A slag discharge control system and control method for a distillation kettle

Abstract

The present invention provides a slag discharge control system and control method for a distillation kettle, which can start slag discharge at an appropriate time, ensure stable and timely slag discharge, avoid equipment blockage caused by untimely slag discharge or loss of insufficiently distilled materials caused by premature slag discharge, and at the same time reduce dependence on manual experience and reduce labor costs, thereby improving the convenience of production management and ensuring the stability and reliability of the distillation process. The control system and control method include: a deformation amplification bracket is fixedly connected to the stirring reducer of the distillation kettle, and is used to amplify the deformation generated when the stirring reducer drives stirring; a distance sensor is arranged on the deformation amplification bracket; an induction block is arranged corresponding to the distance sensor; the distance sensor detects the distance between the distance sensor and the induction block, and is used to reflect the deformation of the stirring reducer; a control unit is connected to the distance sensor, and the control unit controls the distillation kettle to discharge slag according to the detected distance between the distance sensor and the induction block.

Description

Technical Field

[0001] The present invention relates to the technical field of distillation equipment, and in particular to a slag discharge control system and a control method for a distillation kettle. Background Art

[0002] A still is a reactor used for distillation in chemical production. Its main function is to separate different components in a mixed liquid based on differences in boiling points by heating.

[0003] Using a distillation kettle effectively treats hazardous waste liquids, separating their components through heating. During the treatment process, the hazardous waste liquid is heated, and 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, non-volatile solid impurities and residues with higher boiling points gradually accumulate at the bottom of the distillation kettle. If not promptly removed, these non-volatile solid impurities and residues can clog the discharge port, piping, agitator, and other components, affecting normal equipment operation. They can also occupy available space and reduce material throughput.

[0004] In the prior art, the time method is usually used to control slag discharge. The time method sets a fixed slag discharge time based on experience. When the set slag discharge time is reached, the system performs the slag discharge operation to avoid excessive residue affecting the distillation effect or causing equipment failure.

[0005] However, in actual production, the concentration of the raw liquid often fluctuates, and the set time is a fixed value determined based on experience. It may enter the slag discharge mode too early or too late, resulting in the slag water content being too high or too low, affecting the distillation effect or causing energy waste and reduced production efficiency. Moreover, the time setting is highly dependent on the operator's experience. Even experienced operators cannot guarantee that the time set each time can accurately adapt to various production conditions. The uncertainty of the time setting or untimely slag discharge may lead to equipment blockage, or premature slag discharge may lead to loss of insufficiently distilled materials. Its reliability is poor when faced with various complex production situations. Summary of the Invention

[0006] In response to the above problems, the present invention provides a slag discharge control system and control method for a distillation kettle, which can start slag discharge at an appropriate time to ensure stable and timely slag discharge, avoid equipment blockage due to untimely slag discharge or loss of insufficiently distilled materials due to premature slag discharge, and at the same time reduce dependence on manual experience and reduce labor costs, thereby improving the convenience of production management and ensuring the stability and reliability of the distillation process.

[0007] The technical solution is as follows: a slag discharge control system for a distillation kettle, comprising:

[0008] A deformation amplifying bracket, which is fixedly connected to the stirring reducer of the distillation kettle and is used to amplify the deformation generated when the stirring reducer drives the stirring;

[0009] a distance sensor, the distance sensor being arranged on the deformation amplifying bracket;

[0010] A sensing block, the sensing block being arranged corresponding to the distance sensor, the distance sensor detecting the distance between the distance sensor and the sensing block, and being used to reflect the deformation of the stirring reducer;

[0011] A control unit is connected to the distance sensor, and the control unit controls the distillation kettle to discharge slag according to the detected distance between the distance sensor and the induction block.

[0012] Furthermore, one end of the deformation amplifying bracket is fixedly connected to the stirring reducer, and the other end of the deformation amplifying bracket is installed with the distance sensor.

[0013] Furthermore, the sensing block is fixed on a mounting bracket, the sensing block is located directly below the distance sensor, the mounting bracket is fixed on a distillation kettle mounting bracket, a protective plate is provided on the mounting bracket corresponding to the deformation amplification bracket, and an avoidance groove is provided on the protective plate for the deformation amplification bracket to pass through.

[0014] A method for controlling slag discharge of a distillation kettle comprises the following steps:

[0015] When the stirring reducer of the distillation kettle is driving the stirring, the distance between the distance sensor and the induction block is detected by the distance sensor. When it is detected that the distance measured by the distance sensor meets the slag discharge condition, the distillation kettle is controlled to discharge the slag.

