Fluorine-containing waste acid recycling medicament variable-frequency dosing equipment and control method

Abstract

The invention discloses a fluorine-containing waste acid recycling agent variable-frequency dosing device and a control method, and belongs to the technical field of water treatment.The fluorine-containing waste acid recycling agent variable-frequency dosing device comprises a spiral constant feeder, a reaction kettle, a sewage monitoring device, an image monitoring device, a PLC and a data analysis management platform, and the spiral constant feeder comprises a variable-frequency motor, a spiral conveying shaft, a stock bin and a discharging port; the discharge port is connected with the reaction kettle, the image monitoring device is installed at the discharge port, the sewage monitoring device is installed in the reaction kettle, the data analysis management platform is connected with the dosing equipment and the PLC through the Internet of Things, and the PLC controls the spiral quantitative feeder to work according to a control instruction. Information such as images acquired by the image monitoring device is analyzed, the feeding condition of the spiral constant feeder can be automatically judged, whether the flowing uniformity of a medicament in the conveying process can be verified, an alarm is given in time once the medicament is abnormal, and the influence of blockage or caking on the dosing precision can be prevented.

Description

Technical Field

[0001] The invention belongs to the technical field of water treatment, and in particular relates to frequency conversion dosing equipment and a control method for recycling fluorine-containing waste acid reagents. Background Art

[0002] Fluorine-containing waste acid is a core hazardous waste in high-end manufacturing industries such as photovoltaics and semiconductors. Its fluoride ion concentration is as high as 5%-12%. Therefore, the fluorine-containing waste acid needs to be treated to meet the standards before discharge. Although the traditional lime neutralization method can achieve standard discharge (F⁻<10ppm), it produces low-purity calcium fluoride sludge (CaF2 content <65%), resulting in low resource recovery benefits per ton of fluorine-containing waste acid. Direct preparation of high-value-added fluorides (such as cryolite, fluorosilicate) or removal of impurities and recycling of hydrofluoric acid can effectively increase the resource recovery benefits of fluorine-containing waste acid. However, this reuse method requires the addition of solid reagents during treatment to ensure treatment efficiency.

[0003] Traditional dosing relies on manual operation, and the speed of the screw feeder is adjusted manually based on experience. Manual operation is not only inefficient, but also has a large lag in large-scale fluorine-containing waste acid reuse and treatment scenarios, making it difficult to meet real-time and continuous dosing needs. At the same time, manual operation is easily affected by subjective factors of operators (such as experience, fatigue, sense of responsibility, etc.), resulting in unstable dosing process and easy product deviation, which ultimately affects the treatment effect. In addition, since the composition and concentration of fluorine-containing waste acid are often volatile, this requires the dosing process to be accurately adjusted according to the real-time situation of the waste acid. The traditional dosing method lacks an effective real-time monitoring and feedback mechanism, and cannot perceive changes in the properties of the waste acid in time, making it difficult to adjust the dosing amount in time, resulting in inaccurate dosing and waste of reagents. Summary of the invention

[0004] The object of the present invention is to provide a variable frequency dosing device and a control method for recycling fluorine-containing waste acid reagents, so as to solve the problems faced in the above-mentioned background technology.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] Frequency conversion dosing equipment for recycling fluorine-containing waste acid, including spiral quantitative feeder, reactor, sewage monitoring device, image monitoring device, PLC controller and data analysis management platform;

[0007] The spiral quantitative feeder includes a variable frequency motor, a spiral conveying shaft, a silo and a discharge port, the discharge port is connected to the reactor, the image monitoring device is installed at the discharge port, the sewage monitoring device is installed in the reactor, and a stirring device is also installed in the reactor; the data analysis management platform is connected to the dosing equipment and the PLC controller through the Internet of Things, and the PLC controller is used to control the operation of the spiral quantitative feeder according to control instructions.

