water to be re-evaporated, further increasing energy consumption. Summary of the Invention
[0004] The purpose of this application is to provide a waste liquid evaporation crystallization device and a plugging method. The gas plugging method eliminates the need for consuming a large amount of flushing water, thereby fundamentally reducing water waste and improving the overall water reuse rate of the device.
[0005] In a first aspect, the present invention provides a waste liquid evaporation and crystallization apparatus, comprising:
[0006] A crystal slurry tank has a cavity for holding materials, and a stirring mechanism is provided inside the cavity. The bottom of the crystal slurry tank has a discharge port that communicates with the cavity.
[0007] The feeding pipe has an inlet end and an outlet end. The inlet end is connected to the discharge port, and the outlet end is connected to external equipment. Along the material conveying direction of the feeding pipe, a first switch valve and a second switch valve are sequentially spaced on the feeding pipe.
[0008] The unblocking pipe has an air outlet and an air inlet. The air outlet is connected to the pipe section between the first switch valve and the second switch valve of the feed pipe. The air inlet is connected to the inflation mechanism. A third switch valve is provided on the unblocking pipe.
[0009] The controller is electrically connected to the stirring mechanism, the first switching valve, the second switching valve, and the third switching valve, respectively.
[0010] When the controller detects a blockage in the discharge pipe, it controls one of the first and second switching valves to close and the other to open, and controls the third switching valve to open, so that the pressurized gas generated by the inflation mechanism enters the discharge pipe through the unblocking pipe to clear the blockage.
[0011] Beneficial effects: In this waste liquid evaporation and crystallization device, the second switch valve on the feed pipe remains open during operation. When a large amount of salt crystals precipitate in the crystal slurry tank, the controller automatically opens the first switch valve, allowing the salt crystals to enter the feed end of the feed pipe through the discharge port. Since the first and second switch valves are open at this time, the salt crystals can smoothly pass through the feed pipe and be transported to external equipment from the discharge end, realizing automated unloading of the device.
[0012] When the controller detects a blockage in the feed pipe, it controls the first and second switching valves to a "one closed, one open" state, while simultaneously opening the third switching valve. This allows pressurized gas generated by the inflation mechanism to enter the feed pipe through the unblocking pipe, clearing the blockage under the impact force of the gas. By incorporating the unblocking pipe and inflation mechanism, and utilizing pressurized gas to directionally purge the blocked pipe, salt crystal blockage can be quickly removed, preventing the unit from shutting down or interrupting operation due to blockage. This significantly improves the continuity and stability of operation and reduces efficiency losses caused by downtime for maintenance.
[0013] In addition, the use of gas-based plugging eliminates the need for large amounts of flushing water, fundamentally reducing water waste and improving the overall water reuse rate of the device. It also avoids the extra energy consumption required for re-evaporation of materials containing moisture due to the injection of flushing water, reducing equipment maintenance costs related to water flushing, achieving energy conservation and consumption reduction, and lowering the economic cost of long-term operation.
[0014] Meanwhile, gas venting can prevent external pollutants that may be introduced by water flushing, effectively preventing impurities from affecting the materials inside the device; and through the linkage between the controller and each switching valve and stirring mechanism, the blockage detection and venting process are automated, eliminating the need for frequent manual intervention and reducing the difficulty of operation and labor intensity.
[0015] In one optional implementation, when the controller detects that the feed pipe is blocked, the controller first controls the first switching valve to close, the second switching valve to open, and the third switching valve to open, and then controls the first switching valve to open and the second switching valve to close.
[0016] Alternatively, when the controller detects a blockage in the feed pipe, the controller first controls the first switching valve to open, the second switching valve to close, and the third switching valve to open, then controls the first switching valve to close and the second switching valve to open.
[0017] Beneficial effects: When blockage occurs in the feed pipe, the blockage may occur in different locations. The controller first closes the first switching valve and opens the second switching valve, allowing gas to purge from the connection point of the unblocking pipe towards the discharge end, clearing the blockage in the downstream section of the feed pipe. Subsequently, the controller switches to opening the first switching valve and closing the second switching valve, purging gas towards the feed end to clear the blockage in the upstream section of the feed pipe. Similarly, the upstream blockage can be cleared first, and then the direction can be switched to clear the downstream blockage. Bidirectional alternating purging can cover the entire feed pipe without dead angles, and is particularly effective in clearing multi-point blockages or long blockages, achieving comprehensive coverage of the blocked area and improving the success rate of unblocking.
[0018] In one optional embodiment, the stirring mechanism is used to send the operating current value of the stirring mechanism to the controller. When the controller determines that the feeding pipe is blocked based on the received operating current value being greater than or equal to a first preset current value A1.
[0019] Beneficial effects: When the feed pipe becomes blocked, the salt crystals in the receiving cavity cannot be discharged smoothly, leading to an increase in salt crystals and stirring resistance. To maintain normal speed, the stirring mechanism needs to increase the motor output power, which is reflected in a significant increase in operating current. The current change is positively correlated with the degree of blockage, and the response speed is extremely fast, allowing the controller to detect the blockage as soon as it occurs, thus buying time for subsequent unblocking actions and preventing further deterioration of the blockage.
[0020] In one optional implementation, when the controller receives an operating current value that is greater than or equal to a second preset current value A2, and A2 < A1, the controller controls the first switching valve and the second switching valve to open.
[0021] Beneficial effects: As the amount of salt crystals in the containment chamber increases, the operating resistance of the stirring mechanism also increases, which is reflected in an increase in the operating current value. When the operating current value reaches A2, the controller determines that the amount of crystals has met the discharge conditions. At this time, the first and second switching valves are opened simultaneously, allowing the salt crystals in the containment chamber to enter the feed end of the discharge pipe through the discharge port and be smoothly discharged along the discharge pipe. This ensures that the salt crystals are discharged in a timely manner with a moderate accumulation and without clumping, avoiding the risk of subsequent blockage caused by excessive accumulation of salt crystals.
[0022] In one optional implementation, after the first switching valve and the second switching valve are opened, when the controller receives the operating current value which is less than or equal to a third preset current value A3, and A3 < A2, the controller controls the first switching valve to close.
