CN117023751A - System and method for controlling reaction flow in crystallization process of calcium fluoride fluidized bed - Google Patents

System and method for controlling reaction flow in crystallization process of calcium fluoride fluidized bed Download PDF

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CN117023751A
CN117023751A CN202311307196.4A CN202311307196A CN117023751A CN 117023751 A CN117023751 A CN 117023751A CN 202311307196 A CN202311307196 A CN 202311307196A CN 117023751 A CN117023751 A CN 117023751A
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徐建功
李佳蓬
袁香
仝辉
张子种
李志荣
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Jiangsu Daotong Environmental Technology Co ltd
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Abstract

The application discloses a control system and a control method for reaction flow in the crystallization process of a calcium fluoride fluidized bed, wherein the control system comprises an information input unit, a reactor water inlet flow unit corresponding to a treatment fluorine load, a reactor water inlet flow unit corresponding to an ascending flow rate, an optimal reaction flow unit and a signal output unit, and the reactor water inlet flow interval corresponding to the treatment fluorine load is obtained according to the reactor information and the treatment fluorine load interval; obtaining a reactor water inlet flow interval corresponding to the rising flow rate according to the reactor information and the rising flow rate interval; and obtaining the optimal reaction flow according to the reactor water inlet flow interval corresponding to the fluorine treatment load and the reactor water inlet flow interval corresponding to the rising flow rate. The application estimates the optimal reaction flow by processing the fluorine load and the rising flow rate, so the estimation accuracy is high.

Description

System and method for controlling reaction flow in crystallization process of calcium fluoride fluidized bed
Technical Field
The application relates to a control system and a control method for reaction flow in a crystallization process of a calcium fluoride fluidized bed, and belongs to the technical field of system control.
Background
The fluidized bed induced crystallization technology is that granular solid filler is added into a precipitation reaction system, the substance to be removed is crystallized and deposited on the surface of the filler, and solid particles are used as seed crystals and have a certain ascending flow rate and are fluidized; the main factors influencing the crystallization process of the fluidized bed are reaction flow, and because the reaction flow influences the fluorine concentration, the reflux quantity and the rising flow rate in the reaction process, how to accurately estimate the optimal reaction flow becomes a key link in the fluidized bed induced crystallization technology.
The optimal reaction flow in the existing calcium fluoride fluidized bed crystallization process is generally estimated to be approximate according to experience, and then is manually adjusted according to crystallization conditions in the crystallization reaction process, so that the optimal reaction flow cannot be accurately found in the mode, fine adjustment operation after crystallization reaction is easy to lag, the reaction supersaturation degree in a reactor is difficult to reduce, the dosage is large, the amount of fine suspended sludge is large, the crystallization effect is poor, the system is unstable, and the impact load is poor.
Disclosure of Invention
The application aims to: in order to overcome the defects in the prior art, the application provides a system and a method for controlling the reaction flow in the crystallization process of a calcium fluoride fluidized bed.
The technical scheme is as follows: in order to achieve the above purpose, the application adopts the following technical scheme:
the utility model provides a control system of reaction flow in calcium fluoride fluidized bed crystallization process, includes information input unit, concentration flow monitoring unit, handles the reactor inflow unit that fluorine load corresponds, rises the reactor inflow unit that the velocity of flow corresponds, best reaction flow unit, regulation and control unit, wherein:
the information input unit is used for inputting reactor information, processing fluorine load interval and rising flow rate interval.
The concentration flow monitoring unit is used for monitoring high-fluorine wastewater flow, high-fluorine wastewater concentration, low-fluorine blended wastewater flow, low-fluorine blended wastewater concentration, internal reflux flow and internal reflux concentration.
The reactor water inlet flow unit corresponding to the treatment fluorine load is used for obtaining a reactor water inlet flow interval corresponding to the treatment fluorine load according to the reactor information and the treatment fluorine load interval.
The reactor water inlet flow unit corresponding to the rising flow rate is used for obtaining a reactor water inlet flow interval corresponding to the rising flow rate according to the reactor information and the rising flow rate interval.
The optimal reaction flow unit is used for obtaining the optimal reaction flow according to the reactor water inlet flow interval corresponding to the fluorine treatment load and the reactor water inlet flow interval corresponding to the rising flow rate.
