A device for detecting the moisture content of residue in a distillation vessel, a slag discharge control device, and a slag discharge control method.

Abstract

This invention provides a device for detecting the moisture content of residue in a distillation vessel, a slag discharge control device, and a slag discharge control method. It can effectively detect the moisture content of residue in the distillation vessel, facilitating slag discharge when a suitable moisture content is detected, ensuring stable and timely slag discharge. The distillation vessel is equipped with a stirring shaft and a stirring reducer. The stirring reducer and stirring shaft are connected by a chain drive. A chain tensioner is provided on one side of the chain, and the chain tensioner tensions the chain through a tensioning wheel. The invention is characterized by several sensors spaced apart along the movable direction of the tensioning wheel. As the moisture content of the residue in the distillation vessel decreases, the stirring resistance increases, and the chain gradually straightens, pushing the tensioning wheel so that the tensioning wheel passes each sensor in turn. The sensors can sense the tensioning wheel and emit a sensing signal. Sensors at different positions correspond to different moisture contents of the residue in the distillation vessel.

Description

Technical Field

[0001] This invention relates to the field of distillation kettle residue discharge control technology, specifically to a device for detecting the moisture content of residue in a distillation kettle, a residue discharge control device, and a residue discharge control method. Background Technology

[0002] A distillation vessel is a reaction vessel used in the distillation of industrial wastewater. Its main function is to separate different components in a mixture based on their boiling point differences through heating. Distillation vessels can effectively treat industrial wastewater. During the treatment process, the industrial wastewater is heated, and components with lower boiling points first vaporize into a gaseous state. After condensation and cooling, they become liquid and are collected. During distillation, as the mixture evaporates, high-boiling-point, non-volatile solid impurities and residues gradually accumulate at the bottom of the distillation vessel. If not discharged in time, these non-volatile solid impurities and residues will gradually accumulate at the bottom of the distillation vessel, clogging components such as the discharge port, pipes, and agitators, affecting the normal operation of the equipment. Discharging residues when their moisture content is high will increase the customer's industrial wastewater treatment costs.

[0003] In existing technologies, time-based control of slag discharge is typically employed. Specifically, after the evaporation-to-drainage interval reaches a set value, the system enters a re-distillation mode. Once the set re-distillation time is reached, the system enters a slag discharge mode to discharge the slag.

[0004] However, in actual production, the concentration of the raw liquid often fluctuates, while the set time is a fixed value determined based on experience. This may result in entering the slag discharge mode too early or too late, potentially leading to excessively high or low moisture content in the discharged slag. The time-based method used in existing technologies is highly dependent on the operator's experience. Even experienced operators cannot guarantee that the set time will accurately adapt to various production conditions each time. Uncertainty in the time setting or untimely slag discharge can lead to equipment blockage, or premature slag discharge can result in the loss of incompletely distilled material. Therefore, its reliability is poor when facing various complex production situations.

[0005] Furthermore, the environment inside a distillation vessel is typically harsh, potentially containing corrosive gases and liquids, which significantly impacts moisture content detection sensors. Using conventional moisture content sensors can easily lead to inaccurate measurements or sensor damage. Moreover, installing a moisture content sensor on the distillation vessel requires consideration of the vessel's structure and process requirements; improper installation can affect measurement results. Measuring the sensor during distillation is also challenging; ideally, the process would require stopping the distillation process, which is impractical in real-world applications and hinders processing progress. Summary of the Invention

[0006] To address the aforementioned problems, this invention provides a device for detecting the moisture content of residue in a distillation vessel, a slag discharge control device, and a slag discharge control method. These methods can effectively detect the moisture content of residue in the distillation vessel, facilitating the initiation of slag discharge when a suitable moisture content is detected, and ensuring stable and timely slag discharge.

[0007] The technical solution is as follows: a device for detecting the moisture content of residue in a distillation vessel, the distillation vessel being equipped with a stirring shaft and a stirring reducer, the stirring reducer being connected to the stirring shaft via a chain drive, a chain tensioner being provided on one side of the chain, the chain tensioner tensioning the chain via a tensioning wheel, characterized in that a plurality of sensors are spaced apart along the movable direction of the tensioning wheel, as the moisture content of the residue in the distillation vessel decreases and the stirring resistance increases, the chain gradually straightens and pushes the tensioning wheel back, causing the tensioning wheel to pass through the sensors one by one, the sensors being able to sense the tensioning wheel emitting a sensing signal, and the sensors at different positions corresponding to different moisture contents of the residue in the distillation vessel.