[0023] Beneficial effects: When there are many salt crystals, the stirring resistance of the stirring mechanism is high, and the operating current value is high (≥A2). As the discharge proceeds, the amount of salt crystals decreases, the resistance decreases, and the operating current value gradually decreases. When the operating current value drops to A3 (below the threshold of A2), it indicates that the salt crystals in the receiving cavity have been basically discharged. The controller uses this as a signal to close the first switching valve, which can accurately match the discharge progress and avoid the secondary accumulation of residual salt crystals caused by prematurely closing the first switching valve. If the valve is closed before the operating current value reaches A3, a large amount of salt crystals may still remain in the receiving cavity.
[0024] In one optional embodiment, the waste liquid evaporation crystallization device further includes a weighing pan, which is disposed at the bottom of the receiving cavity and is electrically connected to the controller.
[0025] The weighing pan is used to send the weight value of the material in the receiving cavity to the controller. When the controller determines that the material discharge pipe is blocked based on the received weight value being greater than or equal to a first preset weight value B1.
[0026] Beneficial effects: The weighing pan directly measures the total weight of the material in the containment chamber. When the feed pipe is blocked, the salt crystals in the containment chamber cannot be discharged normally and will continue to accumulate, causing the weight value to rise continuously. When the weight value reaches B1, the controller can clearly determine that the feed pipe is blocked. Compared with monitoring the weight signal only by the operating current value of the stirring mechanism, this method more directly corresponds to the actual accumulation of salt crystals and reduces misjudgments caused by other variables.
[0027] If the device employs both "operating current value ≥ A1" and "weight value ≥ B1" blockage determination logics simultaneously, cross-validation can be achieved. When both conditions are met, the reliability of the blockage determination is significantly improved, avoiding misjudgments caused by a single signal failure; if only one condition is met, the controller can trigger an early warning, facilitating troubleshooting of equipment anomalies.
[0028] In one optional implementation, when the controller receives a weight value that is greater than or equal to a second preset weight value B2, and B2 < B1, the controller controls the first switching valve and the second switching valve to open.
[0029] Beneficial effects: As the amount of salt crystals in the containment cavity increases, the weight value measured by the weighing pan also increases. When the weight value reaches B2, the controller determines that the amount of crystals has met the discharge conditions. At this time, the first switch valve and the second switch valve are opened simultaneously, so that the salt crystals in the containment cavity enter the feed end of the discharge pipe through the discharge port and are smoothly discharged along the discharge pipe. This ensures that the salt crystals are discharged in a timely manner when the accumulation is moderate and they are not clumped, avoiding the risk of subsequent blockage caused by excessive accumulation of salt crystals.
[0030] In one optional implementation, after the first switching valve and the second switching valve are opened, when the controller receives a weight value that is less than or equal to a third preset weight value B3, and B3 < B2, the controller controls the first switching valve to close.
[0031] Beneficial effects: When the weight value drops to B3, it indicates that most of the salt crystals have been discharged. At this point, closing the first switch valve ensures that the salt crystals are basically discharged and avoids excessive crystal slurry discharge due to continuous discharge. From "opening the first switch valve when the weight value is ≥ B2" to "closing the first switch valve when the weight value is ≤ B3", a complete closed loop of "starting discharge to stopping discharge" is formed. The controller can autonomously complete the discharge cycle without manual instructions, ensuring stable parameters during continuous operation and reducing system fluctuations caused by human error.
[0032] In one alternative embodiment, the bearing surface of the weighing pan is configured as an inclined surface, which is inclined from top to bottom toward the axis of the discharge port.
[0033] Beneficial effects: The inclined surface design allows salt crystals within the receiving cavity to slide naturally towards the discharge port under gravity, preventing salt crystals from accumulating on the bearing surface of the weighing pan and forming dead corners, such as those that may occur on horizontal bearing surfaces. Especially for salt crystals with poor flowability (such as salts that are prone to agglomeration or have high viscosity), the inclined structure can significantly reduce the amount of residue, ensuring that salt crystals enter the discharge pipe more concentratedly through the discharge port during discharge, reducing the probability of blockage caused by local accumulation.
[0034] In one optional implementation, when the third switching valve is opened, the third switching valve is maintained in the open state for a time t, which satisfies 10s≤t≤100s.
[0035] Beneficial effects: When the feed pipe is blocked, the controller controls the third switching valve to open for between 10 and 100 seconds to ensure that the gas can effectively clear the blockage. If the time is too short (e.g., <10 seconds), the gas may not have fully entered the target area or formed an effective flush, resulting in ineffective operation. If the time is too long, the gas used for clearing will be wasted due to prolonged discharge, increasing the operating cost of the equipment.
[0036] In one optional embodiment, the inflation mechanism includes a buffer tank and a booster, both of which are connected to the through-pipe. The booster is located between the third switch valve and the buffer tank. The buffer tank is used to store gas, and the booster is used to pressurize the gas in the through-pipe.
[0037] Beneficial effects: The buffer tank can pre-store a certain amount of gas. When the third switch valve is opened for unblocking, it can quickly release gas into the blocked pipe, avoiding gas supply interruptions caused by pressure fluctuations or insufficient flow of the gas source (such as an external gas supply pipeline), and ensuring that the gas continuously acts on the blocked area during the unblocking process. If the external gas source pressure is unstable (such as a sudden increase or decrease), the buffer tank can absorb the fluctuations through its own volume, making the gas pressure entering the booster more stable, providing a stable input basis for subsequent boosting stages, and avoiding abnormal output pressure of the booster due to sudden changes in input pressure.
[0038] Secondly, the present invention also provides a method for unclogging a waste liquid evaporation and crystallization device, comprising:
[0039] The controller determines whether the feed pipe is blocked;
[0040] When the controller detects a blockage in the discharge pipe, it controls one of the first and second switching valves to close and the other to open, and controls the third switching valve to open, so that the pressurized gas generated by the inflation mechanism enters the discharge pipe through the unblocking pipe to clear the blockage.