The regulation and control unit is used for establishing a regulation and control model according to the optimal reaction flow, the reaction fluorine concentration, the high fluorine wastewater flow, the high fluorine wastewater concentration, the low fluorine blended wastewater flow, the low fluorine blended wastewater concentration, the internal reflux flow, the internal reflux concentration and the internal reflux ratio. And obtaining the internal reflux concentration through a regulation model according to the high-fluorine wastewater flow and the initial internal reflux ratio. And monitoring the internal reflux concentration on line, and when the internal reflux concentration reaches a target low value, reducing the internal reflux ratio through a regulation model to improve the concentration of the reaction fluorine. After the system stably discharges water, the water inflow of the low-fluorine blended wastewater flow is regulated by a regulation and control model, and the minimum internal reflux ratio is taken, so that the concentration of the reacted fluorine is further improved.
Preferably: the reactor water inlet flow unit corresponding to the treatment fluorine load is provided with a reactor water inlet flow model corresponding to the treatment fluorine load, and a reactor water inlet flow interval corresponding to the treatment fluorine load is obtained through the reactor water inlet flow model corresponding to the treatment fluorine load. The reactor water inflow model corresponding to the fluorine load is:
;
;
wherein,the reactor water inflow rate corresponding to the set treatment fluorine load is shown,represents the diameter size of the reaction zone in the reactor,the surface loading of the fluorine treatment is shown,the concentration of the fluorine in the reaction is shown,represents the reactor water inflow interval corresponding to the fluorine load,represents the minimum value in the reactor water inflow interval corresponding to the treatment fluorine load,the maximum value in the reactor water inflow interval corresponding to the treatment fluorine load is shown.
Preferably: the reactor water inflow corresponding to the rising flow rate is provided with a reactor water inflow model corresponding to the rising flow rate, a reactor water inflow interval corresponding to the rising flow rate is obtained through the reactor water inflow model corresponding to the rising flow rate, and the reactor water inflow model corresponding to the rising flow rate is as follows:
;
;
wherein,represents the reactor water inflow corresponding to the rising flow rate,represents the diameter size of the reaction zone in the reactor,indicating the rate of rise of the flow,represents the water inflow interval of the reactor corresponding to the rising flow rate,representing the minimum value in the reactor water inflow interval corresponding to the rising flow rate,the maximum value in the reactor water inflow interval corresponding to the rising flow rate is shown.
Preferably: the optimal reaction flow unit is provided with an optimal reaction flow model, and the optimal reaction flow is obtained through the optimal reaction flow model, wherein the optimal reaction flow model is as follows:
;
in the method, in the process of the application,representation ofThe flow rate of the reaction is optimized,representing the intersection.
Preferably: the regulation model is as follows:
;
;
in the method, in the process of the application,the flow rate of the reaction is shown to be optimal,in order to react the concentration of fluorine,for the high flow rate of the fluorine wastewater,is used for the concentration of the high-fluorine wastewater,the flow rate of the wastewater is regulated for low fluorine,the concentration of the wastewater is regulated for low fluorine,for the internal reflux flow rate,for the concentration of the internal reflux,is the internal reflux ratio.
A control method of reaction flow in the crystallization process of a calcium fluoride fluidized bed adopts the control system of the reaction flow in the crystallization process of the calcium fluoride fluidized bed, and comprises the following steps:
step 1, obtaining reactor information, processing fluorine load interval and rising flow rate interval. Monitoring the concentration of the reaction fluorine, the flow rate of the high-fluorine wastewater, the concentration of the high-fluorine wastewater, the flow rate of the low-fluorine blended wastewater, the concentration of the low-fluorine blended wastewater, the internal reflux flow rate and the internal reflux concentration.
And 2, obtaining a reactor water inflow interval corresponding to the treatment fluorine load according to the reactor information and the treatment fluorine load interval.
And step 3, obtaining a reactor water inlet flow interval corresponding to the rising flow rate according to the reactor information and the rising flow rate interval.
And 4, obtaining the optimal reaction flow according to the reactor water inflow interval corresponding to the fluorine load and the reactor water inflow interval corresponding to the rising flow rate.
