Deslagging control system and control method of distillation still

Abstract

The invention provides a deslagging control system and a deslagging control method of a distillation kettle, which can start deslagging at a proper time, ensure stable and timely deslagging, avoid equipment blockage caused by untimely deslagging or material loss caused by insufficient distillation caused by premature deslagging, reduce the dependence on artificial experience, reduce the labor cost and improve the production efficiency. The device can improve the convenience of production management and ensure the stability and reliability of the distillation process, and comprises a deformation amplification bracket which is fixedly connected with a stirring speed reducer of the distillation kettle and is used for amplifying the deformation generated when the stirring speed reducer drives to stir; the distance sensor is arranged on the deformation amplification bracket; the sensing block is arranged corresponding to the distance sensor; the distance sensor detects the distance between the distance sensor and the sensing block and is used for reflecting the deformation condition of the stirring speed reducer; the control unit is connected with 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 sensing block.

Description

Technical Field

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

[0002] A distillation kettle is a reaction kettle used for distillation in chemical production. Its main function is to separate different components in a mixed liquid according to the boiling point difference by heating.

[0003] The distillation kettle can effectively treat hazardous waste liquid by heating to separate the components in the hazardous waste liquid. During the treatment process, the hazardous waste liquid is heated, and the components with lower boiling points are first vaporized into gas state and then condensed and cooled to become liquid state and collected. During the distillation process, as the mixed liquid evaporates, the solid impurities and residues with high boiling points and non-volatile properties will gradually accumulate at the bottom of the distillation kettle. If not discharged in time, the non-volatile solid impurities and residues will gradually accumulate at the bottom of the distillation kettle. If these residues are not discharged in time, they will block components such as the discharge port, pipeline, and agitator, affecting the normal operation of the equipment; they will also occupy the effective space and reduce the material processing capacity.

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

[0005] However, in actual production, the concentration of the original liquid often fluctuates, and the set time is a fixed value determined based on experience, which may enter the slag discharge mode too early or too late, resulting in too high or too low moisture content of the discharged slag, affecting the distillation effect or causing energy waste and reduction of production efficiency. Moreover, the setting of the time highly depends on the experience of the operator. Even for an experienced operator, it is difficult to ensure that the time set each time can accurately adapt to various production conditions. The uncertainty of the time setting or untimely slag discharge leads to equipment blockage, or premature slag discharge leads to loss of undistilled materials. In the face of various complex production situations, its reliability is poor. Summary of the Invention

[0006] In view of the above problems, the present invention provides a slag discharge control system and a control method for a distillation kettle, which can start the slag discharge at an appropriate time, ensure stable and timely slag discharge, avoid equipment blockage caused by untimely slag discharge or loss of undistilled materials caused by premature slag discharge, reduce the dependence on manual experience, lower the labor cost, improve the convenience of production management, and ensure the stability and reliability of the distillation process.

[0007] Its technical solution is as follows: A slag discharge control system for a distillation kettle includes: Deformation amplification bracket, which is fixedly connected to the stirring speed reducer of the distillation kettle and is used to amplify the deformation generated when the stirring speed reducer drives the stirring. Distance sensor, which is arranged on the deformation amplification bracket. Induction block, which 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 condition of the stirring speed reducer. Control unit, which is connected to the distance sensor. The control unit controls the distillation kettle to discharge slag according to the detected distance between the distance sensor and the induction block.

[0008] Further, one end of the deformation amplification bracket is fixedly connected to the stirring speed reducer, and the other end of the deformation amplification bracket is provided with the distance sensor.

[0009] Further, the induction block is fixed on the installation bracket. The induction block is located directly below the distance sensor. The installation bracket is fixed on the distillation kettle installation bracket. A protective plate is arranged on the installation bracket corresponding to the deformation amplification bracket, and an avoidance groove through which the deformation amplification bracket can pass is arranged on the protective plate.

[0010] A slag discharge control method for a distillation kettle includes the following steps: When the stirring speed reducer of the distillation kettle drives the stirring, the distance between the distance sensor and the induction block is detected by the distance sensor. When the detected distance measured by the distance sensor meets the slag discharge condition, the distillation kettle is controlled to discharge slag.