[0016] Furthermore, the slag discharge condition is that when the stirring reducer of the distillation kettle detects that the distance between the distance sensor and the sensing block is greater than the slag discharge distance threshold for two consecutive times within 1 minute of stirring operation and lasts for 1 second, it is considered that the residue in the distillation kettle is excessive and slag discharge is required.

[0017] Furthermore, the distillation kettle is controlled to discharge slag, which is specifically performed as follows:

[0018] 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.

[0019] Furthermore, the distillation kettle is controlled to discharge slag, which is specifically performed as follows:

[0020] 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 slag discharge port. After cleaning is completed, close the slag discharge port cleaning valve and the rotary cylinder solenoid valve, and reset the rotary cylinder.

[0021] Furthermore, the mixing reducer is set to operate at different frequencies before, during and after the slag discharge time.

[0022] Furthermore, the operating frequency of the mixing reducer is gradually increased before, during and after the slag discharge time.

[0023] The present invention combines a deformation amplification bracket with a distance sensor to convert the tiny deformation of the stirring reducer into a measurable distance change, and directly uses the actual force deformation of the stirring reducer equipment as the basis for slag discharge. It can reflect the changes in stirring resistance caused by residue accumulation in the kettle in real time, accurately capture the timing of slag discharge, and effectively avoid equipment blockage caused by untimely slag discharge or insufficiently distilled material loss caused by premature slag discharge; the existing technology relies heavily on the operator's experience to set the time, which is difficult for new employees to get started and human judgment is prone to errors. The present invention quantifies the slag discharge conditions as a clear distance threshold, reducing reliance on manual experience. The operator only needs to perform simple initial condition settings, and the control unit automatically determines whether to discharge slag based on sensor data, and performs pressure relief, slag discharge, cleaning and other operations according to the preset process, reducing the requirements on the operator's skill level, and making the slag discharge operation of the distillation kettle more standardized and automated. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of a slag discharge control system of a distillation kettle in an embodiment;

[0025] Figure 2 for Figure 1 A magnified schematic diagram of point A in the middle;

[0026] Figure 3 A side view of a slag discharge control system for a distillation kettle in an embodiment;

[0027] Figure 4 Schematic diagram of some components involved in slag discharge of the distillation kettle in the embodiment. DETAILED DESCRIPTION

[0028] In order to make the objectives, technical solutions, and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments. Those skilled in the art will understand other advantages and effects of the present invention from the contents disclosed in this specification. It should be noted that the following embodiments and features in the embodiments may be combined with each other unless there is a conflict.

[0029] like Figure 1 、 Figure 2 、 Figure 3 As shown, a slag discharge control system for a distillation kettle of the present invention comprises:

[0030] The deformation amplifying bracket 1 is fixedly connected to the stirring reducer 100 of the distillation kettle and is used to amplify the deformation generated when the stirring reducer 100 drives the stirring shaft of the distillation kettle to stir;

[0031] Distance sensor 2, the distance sensor 2 is arranged on the deformation amplification bracket 1;

[0032] The induction block 3 is set corresponding to the distance sensor 2. The distance sensor 2 can detect the induction block 3. The distance sensor 2 measures the distance between the distance sensor 2 and the induction block 3 to reflect the deformation of the mixing reducer;

[0033] The control unit (not shown in the figure) is connected to the distance sensor 2. The control unit receives the distance data measured by the distance sensor. When the distance between the distance sensor 2 and the induction block 3 measured by the distance sensor meets the slag discharge condition, the control unit controls the distillation kettle to discharge the slag.

[0034] When the stirring reducer 100 drives the stirring shaft of the distillation kettle for stirring, the tiny deformation generated under the action of torque is usually very small and difficult to detect directly. By connecting a deformation amplification bracket 1 to the stirring reducer 100, the original deformation of the stirring reducer 100 is converted into the amplified displacement of the deformation amplification bracket 1. The deformation amplification bracket 1 can amplify the deformation. It uses the lever principle to convert the tiny elastic deformation of the stirring reducer into the displacement of the end of the deformation amplification bracket 1, thereby realizing signal amplification and facilitating sensor detection and system control.