And 5, establishing a regulation and control model according to the optimal reaction flow, the reaction fluorine concentration, the high fluorine wastewater flow, the high fluorine wastewater concentration, the low fluorine blended wastewater flow, the low fluorine blended wastewater concentration, the internal reflux flow, the internal reflux concentration and the internal reflux ratio. And obtaining the internal reflux concentration through a regulation model according to the high-fluorine wastewater flow and the initial internal reflux ratio. And monitoring the internal reflux concentration on line, and when the internal reflux concentration reaches a target low value, reducing the internal reflux ratio through a regulation model to improve the concentration of the reaction fluorine. After the system stably discharges water, the water inflow of the low-fluorine blended wastewater flow is regulated by a regulation and control model, and the minimum internal reflux ratio is taken, so that the concentration of the reacted fluorine is further improved.
Preferably: and establishing a reactor water inflow model corresponding to the treatment fluorine load according to the reactor information and the treatment fluorine load interval, and obtaining the reactor water inflow interval corresponding to the treatment fluorine load through the reactor water inflow model corresponding to the treatment fluorine load. The reactor water inflow model corresponding to the fluorine load is:
;
;
wherein,the reactor water inflow rate corresponding to the set treatment fluorine load is shown,represents the diameter size of the reaction zone in the reactor,the surface loading of the fluorine treatment is shown,the concentration of the fluorine in the reaction is shown,represents the reactor water inflow interval corresponding to the fluorine load,represents the minimum value in the reactor water inflow interval corresponding to the treatment fluorine load,the maximum value in the reactor water inflow interval corresponding to the treatment fluorine load is shown.
Preferably: establishing a reactor water inlet flow rate model corresponding to the rising flow rate according to the reactor information and the rising flow rate interval, and obtaining the reactor water inlet flow rate interval corresponding to the rising flow rate through the reactor water inlet flow rate model corresponding to the rising flow rate, wherein the reactor water inlet flow rate model corresponding to the rising flow rate is as follows:
;
;
wherein,represents the reactor water inflow corresponding to the rising flow rate,represents the diameter size of the reaction zone in the reactor,indicating the rate of rise of the flow,represents the water inflow interval of the reactor corresponding to the rising flow rate,representing the minimum value in the reactor water inflow interval corresponding to the rising flow rate,the maximum value in the reactor water inflow interval corresponding to the rising flow rate is shown.
Preferably: establishing an optimal reaction flow model according to a reactor water inflow flow interval corresponding to the treatment fluorine load and a reactor water inflow flow interval corresponding to the rising flow rate, and obtaining the optimal reaction flow through the optimal reaction flow model, wherein the optimal reaction flow model is as follows:
;
in the method, in the process of the application,the flow rate of the reaction is shown to be optimal,representing the intersection.
Preferably: the regulation model is as follows:
;
;
in the method, in the process of the application,the flow rate of the reaction is shown to be optimal,in order to react the concentration of fluorine,for the high flow rate of the fluorine wastewater,is used for the concentration of the high-fluorine wastewater,the flow rate of the wastewater is regulated for low fluorine,the concentration of the wastewater is regulated for low fluorine,for the internal reflux flow rate,for the concentration of the internal reflux,is the internal reflux ratio.
Compared with the prior art, the application has the following beneficial effects:
the application obtains the optimal reaction flow based on the information of the reactor, the treatment fluorine load and the rising flow rate, so that the obtained optimal reaction flow is accurate, the estimation precision is high, and a regulation model is further obtained, and the internal reflux flow Q3 is regulated according to the regulation model so as to improve the concentration of the reaction fluorine (the concentration of the inlet water of the reactor)Further increasing the treatment load of the reactor, and automatically adjusting the flow of the low-fluorine blended wastewater by the control systemFurther improves the processing load and capacity of the system, and ensures that the system is stable and impact-resistantThe load is high.
Drawings
Fig. 1 is a schematic flow chart of an embodiment of the present application.
Fig. 2 is a schematic structural diagram of an embodiment of the present application.
Detailed Description
The present application is further illustrated in the accompanying drawings and detailed description which are to be understood as being merely illustrative of the application and not limiting of its scope, and various equivalent modifications to the application will fall within the scope of the application as defined in the appended claims after reading the application.