[0041] Beneficial effects: The unblocking method of this waste liquid evaporation crystallization device involves the controller controlling the first and second switching valves to a "one closed, one open" state when the controller detects a blockage in the feed pipe. Simultaneously, the third switching valve is opened, allowing pressurized gas generated by the aeration mechanism to enter the feed pipe through the unblocking pipe. The impact force of the gas clears the blockage. By setting up the unblocking pipe and the aeration mechanism, and using pressurized gas to directionally purge the blocked pipe, salt crystal blockage can be quickly removed, preventing the device from shutting down or interrupting operation due to blockage. This significantly improves the continuity and stability of operation and reduces efficiency losses caused by downtime maintenance.
[0042] In addition, the use of gas-based plugging eliminates the need for large amounts of flushing water, fundamentally reducing water waste and improving the overall water reuse rate of the device. It also avoids the extra energy consumption required for re-evaporation of materials containing moisture due to the injection of flushing water, reducing equipment maintenance costs related to water flushing, achieving energy conservation and consumption reduction, and lowering the economic cost of long-term operation.
[0043] Meanwhile, gas venting can prevent external pollutants that may be introduced by water flushing, effectively preventing impurities from affecting the materials inside the device; and through the linkage between the controller and each switching valve and stirring mechanism, the blockage detection and venting process are automated, eliminating the need for frequent manual intervention and reducing the difficulty of operation and labor intensity. Attached Figure Description
[0044] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0045] Figure 1 This is a schematic diagram of the waste liquid evaporation and crystallization device in one embodiment provided in this application;
[0046] Figure 2 This is a partial schematic diagram of the waste liquid evaporation crystallization device in one embodiment provided in this application;
[0047] Figure 3 yes Figure 2 A schematic diagram of the internal structure of the crystal slurry tank.
[0048] Explanation of reference numerals in the attached figures:
[0049] 100. Crystallization slurry tank; 110. Receiving cavity; 120. Stirring mechanism; 130. Discharge port;
[0050] 200, Feed pipe; 210, Feeding end; 220, Discharge end; 230, First switching valve; 240, Second switching valve;
[0051] 300, Unblocking pipe; 310, Air outlet; 320, Air inlet; 330, Third switch valve;
[0052] 400. Inflation mechanism; 410. Buffer tank; 420. Booster;
[0053] 500. Weighing pan; 510. Inclined surface;
[0054] 600. Centrifuge;
[0055] 700. Conveyor belt. Detailed Implementation
[0056] In related technologies, during the operation of waste liquid evaporation crystallization devices, the feed pipe is prone to blockage due to salt crystal deposition and adhesion, severely affecting the continuous operation of the system. When the feed pipe becomes blocked, flushing water is usually injected to clear the blockage. This not only consumes a large amount of water resources and reduces the water reuse rate, but also requires the material containing flushing water to be re-evaporated, increasing energy consumption. At the same time, the flushing water may introduce new impurities, affecting the purity of the crystallized salt, and cannot fundamentally prevent repeated blockages, leading to frequent system shutdowns for maintenance and high maintenance costs.
[0057] During the research and development process of this application, to avoid water waste during the unblocking of pipes, the team initially attempted to improve the process by "reducing water volume and increasing water pressure": reducing water consumption by decreasing the injection volume while increasing water pressure to break up blockages using the impact force of high-pressure water flow. This solution alleviated the water waste problem to some extent, and the high-pressure water flow had a more direct flushing effect on agglomerated salt crystals, thus improving unblocking efficiency.
[0058] However, new problems arise: despite the reduced water volume, the flushing water itself inevitably introduces trace impurities. For example, if industrial tap water is used as the flushing source, calcium and magnesium ions in the water may combine with sulfate ions in the crystallization system to form new precipitates (such as calcium sulfate), which are then mixed into the target sodium sulfate crystals. If the flushing water has come into contact with uncleaned pipes, it may also introduce rust, silt, and other particulate matter. These impurities directly affect the purity of the crystallized salt, causing the product to fail to meet industrial reuse standards, and even requiring additional purification processes, which in turn increases process costs.
[0059] Based on this, the inventors of this application have redesigned the waste liquid evaporation and crystallization device. When the controller detects a blockage in the feed pipe, it controls the first and second switching valves to a "one closed, one open" state, while simultaneously opening the third switching valve. This allows pressurized gas generated by the aeration mechanism to enter the feed pipe through the unblocking pipe, clearing the blockage under the impact force of the gas. By setting up the unblocking pipe and the aeration mechanism, and using pressurized gas to directionally purge the blocked pipe, salt crystal blockage can be quickly removed, preventing the device from shutting down or interrupting operation due to blockage. This significantly improves the continuity and stability of operation and reduces efficiency losses caused by downtime maintenance.
[0060] In addition, the use of gas-based plugging eliminates the need for large amounts of flushing water, fundamentally reducing water waste and improving the overall water reuse rate of the device. It also avoids the extra energy consumption required for re-evaporation of materials containing moisture due to the injection of flushing water, reducing equipment maintenance costs related to water flushing, achieving energy conservation and consumption reduction, and lowering the economic cost of long-term operation.
[0061] Meanwhile, gas venting can prevent external pollutants that may be introduced by water flushing, effectively preventing impurities from affecting the materials inside the device; and through the linkage between the controller and each switching valve and stirring mechanism, the blockage detection and venting process are automated, eliminating the need for frequent manual intervention and reducing the difficulty of operation and labor intensity.
[0062] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this application, but not all embodiments.
[0063] The following is combined Figures 1 to 3 The following describes embodiments of the present invention.
[0064] According to embodiments of the present invention, in one aspect, such as Figures 1 to 3 As shown, a waste liquid evaporation crystallization device is provided, including a crystal slurry tank 100, a feed pipe 200, a plugging pipe 300, and a controller (not shown in the figure).
[0065] Specifically, such as Figure 1 and Figure 2 As shown, the crystal slurry tank 100 has a receiving cavity 110, which is suitable for containing materials. A stirring mechanism 120 is installed in the receiving cavity 110 to stir the materials in the receiving cavity 110. The bottom of the crystal slurry tank 100 has a discharge port 130, which is connected to the receiving cavity 110.
