Residue moisture content detection device of distillation still, residue discharge control device and residue discharge control method

Abstract

The invention provides a residue moisture content detection device of a distillation kettle, a residue discharge control device and a residue discharge control method, which can effectively detect the residue moisture content of the distillation kettle, facilitate starting of residue discharge when the proper moisture content is detected, and ensure stable and timely residue discharge, the distillation kettle is provided with a stirring shaft, and further comprises a stirring speed reducer, the stirring speed reducer and the stirring shaft are in transmission through a chain, a chain tensioner is arranged on one side of the chain, the chain tensioner tensions the chain through a tensioning wheel, and the device is characterized in that a plurality of sensors are arranged at intervals in the movable direction of the tensioning wheel; along with the reduction of the moisture content of the residues in the distillation kettle, the stirring resistance is increased, the chain is gradually tightened to reversely push the tensioning wheels, so that the tensioning wheels pass through the sensors one by one, the sensors can sense sensing signals sent by the tensioning wheels, and the sensors at different positions respectively correspond to different moisture contents of the residues in the distillation kettle.

Description

Technical Field

[0001] The present invention relates to the technical field of slag discharge control of a distillation kettle, and in particular to a slag moisture content detection device, a slag discharge control device and a slag discharge control method of a distillation kettle. Background Art

[0002] A still is a reactor used for distillation in industrial wastewater production. Its primary function is to separate the different components in a mixed liquid by heating them based on their boiling point differences. Using a still can effectively treat industrial wastewater. During the treatment process, the wastewater is heated, and the components with lower boiling points are first vaporized into a gaseous state. After condensation and cooling, they are collected as liquids. During the distillation process, as the mixed liquid evaporates, solid impurities and residues with high boiling points and low volatility gradually accumulate at the bottom of the still. If not removed promptly, these non-volatile solid impurities and residues will gradually accumulate at the bottom of the still. If these residues are not removed promptly, they can clog the discharge port, pipes, agitators, and other components, affecting the normal operation of the equipment. Discharging the residue when its moisture content is very high will increase the customer's industrial wastewater disposal costs.

[0003] In the prior art, a time method is usually used to control slag discharge. Specifically, after the interval time from evaporation to drainage reaches a set value, the system enters the redistillation mode. After the set redistillation time is reached, the system enters the slag discharge mode for slag discharge.

[0004] However, in actual production, the concentration of the raw liquid often fluctuates, and the set time is a fixed value determined based on experience. This can lead to premature or late entry into the slag discharge mode, resulting in excessively high or low slag moisture content. The time method used in existing technologies is highly dependent on operator experience. Even experienced operators cannot guarantee that the set time will accurately adapt to various production conditions. Uncertainty in time setting or untimely slag discharge can lead to equipment blockage, while premature slag discharge can lead to the loss of insufficiently distilled material. This makes it unreliable in the face of various complex production situations.

[0005] Furthermore, the environment inside a still is often harsh, with the potential presence of corrosive gases and liquids, which significantly impacts moisture detection sensors. Using conventional sensors can easily lead to inaccurate measurements or sensor damage. Furthermore, installing a moisture detection sensor on a still requires consideration of the still's structural and process requirements, and improper installation can affect measurement results. Sensor measurements during the distillation process are also challenging, ideally requiring the machine to be shut down for testing. This is difficult to implement in practice, hindering processing time. Summary of the Invention

[0006] In response to the above problems, the present invention provides a residue moisture content detection device, a slag discharge control device and a slag discharge control method for a distillation kettle, which can effectively detect the residue moisture content of the distillation kettle, facilitate the start of slag discharge when a suitable moisture content is detected, and ensure stable and timely slag discharge.

[0007] The technical solution is as follows: a device for detecting the moisture content of residue in a distillation kettle, the distillation kettle is provided with a stirring shaft and also includes a stirring reducer, the stirring reducer and the stirring shaft are transmitted by a chain, a chain tensioner is provided on one side of the chain, and the chain tensioner tensions the chain through a tensioning wheel. It is characterized in that a plurality of sensors are arranged at intervals along the movable direction of the tensioning wheel, as the moisture content of the residue in the distillation kettle decreases and the stirring resistance increases, the chain gradually straightens and pushes back the tensioning wheel so that the tensioning wheel passes through the sensors one by one, the sensors can sense the induction signal emitted by the tensioning wheel, and the sensors at different positions correspond to different moisture contents of the residue in the distillation kettle.

[0008] Furthermore, the sensors are arranged at the same height.