[0008] A control method for a fluorine-containing waste acid recycling agent frequency conversion dosing device, the control method is implemented by the fluorine-containing waste acid recycling agent frequency conversion dosing device, the control method comprises:

[0009] Step 1: inject fluorine-containing waste acid into the reactor, stop when the liquid reaches the set level, and obtain various parameter information of the waste acid through the sewage monitoring device;

[0010] Step 2: Upload the acquired parameter information to the data analysis management platform for processing and analysis, so as to determine the amount of solid medicine to be added;

[0011] Step 3: According to the required amount of solid medicine, the PLC controller controls the feeding time of the spiral quantitative feeder to perform the feeding operation;

[0012] Step 4: During the dosing process, the PLC controller controls the operation of the stirring device in the reactor. After the required amount of solid medicine is added, the fluoride ion parameters in the waste acid are continuously tested. If the parameters do not meet the standard, the dosage is continued to be added, otherwise the wastewater is discharged to the next process.

[0013] Step 5: The data analysis management platform analyzes the data information obtained by the image monitoring device to determine whether the feeding of the spiral quantitative feeder is normal.

[0014] Furthermore, the method for determining the amount of solid medicine to be added in step 2 is:

[0015] Obtaining the fluoride ion concentration in the waste acid , pH value , calcium ion concentration , interfering ion concentration And the waste acid temperature , through the formula Calculate the amount of solid medicine required ;

[0016] in, As the basic addition amount, The pH is the optimal value. is the theoretical calcium ion requirement, is the optimal temperature, , is the total number of interfering ions detected, is the concentration of the i-th interfering ion, is the weight coefficient of the i-th interfering ion, and , is the reference value of interfering ion concentration, is the pH deviation penalty coefficient, is the interfering ion influence coefficient, is the calcium ion conservation coefficient, is the temperature compensation coefficient.

[0017] Furthermore, the method for determining the feeding time of the spiral quantitative feeder in step 3 is:

[0018] By formula Get the feeding time ;

[0019] in, is the calibration factor, is the feeder pipe diameter, is the current operating frequency of the variable frequency motor, It is the bulk density of the administered agent.

[0020] Furthermore, the workflow of step 4 is as follows:

[0021] Detection of fluoride ion concentration in waste acid , to determine whether it has reached the target threshold concentration :

[0022] When the fluoride ion concentration in the waste acid is detected Reaching target threshold concentration , it indicates that the treatment has met the standard and the wastewater is discharged to the next process. If the fluoride ion concentration in the waste acid is detected Target threshold concentration not reached , then by the formula Determine the secondary dose , and continue to add medicine;

[0023] in, is the drug reaction efficiency coefficient, is the waste acid viscosity attenuation factor, is the stirring time, is the error compensation amount.

[0024] Furthermore, the method for judging whether the feeding of the spiral quantitative feeder is normal in step 5 is:

[0025] Every The image information of a material is obtained at one time, and the image is grayed, denoised, and binarized to extract the material transmission area in the image;

[0026] Divide the material transfer area into n sub-areas and obtain the grayscale value of each sub-area , and through the formula Get the average grayscale value ;

[0027] By formula Determine the feed consistency index ;

[0028] when When , it is judged that the feeding of the spiral quantitative feeder is abnormal;

[0029] At the same time, when the spiral quantitative feeder is operating normally, the coherence index of N images is continuously obtained, so as to formulate a curve function of the coherence index changing with the number of images x. ;

[0030] By formula Get the abnormal value of feeding ;

[0031] when When , it is judged that the feeding of the spiral quantitative feeder is abnormal;

[0032] in, is the threshold value for setting the coherence index. The feeding abnormality judgment threshold is set. for The maximum slope of for The minimum slope of is the slope reference value, The last image acquired.

[0033] Furthermore, the data analysis management platform is also used to monitor the operating status of the dosing equipment, and the monitoring method is:

[0034] exist During the cycle, obtain the number of abnormal feeding in each waste acid treatment batch of the dosing equipment ;

[0035] By formula Get the status value ;

[0036] when When the dosing equipment is abnormal, it is judged that the operation status is abnormal;

[0037] in, is the status judgment threshold set. for The total number of spent acid treatment batches performed during the cycle, and for, It is the number of batches in which the number of feeding anomalies is greater than the average value among all processed batches.

