CN113215646A - Intelligent control system for recycling electrolytic sodium sulfate solution - Google Patents
Intelligent control system for recycling electrolytic sodium sulfate solution Download PDFInfo
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- CN113215646A CN113215646A CN202110509434.4A CN202110509434A CN113215646A CN 113215646 A CN113215646 A CN 113215646A CN 202110509434 A CN202110509434 A CN 202110509434A CN 113215646 A CN113215646 A CN 113215646A
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- C25F7/00—Constructional parts, or assemblies thereof, of cells for electrolytic removal of material from objects; Servicing or operating
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- C25F1/00—Electrolytic cleaning, degreasing, pickling or descaling
- C25F1/02—Pickling; Descaling
- C25F1/04—Pickling; Descaling in solution
- C25F1/06—Iron or steel
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- C25F7/00—Constructional parts, or assemblies thereof, of cells for electrolytic removal of material from objects; Servicing or operating
- C25F7/02—Regeneration of process liquids
Abstract
The intelligent control system for recycling the electrolytic sodium sulfate solution comprises a preparation and addition control system and a cyclic treatment control system; the preparation and adding control system consists of a sodium bisulfite preparation subsystem, a sodium bisulfite preparation tank temperature control subsystem, a sodium hydroxide preparation tank temperature control subsystem, a sodium bisulfite adding tank level control subsystem, a sulfuric acid adding tank level control subsystem and a sodium hydroxide adding tank level control subsystem; the circulating treatment control system consists of a reduction tank control subsystem, a control tank control subsystem, a circulating tank control subsystem, a sludge disposal control subsystem, a final control tank control subsystem and a sodium sulfate solution conveying circulating control subsystem. The invention realizes the efficient, stable and intelligent full flow control of the on-line reduction and recovery treatment of the electrolytic sodium sulfate solution in the production process of the stainless steel cold continuous rolling and improves the production efficiency of acid pickling.
Description
Technical Field
The invention relates to a technology for recycling an electrolytic sodium sulfate solution in the metallurgical industry, in particular to the technology for automatically controlling the processes of cyclic treatment and sludge disposal of the electrolytic sodium sulfate solution in a stainless steel cold continuous rolling, annealing and pickling production line.
Background
In the pickling process of the stainless steel cold continuous rolling annealing pickling production line, the electrolytic sodium sulfate pickling is adopted, so that the surface treatment quality of the strip steel can be effectively improved, the surface of the strip steel is uniform, the pickling cost is reduced, but the pickling process also has the following problems:
1. the generated waste electrolyte contains a large amount of high-toxicity hexavalent chromium ions, and the direct discharge can cause serious pollution to the environment.
2. In the electrolytic process, the electrolyte can generate a large amount of free hydrogen ions to enable the solution to gradually show acidity, and if the solution is not treated, the solution can corrode pipelines and equipment, so that the service lives of the pipelines and the equipment are shortened.
3. After the pickling process is operated for a long time, a large amount of iron ion and chromium ion oxidation sediments are easy to generate in the electrolyte and deposit, and the pickling pipeline can be blocked if the iron ion and chromium ion oxidation sediments are not treated.
In the aspect of process, the method generally adopts the step of adding 20 percent NaHSO into the waste electrolyte3Reducing hexavalent chromium ions by solution, adding 16% H2SO4Adjusting hexavalent chromium reduction environment by using the solution, and adding 20% of NaAdjusting the pH value of the electrolytic sodium sulfate solution after reduction by using OH solution, and adding sludge filter pressing facilities to treat sludge. The treatment process of the sodium sulfate solution relates to strong acid, strong alkali and hexavalent chromium compounds with strong toxicity in waste electrolyte, so that the design of a full-flow intelligent automatic control system is particularly important.
Disclosure of Invention
The invention provides a safe, reliable and intelligent control system for recycling electrolytic sodium sulfate solution, which aims to reduce the work flow related to the treatment of the electrolytic sodium sulfate solution on a production line, reduce the field workload of operators and provide intelligent, accurate and real-time information of the treatment process of the electrolytic sodium sulfate for the operators and production line managers through a human-computer interface.
The technical scheme of the invention is as follows:
an intelligent control system for recycling electrolytic sodium sulfate solution comprises a preparation and adding system and a circulating treatment system.
The preparation and feeding system comprises sodium bisulfite (NaHSO)3) Preparation subsystem, sodium bisulfite (NaHSO)3) A temperature control subsystem of the preparation tank, a sodium hydroxide (NaOH) preparation subsystem, a temperature control subsystem of the sodium hydroxide (NaOH) preparation tank, and sodium bisulfite (NaHSO)3) Feeding tank level control subsystem, sulfuric acid (dilution H)2SO4) A feeding tank level control subsystem and a sodium hydroxide (NaOH) feeding tank level control subsystem.