A control method of reaction flow in the crystallization process of a calcium fluoride fluidized bed, as shown in figure 1, comprises the following steps:
step 1, obtaining reactor information, processing fluorine load interval and rising flow rate interval. And monitoring the concentration of the reaction fluorine, the flow rate of the high-fluorine wastewater, the concentration of the high-fluorine wastewater, the flow rate of the low-fluorine blended wastewater, the concentration of the low-fluorine blended wastewater, the internal reflux flow rate and the internal reflux concentration in real time.
And 2, obtaining a reactor water inflow interval corresponding to the treatment fluorine load according to the reactor information and the treatment fluorine load interval.
And establishing a reactor water inflow model corresponding to the treatment fluorine load according to the reactor information and the treatment fluorine load interval, and obtaining the reactor water inflow interval corresponding to the treatment fluorine load through the reactor water inflow model corresponding to the treatment fluorine load. The reactor water inflow model corresponding to the fluorine load is:
;
;
wherein,the reactor water inflow rate corresponding to the set treatment fluorine load is shown,represents the diameter size of the reaction zone in the reactor,the surface loading of the fluorine treatment is shown,the concentration of the fluorine in the reaction is shown,represents the reactor water inflow interval corresponding to the fluorine load,represents the minimum value in the reactor water inflow interval corresponding to the treatment fluorine load,the maximum value in the reactor water inflow interval corresponding to the treatment fluorine load is shown. Substituting the initial set concentration of the reacted fluorineThe reactor water inflow corresponding to the set treatment fluorine load can be obtained.
And step 3, obtaining a reactor water inlet flow interval corresponding to the rising flow rate according to the reactor information and the rising flow rate interval.
Establishing a reactor water inlet flow rate model corresponding to the rising flow rate according to the reactor information and the rising flow rate interval, and obtaining the reactor water inlet flow rate interval corresponding to the rising flow rate through the reactor water inlet flow rate model corresponding to the rising flow rate, wherein the reactor water inlet flow rate model corresponding to the rising flow rate is as follows:
;
;
wherein,represents the reactor water inflow corresponding to the rising flow rate,represents the diameter size of the reaction zone in the reactor,indicating the rate of rise of the flow,represents the water inflow interval of the reactor corresponding to the rising flow rate,representing the minimum value in the reactor water inflow interval corresponding to the rising flow rate,the maximum value in the reactor water inflow interval corresponding to the rising flow rate is shown.
And 4, obtaining the optimal reaction flow according to the reactor water inflow interval corresponding to the fluorine load and the reactor water inflow interval corresponding to the rising flow rate.
Establishing an optimal reaction flow model according to a reactor water inflow flow interval corresponding to the treatment fluorine load and a reactor water inflow flow interval corresponding to the rising flow rate, and obtaining the optimal reaction flow through the optimal reaction flow model, wherein the optimal reaction flow model is as follows:
;
in the method, in the process of the application,the flow rate of the reaction is shown to be optimal,representing the intersection.
And respectively obtaining the treatment fluorine load corresponding to the optimal reaction flow and the rising flow velocity corresponding to the optimal reaction flow according to the optimal reaction flow.
And sending the obtained optimal reaction flow, the treatment fluorine load corresponding to the optimal reaction flow and the rising flow rate corresponding to the optimal reaction flow to a calcium fluoride fluidized bed crystallization reaction control system, wherein the calcium fluoride fluidized bed crystallization reaction control system controls the crystallization reaction of the calcium fluoride fluidized bed according to the optimal reaction flow, the treatment fluorine load corresponding to the optimal reaction flow and the rising flow rate corresponding to the optimal reaction flow.
And 5, establishing a regulation and control model according to the optimal reaction flow, the reaction fluorine concentration, the high fluorine wastewater flow, the high fluorine wastewater concentration, the low fluorine mixed wastewater flow, the low fluorine mixed wastewater concentration, the internal reflux flow, the internal reflux concentration and the internal reflux ratio, and regulating and controlling according to the regulation and control model.
;
;
In the method, in the process of the application,the flow rate of the reaction is shown to be optimal,the concentration of the fluorine in the reaction is shown,for the high flow rate of the fluorine wastewater,is used for the concentration of the high-fluorine wastewater,the flow rate of the wastewater is regulated for low fluorine,the concentration of the wastewater is regulated for low fluorine,for the internal reflux flow rate,for the concentration of the internal reflux,is the internal reflux ratio.