[0038] Beneficial effects of the present invention:

[0039] The present invention can perform comprehensive analysis according to parameters such as fluoride ion concentration, pH value, temperature, interfering ion concentration and the like in fluorine-containing waste acid to accurately obtain the amount of solid medicine to be added, and can achieve accurate delivery without manual operation, thereby reducing the waste of medicine amount; at the same time, by detecting the fluoride ion concentration in the waste acid after the medicine is delivered, it can be detected in real time whether the waste acid treatment meets the standard, and when it does not meet the standard, the analysis is performed in combination with parameters such as the medicine reaction efficiency coefficient and the stirring time, so as to continue to add the medicine amount to the waste acid, thereby ensuring the treatment effect and reducing the delivery of the medicine.

[0040] The present invention analyzes the images and other information obtained by the image monitoring device, can automatically judge the feeding situation of the spiral quantitative feeder, can verify the uniformity of the flow of the medicine during the transportation process, and alarm in time if an abnormality occurs, so as to prevent blockage or agglomeration from affecting the dosing accuracy.

[0041] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0043] Figure 1 It is a structural diagram of the dosing device of the present invention; Figure 2 It is a control flow chart of the dosing equipment in the present invention.

[0044] Description of the accompanying drawings: 1. Screw quantitative feeder; 2. Reactor; 3. Sewage monitoring device; 4. Image monitoring device; 11. Frequency conversion motor; 12. Screw conveyor shaft; 13. Silo; 14. Discharge port; 21. Stirring device. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] In one embodiment, a fluorine-containing waste acid recycling agent variable frequency dosing device is disclosed, such as Figure 1 As shown, the equipment includes a spiral quantitative feeder 1, a reactor 2, a sewage monitoring device 3, an image monitoring device 4, a PLC controller and a data analysis management platform; the spiral quantitative feeder 1 includes a variable frequency motor 11, a spiral conveying shaft 12, a silo 13 and a discharge port 14, the discharge port 14 is connected to the reactor 2, the image monitoring device 4 is installed at the discharge port 14, the image monitoring device 4 can be a high-definition camera probe, the sewage monitoring device 3 is installed in the reactor 2, the sewage monitoring device can be various monitoring devices, including but not limited to a fluoride ion concentration monitoring sensor, a temperature sensor, a pH monitor, etc., and a stirring device 21 is also installed in the reactor 2; the data analysis management platform is connected to the dosing equipment and the PLC controller through the Internet of Things. The data analysis management platform obtains various parameter information in the waste acid, analyzes it to obtain the required amount of solid medicine to be added, and then transmits it to the PLC controller. The PLC controller controls the feeding time of the spiral quantitative feeder according to the required amount of solid medicine to perform the feeding operation. At the same time, the data analysis management platform analyzes the image information obtained by the image monitoring device 4 to determine whether the spiral quantitative feeder is abnormal and the operating status of the entire dosing equipment to ensure the efficiency of the entire treatment process.

[0047] In one embodiment, a control method for a fluorine-containing waste acid recycling agent variable frequency dosing device is also disclosed, such as Figure 2 As shown, the control method includes:

[0048] Step 1: inject fluorine-containing waste acid into the reactor, stop when the liquid reaches the set level, and obtain various parameter information of the waste acid through the sewage monitoring device;

[0049] Step 2: Upload the acquired parameter information to the data analysis management platform for processing and analysis, so as to determine the amount of solid medicine to be added;

[0050] Step 3: According to the required amount of solid medicine, the PLC controller controls the feeding time of the spiral quantitative feeder to perform the feeding operation;

[0051] Step 4: During the dosing process, the PLC controller controls the operation of the stirring device in the reactor. After the required amount of solid medicine is added, the fluoride ion parameters in the waste acid are continuously tested. If the parameters do not meet the standard, the dosage is continued to be added, otherwise the wastewater is discharged to the next process.

[0052] Step 5: The data analysis management platform analyzes the data information obtained by the image monitoring device to determine whether the feeding of the spiral quantitative feeder is normal.