20 percent NaHSO needed to be used in purification and recovery of electrolytic sodium sulfate solution3Solution and 20% NaOH solution and diluted 16% H2SO4And (3) solution. When each subsystem selects automatic, the system can automatically inject condensed water and a prepared solution into the preparation tank according to the liquid level of each tank body or add the prepared solution into the adding tank from the preparation tank when the liquid level of the adding tank is lower than the lowest level.
Preparation tank for artificial feeding (NaHSO)3Or NaOH drug powder) intelligent prompting system, concentrated sulfuric acid (H2 SO)4) The feeding tank can automatically complete water injection and feed98 percent concentrated sulfuric acid solution, stirring and adding, and giving specific information of adding amount in the process.
The circulating treatment system comprises a reduction tank control subsystem, a control tank control subsystem, a circulating tank control subsystem, a sludge disposal control subsystem, a final control tank control subsystem and a sodium sulfate solution conveying circulating control subsystem.
The circulating treatment system reduces the sodium sulfate solution on the cold rolling treatment line under an acidic condition by adding sodium bisulfite into a reduction tank to remove hexavalent chromium in the sodium sulfate solution, adds sodium hydroxide into a control tank to neutralize the reduced trivalent chromium and iron ions contained in the solution into precipitates which are precipitated in a precipitation tank, removes mud through a filter press and sends the solution to the cold rolling line.
The reduction pot control subsystem includes PH adjustment and ORP adjustment.
Adjusting the pH value: when automatic selection is performed, the automatic pH value regulator is put into operation, the program automatically controls the opening and closing of the 20% sulfuric acid solution adding valve to regulate the pH value, and the pH value of the solution in the reduction tank is controlled at a set value. It should be noted that the PH of the electrolytic sodium sulfate solution to be reduced is 4.5, and when the hexavalent chromium ions are reduced, the hexavalent chromium ions can be sufficiently reduced only by adjusting the PH value to be 2.3-2.8, so the PH value is not too high, but too low, which causes the subsequent PH adjusting tank to require a large amount of NaOH solution to be added for neutralization and precipitation.
Adjusting an ORP value: when the automatic ORP value is selected, the automatic ORP value regulator is put into operation, the program automatically controls the opening and closing of the sodium bisulfite solution adding valve to regulate the ORP value, and the ORP value of the unreduced sodium sulfate solution is about 1000, which indicates that the content of hexavalent chromium in the solution is very high. The hexavalent chromium in the solution can be effectively reduced under the general setting of 250, and an operator can set the reduction value according to the process requirement.
And the control tank control subsystem adjusts the pH value of the reduced sodium sulfate solution by adding a sodium hydroxide solution into the control tank so as to neutralize and precipitate trivalent chromium generated by reduction and iron ions contained in the solution.
When automatic selection is performed, the automatic pH value regulator is put into operation, and the program automatically controls the opening and closing of the sodium hydroxide solution adding valve to regulate the pH value.
The circulating tank control subsystem is mainly used for controlling the liquid level of the circulating tank and the liquid level of the final control tank, so that the reduced electrolytic solution can effectively match the reduction capacity of the system and the sludge disposal capacity, and the sodium sulfate solution after reduction and precipitation is ensured to be effectively precipitated.
The treated sodium sulfate solution overflows through a settling tank to a final control tank. After the flocculent precipitate in the solution which is reduced and neutralized in the settling tank is settled for a certain time, the flocculent precipitate is filtered by the filter press, the subsystem for controlling the treatment of the cake pressing sludge needs to ensure that the pressure of the treatment liquid inlet of the filter press stably reaches the set value required by the pressure, and the whole set of filter pressing process, and the backwashing and pipeline flushing processes after the filter pressing are finished are automatically controlled.
And the final control tank control subsystem further adjusts the pH value of the treated sodium sulfate solution and sends the sodium sulfate solution back to the line by controlling the operation of the circulating pump.
Adjusting the pH value: when automatic selection is performed, the automatic pH value regulator is put into operation, and the automatic program regulates the pH value by controlling the opening and closing of the 20% sodium hydroxide solution feeding valve and the sulfuric acid solution feeding valve.
Considering that the final control tank needs to adjust and control the pH value of the treated sodium sulfate solution, the final control tank adopts a conveying mode of a power frequency pump and a reflux valve.