[0066] Specifically, such as Figure 1 and Figure 2 As shown, the feed pipe 200 has an inlet end 210 and an outlet end 220. The inlet end 210 of the feed pipe 200 is connected to the discharge port 130 of the crystal slurry tank 100, and the outlet end 220 of the feed pipe 200 is connected to external equipment. The salt crystals analyzed in the crystal slurry tank 100 are transported to the external equipment through the feed pipe 200. Along the material conveying direction of the feed pipe 200, a first switching valve 230 and a second switching valve 240 are sequentially spaced on the feed pipe 200.
[0067] Specifically, such as Figure 1 and Figure 2 As shown, the plugging pipe 300 has an outlet end 310 and an inlet end 320. The outlet end 310 of the plugging pipe 300 is connected to the feed pipe 200, and the outlet end 310 is connected to the pipe section between the first switching valve 230 and the second switching valve 240 of the feed pipe 200. The inlet end 320 of the plugging pipe 300 is connected to the inflation mechanism 400, and a third switching valve 330 is provided on the plugging pipe 300.
[0068] Specifically, the controller is electrically connected to the stirring mechanism 120, the first switching valve 230, the second switching valve 240 and the third switching valve 330 respectively.
[0069] Specifically, such as Figure 1 and Figure 2 As shown, when the controller detects that the feed pipe 200 is blocked, the controller controls one of the first switch valve 230 and the second switch valve 240 to close and the other to open, and controls the third switch valve 330 to open, so that the pressurized gas generated by the inflation mechanism 400 enters the feed pipe 200 through the unblocking pipe 300 and clears the blockage in the feed pipe 200.
[0070] In this waste liquid evaporation and crystallization device, the second switch valve 240 on the feed pipe 200 is normally kept open during operation. When a large amount of salt crystals precipitate in the receiving cavity 110 of the crystal slurry tank 100, the controller will automatically open the first switch valve 230, allowing the salt crystals to enter the feed end 210 of the feed pipe 200 through the discharge port 130. Since the first switch valve 230 and the second switch valve 240 are open at this time, the salt crystals can smoothly pass through the feed pipe 200 and be transported to external equipment from the discharge end 220, realizing the automated discharge of the device.
[0071] When the controller detects a blockage in the feed pipe 200, it controls the first switching valve 230 and the second switching valve 240 to a "one closed, one open" state, while simultaneously opening the third switching valve 330. This allows pressurized gas generated by the inflation mechanism 400 to enter the feed pipe 200 through the unblocking pipe 300. The impact force of the gas clears the blockage. By using the unblocking pipe 300 and the inflation mechanism 400, pressurized gas can be used to directionally purge the blocked pipe, quickly removing salt crystal blockages. This prevents the device from shutting down or interrupting operation due to blockages, significantly improving the continuity and stability of operation and reducing efficiency losses caused by downtime maintenance.
[0072] In addition, the use of gas-based plugging eliminates the need for large amounts of flushing water, fundamentally reducing water waste and improving the overall water reuse rate of the device. It also avoids the extra energy consumption required for re-evaporation of materials containing moisture due to the injection of flushing water, reducing equipment maintenance costs related to water flushing, achieving energy conservation and consumption reduction, and lowering the economic cost of long-term operation.
[0073] Meanwhile, gas venting can prevent external pollutants that may be introduced by water flushing, effectively preventing impurities from affecting the materials inside the device; and through the linkage between the controller and each switch valve and the stirring mechanism 120, the blockage detection and venting process are automated, eliminating the need for frequent manual intervention and reducing the difficulty of operation and labor intensity.
[0074] Specifically, by closing the first switch valve 230 near the crystal slurry tank 100 and opening the second switch valve 240, pressurized gas can be directed to the blocked area, forming a one-way airflow channel from the access point of the unblocking pipe 300 to the discharge end 220, so that the high-pressure gas is concentrated on the blocked part, avoiding the gas backflow impacting the material in the crystal slurry tank 100, and greatly improving the unblocking effect.
[0075] During the unblocking process, the strategy of closing the second switching valve 240 and opening the first switching valve 230 is suitable for scenarios where the blockage point is close to the discharge end 220. In this case, pressurized gas can accumulate higher pressure in a smaller space, achieving rapid unblocking with lower gas consumption.
[0076] By controlling the first switching valve 230 and the second switching valve 240 in stages, the unblocking operation can be limited to a local area of the feed pipe 200, without having to completely empty the crystal slurry tank 100 or interrupt the operation of the entire system.
[0077] Specifically, the material can be the liquid to be treated, waste liquid, etc. For example, the material can be high-salt concentrate, high-salt mother liquor, etc. In this embodiment of the application, the type of material is not specifically limited.
[0078] Specifically, the stirring mechanism 120 can be a paddle mixer, an anchor mixer, a ribbon mixer, etc. In this embodiment, the type of stirring mechanism 120 is not specifically limited.
[0079] For example, the stirring mechanism 120 is a paddle mixer, which consists of a horizontal paddle and a rotating shaft. The paddle is designed to be close to the conical bottom of the crystal slurry tank 100, which can effectively stir the salt crystals deposited at the bottom of the tank and prevent local crystallization from clogging the discharge port 130. It has a simple structure, is easy to maintain, and is suitable for long-term operation in high-salt environments.
[0080] Specifically, the first switching valve 230, the second switching valve 240, and the third switching valve 330 can be selected from pneumatic ball valves, pneumatic diaphragm valves, plug valves, etc. In this embodiment, no specific restrictions are placed on the type of switching valve.
[0081] Specifically, such as Figure 1 As shown, the external equipment can be a centrifuge 600 and a conveyor belt 700. The crystal slurry containing crystals is transported to the centrifuge 600 through the feed pipe 200. The solid-liquid separation is achieved by centrifugal force, separating the salt crystals from the mother liquor. The separated mother liquor can be returned to the evaporation crystallization device for reprocessing, while the salt crystals enter the conveyor belt 700 for subsequent drying.
[0082] Specifically, the inflation mechanism 400 can be an air source device, a pressurizing device, a buffer device, etc. In this embodiment, the type of inflation mechanism 400 is not specifically limited.
[0083] Specifically, the controller can be an existing controller such as a PLC (Programmable Logic Controller), a microcontroller, or a computer control system. In this embodiment, no specific restrictions are placed on the type of controller.