[0035] The residue remaining in the still is typically high-boiling-point substances or difficult-to-volatilize solids. Because the residue settles in the lower portion of the still, the downward movement of the stirring blade during stirring is hindered. As the moisture content of the residue decreases, the stirring resistance of the stirring blade increases, and the torque on the reducer increases. This acts on the stirring reducer, causing it to experience a slight upward deformation, which is amplified by the deformation amplification bracket 1. Therefore, when the control unit determines when to initiate slag discharge, it can set the judgment condition to be that the distance between the distance sensor 2 and the sensing block 3 is greater than a set slag discharge distance threshold. After determining the length of the deformation amplification bracket 1, by calibrating the relationship between "sensing distance-deformation-moisture content", the distance detection indirectly reflects the residue moisture content, allowing slag discharge to be initiated at the appropriate time. In one embodiment, when the sensing distance between the distance sensor 2 and the sensing block 3 is greater than or equal to 2 mm, the moisture content of the residue in the still is considered to be less than 10%, and slag discharge can then be initiated.

[0036] Specifically, in one embodiment of the present invention, the deformation amplifying bracket 1 is made of a highly rigid metal, such as aluminum alloy, alloy steel, etc. One end of the deformation amplifying bracket 1 is fixedly connected to the stirring reducer 100, which can be connected by welding. The other end of the deformation amplifying bracket 1 is mounted with a distance sensor 2. Since one end of the deformation amplifying bracket is connected to the stirring reducer, when the stirring reducer undergoes a slight deformation, the slight change is transmitted to the other end through the deformation amplifying bracket. Because the force arm is lengthened, the displacement change at the other end is amplified compared to the original slight deformation, forming a detectable deformation. Placing the distance sensor 2 at the other end of the deformation amplifying bracket 1 can achieve a greater deformation amplification effect.

[0037] The existing technology adopts a fixed time for slag discharge, which needs to be manually adjusted based on experience. Different operators or different batches of processing are prone to parameter deviations, and the slag discharge time cannot be adaptively adjusted, resulting in unstable moisture content of the residue, affecting subsequent processing. The present invention indirectly reflects the material state in the kettle by detecting the deformation of the stirring reducer, which is not affected by the concentration of the raw liquid. As long as the stirring resistance reaches the slag discharge condition, the slag discharge is triggered to ensure the stability of the slag discharge quality, which can improve the stability of the production process. It is especially suitable for industrial scenarios with complex and changeable raw liquid components. The present invention converts the slag discharge logic into a standardized automatic control process, reducing dependence on manual experience. New operators only need to initialize simple parameters to ensure slag discharge consistency, which solves the defects of low reliability and high operation threshold in existing slag discharge methods.

[0038] The method in the embodiment can reduce the equipment blockage downtime caused by untimely slag discharge, avoid the loss of insufficiently distilled materials caused by fixed-time slag discharge in the prior art, accurately control the moisture content of the residue, and reduce the subsequent residue processing costs.

[0039] In the embodiment, the sensing block 3 is fixed on the mounting bracket 4, the sensing block 3 is located directly below the distance sensor 2, the mounting bracket 4 is fixed on the distillation kettle mounting bracket 200, and a protective plate 5 is provided on the mounting bracket 4 corresponding to the deformation amplification bracket 1. The protective plate 5 is provided with an avoidance groove 6 for the deformation amplification bracket 1 to pass through. While ensuring the detection accuracy, it can effectively prevent external factors from interfering with the detection device, thereby improving the reliability and durability of the system and ensuring long-term stable operation.

[0040] In an embodiment of the present invention, a slag discharge control method for a distillation kettle is further provided, which can be implemented based on the slag discharge control system for the distillation kettle in the above embodiment. The method comprises the following steps:

[0041] When the stirring reducer of the distillation kettle is driving the stirring, the distance between the distance sensor and the induction block is detected by the distance sensor. When it is detected that the distance measured by the distance sensor meets the slag discharge condition, the distillation kettle is controlled to discharge the slag.

[0042] The slag discharge condition adopted in the embodiment is that when the stirring reducer of the distillation kettle detects that the distance between the distance sensor and the sensing block is greater than the slag discharge distance threshold for two consecutive times within 1 minute of stirring operation and lasts for 1S, it is considered that the residue in the distillation kettle is excessive and slag is discharged. The slag discharge distance threshold is 2mm in the embodiment. In other embodiments, the slag discharge threshold can also be adjusted according to the length of the deformation amplification bracket 1. The embodiment combines the dual condition judgment of time interval and duration requirements, which can effectively avoid the accidental and short-term deformation fluctuations. The reliability of slag discharge control is greatly improved, and unnecessary equipment operation interruption and material waste can be reduced.

[0043] In the embodiment, the still is controlled to discharge slag, which is specifically performed as follows:

[0044] 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.