The sodium sulfate solution delivery circulation control subsystem ensures that sodium sulfate solution circulation in the purification system and the treatment line is established before the ORP value and pH value control program, the pH value control program, and the final pH value control program are introduced into the reduction tank control subsystem of the circulation treatment system.
The establishment of the conveying circulating system is realized by the coordination control of a sodium sulfate electrolysis end circulating pump group, a reducing solution section conveying pump group, a circulating pump group of a final control tank and an inlet valve of an electrolysis section purified sodium sulfate solution, and the pump groups are matched with each other to operate and need to set the operating parameters of each subsystem.
In addition, in the system, 20 percent of NaHSO is added into the reduction tank3The method comprises the steps of controlling a 20% NaOH solution added into a tank and a diluted 16% sulfuric acid solution, wherein the pH value of the solution is changed from the adding of a medicament solution to the complete chemical reaction with hexavalent chromium ions in a sodium sulfate solution, the whole process has considerable lag, great difficulty is brought to process control, and the change range of ORP is large (-100.0-1000.0). Under the condition, when the steel strip type is replaced or the flow of the sodium sulfate solution to be treated fluctuates greatly, the system is easy to be subjected to large overshoot, meanwhile, the waste of the medicament is brought, and in view of the defects, the dynamic amplitude limiting controller based on the sigmoid function is designed.
The Sigmoid function is defined as
The (e is a constant) function has a domain of (— ∞, + ∞) and a value domain of (0, 1), and as is clear from the image characteristics, the sigmoid function σ (x) approaches the linear function f (x) = x in the vicinity of x =0, gradually becomes gentle toward both sides, and when x =0<-6 or x>The function value is substantially unchanged at 6.
Therefore, the controller adopted by the design of the invention maps the ORP value of the solution to be reduced to the definition field (-4.0, 6.0) of the sigmoid function, and then calculates the corresponding value of the sigmoid function as the amplitude limiting reference value of the process controller.
The dynamic amplitude limiting ORP controller based on the sigmoid function well solves the problems of large process value change range and large process delay.
The circulation treatment system realizes the circulation of the waste electrolytic sodium sulfate solution, the automatic adjustment of the pH value of the solution in the reduction environment, the automatic reduction process control of the solution, the automatic pH value improvement of the solution after reduction, the full-automatic treatment of the precipitated sludge and the return of the electrolytic sodium sulfate solution which can be recycled after reduction treatment to the production line, realizes the intelligent automatic control in the whole process, and does not need manual intervention in the whole process.
The invention realizes the high efficiency, stability and high precision of the reduction control algorithm of the electrolytic sodium sulfate solution, and can effectively control the reduction process of the electrolytic sodium sulfate solution.
Drawings
FIG. 1 is a block diagram showing the construction of a preparation and addition control system according to the present invention.
FIG. 2 is a block diagram showing the structure of a loop processing system according to the present invention.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention.
The implementation of the invention relates to a control system for recycling electrolytic sodium sulfate solution, and the implementation of the invention comprises a preparation and dosing control system, a recycling treatment system and respective control subsystems as shown in figure 1.
The system comprises a sodium bisulfite preparation subsystem, a sodium bisulfite preparation tank temperature control subsystem, a sodium hydroxide preparation tank temperature control subsystem, a sodium bisulfite adding tank level control subsystem, a sulfuric acid adding tank level control subsystem and a sodium hydroxide adding tank level control subsystem, and the subsystems are in logic and time sequence incidence relation.
When the sodium bisulfite solution preparation subsystem and the temperature control subsystem select automatic operation, if the liquid level of the sodium bisulfite preparation tank is lower than a low liquid level (default value is 1.8 m), the system opens a water injection valve to automatically inject condensed water into the preparation tank, and when orange prompt sodium bisulfite feeding information appears, the system indicates that the system finishes automatic water injection at the moment, and the temperature control subsystem automatically puts into operation and adjusts the temperature of the solution to be not lower than a set value (36 ℃). When the worker has finished adding the sodium bisulfite medicament to the preparation tank, the operator needs to click the manual feed complete button on the screen to confirm that the solution preparation is complete.
When the sodium hydroxide solution preparation subsystem and the temperature control subsystem are selected automatically, if the liquid level of the sodium hydroxide preparation tank is lower than the low liquid level (default value is 1.5 m), the system opens a water injection valve to automatically inject the condensed water into the preparation tank, when the orange prompt sodium hydroxide feeding information appears, the system is indicated to finish automatic water injection, at the moment, the temperature control subsystem is automatically put into operation, and the solution temperature is adjusted to be not lower than a set value (36 ℃). When the worker finishes adding the sodium hydroxide medicament into the preparation tank, the operator needs to click a manual feeding completion button on the picture to confirm to complete the solution preparation.