[0053] The above scheme provides a control method for the dosing equipment, firstly, the water inlet electric valve is opened, and the fluorine-containing waste acid to be recycled is pumped into the reactor from the production line, and the liquid level is reached and stopped, and then the various parameter information of the waste acid obtained by the sewage monitoring device is uploaded to the data analysis management platform for processing and analysis, so as to determine the amount of solid medicine to be added, and then the PLC controller controls the feeding time of the spiral quantitative feeder according to the required amount of solid medicine, so as to perform the feeding operation; during the entire dosing process, the PLC controller controls the operation of the stirring device in the reactor to evenly mix the medicine and the waste acid, and after the required amount of solid medicine is added, the fluoride ion parameters in the waste acid are continuously detected, and if they do not meet the standard, the amount of medicine is continuously added, otherwise the wastewater is discharged to the next process; finally, the data analysis management platform analyzes the data information obtained by the image monitoring device to determine whether the feeding of the spiral quantitative feeder is normal. Through this operation, the amount of solid medicine to be added can be accurately obtained by comprehensively analyzing the parameters such as fluoride ion concentration, pH value, temperature, and interfering ion concentration in the waste acid. It can achieve accurate delivery without manual operation to reduce the waste of medicine. At the same time, by detecting the fluoride ion concentration in the waste acid after the medicine is added, it can be detected in real time whether the waste acid treatment meets the standard. If it does not meet the standard, the waste acid will continue to be added with the parameters such as the medicine reaction efficiency coefficient and stirring time to ensure the treatment effect while reducing the amount of medicine. In addition, by analyzing the images and other information obtained by the image monitoring device, the feeding situation of the spiral quantitative feeder can be automatically judged, and the uniformity of the flow of the medicine during the transportation process can be verified. Once an abnormality occurs, an alarm will be issued in time to prevent blockage or agglomeration from affecting the accuracy of dosing.

[0054] The method for determining the amount of solid medicine to be added in step 2 is: obtain the fluoride ion concentration in the waste acid , pH value , calcium ion concentration , interfering ion concentration And the waste acid temperature , through the formula Calculate the amount of solid medicine required ;

[0055] in, As the basic addition amount, The pH is the optimal value. is the theoretical calcium ion requirement, is the optimal temperature, , is the total number of interfering ions detected, is the concentration of the i-th interfering ion, is the weight coefficient of the i-th interfering ion, and , is the reference value of interfering ion concentration, is the pH deviation penalty coefficient, is the interfering ion influence coefficient, is the calcium ion conservation coefficient, is the temperature compensation coefficient.

[0056] The above scheme provides a specific method for determining the amount of solid reagent to be added. Generally speaking, the amount of reagent added is related to the concentration of fluoride ions. The higher the concentration, the more reagent is needed. The amount of reagent added in the treatment process is not only related to the fluoride ion concentration but also to other parameters, such as pH value and wastewater temperature. During the treatment process, the pH value and wastewater temperature must be within an appropriate range. Too large or too small a pH value will affect the amount of reagent added. Generally, in the treatment of fluoride-containing wastewater, solid reagents contain calcium ions to promote the treatment. If there are already calcium ions in the wastewater, the amount of added calcium salt can be reduced. When calcium ions are insufficient, additional supplementation is required. At the same time, the concentration of other interfering ions that affect the treatment (such as , The more the solid dosage is, the more solid dosage is needed to ensure the treatment efficiency. , pH value , calcium ion concentration , interfering ion concentration And the waste acid temperature , through the formula Calculate the amount of solid medicine required ;in, The basic addition amount is determined based on the minimum amount of reagent required to treat the unit concentration of fluoride. The optimal pH value is the theoretical calcium ion requirement, is the optimal temperature, is the reference value of interfering ion concentration, which can be determined based on historical data and empirical data. The weight coefficient of each interfering ion Determined according to the severity of interference of each interfering ion, is the pH deviation penalty coefficient, is the interfering ion influence coefficient, is the calcium ion conservation coefficient, is the temperature compensation coefficient, which can be determined according to the experimental comparison data; from the formula, it can be known that the greater the difference between the obtained pH value and the optimal pH value, the greater the difference between the obtained temperature value and the optimal temperature, and the higher the interfering ion concentration, the more the dosage of the medicine needs to be increased, and the smaller the calcium ion concentration in the wastewater, the more the dosage of the medicine needs to be increased; in this way, the fluoride ion concentration, pH value, calcium ion concentration, interfering ion concentration and temperature value in the wastewater can be combined for comprehensive analysis to determine the final dosage of the medicine, so as to achieve accurate dosage and avoid waste of medicine.