[0011] Further, the slag discharge condition is that when the stirring speed reducer of the distillation kettle stirs and operates for 1 minute, and the distance between the distance sensor and the induction block is continuously detected to be greater than the slag discharge distance threshold and lasts for 1S twice, it is considered that there is an excessive amount of residue in the distillation kettle and slag discharge is carried out.

[0012] Further, controlling the distillation kettle to discharge slag is specifically executed as follows: The distillation kettle is depressurized. When the pressure in the distillation kettle rises to meet the slag discharge requirement, the slag discharge hole is opened, and the stirring speed reducer is controlled to reverse for slag discharge within the set slag discharge time. After the slag discharge time arrives, the slag discharge port is cleaned.

[0013] Further, controlling the distillation kettle to discharge slag is specifically executed as follows: Close the vacuum isolation valve and stop the vacuum pump; open the vacuum breaker 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, close the slag discharge port cleaning valve and the rotary cylinder solenoid valve, and reset the rotary cylinder.

[0014] Furthermore, the stirring reducer is set to operate at different frequencies in the front, middle and rear sections of the slag discharge time.

[0015] Furthermore, the operating frequency of the stirring reducer is gradually increased before, during and after the slag discharge time.

[0016] The present invention combines a deformation amplifying 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 insufficient distillation material loss caused by premature slag discharge; the prior art highly relies 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, reduces dependence on manual experience, and the operator only needs to perform simple initial condition settings. The control unit automatically determines whether to discharge slag according to the sensor data, and performs pressure relief, slag discharge, cleaning and other operations according to the preset process, thereby 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

[0017] Figure 1 A schematic diagram of a slag discharge control system of a distillation kettle in an embodiment; Figure 2 for Figure 1 The enlarged schematic diagram of point A in the middle; Figure 3 A side view of a slag discharge control system of a distillation kettle in an embodiment; Figure 4 It is a schematic diagram of some devices involved in slag discharge of the distillation kettle in the embodiment. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments, and people familiar with this technology can 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 can be combined with each other without conflict.

[0019] As Figure 1 , Figure 2 , Figure 3 shown, a slag discharging control system of a distillation kettle according to the present invention includes: A deformation amplification bracket 1, which is fixedly connected to the stirring speed reducer 100 of the distillation kettle, and is used to amplify the deformation generated when the stirring speed reducer 100 drives the stirring shaft of the distillation kettle to stir; A distance sensor 2, which is arranged on the deformation amplification bracket 1; An induction block 3, which is arranged corresponding to the distance sensor 2. The distance sensor 2 can detect the induction block 3, and the distance sensor 2 measures the distance between the distance sensor 2 and the induction block 3, and is used to reflect the deformation condition of the stirring speed reducer; A control unit (not shown in the figure), which 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 discharging condition, the control unit controls the distillation kettle to discharge slag.

[0020] When the stirring speed reducer 100 drives the stirring shaft of the distillation kettle to stir, a tiny deformation is generated under the action of torque. Its original deformation amount is usually very tiny and difficult to directly detect. By connecting a deformation amplification bracket 1 to the stirring speed reducer 100, the original deformation of the stirring speed reducer 100 is converted into the amplified displacement of the deformation amplification bracket 1. The deformation amplification bracket 1 can amplify the deformation amount. It uses the lever principle to convert the tiny elastic deformation of the stirring speed reducer into the displacement at the end of the deformation amplification bracket 1, realizing signal amplification, which is convenient for sensor detection and system control.

[0021] The residue remaining in the distillation kettle is usually some high-boiling substances or solids that are difficult to volatilize. Since the residue is deposited at the lower part of the distillation kettle, when stirring, the stirring scraper is blocked when moving downward. As the moisture content of the residue in the distillation kettle is lower, the stirring resistance of the stirring scraper in the distillation kettle is greater, the torque borne by the speed reducer is greater, and it acts on the stirring speed reducer to make the stirring speed reducer have a slight upward deformation, which can be amplified by the deformation amplification bracket 1. Therefore, when the control unit judges when to start slag discharging, the judgment condition can be set as the distance between the distance sensor 2 and the induction block 3 being greater than a set slag discharging distance threshold. After determining the length of the deformation amplification bracket 1, by calibrating the relationship of "induction distance - deformation - moisture content", the moisture content of the residue can be indirectly reflected through distance detection, and slag discharging can be started at an appropriate time. In the embodiment, when the induction distance between the distance sensor 2 and the induction block 3 is greater than or equal to 2 mm, it is considered that the moisture content of the residue in the distillation kettle is lower than 10%, and slag discharging can be carried out at this time.