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

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

[0011] Furthermore, the sensing signals emitted by different sensors correspond to different moisture contents of the residue in the distillation kettle, and the sensors farther from the chain correspond to moisture contents from high to low.

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

[0013] A method for controlling slag discharge of a distillation kettle is characterized by being implemented based on the above-mentioned slag discharge control device of the distillation kettle and comprising the following steps:

[0014] When the stirring reducer of the distillation kettle is in stirring operation, the position of the tension wheel is detected by the sensor. When it is detected that the tension wheel moves to the top of the sensor corresponding to the moisture content of the slag discharge, the distillation kettle is controlled to discharge the slag.

[0015] Furthermore, when the induction signal of the sensor farthest from the chain is triggered and then disappears, and no other sensors are triggered, the distillation kettle stops and an alarm is sounded.

[0016] Furthermore, the distillation kettle is controlled to discharge slag, which is specifically performed as follows:

[0017] The distillation kettle is depressurized. When the pressure inside the distillation kettle rises to meet the slag discharge requirements, the slag discharge hole is opened. The stirring reducer is controlled to reverse and discharge the slag within the set slag discharge time. After the slag discharge time is reached, the discharge port is cleaned.

[0018] Furthermore, the distillation kettle is controlled to discharge slag, which is specifically performed as follows:

[0019] Close the vacuum isolation valve and stop the vacuum pump; open the vacuum breaker valve to release the pressure. When the pressure in the distillation kettle rises to -5KPa, start the slag discharge cylinder to connect the inner cavity of the distillation kettle with 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, 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. After cleaning is completed, close the slag discharge port cleaning valve and the rotary cylinder solenoid valve, and reset the rotary cylinder.

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

[0021] The present invention detects the chain tensioning force changes of the stirring system of the distillation kettle and indirectly reflects the moisture content of the residue through the position change of the chain tensioner, without the need to install a moisture sensor in the kettle. When the moisture content of the residue in the distillation kettle is high, the liquid component accounts for a large proportion of the residue, and the solid particles are dispersed in the liquid, which has little resistance to the stirring shaft. 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 will increase significantly. The stirring shaft is connected to the stirring reducer through a chain, and the tensioner continuously applies pressure through the self-adjusting mechanism of the chain tensioner to keep the chain in a tensioned state. When the stirring resistance increases, the tension on the chain increases accordingly, and the chain will be tightened. As the chain tightens, it will push back on the tensioner, compressing the self-adjusting mechanism of the tensioner. The tensioning wheel is displaced, and multiple sensors are installed at intervals along the movement path of the tensioning wheel. Sensors at different positions correspond to chain tensions under specific moisture contents. The transmission characteristics of the mixing system itself are used to establish a corresponding relationship between moisture content and tensioning wheel position. Therefore, there is no need to directly detect the moisture content. The moisture content can be indirectly monitored by sensing signals from sensors that sense the position of the tensioning wheel. Therefore, the target moisture content can be set according to different sensor positions to ensure that the moisture content of the residue meets the requirements during slag discharge, reducing the customer's industrial wastewater disposal costs. This method is more beneficial to the environment, and the evaporated water can be reused or reprocessed to meet discharge standards.

[0022] The present invention is based on the detection of dynamic resistance changes during the operation of the stirring system, and can monitor the moisture content in real time without stopping the system, without affecting the progress of the distillation process, and can improve production efficiency; the present invention automatically feeds back moisture content changes through mechanical transmission characteristics, relies less on the operator's experience, and can improve the automation level and stability of slag discharge control; and the present invention utilizes the chain transmission mechanism of the stirring system of the existing distillation kettle, without the need for complex modification of the distillation kettle body, reducing the equipment modification cost and installation difficulty. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A partial schematic diagram of a device for detecting moisture content of residue in a distillation kettle in an embodiment;

[0024] Figure 2 A side view of a device for detecting moisture content of residue in a distillation kettle according to an embodiment;

[0025] Figure 3 for Figure 2 A magnified schematic diagram of point A in the middle;

[0026] Figure 4 Schematic diagram of some components involved in slag discharge of the distillation kettle in the embodiment. DETAILED DESCRIPTION

[0027] See Figure 1 、 Figure 2 、 Figure 3 , a device for detecting the moisture content of residue in a distillation kettle, wherein a stirring shaft 101 is provided in the distillation kettle 100, and a stirring rod, a stirring scraper and other agitators are connected to the stirring shaft, and the device also includes a stirring reducer 102, a chain 103 is used to transmit the power between the stirring reducer 102 and the stirring shaft 101, a chain tensioner 104 is provided on one side of the chain 103, and the chain tensioner 104 tensions the chain 103 through a tensioning wheel 105, and a plurality of 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 kettle 100 decreases, the stirring resistance increases, the chain 103 is gradually tightened, and then straightened and pushed back the tensioning wheel 105 so that the tensioning wheel 105 passes through the sensor 106 one by one, and the sensor 106 can sense the sensing signal sent by the tensioning wheel 105, and the sensors 106 at different positions correspond to different moisture contents of the residue in the distillation kettle 100.