When the sodium bisulfite feeding tank level control subsystem selects automatic, the control program can automatically control the supplement liquid level according to the current liquid level of the feeding tank, and when the liquid level is lower than the low liquid level (0.2 m), the sodium bisulfite feeding valve is opened, and the sodium bisulfite delivery pump is started to start to supplement the solution; when the liquid level reaches the end position, the valve is closed and the delivery pump is stopped.
When the sulfuric acid adding tank liquid level control subsystem is selected automatically, the program can automatically inject water according to the set value of the liquid level, and the feeding is prompted after the water injection is finished. When the concentrated sulfuric acid feeding information with the orange prompt appears, the system finishes automatic water injection at the moment, the automatic feeding program can calculate the amount of the concentrated sulfuric acid to be added according to the water injection amount, the concentrated sulfuric acid valve is automatically opened, the concentrated sulfuric acid transfer pump is started to inject the concentrated sulfuric acid quantitatively calculated by the control program into the feeding tank, the valve is automatically closed after the concentrated sulfuric acid transfer pump finishes, and the transfer pump is stopped.
When the liquid level control subsystem of the sodium hydroxide adding tank selects automatic, the control program can automatically control the supplement liquid level according to the current liquid level of the adding tank, and when the liquid level is lower than the low liquid level (0.2 m), a sodium hydroxide adding valve is opened, and a sodium hydroxide delivery pump is started to start supplementing the solution; when the liquid level reaches the end position, the valve is closed and the delivery pump is stopped.
The implementation of each subsystem in the preparation and dosing system in the embodiment, and the system design realizes the design goal of minimum manual intervention, and provides a humanized interaction mode.
The reduction tank control subsystem, the control tank control subsystem, the circulating tank control subsystem, the sludge disposal control subsystem, the final control tank control subsystem and the sodium sulfate solution conveying circulating control subsystem form a circulating treatment system, and logic and time sequence incidence relations exist among the subsystems.
The reduction pot control subsystem: the control of the control tank comprises pH value adjustment and ORP value adjustment, automatic selection is carried out, a pH value adjustment automatic control program is put into operation, the program automatically controls the opening and closing of a 16% sulfuric acid solution valve to adjust the pH value, and the pH value of the solution in the reduction tank is controlled below a set value (3.2); the ORP value adjusting automatic control program is put into operation, and the program automatically controls the opening and closing of the sodium bisulfite solution valve to adjust the ORP value.
Controlling the canister control subsystem: and (4) selecting automatic, and automatically controlling the opening and closing of a sodium hydroxide solution valve by a program to adjust the pH value of the reduced solution, and controlling the pH value to be close to a set value (7.5) for ensuring the precipitation effect.
The recycle tank control subsystem: automatic selection, automatic program put into operation. When the liquid level of the circulating tank is higher than the pump starting liquid level and lower than the allowable pump starting liquid level of the final control tank, the conveying pump is started to convey the reduced sodium sulfate liquid to the settling tank, and when the liquid level of the circulating tank is lowered to be lower than the pump stopping liquid level or the liquid level of the final control tank is higher than the pump stopping liquid level, the conveying pump stops running.
The sludge treatment control subsystem: the automatic control program controls an outlet valve of the settling tank according to a state signal provided by the filter press, and when the filter press gives a ready signal, the automatic control program opens the outlet valve to ensure the filter press to normally operate by adjusting the frequency of a frequency converter of the filtrate transmission pump; when the filter press gives a positive filtering signal, the outlet valve is closed, and the filter press runs back and forth in sequence.
Final control tank control subsystem: and (4) selecting automatic, putting an automatic control program into operation, and regulating the final pH value of the solution by controlling a sodium hydroxide solution valve and a 16% sulfuric acid solution valve.
The sodium sulfate solution conveying circulation control subsystem: the establishment of the conveying circulating system is realized by the coordination control of a sodium sulfate electrolysis end circulating pump group, a purification recovery section conveying pump group, a final control tank circulating pump group and an electrolysis section sodium sulfate solution purifying inlet valve.
Claims (7)
1. The intelligent control system for recycling the electrolytic sodium sulfate solution is characterized by comprising a preparation and addition control system and a circulating treatment control system; the preparation and adding control system consists of a sodium bisulfite preparation subsystem, a sodium bisulfite preparation tank temperature control subsystem, a sodium hydroxide preparation tank temperature control subsystem, a sodium bisulfite adding tank level control subsystem, a sulfuric acid adding tank level control subsystem and a sodium hydroxide adding tank level control subsystem; the circulating treatment control system consists of a reduction tank control subsystem, a control tank control subsystem, a circulating tank control subsystem, a sludge disposal control subsystem, a final control tank control subsystem and a sodium sulfate solution conveying circulating control subsystem.