[0022] Specifically, in an embodiment of the present invention, the deformation amplification bracket 1 is made of a metal with high rigidity, such as aluminum alloy, alloy steel, etc. One end of the deformation amplification bracket 1 is fixedly connected to the stirring speed reducer 100, and welding connection can be adopted. A distance sensor 2 is installed at the other end of the deformation amplification bracket 1. Since one end of the deformation amplification bracket is connected to the stirring speed reducer, when the stirring speed reducer undergoes a slight deformation, the slight change is transmitted to the other end through the deformation amplification bracket. Because the force arm is lengthened, the displacement change at the other end will be amplified compared to the original slight deformation, forming a detectable deformation. Setting the distance sensor 2 at the other end of the deformation amplification bracket 1 can achieve a greater deformation amplification effect.

[0023] In the prior art, fixed-time slag discharge is adopted, and manual adjustment according to experience is required. Different operators or different batches of processing are likely to cause 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 state of the materials in the kettle by detecting the deformation of the stirring speed reducer, which is not affected by the concentration of the original solution. As long as the stirring resistance reaches the slag discharge condition, slag discharge is triggered, ensuring stable slag discharge quality, improving the stability of the production process, and being particularly suitable for industrial scenarios where the composition of the original solution is complex and variable. The present invention converts the slag discharge logic into a standardized automatic control process, reducing the dependence on manual experience. New operators only need simple parameter initialization to ensure the consistency of slag discharge, solving the defects of low reliability and high operation threshold in the existing slag discharge methods.

[0024] By adopting the method in the embodiment, the equipment blockage and shutdown time caused by untimely slag discharge can be reduced, the loss of undistilled materials caused by fixed-time slag discharge in the prior art can be avoided, the moisture content of the residue can be accurately controlled, and the subsequent residue treatment cost can be reduced.

[0025] In the embodiment, the induction block 3 is fixed on the mounting bracket 4. The induction block 3 is directly below the distance sensor 2. The mounting bracket 4 is fixed on the distillation kettle mounting bracket 200. A protective plate 5 is provided on the mounting bracket 4 corresponding to the deformation amplification bracket 1. An avoidance groove 6 through which the deformation amplification bracket 1 can pass is provided on the protective plate 5. While ensuring the detection accuracy, it can effectively prevent the interference of external factors on the detection device, improving the reliability and durability of the system and ensuring long-term stable operation.

[0026] 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 of the distillation kettle in the above embodiment. The method includes the following steps: When the stirring speed reducer of the distillation kettle drives 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 slag.

[0027] The slag discharge condition adopted in the embodiment is that when the stirring speed reducer of the distillation kettle detects that the distance between the distance sensor and the induction block is greater than the slag discharge distance threshold for two consecutive times within 1 minute of stirring operation and lasts for 1 s, it is considered that the residue in the distillation kettle is excessive and slag discharge is required. The slag discharge distance threshold is 2 mm in the embodiment. In other embodiments, the slag discharge threshold can also be adjusted according to the length of the deformation amplification bracket 1. In the embodiment, the dual conditions of the time interval and the duration requirement are combined to judge, which can effectively avoid the mis-slag discharge caused by accidental and short-term deformation fluctuations, greatly improve the reliability of slag discharge control, and reduce unnecessary equipment operation interruption and material waste.

[0028] In the embodiment, the control of the distillation kettle for slag discharge is specifically carried out as follows: The distillation kettle is depressurized. When the pressure rise in the distillation kettle meets the slag discharge requirement, the slag discharge hole is opened, and the stirring speed reducer is controlled to reverse for slag discharge within the set slag discharge time. After the slag discharge time arrives, the slag discharge port is cleaned.