During regulation and control, high fluorine wastewater flow is inputHigh fluorine wastewater concentrationSetting initial internal reflux ratio(initial internal reflux ratio is set to 10-18) to obtain internal reflux flow. On-line monitoring of internal reflux concentrationWhen the internal reflux concentration isReaching the target low value (C3 is less than 8-10 mg/L), reducing the internal reflux ratioIncreasing the concentration of reacted fluorine within a set treatment fluorine loading zoneThereby increasing the reactor processing load. After the system stably discharges water, the flow of the low-fluorine blended wastewater is regulatedTaking the internal reflux ratio of the lowest value range(the internal reflux ratio in the low value range is 3-4), further improving the reactor throughput.
Detecting the molar concentration of the calcium ions in the solution and the molar concentration of the fluoride ions in the solution in real time, and selecting CaCl 2 As a precipitant, fluoride ions can be better crystallized under the condition of sufficient Ca < 2+ >, caCl is added according to the oversaturation index of the solution, the molar concentration of calcium ions in the solution and the molar concentration of fluoride ions in the solution 2 The calcium-fluorine ratio is adjusted to be between 0.5 and 1.5, the medicine is accurately added, and the operation cost is saved.
;
;
In the method, in the process of the application,indicating the supersaturation degree of the solution,represents the molar concentration of calcium ions in the solution,represents the molar concentration of fluorine ions in the solution,the chemical equilibrium constant of the solution is shown,indicating the supersaturation index of the solution.
And selecting a crystal discharging mode, wherein during the operation process of the fluidized bed, the crystal discharging can timely reduce the influence of the continuous increase of the sediment volume on the operation stability of the fluidized bed, the crystal discharging mode comprises a time control crystal discharging mode and a pressure difference control crystal discharging mode, the time control crystal discharging mode is that the crystal discharging time is set to be 20-30 minutes, an automatic crystal discharging valve is opened according to the cycle time setting, and calcium fluoride crystals are discharged out of the reactor. The differential pressure control crystal discharge mode is to automatically control layered crystal discharge according to the crystal mass increase and the pressure difference by setting a differential pressure value through a differential pressure analyzer.
The crystallization reaction of calcium fluoride can occur over a relatively wide pH range (pH 3-12). In general, not only calcium ions and fluoride ions but also other compounds and ions are present in wastewater. These ions or compounds may also react with calcium ions (e.g., phosphate, carbonate). The ion selectivity of the precipitation process, and thus the purity of the crystals that it causes to precipitate, is affected by the pH. The pH value of the reactor is controlled between 6 and 8.5, so that stable reaction efficiency can be obtained, and the reactor is automatically controlled by a dosing control unit.
The selected crystal seed is quartz sand which has strong capability of inducing precipitation reaction, good sediment adhesion, good sedimentation performance, good fluidization, stable property, higher strength and no magnetism, when the section rising flow rate, supersaturation degree and crystal seed particle diameter in the reactor are increased, the linear growth rate of calcium fluoride in the fluidized bed reactor is increased along with the rising, the control range of the flow rate of the fluidized bed is enlarged, and the stable operation control of the fluidized bed is more beneficial. The diameter of the quartz sand particles selected by the application is 400-1300 mu m.
Relationship between fluidized bed pressure difference and crystal quality in the reactor:
in the method, in the process of the application,indicating fluidized bed layer numberThe difference in the layer pressure is such that,indicating the mass of crystals in the fluidized bed,indicating the mass of fluid corresponding to the volume of the crystal,represents the gravity coefficient and d represents the diameter size of the reaction zone in the reactor。
The fluidized bed layer in the reactor is 3 layers, the 1 st layer of the fluidized bed is fine grain size crystal, the 2 nd layer of the fluidized bed is grain size crystal, the 3 rd layer of the fluidized bed is coarse grain size crystal, and when the pressure difference of the 1 st layer of the fluidized bed is thatWhen reaching 100kPa, the first layer crystal discharging valve is automatically opened, and the pressure difference of the 1 st layer of the fluidized bed layer is reducedWhen the pressure is reduced to 80kPa, the first layer crystal discharging valve is closed, namely the crystal discharging pressure difference of the layer 1 of the fluidized bed is 100 to 80kPa, the crystal discharging pressure difference of the layer 2 of the fluidized bed is 75 to 65kPa, and the crystal discharging pressure difference of the layer 3 of the fluidized bed is 50 to 60kPa.