[0057] The method for determining the feeding time of the spiral quantitative feeder in step 3 is: Get the feeding time ;

[0058] in, is the calibration factor, is the feeder pipe diameter, is the current operating frequency of the variable frequency motor, It is the bulk density of the administered agent.

[0059] The above scheme provides a method for determining the feeding time of a spiral quantitative feeder. By combining the feeder pipe diameter, the current operating frequency of the variable frequency motor, the bulk density of the reagent to be fed, the calibration coefficient, etc., the feeding time can be calculated more accurately to achieve precise feeding. The calibration coefficient Calibration is carried out through experiments, which takes into account the effects of factors such as pitch, filling efficiency, mechanical friction, etc. on feeding time, ensuring the accuracy and efficiency of chemical addition during sewage treatment.

[0060] The workflow of step 4 is: Detecting the fluoride ion concentration in the waste acid , to determine whether it has reached the target threshold concentration :

[0061] When the fluoride ion concentration in the waste acid is detected Reaching target threshold concentration , it indicates that the treatment has met the standard and the wastewater is discharged to the next process. If the fluoride ion concentration in the waste acid is detected Target threshold concentration not reached , then by the formula Determine the secondary dose , and continue to add medicine;

[0062] in, is the drug reaction efficiency coefficient, is the waste acid viscosity attenuation factor, is the stirring time, is the error compensation amount.

[0063] The above scheme provides a method for secondary addition of dosage when the fluoride-containing wastewater treatment fails to meet the standard. First, the fluoride ion concentration in the waste acid is detected. , to determine whether it has reached the target threshold concentration :When the fluoride ion concentration in the waste acid is detected Reaching target threshold concentration , it indicates that the treatment has met the standard and the wastewater is discharged to the next process. If the fluoride ion concentration in the waste acid is detected Target threshold concentration not reached , then by the formula Determine the secondary dose , and continue to add medicine; among them, is the drug reaction efficiency coefficient, is the waste acid viscosity attenuation factor, is the error compensation amount, which can be determined based on experimental comparison data. For the stirring time, this can be combined with the reagent reaction efficiency, waste acid viscosity attenuation factor, etc. for a comprehensive analysis, which can more accurately estimate the required dosage of the reagent and effectively improve the effect of fluoride-containing wastewater treatment.

[0064] The method for judging whether the feeding of the spiral quantitative feeder is normal in step 5 is: The image information of a material is obtained at one time, and the image is grayed, denoised, and binarized to extract the material transmission area in the image;

[0065] Divide the material transfer area into n sub-areas and obtain the grayscale value of each sub-area , and through the formula Get the average grayscale value ;

[0066] By formula Determine the feed consistency index ;

[0067] when When , it is judged that the feeding of the spiral quantitative feeder is abnormal;

[0068] At the same time, when the spiral quantitative feeder is operating normally, the coherence index of N images is continuously obtained, so as to formulate a curve function of the coherence index changing with the number of images x. ;

[0069] By formula Get the abnormal value of feeding ;

[0070] when When , it is judged that the feeding of the spiral quantitative feeder is abnormal;

[0071] in, is the threshold value for setting the coherence index. The feeding abnormality judgment threshold is set. for The maximum slope of for The minimum slope of is the slope reference value, which can be determined through experimental data. The last image acquired.