[0084] In one embodiment, such as Figure 1 and Figure 2As shown, when the controller detects a blockage in the feed pipe 200, the controller first controls the first switching valve 230 to close, the second switching valve 240 to open, and the third switching valve 330 to open, then controls the first switching valve 230 to open and the second switching valve 240 to close; or, when the controller detects a blockage in the feed pipe 200, the controller first controls the first switching valve 230 to open, the second switching valve 240 to close, and the third switching valve 330 to open, then controls the first switching valve 230 to close and the second switching valve 240 to open.
[0085] When blockage occurs in the feed pipe 200, the blockage may occur in different locations. The controller first closes the first switching valve 230 and opens the second switching valve 240, allowing gas to purge from the connection point of the unblocking pipe 300 to the discharge end 220, thus clearing the blockage in the downstream section of the feed pipe 200. Subsequently, the controller switches to opening the first switching valve 230 and closing the second switching valve 240, allowing gas to purge towards the feed end 210, clearing the blockage in the upstream section of the feed pipe 200. Similarly, the upstream blockage can be cleared first, and then the direction can be switched to clear the downstream blockage. This bidirectional alternating purging can cover the entire feed pipe 200 without dead angles, and is particularly effective for clearing multi-point blockages or long-section blockages, achieving comprehensive coverage of the blocked area and improving the success rate of unblocking.
[0086] It should be noted that when the upstream section of the feed pipe 200 is blocked, the controller controls the first switching valve 230 to open and the second switching valve 240 to close, and gas is blown from the connection point of the unblocking pipe 300 to the feed end 210. After the blockage is cleared, the gas enters the discharge port 130 through the feed end 210 of the feed pipe 200, so that the gas enters the receiving cavity 110, and at this time the gas can flow out from the overflow port of the crystal slurry tank 100.
[0087] In one embodiment, such as Figure 1 and Figure 2 As shown, the stirring mechanism 120 is used to send the operating current value of the stirring mechanism 120 to the controller. When the controller determines that the feeding pipe 200 is blocked based on the received operating current value being greater than or equal to the first preset current value A1.
[0088] When the feed pipe 200 becomes blocked, the salt crystals in the receiving cavity 110 cannot be discharged smoothly, leading to an increase in salt crystals and stirring resistance within the cavity 110. To maintain normal rotation speed, the stirring mechanism 120 requires increased motor output power, which is reflected in a significant increase in operating current. The current change is positively correlated with the degree of blockage (the more severe the blockage, the greater the resistance, and the higher the current), and the response speed is extremely fast, allowing the controller to detect the blockage as soon as it occurs, thus buying time for subsequent unblocking actions and preventing further deterioration of the blockage.
[0089] Furthermore, by directly utilizing the built-in current monitoring function of the stirring mechanism 120, blockages can be indirectly determined through current changes, eliminating the need for additional hardware and significantly reducing equipment investment and installation and commissioning costs. This makes it particularly suitable for upgrading existing equipment.
[0090] Specifically, the current signal is a direct feedback of the operating status of the stirring mechanism 120, and is not affected by the properties of the material (such as the high corrosiveness and high viscosity of sodium sulfate crystals) or environmental factors (such as high temperature and high humidity). Compared with pressure sensors that rely on medium transmission (which are prone to failure due to crystallization) and optical sensors (which are susceptible to dust interference), current detection is more stable.
[0091] Specifically, in addition to detecting blockages, abnormal fluctuations in the operating current of the mixing mechanism can also indicate other potential problems, such as impeller wear and abnormal bearing noise, providing data support for preventive maintenance of the equipment and avoiding the risk of greater downtime due to the accumulation of small faults.
[0092] In one embodiment, such as Figure 1 and Figure 2 As shown, when the controller receives an operating current value that is greater than or equal to the second preset current value A2, and A2 < A1, the controller controls the first switching valve 230 and the second switching valve 240 to open.
[0093] As the amount of salt crystals in the containment chamber 110 increases, the operating resistance of the stirring mechanism 120 increases accordingly, which is reflected in an increase in the operating current value. When the operating current value reaches A2, the controller determines that the amount of crystals has met the discharge conditions. At this time, the first switching valve 230 and the second switching valve 240 are opened simultaneously, so that the salt crystals in the containment chamber 110 enter the feed end 210 of the discharge pipe 200 through the discharge port 130 and are smoothly discharged along the discharge pipe 200. This ensures that the salt crystals are discharged in a timely manner with a moderate accumulation and without clumping, avoiding the risk of subsequent blockage caused by excessive accumulation of salt crystals.
[0094] Without the need for manual observation or operation, the controller automatically completes the entire process of judging the amount of salt crystals, opening the first switching valve 230, and discharging the material by monitoring the operating current signal. This reduces the intensity of manual labor and avoids human judgment errors, making the salt crystal discharge process closely match the overall operating rhythm of the evaporation and crystallization device, thereby improving the continuity and stability of the process.
[0095] In one embodiment, such as Figure 1 and Figure 2 As shown, after the first switching valve 230 and the second switching valve 240 are opened, when the controller receives an operating current value that is less than or equal to a third preset current value A3, and A3 < A2, the controller controls the first switching valve 230 to close.
[0096] When there are many salt crystals, the stirring resistance of the stirring mechanism 120 is high, and the operating current value is high (≥A2). As the discharge proceeds, the amount of salt crystals decreases, the resistance decreases, and the operating current value gradually decreases. When the operating current value drops to A3 (below the threshold of A2), it indicates that the salt crystals in the receiving cavity 110 have been basically discharged. The controller uses this as a signal to close the first switching valve 230, which can accurately match the discharge progress and avoid the secondary accumulation of residual salt crystals caused by prematurely closing the first switching valve 230. If the valve is closed before the operating current value reaches A3, a large amount of salt crystals may still remain in the receiving cavity 110.
[0097] In one embodiment, such as Figure 1 and Figure 2 As shown, the waste liquid evaporation and crystallization device also includes a weighing pan 500, which is installed at the bottom of the receiving cavity 110 and is electrically connected to the controller. The weighing pan 500 is used to weigh the material in the receiving cavity 110 and send the weight value to the controller. When the controller determines that the feed pipe 200 is blocked based on the received weight value being greater than or equal to a first preset weight value B1.