The concentration of the high-fluorine wastewater can be 2000-4000mg/L, the concentration of the low-fluorine wastewater does not exceed 1500mg/L, and the system automatically controls the concentration of fluorine in the middle pool to be in a concentration range of 150-400 mg/L. The adjusting mode is to output parameters through an online fluoride ion concentration detection instrument of the middle tank, and set flow and load adjusting programs through specific numerical values of the parameters, so that the stability and impact resistance of the system are ensured. The pH on-line detection instrument is arranged in an intermediate water tank, and the pH value of the intermediate water tank is controlled to be between 6 and 8.5 so as to maintain the reaction condition of the optimal crystallized particles. The concentration of fluorine ions in the inlet water is taken as output data in mg/L, and the data can be converted into data of molar concentration, namely: mol/L, by means of the molar concentration data. The concentration of calcium ions is a fixed value, namely 25%, and the concentration data can be converted into molar concentration, namely: mol/L. Therefore, according to the set molar concentration value of 1:1-1:3, the consumption of the precipitant (calcium ions) can be adjusted according to the inlet water concentration and the inlet water amount, and then the operation parameters of the equipment can be automatically adjusted.
The pressure sensor and the differential pressure analyzer are arranged at the middle bottom of the fluidized bed reactor main body, so that the pressure difference of each fluidized bed layer can be monitored in real time, when the pressure difference of the fluidized bed layer exceeds a set value, calcium fluoride precipitates are fully formed and deposited in the layer area, at the moment, the corresponding level crystal discharge automatic valve can be opened until the pressure difference of the fluidized bed layer reaches the set value, and intelligent control crystal discharge is realized. The second mode of program setting is periodic crystal discharge, the crystal discharge period is set according to the size and growth state of crystal particles, and program parameter values are input by combining on-site operation debugging and a bottom crystal discharge sampling valve.
And obtaining the optimal reaction flow according to the reactor water inlet flow interval corresponding to the fluorine treatment load and the reactor water inlet flow interval corresponding to the rising flow rate. Regulating internal reflux flow Q3 according to the regulation model to improve the water inlet concentration (reaction fluorine concentration) of the reactorFurther improving the treatment load of the reactor, and automatically adjusting the flow of the low-fluorine blended wastewater by the control systemFurther improving the processing load and capacity of the system.
According to the fluorine concentration of the inlet water, different adding control modes can be adjusted. When the inlet water concentration is low, the concentration of calcium ions can be intelligently reduced in time, and meanwhile, the dosing point interval is reduced; when the inlet water concentration is higher, the concentration of calcium ions is intelligently increased, the concentration impact change can be stably coped with, the occurrence of homogeneous nucleation is maximally restrained, the impact load resistance of the reactor can be greatly improved, the accurate supply amount of the calcium ions is controlled, and the running cost is minimized.
A control system for reaction flow in crystallization of calcium fluoride fluidized bed, as shown in figure 2, comprises an information input unit, a concentration flow monitoring unit, a reactor water inlet flow unit corresponding to the treatment fluorine load, a reactor water inlet flow unit corresponding to the rising flow rate, an optimal reaction flow unit, and a regulation and control unit, wherein:
the information input unit is used for inputting reactor information, processing fluorine load interval and rising flow rate interval.
The concentration flow monitoring unit is used for monitoring high-fluorine wastewater flow, high-fluorine wastewater concentration, low-fluorine blended wastewater flow, low-fluorine blended wastewater concentration, internal reflux flow and internal reflux concentration.
The reactor water inlet flow unit corresponding to the treatment fluorine load is used for obtaining a reactor water inlet flow interval corresponding to the treatment fluorine load according to the reactor information and the treatment fluorine load interval.
The reactor water inlet flow unit corresponding to the treatment fluorine load is provided with a reactor water inlet flow model corresponding to the treatment fluorine load, and a reactor water inlet flow interval corresponding to the treatment fluorine load is obtained through the reactor water inlet flow model corresponding to the treatment fluorine load. The reactor water inflow model corresponding to the fluorine load is:
;
;
wherein,the reactor water inflow rate corresponding to the set treatment fluorine load is shown,represents the diameter size of the reaction zone in the reactor,the surface loading of the fluorine treatment is shown,the concentration of the fluorine in the reaction is shown,represents the reactor water inflow interval corresponding to the fluorine load,represents the minimum value in the reactor water inflow interval corresponding to the treatment fluorine load,the maximum value in the reactor water inflow interval corresponding to the treatment fluorine load is shown.