[0008] Furthermore, the sensor is set at the same height.

[0009] Furthermore, when the tension wheel is pushed back to directly above the sensor, the distance between the lowest point of the tension wheel and the sensor is less than the sensing threshold, and the sensor can detect the sensing signal emitted by the tension wheel.

[0010] Furthermore, a driven sprocket is installed on the stirring shaft, and a driving sprocket is installed on the output shaft of the reducer. The driving sprocket and the driven sprocket are connected by a chain.

[0011] Furthermore, the different sensors emit signals corresponding to different moisture contents of the residue in the distillation vessel, and the sensors at different distances from the chain correspond to different moisture contents from high to low.

[0012] A slag discharge control device for a distillation kettle, characterized in that it includes the above-mentioned slag moisture content detection device for a distillation kettle, and further includes a control unit, wherein the control unit controls the slag discharge according to the sensing signals received from different sensors.

[0013] A method for controlling the slag discharge of a distillation vessel, characterized by being implemented based on the aforementioned slag discharge control device for the distillation vessel, includes the following steps:

[0014] When the stirring reducer of the distillation vessel is running, the position of the tensioning wheel is detected by the sensor. When the tensioning wheel is detected to be directly above the sensor corresponding to the moisture content of the slag being discharged, the distillation vessel is controlled to discharge the slag.

[0015] Furthermore, when the sensor signal from the sensor furthest from the chain is triggered and then disappears, and no other sensors are triggered, the distillation vessel stops and an alarm is triggered.

[0016] Furthermore, control the slag discharge from the distillation vessel, specifically as follows:

[0017] Depressurize the distillation vessel. When the pressure inside the distillation vessel rises to the level required for slag discharge, open the slag discharge hole. Control the stirring reducer to reverse and discharge the slag within the set slag discharge time. After the slag discharge time is reached, clean the discharge port.

[0018] Furthermore, control the slag discharge from the distillation vessel, specifically as follows:

[0019] Close the vacuum isolation valve and stop the vacuum pump; open the vacuum breaking valve to release pressure. When the pressure inside the distillation vessel rises to -5 kPa, start the slag discharge cylinder to connect the inner cavity of the distillation vessel with the slag discharge port. Control the stirring reducer to reverse and discharge slag within the set slag discharge time. After the slag discharge time is reached, open the rotary cylinder solenoid valve to start the rotary cylinder to close the slag discharge port, open the slag discharge port cleaning valve to introduce steam to clean the discharge port, and close the slag discharge port cleaning valve and the rotary cylinder solenoid valve after cleaning is completed. The rotary cylinder is then reset.

[0020] Furthermore, the mixing reducer is set to operate at different frequencies before, during, and after the slag discharge time, and the operating frequency of the mixing reducer is gradually increased before, during, and after the slag discharge time.

[0021] This invention indirectly reflects the moisture content of the residue by detecting changes in the chain tension of the distillation vessel's stirring system and observing changes in the position of the chain tensioner, eliminating the need for a moisture content sensor inside the vessel. When the moisture content of the residue in the distillation vessel is high, the liquid component accounts for a large proportion of the residue, and solid particles are dispersed in the liquid, resulting in low resistance to the stirring shaft. As the distillation process proceeds, the moisture content gradually decreases, the liquid component diminishes, and the waste liquid gradually concentrates, transitioning from a fluid state to a semi-solid or solid state. This significantly increases the stirring resistance to the stirring shaft. The stirring shaft is connected to the stirring reducer via a chain, and the tensioner continuously applies pressure to maintain chain tension through its self-adjusting mechanism. When the stirring resistance increases, the tension on the chain increases accordingly, causing the chain to tighten. This tightening of the chain pushes against the tensioner, compressing its self-adjusting mechanism. This causes the tensioning wheel to shift, and multiple sensors are spaced along the movement path of the tensioning wheel. The sensors at different positions correspond to the chain tension at specific moisture contents. By utilizing the transmission characteristics of the stirring system itself, a correspondence between moisture content and tensioning wheel position is established. Therefore, it is not necessary to directly detect the moisture content. The moisture content can be indirectly monitored by sensing the sensor signal at the position of the tensioning wheel. The target moisture content can be set according to the different sensor positions to ensure that the moisture content of the residue meets the requirements when the slag is discharged, thereby reducing the industrial wastewater treatment cost for customers. This method is also more environmentally friendly, as the evaporated water can be reused or further treated to meet discharge standards.