[0098] The weighing pan 500 directly weighs the total weight of the material in the receiving chamber 110. When the discharge pipe 200 is blocked, the salt crystals in the receiving chamber 110 cannot be discharged normally and will continue to accumulate, causing the weight value to rise continuously. When the weight value reaches B1, the controller can clearly determine that the discharge pipe 200 is blocked. Compared with monitoring the weight signal solely through the operating current value of the stirring mechanism 120, this method more directly corresponds to the actual accumulation of salt crystals and reduces misjudgments caused by other variables.
[0099] If the device uses both "operating current value ≥ A1" and "weight value ≥ B1" blockage detection logics simultaneously, cross-validation can be achieved. When both conditions are met, the reliability of the blockage detection is greatly improved, avoiding misjudgments caused by a single signal failure; if only one condition is met, the controller can trigger an early warning (rather than directly determining blockage), which facilitates troubleshooting equipment abnormalities (e.g., high current but weight not reaching B1, which may be due to a foreign object stuck in the stirring mechanism 120 rather than a blockage in the feed pipe 200).
[0100] In one embodiment, such as Figure 1 and Figure 2 As shown, when the controller receives a weight value that is greater than or equal to the second preset weight value B2, and B2 < B1, the controller controls the first switching valve 230 and the second switching valve 240 to open.
[0101] As the amount of salt crystals in the receiving cavity 110 increases, the weight value measured by the weighing pan 500 also increases. When the weight value reaches B2, the controller determines that the amount of crystals has met the discharge conditions. At this time, the first switch valve 230 and the second switch valve 240 are opened simultaneously, so that the salt crystals in the receiving cavity 110 enter the feed end 210 of the discharge pipe 200 through the discharge port 130 and are smoothly discharged along the discharge pipe 200. This ensures that the salt crystals are discharged in a timely manner when the accumulation is moderate and they are not clumped, avoiding the risk of subsequent blockage caused by excessive accumulation of salt crystals.
[0102] Without the need for manual observation or operation, the controller automatically completes the entire process of judging the amount of salt crystals, opening the first switching valve 230, and discharging the material by using the weight value signal as a monitoring indicator. This reduces the intensity of manual labor and avoids human judgment errors, making the salt crystal discharge process closely match the overall operating rhythm of the evaporation and crystallization device, thereby improving the continuity and stability of the process.
[0103] If the device adopts a dual triggering mechanism of "operating current value ≥ A2" and "weight value ≥ B2" at the same time, the reliability of material discharge control can be further improved.
[0104] In one embodiment, such as Figure 1 and Figure 2 As shown, after the first switch valve 230 and the second switch valve 240 are opened, when the controller receives a weight value that is less than or equal to a third preset weight value B3, and B3 < B2, the controller controls the first switch valve 230 to close.
[0105] When the weight value drops to B3, it indicates that most of the salt crystals have been discharged. At this point, closing the first switch valve 230 ensures that the salt crystals are basically discharged and prevents excessive crystal slurry discharge due to continuous discharge. From "opening the first switch valve 230 when the weight value is ≥ B2" to "closing the first switch valve 230 when the weight value is ≤ B3", a complete closed loop of "starting discharge to stopping discharge" is formed. The controller can autonomously complete the discharge cycle without manual instructions, ensuring stable parameters during continuous operation and reducing system fluctuations caused by human error.
[0106] In one embodiment, such as Figure 3 As shown, the bearing surface of the weighing pan 500 is set as an inclined surface 510, wherein the inclined surface 510 is inclined from top to bottom toward the axis of the discharge port 130.
[0107] The inclined surface 510 design allows the salt crystals in the receiving cavity 110 to slide naturally towards the discharge port 130 under the action of gravity, avoiding the accumulation of salt crystals on the bearing surface of the weighing pan 500 and the formation of dead corners, such as the corner residues that may occur on a horizontal bearing surface. Especially for salt crystals with poor flowability (such as salts that are prone to agglomeration and have high viscosity), the inclined structure can significantly reduce the amount of residue, ensuring that the salt crystals enter the discharge pipe 200 through the discharge port 130 more concentratedly during discharge, reducing the probability of blockage caused by local accumulation.
[0108] The inclined surface 510 promotes the rapid discharge of crystals, allowing the weight value in the receiving cavity 110 to reach the threshold of "≤B3" more quickly, thereby triggering the first switching valve 230 to close in time, shortening the discharge cycle and saving time for the next crystallization process.
[0109] Specifically, if the bearing surface is horizontal, the salt crystals may cause uneven force on the weighing pan 500 due to differences in their stacking morphology (such as one side being higher and the other side being lower), affecting the accuracy of weight detection. The inclined surface 510 guides the material to gather towards the discharge port 130 (usually the center or a fixed area of the weighing pan 500), so that the weight of the material acts more concentratedly on the core sensing area of the weighing pan 500, reducing measurement errors caused by uneven distribution.
[0110] It should be noted that the bearing surface of the weighing pan 500 can be understood as the surface of the weighing pan 500 that directly contacts the substances (such as waste liquid or precipitated salt crystals) in the receiving cavity 110. It needs to support the weight of these substances and transmit the weight to the sensor of the weighing pan 500 to ultimately achieve weight detection.
[0111] Specifically, the inclined surface 510 can be an arc-shaped inclined surface or a plane with a certain inclination angle. In this embodiment, the type of inclined surface 510 is not specifically limited.
[0112] In one embodiment, when the third switching valve 330 is opened, the third switching valve 330 is maintained in the open state for a time t, which satisfies 10s≤t≤100s.
[0113] When the feed pipe 200 becomes clogged, the controller controls the third switching valve 330 to open for between 10 and 100 seconds to ensure that the gas can effectively clear the clogged area. If the time is too short (e.g., <10 seconds), the gas may not have fully entered the target area or formed an effective flush, resulting in ineffective operation. If the time is too long, the gas used for clearing will be wasted due to prolonged discharge, increasing the operating cost of the equipment.