2. The intelligent control system for recycling of electrolytic sodium sulfate solution according to claim 1, wherein when the liquid level of the preparation tank is lower than the set water injection level, the sodium bisulfite preparation subsystem or the sodium hydroxide preparation subsystem opens the water inlet valve to start to automatically add condensed water, and at this time, if the liquid level of the sodium bisulfite preparation subsystem or the sodium hydroxide preparation subsystem controlled by the liquid level of the corresponding reagent addition tank is lower than the lowest control liquid level, the sodium bisulfite preparation subsystem or the sodium hydroxide preparation subsystem will prevent the corresponding reagent addition tank from automatically starting to add the configured reagent solution into the addition tank; when the liquid level of the preparation tank is increased to the liquid level of the water injection stopping, the system can automatically calculate the amount of the medicament to be added and give a striking orange prompt on a human-computer interface; when the manual addition of the medicament is completed and confirmed, the system automatically starts to complete the subsequent stirring for a certain time and the temperature rise process control of the prepared solution is carried out through the temperature control subsystem.
3. The intelligent control system for recycling of electrolytic sodium sulfate solution according to claim 1, characterized in that: the temperature control subsystem of the preparation tank can be rapidly switched into an operation state after the addition of the medicament is finished, the temperature of the solution in the tank is adjusted to a set value by adjusting a pneumatic adjusting valve arranged on a steam heating pipeline of the preparation tank, and the temperature of the solution in the tank can be ensured to be in a stable state if the environmental temperature is too low when the preparation tank is not in the preparation process of the medicament solution.
4. The intelligent control system for recycling of electrolytic sodium sulfate solution according to claim 1, characterized in that: the dosing tank control subsystem comprises three subsystems of sodium bisulfite, sodium hydroxide and sulfuric acid, wherein the sodium bisulfite and sodium hydroxide system ensures the reserve volume of the dosing agent solution, when the liquid level of the solution in the dosing tank is insufficient, the prepared solution can be automatically conveyed from the preparation tank to the dosing tank, when the liquid level of the dosing tank is insufficient, the system can calculate and inject the required water volume according to the set concentration value, and then the system coordinates the injection of concentrated sulfuric acid into the concentrated sulfuric acid storage system for dilution.
5. The intelligent control system for recycling of electrolytic sodium sulfate solution according to claim 1, characterized in that: the reduction pot control subsystem comprises PH value regulation and ORP value regulation;
adjusting the pH value: when automatic selection is carried out, the automatic PH value regulator is put into operation, the program automatically controls the opening and closing of the 20% sulfuric acid solution adding valve to regulate the PH value, and the PH value of the solution in the reduction tank is controlled at a set value;
adjusting an ORP value: when the automatic ORP value is selected, the automatic ORP value regulator is put into operation, the program automatically controls the opening and closing of the sodium bisulfite solution adding valve to regulate the ORP value, and the operator sets the reduction value according to the process requirement.
6. The intelligent control system for recycling of electrolytic sodium sulfate solution according to claim 1, characterized in that: when the automatic operation is selected, the automatic PH value regulator is put into operation, the program automatically controls the opening and closing of the sodium hydroxide solution adding valve to regulate the PH value, whether the adding is related to the reduction tank control subsystem or not is judged, the reduction tank control subsystem is controlled to operate after the reduction tank control subsystem is put into operation, and the control tank control subsystem enters a waiting state when the reduction tank control subsystem stops operating.
7. The intelligent control system for recycling of electrolytic sodium sulfate solution according to claim 1, characterized in that: the circulating tank control subsystem is used for controlling the liquid level of the circulating tank and the liquid level of the final control tank, so that the sodium sulfate solution after reduction and precipitation is effectively precipitated; the sludge treatment control subsystem is used for controlling flocculent precipitates in the reduced and neutralized solution in the settling tank to be settled for a certain time and then filtered and pressed into cakes by a filter press; and finally, the tank control subsystem is controlled to further regulate the pH value of the treated sodium sulfate solution and control the operation of the circulating pump to send the sodium sulfate solution back to the line.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114230378A (en) * | 2021-12-27 | 2022-03-25 | 复旦大学 | Preparation method of redox-driven super-assembly intelligent door control system |
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Application publication date: 20210806 |