[0022] This invention is based on the detection of dynamic resistance changes during the operation of the stirring system, which can monitor the moisture content in real time without stopping the machine, without affecting the distillation process and improving production efficiency. This invention automatically feeds back the moisture content changes through mechanical transmission characteristics, which reduces the dependence on the operator's experience and can improve the automation level and stability of slag discharge control. Furthermore, this invention utilizes the chain drive mechanism of the existing distillation kettle stirring system, which eliminates the need for complex modifications to the distillation kettle body, reducing equipment modification costs and installation difficulty. Attached Figure Description

[0023] Figure 1 This is a partial schematic diagram of a device for detecting the moisture content of residue in a distillation vessel, as described in the embodiment.

[0024] Figure 2 This is a side view of a device for detecting the moisture content of residue in a distillation vessel, as described in the embodiment.

[0025] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0026] Figure 4 This is a schematic diagram of the slag discharge components of the distillation vessel in the embodiment. Detailed Implementation

[0027] See Figure 1 , Figure 2 , Figure 3 A device for detecting the moisture content of residue in a distillation vessel is disclosed. The distillation vessel 100 is equipped with a stirring shaft 101, and a stirring rod, a stirring scraper, and other stirrers are connected to the stirring shaft. The device also includes a stirring reducer 102, which is driven by a chain 103. A chain tensioner 104 is provided on one side of the chain 103. The chain tensioner 104 tensions the chain 103 through a tensioning wheel 105. Several sensors 106 are arranged at intervals along the movable direction of the tensioning wheel 105. As the moisture content of the residue in the distillation vessel 100 decreases and the stirring resistance increases, the chain 103 gradually tightens, thereby straightening and pushing the tensioning wheel 105 so that the tensioning wheel 105 passes through the sensors 106 one by one. The sensors 106 can sense the sensing signal emitted by the tensioning wheel 105. The sensors 106 at different positions correspond to different moisture contents of the residue in the distillation vessel 100.

[0028] In one embodiment of the present invention, a driven sprocket 107 is mounted on the stirring shaft 101, and a driving sprocket 108 is mounted on the output shaft of the reducer. The driving sprocket 108 and the driven sprocket 107 are connected by a chain 103.

[0029] When the moisture content of the residue in the distillation vessel 100 is high, the liquid component accounts for a large proportion of the residue, and the solid particles are dispersed in the liquid, resulting in low resistance to the stirring shaft 101. As the distillation process proceeds, the moisture content gradually decreases, the liquid component decreases, and the waste liquid gradually concentrates. The waste liquid will change from a fluid state to a semi-solid or solid state, and the stirring resistance to the stirring shaft 101 will increase significantly. The stirring shaft 101 is connected to the stirring reducer 102 via the chain 103, and the tensioning wheel 105 continuously applies pressure through the elasticity of the self-adjusting mechanism of the chain tensioner 104 to maintain the chain tension. When the stirring resistance increases, the tension on the chain 103 increases accordingly, causing the chain 103 to tighten. This tightening pushes the tension wheel 105, compressing its self-adjusting mechanism and causing it to shift. Multiple sensors 106 are spaced along the movement path of the tension wheel 105. Each sensor 106 at a different position corresponds to the chain tension at a specific moisture content. Customers can pre-measure the relationship between moisture content and tension wheel position according to their needs and set the tension wheel position. During subsequent distillation, the transmission characteristics of the distillation vessel's stirring system establish the relationship between moisture content and tension wheel position, eliminating the need for further moisture content detection. Moisture content can be indirectly monitored through the sensor signals from the tension wheel position sensors. This allows for setting target moisture content based on different sensor positions, ensuring the residue moisture content meets requirements during slag discharge and reducing industrial wastewater treatment costs for customers.