[0028] In one embodiment of the present invention, a driven sprocket 107 is installed on the stirring shaft 101 , a driving sprocket 108 is installed on the output shaft of the speed reducer, and 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 kettle 100 is high, the liquid component accounts for a large proportion of the residue, and the solid particles are dispersed in the liquid, which has little 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 through a chain 103, and the tensioning wheel 105 continuously applies pressure through the elastic force of the self-adjusting mechanism of the chain tensioner 104 to keep the chain in a tensioned state. When the stirring resistance increases, the tension on the chain 103 increases accordingly, and the chain 103 will be tightened. As the chain 103 tightens, it will push back the tensioning wheel 105, and the tensioning wheel 105 compresses the self-adjusting mechanism of the tensioning wheel, causing the tensioning wheel 105 to move. Multiple sensors 106 are set at intervals along the moving path of the tensioning wheel 105. The sensors 106 at different positions correspond to the chain tension under specific moisture content. Customers can pre-measure the correspondence between the moisture content and the tensioning wheel position according to their actual needs and set the tensioning wheel position. During subsequent distillation, the transmission characteristics of the stirring system of the distillation kettle are used to establish the correspondence between the moisture content and the tensioning wheel position. There is no need to detect the moisture content again. The moisture content can be indirectly monitored by the sensing signal of the sensor that senses the tensioning wheel position. Therefore, the target moisture content can be set according to different sensor positions to ensure that the moisture content of the residue meets the requirements during slag discharge, thereby reducing the customer's industrial wastewater disposal costs.

[0030] The existing technology relies on time setting or the use of moisture content sensors. The present invention proposes to indirectly detect the moisture content of the residue through the change of the chain tensioning force of the distillation kettle stirring system, and converts the time control of the time method into the correlation control of the actual stirring resistance and moisture content. There is no need to install sensors inside the distillation kettle or in the corrosive medium. Only an external sensor is set on the moving path of the chain tensioner, which can avoid direct contact between the sensor and the harsh environment, and can significantly improve the reliability and life of the detection system. It can also monitor in real time during the distillation process without interrupting production and affecting the processing progress. In addition, the embodiment mainly utilizes the existing stirring shaft, chain, and tensioner transmission components of the distillation kettle. It is only necessary to install a sensor on the moving path of the tensioner, and there is no need to make major modifications to the kettle body structure. The hardware cost is low and the installation is convenient, which is suitable for equipment upgrades in industrial sites.

[0031] See Figure 3In one embodiment of the present invention, the sensor 106 adopts a distance sensor, such as a photoelectric switch. Three sensors 106 are provided, and the sensors 106 are arranged at the same height. The sensor 106 can set a sensing threshold. When the tensioning wheel 105 is pushed back to the top of the sensor 106, the distance between the lowest point of the tensioning wheel 105 and the sensor 106 is less than the sensing threshold, and the sensor 106 can sense the tensioning wheel and send a sensing signal. At other times, the distance between the tensioning wheel 105 and the sensor 106 is greater than the sensing threshold. The sensing signals sent by different sensors 106 correspond to different moisture contents of the residue in the distillation kettle. The sensors 106 farther and farther from the chain 103 correspond to moisture contents from high to low.

[0032] In this embodiment, 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 middle sensor 106 receives a signal, indicating that the residue is semi-dry; and when the moisture content is ≤5%, the sensor 106 farthest from the sprocket receives a signal, indicating that the residue is completely dry. However, if the tensioning wheel continues to tighten past the sensor farthest from the sprocket, and tensioning reaches the point where the sensor farthest from the sprocket loses a signal, a shutdown alarm is required.

[0033] In the embodiment, multiple sensors are set on the moving path of the tensioning wheel to correspond to different moisture content thresholds, so that the moisture content that is difficult to measure directly is converted into an easily detectable mechanical displacement signal. The existing stirring system of the distillation kettle is used to make the implicit moisture content parameter explicit, and the sensing signals of different moisture contents are triggered by multiple sensors to achieve graded sensing.