The reactor water inlet flow unit corresponding to the rising flow rate is used for obtaining a reactor water inlet flow interval corresponding to the rising flow rate according to the reactor information and the rising flow rate interval.
The reactor water inflow corresponding to the rising flow rate is provided with a reactor water inflow model corresponding to the rising flow rate, a reactor water inflow interval corresponding to the rising flow rate is obtained through the reactor water inflow model corresponding to the rising flow rate, and the reactor water inflow model corresponding to the rising flow rate is as follows:
;
;
wherein,represents the reactor water inflow corresponding to the rising flow rate,represents the diameter size of the reaction zone in the reactor,indicating the rate of rise of the flow,represents the water inflow interval of the reactor corresponding to the rising flow rate,representing the minimum value in the reactor water inflow interval corresponding to the rising flow rate,the maximum value in the reactor water inflow interval corresponding to the rising flow rate is shown.
The optimal reaction flow unit is used for obtaining the optimal reaction flow according to the reactor water inlet flow interval corresponding to the fluorine treatment load and the reactor water inlet flow interval corresponding to the rising flow rate.
The optimal reaction flow unit is provided with an optimal reaction flow model, and the optimal reaction flow is obtained through the optimal reaction flow model, wherein the optimal reaction flow model is as follows:
;
in the method, in the process of the application,the flow rate of the reaction is shown to be optimal,representing the intersection.
The regulation and control unit is used for establishing a regulation and control model according to the optimal reaction flow, the reaction fluorine concentration, the high fluorine wastewater flow, the high fluorine wastewater concentration, the low fluorine blended wastewater flow, the low fluorine blended wastewater concentration, the internal reflux flow, the internal reflux concentration and the internal reflux ratio; obtaining internal reflux concentration through a regulation model according to the high-fluorine wastewater flow and the initial internal reflux ratio; on-line monitoring the internal reflux concentration, and when the internal reflux concentration reaches a target low value, reducing the internal reflux ratio through a regulation model to improve the concentration of the reaction fluorine; after the system stably discharges water, the water inflow of the low-fluorine blended wastewater flow is regulated by a regulation and control model, and the minimum internal reflux ratio is taken, so that the concentration of the reacted fluorine is further improved.
In one embodiment of the application, inputting reactor information includes: the diameter of the reaction zone of the reactor is 1.2m; the fluorine treatment area load f is 3.2-6.8kg/m2.H; the rising flow rate of the reaction zone of the reactor is 12-35m/h; the reflux ratio R is 6-18; setting the water inlet C0 to be 200mg/L; the height of the reaction zone is 1.6m; the diameter of the clarification area of the reactor is 2.6m; height 2m; the high-concentration fluorine-containing wastewater Q1 is 1m3/h, the F concentration is 2500-4000mg/L, the low-fluorine wastewater Q2 is 6m3/h, and the F concentration is 60-1500mg/L. And (3) monitoring the reaction flow and concentration, finding out the optimal reaction flow Q0 for running to be 15m < 3 >/h according to a set regulation and control model, and treating the fluorine concentration to be 452mg/L.
The application allows the obtained optimal reaction flow to be accurate by considering the reactor information, the treatment fluorine load and the rising flow rate together, thereby enabling the supply amount of the calcium ions to be more accurate. So that the impact load resistance of the calcium fluoride fluidized bed in the crystallization process is greatly improved, and the operation cost is low.
The foregoing is only a preferred embodiment of the application, it being noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present application, and such modifications and adaptations are intended to be comprehended within the scope of the application.