[0072] The above scheme provides a specific method for monitoring the feeding situation of the spiral quantitative feeder. First, The image information of a material is obtained at one time, and the image is grayed, denoised, and binarized to extract the material transmission area in the image. Then the material transmission area is divided into n sub-areas to obtain the gray value of each sub-area. , and through the formula Get the average grayscale value , and finally through the formula Determine the feed consistency index The gray value can represent the density of the material in each sub-area, and the coherence index represents the fluctuation of the material in the transmission area. Obviously, when its value is smaller, it indicates that the distribution is more uniform, indicating that the uniformity of the flow of the agent during the transportation process is better, and vice versa, it indicates that the uniformity of the flow of the agent during the transportation process is worse. Therefore, it is compared with the coherence index judgment threshold set according to experience. For comparison, when When the flow uniformity of the medicine during the conveying process is poor, it is judged that the feeding of the spiral quantitative feeder is abnormal, and an alarm is issued in time. Although the spiral quantitative feeder is monitored to operate normally, if the coherence index obtained under normal circumstances is slowly increasing or has been near the threshold, it indicates that there is a potential abnormality. Therefore, in order to more accurately understand the feeding situation of the spiral quantitative feeder, when the spiral quantitative feeder is operating normally, the coherence index of N images is continuously obtained, so as to formulate a curve function of the coherence index changing with the number of images x. , through the formula Get the abnormal value of feeding ;formula is the cumulative situation of the coherence index, and The change of the coherence index shows that when the feeding is abnormal The larger the value is, the greater the possibility of potential abnormality in the feeding of the spiral quantitative feeder. Therefore, it is compared with the feeding abnormality judgment threshold preset based on experience. For comparison, when When the spiral quantitative feeder is abnormal, it means that there is a high possibility that there is an abnormal phenomenon during feeding. In order to avoid the occurrence of subsequent abnormal phenomena, the feeding of the spiral quantitative feeder is also judged to be abnormal, and the alarm is adjusted in time to ensure the efficiency of the entire processing process. In this way, the image information obtained by the spiral quantitative feeder when conveying the medicine can be analyzed to detect the feeding abnormality or potential abnormality in the conveying process, and the uniformity of the flow of the medicine during the conveying process can be verified. Once the abnormality is reported in time, the alarm can be prevented from blocking or agglomeration affecting the dosing accuracy.

[0073] The data analysis management platform is also used to monitor the operating status of the dosing equipment. The monitoring method is: During the cycle, obtain the number of abnormal feeding in each waste acid treatment batch of the dosing equipment ;

[0074] By formula Get the status value ;

[0075] when When the dosing equipment is abnormal, it is judged that the operation status is abnormal;

[0076] in, is the status judgment threshold set. for The total number of spent acid treatment batches performed during the cycle, and for, It is the number of batches in which the number of feeding anomalies is greater than the average value among all processed batches.

[0077] The above technical solution provides a method for monitoring the operation status of the dosing equipment. First, During the cycle, obtain the number of abnormal feeding in each waste acid treatment batch of the dosing equipment Generally, the more abnormalities occur, the worse the equipment operation condition is. Therefore, the formula Get the status value ,formula It is expressed as the fluctuation of the number of abnormalities in the dosing equipment under M processing batches. The larger the value, the more unstable it is. It is expressed as the proportion of processing batches in which the number of feeding anomalies is greater than the average value among M processing batches. Obviously, the larger its value is, the greater the possibility of abnormal operation of the dosing equipment. Therefore, it is combined with the condition judgment threshold set according to experience. Compare, when In this way, the operation status of the dosing equipment can be monitored, so that timely maintenance can be carried out to ensure the integrity of the dosing equipment, thereby ensuring the continuity of the entire treatment process and the stability of the reuse efficiency.

[0078] The above contents are merely examples and explanations of the concept of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the concept of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. Frequency conversion dosing equipment for recycling fluorine-containing waste acid, characterized in that: The equipment includes a spiral quantitative feeder (1), a reaction kettle (2), a sewage monitoring device (3), an image monitoring device (4), a PLC controller, and a data analysis management platform; The screw quantitative feeder (1) comprises a variable frequency motor (11), a screw conveying shaft (12), a silo (13) and a discharge port (14); the discharge port (14) is connected to a reactor (2); the image monitoring device (4) is installed at the discharge port (14); the sewage monitoring device (3) is installed in the reactor (2); and a stirring device (21) is also installed in the reactor (2); the data analysis management platform is connected to a dosing device and a PLC controller via the Internet of Things; the PLC controller is used to control the operation of the screw quantitative feeder (1) according to control instructions.