[0114] In one embodiment, such as Figure 1As shown, the inflation mechanism 400 includes a buffer tank 410 and a booster 420. Both the buffer tank 410 and the booster 420 are connected to the through-pipe 300. The booster 420 is located between the third switch valve 330 and the buffer tank 410. The buffer tank 410 is used to store gas, and the booster 420 is used to pressurize the gas in the through-pipe 300.
[0115] The buffer tank 410 can pre-store a certain amount of gas. When the third switch valve 330 is opened for unblocking, it can quickly release gas into the unblocking pipe 300, avoiding gas supply interruption due to pressure fluctuations or insufficient flow of the gas source (such as an external gas supply pipeline), and ensuring that the gas continuously acts on the blocked area during the unblocking process. If the external gas source pressure is unstable (such as a sudden increase or decrease), the buffer tank 410 can absorb the fluctuations through its own volume, making the gas pressure entering the booster 420 more stable, providing a stable input basis for the subsequent boosting stage, and avoiding abnormal output pressure of the booster 420 due to sudden changes in input pressure.
[0116] The blockage in the feed pipe 200 may be caused by viscous materials (such as crystalline salt blocks, sticky waste liquid residues), which may not be effectively dispersed by ordinary air pressure. The booster 420 can pressurize the gas, giving the gas output from the unblocking pipe 300 higher kinetic energy (such as high-pressure airflow), breaking down the structure of the blockage through strong impact, and is especially suitable for solving harder or denser blockages.
[0117] Specifically, the output pressure of the booster 420 is adjustable. For example, by adjusting the power through the controller, the gas pressure can be flexibly adjusted according to the severity of the blockage (lower pressure for minor blockages and higher pressure for severe blockages), avoiding the problems of "insufficient pressure to clear blockages" or "excessive pressure damaging pipelines".
[0118] Specifically, the pressurized gas can be compressed air, nitrogen, etc. In this embodiment, the type of gas is not specifically limited.
[0119] The operating principle of the waste liquid evaporation crystallization device in this embodiment is described as follows:
[0120] 1. When the salt crystals in the crystal slurry tank 100 reach a certain amount, the controller opens the first switch valve 230 to achieve automatic discharge:
[0121] When the operating current reaches A2 and the weight reaches B2, the controller determines that the amount of crystals meets the discharge conditions. At this time, the first switch valve 230 and the second switch valve 240 are opened simultaneously, so that the salt crystals in the receiving cavity 110 enter the feed end 210 of the discharge pipe 200 through the discharge port 130 and are smoothly discharged along the discharge pipe 200. This ensures that the salt crystals are discharged in a timely manner with a moderate accumulation and without clumping, avoiding the risk of subsequent blockage caused by excessive accumulation of salt crystals.
[0122] The controller automatically completes the entire process of judging the amount of salt crystals, opening the first switching valve 230, and discharging the material. This reduces the intensity of manual labor and avoids human judgment errors, making the salt crystal discharge process closely match the overall operating rhythm of the evaporation and crystallization device, thus improving the continuity and stability of the process.
[0123] 2. After a certain amount of salt crystals are discharged from the crystal slurry tank 100, the controller closes the first switch valve 230, thus completing the discharge process from start to finish.
[0124] When the operating current value drops to A3 and the weight value drops to B3, it indicates that the salt crystals in the containment chamber 110 have been basically discharged. The controller uses this as a signal to close the first switching valve 230, which can accurately match the discharge progress. The controller can complete the discharge cycle autonomously without manual instructions, ensuring that the parameters of the equipment are stable during continuous operation and reducing system fluctuations caused by differences in human operation.
[0125] 3. How does the controller detect blockage in the feed pipe 200?
[0126] When the operating current value received by the controller is greater than or equal to the first preset current value A1, and the weight value received by the controller is greater than or equal to the first preset weight value B1, the controller can clearly determine that the feed pipe 200 is blocked.
[0127] 4. How to unclog the feed pipe when it is blocked at 200mm:
[0128] When blockage occurs in the feed pipe 200, the blockage may occur in different locations. The controller first closes the first switching valve 230 and opens the second switching valve 240, allowing gas to purge from the connection point of the unblocking pipe 300 to the discharge end 220, thus clearing the blockage in the downstream section of the feed pipe 200. Subsequently, the controller switches to opening the first switching valve 230 and closing the second switching valve 240, allowing gas to purge towards the feed end 210, clearing the blockage in the upstream section of the feed pipe 200. Similarly, the upstream blockage can be cleared first, and then the direction can be switched to clear the downstream blockage. This bidirectional alternating purging can cover the entire feed pipe 200 without dead angles, and is particularly effective for clearing multi-point blockages or long-section blockages, achieving comprehensive coverage of the blocked area and improving the success rate of unblocking.
[0129] According to an embodiment of the present invention, on the other hand, such as Figures 1 to 3 As shown, a method for unclogging a waste liquid evaporation crystallization device is also provided, applicable to the waste liquid evaporation crystallization device, the method comprising:
[0130] The controller determines whether the feed pipe 200 is blocked.
[0131] When the controller detects a blockage in the discharge pipe 200, it controls one of the first switching valve 230 and the second switching valve 240 to close and the other to open, and controls the third switching valve 330 to open, so that the pressurized gas generated by the inflation mechanism 400 enters the discharge pipe 200 through the unblocking pipe 300 to clear the blockage.
[0132] The unblocking method of this waste liquid evaporation crystallization device involves the controller detecting a blockage in the feed pipe 200. When this blockage is detected, the controller activates the first and second switching valves 230 and 240 respectively, simultaneously opening the third switching valve 330. This allows pressurized gas generated by the aeration mechanism 400 to enter the feed pipe 200 through the unblocking pipe 300. The impact force of the gas clears the blockage. By using the unblocking pipe 300 and the aeration mechanism 400, pressurized gas can be used to directionally purge the blocked pipe, quickly removing salt crystal blockages. This prevents the device from shutting down or interrupting operation due to blockages, significantly improving operational continuity and stability, and reducing efficiency losses caused by downtime maintenance.