[0034] In other embodiments of the present invention, the sensor may adopt other sensors, such as a through-beam sensor. When a through-beam sensor is adopted, a receiving end needs to be set at a fixed position of the tensioning wheel, and multiple transmitting ends need to be set correspondingly; an analog rope displacement sensor may also be used.

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

[0036] During implementation, the position of the tensioning wheel is associated with the moisture content of the residue, and the sensor is used to sense the movement of the tensioning wheel to determine the moisture content of the residue. Sensors at different positions correspond to different moisture contents, and can accurately detect the moisture content of the residue in the distillation kettle, conveniently start slag discharge when the appropriate moisture content is detected, and effectively control the moisture content of the residue. It can avoid the problem of too high or too low moisture content caused by slag discharge too early or too late, and can reduce the cost of industrial wastewater disposal, and can ensure stable and timely slag discharge, avoid excessive accumulation of residue at the bottom of the distillation kettle and blockage of the discharge port, pipeline, agitator and other components, ensure the normal operation of the equipment, and reduce production interruptions and maintenance costs caused by equipment blockage. The embodiment does not rely on the operator's experience to set the slag discharge time. Compared with the time method in the prior art, the device in the embodiment can control 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 slag discharge of a distillation kettle is further provided, which is implemented based on the above-mentioned slag discharge control device of the distillation kettle and includes the following steps:

[0038] When the stirring reducer of the distillation kettle is in stirring operation, the position of the tension wheel is detected by the sensor. When it is detected that the tension wheel moves to the top of the sensor corresponding to the moisture content of the slag discharge, the distillation kettle is controlled to discharge the slag.

[0039] In addition, in the embodiment, it is also provided that when the induction signal of the sensor farthest from the chain is triggered and then disappears, and no other sensors are triggered, the distillation kettle is shut down and an alarm is sounded.

[0040] In the embodiment, the still is controlled to discharge slag, which is specifically performed as follows:

[0041] The distillation kettle is depressurized. When the pressure inside the distillation kettle rises to meet the slag discharge requirements, the slag discharge hole is opened. The stirring reducer is controlled to reverse to discharge the slag within the set slag discharge time. After the slag discharge time is reached, the slag discharge port is cleaned.

[0042] See Figure 4In one embodiment of the present invention, the entire distillation kettle device includes at least a distillation kettle G-101, a separator V-101, a condenser E-101, and a transfer tank V-102. When the distillation kettle G-101 is discharged, a vacuum isolation valve SV9 and a vacuum breaker valve SV8 need to cooperate. The vacuum isolation valve SV9 is used to close during the discharge and cut off the connection with the vacuum pump P-101; the vacuum breaker valve SV8 is used to release the pressure to increase the pressure in the distillation kettle to a pressure that meets the discharge requirements; when the pressure in the distillation kettle reaches the discharge requirements, the discharge cylinder CG is used to open the discharge port 110, so that the inner cavity of the distillation kettle is separated from the discharge chamber. The slag outlet 110 is connected, and the residue can be discharged from the distillation kettle. After the slag discharge is completed, the rotary cylinder solenoid valve SV20 starts the rotary cylinder, and the rotary cylinder starts to close the slag discharge outlet 110, and cooperates with the slag discharge outlet cleaning valve SV12 to realize the cleaning operation of the slag discharge outlet 110. The rotary cylinder usually opens the slag discharge outlet 110, mainly relying on the slag discharge cylinder CG to close the connection with the inner cavity of the distillation kettle. The activation of the rotary cylinder solenoid valve will cause the rotary cylinder to close the slag discharge outlet 110. The setting of the rotary cylinder at the slag discharge outlet is to prevent the steam condensate flushed when cleaning the slag discharge outlet 110 from flowing into the residue barrel, causing the dried concentrate to be diluted again. In the embodiment, the distillation kettle is controlled to discharge slag, which is specifically performed as follows:

[0043] Close the vacuum isolation valve SV9 and stop the vacuum pump P-101; open the vacuum breaker valve SV8 to release the pressure. When the pressure in the distillation kettle rises to -5KPa, 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. Increase the operating frequency of the stirring reducer 100 step by step before, during and after the slag discharge time. In the embodiment, set the operating frequency of the stirring reducer It runs at frequencies of 30Hz, 40Hz and 50Hz respectively in the front, middle and rear sections of the slag discharge time, and the time ratio of the front, middle and rear sections of the slag discharge time is 4:3:3; after the slag discharge time is arrived, the rotary cylinder solenoid valve SV20 is opened to start the rotary cylinder, the rotary cylinder closes the slag discharge port and cuts off the connection with the inner cavity of the distillation kettle, the slag discharge port cleaning valve SV12 is opened to introduce steam to clean the slag discharge port 110, and after cleaning is completed, 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 embodiment, during the slag discharge execution link, the distillation kettle is first depressurized in an orderly manner. When the pressure rises to -5KPa, the slag discharge cylinder is started to open the slag discharge port to avoid damage to the equipment due to sudden pressure changes; the stirring reducer is controlled to reverse at different frequencies in the front, middle and back sections of the slag discharge time. The front section operates at a low frequency to gently push the residue, which can avoid the residue clogging the pipeline due to excessive impact force; the middle section operates at a medium frequency to balance the slag discharge efficiency; the back section operates at a high frequency to enhance the slag discharge power, ensure that the slag discharge is thorough, and improve the slag discharge efficiency; after the slag discharge is completed, steam is introduced to clean the slag discharge port to effectively remove the residual residue at the slag discharge port to prevent the residue from drying and affecting the next slag discharge, thereby 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 by safe landfill or solidification treatment, to ensure that it does not cause harm to the environment. The method of the embodiment can treat various types of industrial wastewater, and while achieving industrial wastewater reduction, it can also achieve the purpose of resource utilization by recovering valuable components, which can effectively reduce the harm of industrial wastewater to the environment.

[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 embodied 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 illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced therein.

[0047] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A device for detecting the moisture content of residue in a distillation kettle, wherein the distillation kettle is provided with a stirring shaft and a stirring reducer, wherein the stirring reducer and the stirring shaft are driven by a chain, a chain tensioner is provided on one side of the chain, and the chain tensioner tensions the chain via a tensioning pulley, wherein: Several sensors are arranged at intervals along the movable direction of the tensioning wheel. As the moisture content of the residue in the distillation kettle decreases and the stirring resistance increases, the chain gradually straightens and pushes the tensioning wheel back so that the tensioning wheel passes through the sensors one by one. The sensors can sense the sensing signals emitted by the tensioning wheel. Sensors at different positions correspond to different moisture contents of the residue in the distillation kettle.

2. The device for detecting moisture content of residue in a distillation kettle according to claim 1, wherein: The sensors are arranged at equal heights.

3. The device for detecting moisture content of residue in a distillation kettle according to claim 1, wherein: When the tensioning wheel is pushed back to the position directly above the sensor, the distance between the lowest point of the tensioning wheel and the sensor is smaller than the sensing threshold, and the sensor can sense the sensing signal emitted by the tensioning wheel.

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

5. The device for detecting moisture content of residue in a distillation kettle according to claim 1, wherein: The sensing signals emitted by different sensors correspond to different moisture contents of the residue in the distillation kettle, and the sensors farther away 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 kettle according to claim 1 also includes a control unit, which controls slag discharge according to sensing signals received from different sensors.

7. A method for controlling slag discharge from a distillation kettle, characterized in that: The slag discharge control device of the distillation kettle according to claim 6 is implemented, comprising the following steps: When the stirring reducer of the distillation kettle is in stirring operation, the position of the tension wheel is detected by the sensor. When it is detected that the tension wheel moves to the top of the sensor corresponding to the moisture content of the slag discharge, the distillation kettle is controlled to discharge the slag.

8. The method for controlling slag discharge of a distillation kettle according to claim 7, wherein: When the induction signal of the sensor farthest from the chain is triggered and then disappears, and no other sensors are triggered, the distillation kettle stops and an alarm is sounded.

9. The method for controlling slag discharge of a distillation kettle according to claim 7, wherein: Control the still to discharge slag, which is carried out as follows: The distillation kettle is depressurized. When the pressure inside the distillation kettle rises to meet the slag discharge requirements, the slag discharge hole is opened. The stirring reducer is controlled to reverse and discharge the slag within the set slag discharge time. After the slag discharge time is reached, the discharge port is cleaned.

10. The method for controlling slag discharge of a distillation kettle according to claim 9, wherein: Control the still to discharge slag, which is carried out as follows: Close the vacuum isolation valve and stop the vacuum pump; open the vacuum breaker valve to release the pressure. When the pressure in the distillation kettle rises to -5KPa, start the slag discharge cylinder to connect the inner cavity of the distillation kettle with the slag discharge port. Control the stirring reducer to reverse and discharge the slag within the set slag discharge time. Set the stirring reducer to run at different frequencies before, during and after the slag discharge time. Increase the operating frequency of the stirring reducer step by step before, during and after the slag discharge time. After the slag discharge time is arrived, 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. After cleaning is completed, close the slag discharge port cleaning valve and the rotary cylinder solenoid valve, and reset the rotary cylinder.

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