[0030] Existing technologies rely on time settings or the use of moisture content sensors. This invention proposes to indirectly detect the moisture content of residue by changing the chain tension of the distillation kettle's stirring system. It transforms the time-based control method into a correlation control between actual stirring resistance and moisture content. This eliminates the need to install sensors inside the distillation kettle or in corrosive media; external sensors are only placed on the movement path of the chain tensioner. This avoids direct contact between the sensors and harsh environments, significantly improving the reliability and lifespan of the detection system. Furthermore, it allows for real-time monitoring during distillation without interrupting production or affecting processing progress. In addition, the embodiments mainly utilize the existing stirring shaft, chain, and tensioner drive components of the distillation kettle. Only sensors need to be added on the movement path of the tensioner, without major modifications to the kettle structure. This results in low hardware costs, convenient installation, and suitability for equipment upgrades in industrial settings.

[0031] See Figure 3In one embodiment of the present invention, the sensor 106 is a distance sensor, such as a photoelectric switch. Three sensors 106 are provided and are arranged at the same height. The sensor 106 can be set with a sensing threshold. When the tension wheel 105 is pushed back to directly above the sensor 106, the distance between the lowest point of the tension wheel 105 and the sensor 106 is less than the sensing threshold, and the sensor 106 can sense the tension wheel emitting a sensing signal. At other times, the distance between the tension wheel 105 and the sensor 106 is greater than the sensing threshold. The sensing signals emitted by different sensors 106 correspond to different moisture contents of the residue in the distillation vessel. The sensors 106 that are further away from the chain 103 correspond to moisture contents from high to low.

[0032] In this embodiment, the system is configured such that when the moisture content is between 20% and 10%, the sensor 106 closest to the sprocket receives a signal, indicating that the residue is wet; when the moisture content is between 10% and 5%, the sensor 106 in the middle receives a signal, indicating that the residue is semi-dry; and when the moisture content is ≤5%, the sensor 106 furthest from the sprocket receives a signal, indicating that the residue is completely dry. However, if the tensioning wheel continues to tension past the sensor furthest from the sprocket until the sensor furthest from the sprocket no longer receives a signal, a shutdown alarm is required.

[0033] In this embodiment, multiple sensors are set on the movement path of the tensioning wheel to correspond to different moisture content thresholds, transforming the moisture content, which is difficult to measure directly, into an easily detectable mechanical displacement signal. The implicit moisture content parameter is made explicit by utilizing the existing stirring system of the distillation vessel. Different moisture content sensing signals are triggered by multiple sensors to achieve graded sensing.

[0034] In other embodiments of the present invention, other sensors may be used, such as through-beam sensors. When using through-beam sensors, a receiving end needs to be set at a fixed position on the tensioning wheel, and multiple transmitting ends need to be set accordingly. Alternatively, an analog cable displacement sensor may be used.

[0035] In one embodiment of the present invention, a slag discharge control device for a distillation kettle is also provided, including the slag moisture content detection device of the distillation kettle in the above embodiment, and a control unit, which controls the slag discharge according to the sensing signals received from different sensors.

[0036] In practice, the moisture content of the residue is determined by the correlation between the position of the tensioning wheel and the moisture content of the residue. Sensors detect the movement of the tensioning wheel to determine the moisture content of the residue. Different sensor positions correspond to different moisture contents, which can accurately detect the moisture content of the residue in the distillation vessel. This allows for the initiation of slag discharge when the appropriate moisture content is detected, effectively controlling the moisture content of the residue. This avoids problems caused by excessively high or low moisture content due to slag discharge too early or too late. It reduces industrial wastewater treatment costs and ensures stable and timely slag discharge. It also prevents excessive accumulation of residue at the bottom of the distillation vessel, which can clog the discharge port, pipes, and agitators, ensuring the normal operation of the equipment and reducing production interruptions and maintenance costs caused by equipment blockage. In this embodiment, the slag discharge time is not set based on the operator's experience. Compared with the time-based method in the prior art, the device in this embodiment can control the slag discharge according to the actual moisture content of the residue, which can improve the reliability and accuracy of slag discharge control.

[0037] In an embodiment of the present invention, a method for controlling the slag discharge of a distillation vessel is also provided, which is implemented based on the above-described slag discharge control device for a distillation vessel, and includes the following steps:

[0038] When the stirring reducer of the distillation vessel is running, the position of the tensioning wheel is detected by the sensor. When the tensioning wheel is detected to be directly above the sensor corresponding to the moisture content of the slag being discharged, the distillation vessel is controlled to discharge the slag.