[0133] In addition, the use of gas-based plugging eliminates the need for large amounts of flushing water, fundamentally reducing water waste and improving the overall water reuse rate of the device. It also avoids the extra energy consumption required for re-evaporation of materials containing moisture due to the injection of flushing water, reducing equipment maintenance costs related to water flushing, achieving energy conservation and consumption reduction, and lowering the economic cost of long-term operation.
[0134] Meanwhile, gas venting can prevent external pollutants that may be introduced by water flushing, effectively preventing impurities from affecting the materials inside the device; and through the linkage between the controller and each switch valve and the stirring mechanism 120, the blockage detection and venting process are automated, eliminating the need for frequent manual intervention and reducing the difficulty of operation and labor intensity.
[0135] The terms "upper" and "lower" are used to describe the relative positions of the various structures in the accompanying drawings. They are only for clarity of description and are not intended to limit the scope of implementation of this application. Any changes or adjustments to the relative positions without substantially altering the technical content shall also be considered within the scope of implementation of this application.
[0136] It should be noted that, in this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0137] Furthermore, in this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0138] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0139] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.
Claims
1. A waste liquid evaporation and crystallization device, characterized in that, include: The crystal slurry tank (100) has a receiving cavity (110) for containing materials. The receiving cavity (110) is equipped with a stirring mechanism (120). The bottom of the crystal slurry tank (100) is provided with a discharge port (130) that communicates with the receiving cavity (110). The feeding pipe (200) has a feeding end (210) and a discharging end (220). The feeding end (210) is connected to the unloading port (130), and the discharging end (220) is connected to external equipment. Along the material conveying direction of the feeding pipe (200), a first switching valve (230) and a second switching valve (240) are sequentially spaced on the feeding pipe (200). The unblocking pipe (300) has an air outlet (310) and an air inlet (320). The air outlet (310) is connected to the pipe section between the first switch valve (230) and the second switch valve (240) of the feed pipe (200). The air inlet (320) is connected to the inflation mechanism (400). The unblocking pipe (300) is provided with a third switch valve (330). The controller is electrically connected to the stirring mechanism (120), the first switching valve (230), the second switching valve (240), and the third switching valve (330), respectively. When the controller detects that the feed pipe (200) is blocked, the controller controls one of the first switch valve (230) and the second switch valve (240) to close and the other to open, and controls the third switch valve (330) to open, so that the pressurized gas generated by the inflation mechanism (400) enters the feed pipe (200) through the unblocking pipe (300) to clear the blockage.
2. The waste liquid evaporation and crystallization apparatus according to claim 1, characterized in that, When the controller detects that the feed pipe (200) is blocked, the controller first controls the first switching valve (230) to close, the second switching valve (240) to open, and controls the third switching valve (330) to open, and then controls the first switching valve (230) to open and the second switching valve (240) to close. Alternatively, when the controller detects that the feed pipe (200) is blocked, the controller first controls the first switching valve (230) to open, the second switching valve (240) to close, and controls the third switching valve (330) to open, and then controls the first switching valve (230) to close and the second switching valve (240) to open.
3. The waste liquid evaporation and crystallization apparatus according to claim 2, characterized in that, The stirring mechanism (120) is used to send the operating current value of the stirring mechanism (120) to the controller. When the controller determines that the feeding pipe (200) is blocked based on the received operating current value being greater than or equal to the first preset current value A1.
4. The waste liquid evaporation and crystallization apparatus according to claim 3, characterized in that, When the controller receives the operating current value which is greater than or equal to the second preset current value A2, and A2 < A1, the controller controls the first switching valve (230) and the second switching valve (240) to open.
5. The waste liquid evaporation and crystallization apparatus according to claim 4, characterized in that, After the first switching valve (230) and the second switching valve (240) are opened, when the controller receives the operating current value which is less than or equal to the third preset current value A3, and A3 < A2, the controller controls the first switching valve (230) to close.
6. The waste liquid evaporation and crystallization apparatus according to any one of claims 2 to 5, characterized in that, The waste liquid evaporation crystallization device also includes a weighing pan (500), which is located at the bottom of the receiving cavity (110) and is electrically connected to the controller. The weighing pan (500) is used to send the weight value of the material in the receiving cavity (110) to the controller. When the controller determines that the receiving weight value is greater than or equal to the first preset weight value B1, the feeding pipe (200) is blocked.
7. The waste liquid evaporation and crystallization apparatus according to claim 6, characterized in that, When the controller receives a weight value that is greater than or equal to a second preset weight value B2, and B2 < B1, the controller controls the first switching valve (230) and the second switching valve (240) to open.
8. The waste liquid evaporation and crystallization apparatus according to claim 7, characterized in that, After the first switching valve (230) and the second switching valve (240) are opened, when the controller controls the first switching valve (230) to close based on the received weight value being less than or equal to a third preset weight value B3, and B3 < B2.
9. The waste liquid evaporation and crystallization apparatus according to claim 6, characterized in that, The bearing surface of the weighing pan (500) is set as an inclined surface (510), which is inclined from top to bottom toward the axis of the discharge port (130).
10. The waste liquid evaporation and crystallization apparatus according to claim 6, characterized in that, When the third switching valve (330) is opened, the third switching valve (330) is maintained in the open state for a time t, which satisfies 10s≤t≤100s.
11. The waste liquid evaporation and crystallization apparatus according to claim 6, characterized in that, The inflation mechanism (400) includes a buffer tank (410) and a booster (420). Both the buffer tank (410) and the booster (420) are connected to the unblocking pipe (300). The booster (420) is located between the third switch valve (330) and the buffer tank (410). The buffer tank (410) is used to store gas, and the booster (420) is used to pressurize the gas in the unblocking pipe (300).
12. A method for unclogging a waste liquid evaporation and crystallization device, characterized in that, The method, applied to the waste liquid evaporation and crystallization apparatus according to any one of claims 1 to 11, comprises: The controller determines whether the feed pipe (200) is blocked; When the controller detects that the feed pipe (200) is blocked, the controller controls one of the first switch valve (230) and the second switch valve (240) to close and the other to open, and controls the third switch valve (330) to open, so that the pressurized gas generated by the inflation mechanism (400) enters the feed pipe (200) through the unblocking pipe (300) to clear the blockage.