[0029] See Figure 4 , in an embodiment of the present invention, the entire distillation kettle device at least includes 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 discharges slag, the vacuum isolation valve SV9 and the vacuum breaking valve SV8 need to cooperate. The vacuum isolation valve SV9 is used to close during slag discharge to cut off the connection with the vacuum pump P-101; the vacuum breaking valve SV8 is used to relieve pressure to increase the pressure in the distillation kettle to the pressure that meets the slag discharge requirement; when the pressure in the distillation kettle reaches the slag discharge requirement, the slag discharge cylinder CG is used to open the slag discharge port 7 so that the inner cavity of the distillation kettle is communicated with the slag discharge port 7, 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 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, and mainly relies on the slag discharge cylinder CG to close the connection with the inner cavity of the distillation kettle. The start 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 during the cleaning of the slag discharge port 7 from flowing into the residue bucket and causing the dried concentrated liquid to be diluted again. In the embodiment, the control of the distillation kettle for slag discharge is specifically carried out as follows: Close the vacuum isolation valve SV9 and stop the vacuum pump P-101; open the vacuum-breaking valve SV8 to relieve the pressure. When the pressure in the distillation kettle rises to -5 KPa, start the slag discharge cylinder CG to open the slag discharge port 7. Control the reverse rotation of the stirring speed reducer 100 for slag discharge within the set slag discharge time. Set the stirring speed reducer 100 to operate at different frequencies in the front, middle, and later stages of the slag discharge time. Gradually increase the operating frequency of the stirring speed reducer 100 in the front, middle, and later stages of the slag discharge time. In the embodiment, set the operating frequencies of the stirring speed reducer to 30 Hz, 40 Hz, and 50 Hz respectively in the front, middle, and later stages of the slag discharge time. The duration ratio of the front, middle, and later stages of the slag discharge time is 4:3:3. After the slag discharge time arrives, open the rotary cylinder solenoid valve SV20 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 kettle. Open the slag discharge port cleaning valve SV12 to introduce steam to clean the slag discharge port 7. After the cleaning is completed, close the slag discharge port cleaning valve SV12 and the rotary cylinder solenoid valve SV20. The rotary cylinder resets to open the slag discharge port.

[0030] In the slag discharge execution link of the embodiment, first relieve the pressure of the distillation kettle in an orderly manner. When the pressure rises to -5 KPa, start the slag discharge cylinder to open the slag discharge port to avoid damage to the equipment caused by sudden pressure changes. Control the reverse rotation of the stirring speed reducer at different frequencies in the front, middle, and later stages of the slag discharge time. Operate at a low frequency in the front stage to gently push the residue, which can avoid blockage of the pipeline caused by excessive impact force. Operate at a medium frequency in the middle stage to balance the slag discharge efficiency. Operate at a high frequency in the later stage to enhance the slag discharge power and ensure complete slag discharge, which can improve the slag discharge efficiency. After the slag discharge is completed, introduce steam 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, and can extend the service life of the equipment.

[0031] After the residue is discharged, it can be properly treated in accordance with relevant environmental protection regulations, such as safe landfill or solidification treatment, etc., to ensure that it will not cause harm to the environment. By using the method in the embodiment, various types of hazardous waste liquids can be treated. While achieving the reduction of hazardous waste liquids, it can also achieve the purpose of resource utilization by recovering valuable components, and can effectively reduce the harm of hazardous waste liquids to the environment.

[0032] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, in any regard, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended to encompass all changes falling within the meaning and scope of the equivalent elements of the claims in the present invention.

[0033] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard 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 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, wherein the distance sensor is arranged on the deformation amplification bracket; A sensing block, wherein the sensing block is arranged corresponding to the distance sensor, and the distance sensor detects the distance between the distance sensor and the sensing block 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.

2. The slag discharge control system of 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 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.

4. A method for controlling slag discharge of 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 sensor detects the 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.

5. The method for controlling slag discharge of a distillation kettle according to claim 4, characterized in that: 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, characterized in that: Control the still to discharge slag, which is performed 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 slag discharge control method of a distillation kettle according to claim 6, characterized in that: Control the still to discharge slag, which is performed as follows: Close the vacuum isolation valve and stop the vacuum pump; open the vacuum breaker 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, 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, characterized in that: The mixing reducer is set 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, characterized in that: The operating frequency of the mixing reducer is gradually increased before, during and after the slag discharge time.

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