[0045] 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 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 7, so that the distillation kettle can be discharged. The inner cavity of the still is connected to the slag discharge port 7, and the residue can be discharged from the still. 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 port 7, and cooperates with the slag discharge port cleaning valve SV12 to realize the cleaning operation of the slag discharge port 7. The rotary cylinder usually opens the slag discharge port 7, mainly relying on the slag discharge cylinder CG to close the connection with the inner cavity of the still. The activation of the rotary cylinder solenoid valve will cause the rotary cylinder to close the slag discharge port 7. The setting of the rotary cylinder at the slag discharge port is to prevent the steam condensate flushed when cleaning the slag discharge port 7 from flowing into the residue barrel, causing the dried concentrate to be diluted again. In the embodiment, the control of the still to discharge slag is specifically performed as follows:

[0046] 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 7. Control the stirring reducer 100 to reverse and discharge the 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 7, 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.

[0047] 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.

[0048] After the residue is discharged, it can be properly disposed of in accordance with relevant environmental regulations, such as by safe landfill or solidification treatment, to ensure that it does not cause harm to the environment. The method described in the embodiment can treat various types of hazardous waste liquids. While reducing the amount of hazardous waste liquid, it can also achieve resource utilization by recovering valuable components, effectively reducing the harm of hazardous waste liquids to the environment.

[0049] 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.

[0050] 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 slag discharge control system for a distillation kettle, characterized in that: include: A deformation amplifying bracket, which is fixedly connected to the stirring reducer of the distillation kettle and is used to amplify the deformation generated when the stirring reducer drives the stirring; a distance sensor, the distance sensor being arranged on the deformation amplifying bracket; A sensing block, the sensing block being arranged corresponding to the distance sensor, the distance sensor detecting the distance between the distance sensor and the sensing block, and being used to reflect the deformation of the stirring reducer; a control unit connected to a distance sensor, and configured to control the distillation kettle to discharge slag according to a detected distance between the distance sensor and the induction block; When it is detected that the distance measured by the distance sensor meets the slag discharge condition, the distillation kettle is controlled to discharge the slag. The slag discharge condition is that when the stirring reducer of the distillation kettle detects that the distance between the distance sensor and the sensing block is greater than the slag discharge distance threshold for two consecutive times within 1 minute of stirring operation and lasts for 1 second, it is considered that the residue in the distillation kettle is excessive and slag discharge is required.

2. The slag discharge control system for a distillation kettle according to claim 1, characterized in that: One end of the deformation amplifying bracket is fixedly connected to the stirring reducer, and the other end of the deformation amplifying bracket is installed with the distance sensor.

3. The slag discharge control system of a distillation kettle according to claim 2, characterized in that: The sensing block is fixed on the mounting bracket, and the sensing block is located directly below the distance sensor. The mounting bracket is fixed on the distillation kettle mounting bracket. A protective plate is provided on the mounting bracket corresponding to the deformation amplification bracket, and an avoidance groove is provided on the protective plate for the deformation amplification bracket to pass through.

4. A method for controlling slag discharge from a distillation kettle, characterized in that: The slag discharge control system of the distillation kettle according to claim 1 is implemented, comprising the following steps: When the stirring reducer of the distillation kettle is driving the stirring, the distance between the distance sensor and the induction block is detected by the distance sensor. When it is detected that the distance measured by the distance sensor meets the slag discharge condition, the distillation kettle is controlled to discharge the slag.

5. The method for controlling slag discharge of a distillation kettle according to claim 4, wherein: The slag discharge condition is that when the stirring reducer of the distillation kettle detects that the distance between the distance sensor and the sensing block is greater than the slag discharge distance threshold for two consecutive times within 1 minute of stirring operation and lasts for 1 second, it is considered that the residue in the distillation kettle is excessive and slag discharge is required.

6. The method for controlling slag discharge of a distillation kettle according to claim 4, 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 to discharge the slag within the set slag discharge time. After the slag discharge time is reached, the slag discharge port is cleaned.

7. The method for controlling slag discharge of a distillation kettle according to claim 6, 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. 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 slag discharge port. After cleaning is completed, close the slag discharge port cleaning valve and the rotary cylinder solenoid valve, and reset the rotary cylinder.

8. The method for controlling slag discharge of a distillation kettle according to claim 7, wherein: Set the mixing reducer to run at different frequencies before, during and after the slag discharge time.

9. The method for controlling slag discharge of a distillation kettle according to claim 8, wherein: Increase the operating frequency of the mixing reducer step by step before, during and after the slag discharge time.

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