[0039] In addition, in this embodiment, a mechanism is set to stop the distillation kettle and trigger an alarm when the sensing signal of the sensor furthest from the chain is triggered and then disappears, and no other sensors are triggered.

[0040] In this embodiment, the slag discharge from the distillation vessel is controlled as follows:

[0041] Depressurize the distillation vessel. When the pressure inside the distillation vessel rises to the level required for slag discharge, open the slag discharge port. Control the stirring reducer to reverse and discharge the slag within the set slag discharge time. Clean the slag discharge port after the slag discharge time is reached.

[0042] See Figure 4In one embodiment of the present invention, the entire distillation apparatus includes at least a distillation vessel G-101, a separator V-101, a condenser E-101, and a transfer tank V-102. When the distillation vessel G-101 discharges slag, a vacuum isolation valve SV9 and a vacuum breaking valve SV8 are required. The vacuum isolation valve SV9 is used to close during slag discharge, cutting off the connection with the vacuum pump P-101. The vacuum breaking valve SV8 is used to release pressure, raising the pressure inside the distillation vessel to the level required for slag discharge. When the pressure inside the distillation vessel reaches the slag discharge requirement, the slag discharge cylinder CG is used to open the slag discharge port 110, allowing the inner cavity of the distillation vessel to connect with the discharge port. The slag outlet 110 is connected, allowing the residue to be discharged from the distillation kettle. After slag discharge, the rotary cylinder solenoid valve SV20 activates the rotary cylinder, which then closes the slag outlet 110. This, in conjunction with the slag outlet cleaning valve SV12, cleans the slag outlet 110. Normally, the rotary cylinder keeps the slag outlet 110 open, relying primarily on the slag outlet cylinder CG to seal the connection with the inner cavity of the distillation kettle. Activating the rotary cylinder solenoid valve causes the rotary cylinder to close the slag outlet 110. The rotary cylinder at the slag outlet is designed to prevent the condensate from the rinsing steam during cleaning of the slag outlet 110 from flowing into the residue container, thus preventing further dilution of the already dried concentrate. In this embodiment, the distillation kettle is controlled to discharge slag as follows:

[0043] Close the vacuum isolation valve SV9 and stop the vacuum pump P-101; open the vacuum rupture valve SV8 to release pressure. When the pressure inside the distillation vessel rises to -5 kPa, start the slag discharge cylinder CG to open the slag discharge port 110. Control the stirring reducer 100 to reverse and discharge slag within the set slag discharge time. Set the stirring reducer 100 to run at different frequencies before, during, and after the slag discharge time. Gradually increase the operating frequency of the stirring reducer 100 in the first, second, and third stages of the slag discharge time. In this embodiment, the operating frequency of the stirring reducer is set... The system operates at frequencies of 30Hz, 40Hz, and 50Hz before, during, and after the slag discharge time, with a duration ratio of 4:3:3. After the slag discharge time is reached, the rotary cylinder solenoid valve SV20 is opened to start the rotary cylinder. The rotary cylinder closes the slag discharge port to cut off the connection with the inner cavity of the distillation vessel. The slag discharge port cleaning valve SV12 is opened to introduce steam to clean the slag discharge port 110. After cleaning, the slag discharge port cleaning valve SV12 and the rotary cylinder solenoid valve SV20 are closed, and the rotary cylinder is reset to open the slag discharge port.

[0044] In the slag discharge stage of this embodiment, the distillation kettle is first depressurized in an orderly manner. When the pressure rises to -5 kPa, the slag discharge cylinder is activated to open the slag discharge port, avoiding damage to the equipment due to sudden pressure changes. The stirring reducer is controlled to reverse at different frequencies in the early, middle, and late stages of the slag discharge time. The early stage operates at a low frequency to gently push the residue, which can avoid the residue from clogging the pipe due to excessive impact. The middle stage operates at a medium frequency to balance the slag discharge efficiency. The late stage operates at a high frequency to enhance the slag discharge power and ensure thorough slag discharge, thereby improving the slag discharge efficiency. After the slag discharge is completed, steam is introduced to clean the slag discharge port, effectively removing any residual residue to prevent the residue from drying and affecting the next slag discharge, thus extending the service life of the equipment.