2. A control method for frequency conversion dosing equipment for recycling fluorine-containing waste acid, characterized in that: The control method is implemented by the fluorine-containing waste acid recycling agent frequency conversion dosing equipment according to claim 1, and the control method comprises: Step 1: inject fluorine-containing waste acid into the reactor, stop when the liquid reaches the set level, and obtain various parameter information of the waste acid through the sewage monitoring device; Step 2: Upload the acquired parameter information to the data analysis management platform for processing and analysis, so as to determine the amount of solid medicine to be added; Step 3: According to the required amount of solid medicine, the PLC controller controls the feeding time of the spiral quantitative feeder to perform the feeding operation; Step 4: During the dosing process, the PLC controller controls the operation of the stirring device in the reactor. After the required amount of solid medicine is added, the fluoride ion parameters in the waste acid are continuously tested. If the parameters do not meet the standard, the dosage is continued to be added, otherwise the wastewater is discharged to the next process. Step 5: The data analysis management platform analyzes the data information obtained by the image monitoring device to determine whether the feeding of the spiral quantitative feeder is normal.

3. The control method of the fluorine-containing waste acid recycling agent frequency conversion dosing equipment according to claim 2 is characterized in that: The method for determining the amount of solid medicine to be added in step 2 is: Obtaining the fluoride ion concentration in the waste acid , pH value , calcium ion concentration , interfering ion concentration And the waste acid temperature , through the formula Calculate the amount of solid medicine required ; in, As the basic addition amount, The pH is the optimal value. is the theoretical calcium ion requirement, is the optimal temperature, , is the total number of interfering ions detected, is the concentration of the i-th interfering ion, is the weight coefficient of the i-th interfering ion, and , is the reference value of interfering ion concentration, is the pH deviation penalty coefficient, is the interfering ion influence coefficient, is the calcium ion conservation coefficient, is the temperature compensation coefficient.

4. The control method of the fluorine-containing waste acid recycling agent frequency conversion dosing equipment according to claim 3 is characterized in that: The method for determining the feeding time of the spiral quantitative feeder in step 3 is: By formula Get the feeding time ; in, is the calibration factor, is the feeder pipe diameter, is the current operating frequency of the variable frequency motor, It is the bulk density of the administered agent.

5. The control method of the fluorine-containing waste acid recycling agent frequency conversion dosing equipment according to claim 4 is characterized in that: The workflow of step 4 is as follows: Detection of fluoride ion concentration in waste acid , to determine whether it has reached the target threshold concentration : When the fluoride ion concentration in the waste acid is detected Reaching target threshold concentration , it indicates that the treatment has met the standard and the wastewater is discharged to the next process. If the fluoride ion concentration in the waste acid is detected Target threshold concentration not reached , then by the formula Determine the secondary dose , and continue to add medicine; in, is the drug reaction efficiency coefficient, is the waste acid viscosity attenuation factor, is the stirring time, is the error compensation amount.

6. The control method of the fluorine-containing waste acid recycling agent frequency conversion dosing equipment according to claim 5 is characterized in that: The method for judging whether the feeding of the spiral quantitative feeder is normal in step 5 is: Every The image information of a material is obtained at one time, and the image is grayed, denoised, and binarized to extract the material transmission area in the image; Divide the material transfer area into n sub-areas and obtain the grayscale value of each sub-area , and through the formula Get the average grayscale value ; By formula Determine the feed consistency index ; when When , it is judged that the feeding of the spiral quantitative feeder is abnormal; At the same time, when the spiral quantitative feeder is operating normally, the coherence index of N images is continuously obtained, so as to formulate a curve function of the coherence index changing with the number of images x. ; By formula Get the abnormal value of feeding ; when When , it is judged that the feeding of the spiral quantitative feeder is abnormal; in, is the threshold value for setting the coherence index. The feeding abnormality judgment threshold is set. for The maximum slope of for The minimum slope of is the slope reference value, The last image acquired.

7. The control method of the fluorine-containing waste acid recycling agent frequency conversion dosing equipment according to claim 6 is characterized in that: The data analysis management platform is also used to monitor the operating status of the dosing equipment, and the monitoring method is: exist During the cycle, obtain the number of abnormal feeding in each waste acid treatment batch of the dosing equipment ; By formula Get the status value ; when When the dosing equipment is abnormal, it is judged that the operation status is abnormal; in, is the status judgment threshold set. for The total number of spent acid treatment batches performed during the cycle, and for, It is the number of batches in which the number of feeding anomalies is greater than the average value among all processed batches.

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