[0045] After the residue is discharged, it can be properly disposed of in accordance with relevant environmental protection regulations, such as through safe landfill or solidification, to ensure that it does not cause harm to the environment. The method described in this embodiment can treat various types of industrial wastewater, achieving both wastewater reduction and resource utilization through the recovery of valuable components, thus effectively reducing the environmental harm caused by industrial wastewater.

[0046] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

[0047] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A device for detecting the moisture content of residue in a distillation vessel, the distillation vessel being equipped with a stirring shaft and further comprising a stirring reducer, wherein the stirring reducer and the stirring shaft are connected by a chain drive, and a chain tensioner is provided on one side of the chain, the chain tensioner tensioning the chain via a tensioning wheel, characterized in that: Several sensors are spaced apart along the movable direction of the tensioning wheel. As the moisture content of the residue in the distillation vessel decreases and the stirring resistance increases, the chain gradually straightens and pushes the tensioning wheel back, causing the tensioning wheel to pass through the sensors one by one. The sensors can sense the tensioning wheel and emit a sensing signal. The sensors at different positions correspond to different moisture contents of the residue in the distillation vessel.

2. The device for detecting the moisture content of residue in a distillation vessel according to claim 1, characterized in that: The sensors are set at the same height.

3. The device for detecting the moisture content of residue in a distillation vessel according to claim 1, characterized in that: When the tension wheel is pushed back to directly above the sensor, the distance between the lowest point of the tension wheel and the sensor is less than the sensing threshold, and the sensor can detect the sensing signal emitted by the tension wheel.

4. The device for detecting the moisture content of residue in a distillation vessel according to claim 1, characterized in that: A driven sprocket is mounted on the stirring shaft, and a driving sprocket is mounted on the output shaft of the reducer. The driving sprocket and the driven sprocket are connected by a chain.

5. The device for detecting the moisture content of residue in a distillation vessel according to claim 1, characterized in that: Different sensors emit signals corresponding to different moisture contents of the residue in the distillation vessel, and sensors from near to far from the chain correspond to moisture contents from high to low.

6. A slag discharge control device for a distillation kettle, characterized in that: The device for detecting the moisture content of residue in a distillation vessel as described in claim 1 further includes a control unit, which controls the discharge of residue based on the received sensing signals from different sensors.

7. A method for controlling slag discharge from a distillation vessel, characterized in that, The slag discharge control device based on the distillation kettle according to claim 6 is implemented by including the following steps: When the stirring reducer of the distillation vessel is running, the position of the tensioning wheel is detected by the sensor. When the tensioning wheel is detected to be directly above the sensor corresponding to the moisture content of the slag being discharged, the distillation vessel is controlled to discharge the slag.

8. The method for controlling slag discharge from a distillation vessel according to claim 7, characterized in that: When the sensor signal from the sensor furthest from the chain is triggered and then disappears, and no other sensors are triggered, the distillation vessel stops and an alarm sounds.

9. The method for controlling slag discharge from a distillation vessel according to claim 7, characterized in that: To control the slag discharge from the distillation vessel, the following steps are performed: Depressurize the distillation vessel. When the pressure inside the distillation vessel rises to meet the slag discharge requirements, open the slag discharge port. Control the stirring reducer to reverse and discharge the slag within the set slag discharge time. After the slag discharge time is reached, clean the discharge port.

10. The method for controlling slag discharge from a distillation vessel according to claim 9, characterized in that: To control the slag discharge from the distillation vessel, the following steps are performed: Close the vacuum isolation valve and stop the vacuum pump; open the vacuum breaking valve to release pressure. When the pressure inside the distillation vessel rises to -5 kPa, start the rotary cylinder to connect the inner cavity of the distillation vessel with the slag discharge port. Control the stirring reducer to reverse and discharge slag within the set slag discharge time. Set the stirring reducer to run at different frequencies before, during, and after the slag discharge time, and gradually increase the running frequency of the stirring reducer in each of the three stages. After the slag discharge time is reached, open the rotary cylinder solenoid valve to start the rotary cylinder to close the slag discharge port, open the slag discharge port cleaning valve to introduce steam to clean the discharge port, and close the slag discharge port cleaning valve and the rotary cylinder solenoid valve after cleaning. The rotary cylinder will then reset.

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