Claims (10)

1. A control system for reaction flow in the crystallization process of a calcium fluoride fluidized bed is characterized in that: the device comprises an information input unit, a concentration flow monitoring unit, a reactor water inlet flow unit corresponding to a fluorine load, a reactor water inlet flow unit corresponding to an ascending flow rate, an optimal reaction flow unit and a regulation and control unit, wherein:
the information input unit is used for inputting reactor information, processing a fluorine load interval and an ascending flow rate interval;
the concentration flow monitoring unit is used for monitoring high-fluorine wastewater flow, high-fluorine wastewater concentration, low-fluorine blended wastewater flow, low-fluorine blended wastewater concentration, internal reflux flow and internal reflux concentration;
the reactor water inlet flow unit corresponding to the treatment fluorine load is used for obtaining a reactor water inlet flow interval corresponding to the treatment fluorine load according to the reactor information and the treatment fluorine load interval;
the reactor water inlet flow unit corresponding to the rising flow rate is used for obtaining a reactor water inlet flow interval corresponding to the rising flow rate according to the reactor information and the rising flow rate interval;
the optimal reaction flow unit is used for obtaining optimal reaction flow according to a reactor water inlet flow interval corresponding to the fluorine treatment load and a reactor water inlet flow interval corresponding to the rising flow rate;
the regulation and control unit is used for establishing a regulation and control model according to the optimal reaction flow, the reaction fluorine concentration, the high fluorine wastewater flow, the high fluorine wastewater concentration, the low fluorine blended wastewater flow, the low fluorine blended wastewater concentration, the internal reflux flow, the internal reflux concentration and the internal reflux ratio; obtaining internal reflux concentration through a regulation model according to the high-fluorine wastewater flow and the initial internal reflux ratio; on-line monitoring the internal reflux concentration, and when the internal reflux concentration reaches a target low value, reducing the internal reflux ratio through a regulation model to improve the concentration of the reaction fluorine; after the system stably discharges water, the water inflow of the low-fluorine blended wastewater flow is regulated by a regulation and control model, and the minimum internal reflux ratio is taken, so that the concentration of the reacted fluorine is further improved.
2. The control system for the reaction flow rate in the crystallization process of the calcium fluoride fluidized bed according to claim 1, wherein: the reactor water inlet flow unit corresponding to the treatment fluorine load is provided with a reactor water inlet flow model corresponding to the treatment fluorine load, and a reactor water inlet flow interval corresponding to the treatment fluorine load is obtained through the reactor water inlet flow model corresponding to the treatment fluorine load; the reactor water inflow model corresponding to the fluorine load is:
;
;
wherein,indicates the reactor water inflow corresponding to the set treatment fluorine load,/->Represents the diameter size of the reaction zone in the reactor, +.>Represents the fluorine treatment surface load, +.>Indicating the concentration of reactive fluorine,/->Represents the reactor water inflow interval corresponding to the treatment fluorine load,/->Representing the minimum value in the reactor water inflow interval corresponding to the treatment fluorine load, +.>The maximum value in the reactor water inflow interval corresponding to the treatment fluorine load is shown.
3. The control system for the reaction flow rate in the crystallization process of the calcium fluoride fluidized bed according to claim 2, wherein: the reactor water inflow corresponding to the rising flow rate is provided with a reactor water inflow model corresponding to the rising flow rate, a reactor water inflow interval corresponding to the rising flow rate is obtained through the reactor water inflow model corresponding to the rising flow rate, and the reactor water inflow model corresponding to the rising flow rate is as follows:
;
;
wherein,indicating the reactor water inflow corresponding to the rising flow rate,/->Represents the diameter size of the reaction zone in the reactor, +.>Indicating rising flow rate, +.>Indicating the reactor inlet corresponding to the rising flow rateWater flow interval>Representing the minimum value in the reactor water inflow interval corresponding to the rising flow rate, +.>The maximum value in the reactor water inflow interval corresponding to the rising flow rate is shown.
4. A control system for the reaction flow rate during crystallization of a fluidized bed of calcium fluoride according to claim 3, wherein: the optimal reaction flow unit is provided with an optimal reaction flow model, and the optimal reaction flow is obtained through the optimal reaction flow model, wherein the optimal reaction flow model is as follows:
;
in the method, in the process of the application,indicating the optimal reaction flow, +.>Representing the intersection.
5. The control system for the reaction flow rate in the crystallization process of the calcium fluoride fluidized bed according to claim 4, wherein: the regulation model is as follows:
;
;
in the method, in the process of the application,indicating the optimal reaction flow, +.>For the reaction of fluorine concentration, +.>Is high in fluorine wastewater flow rate->Is high in fluorine wastewater concentration->Regulating the flow of wastewater for low fluorine>Preparing wastewater concentration for low fluorine>For internal reflux flow, ++>For internal reflux concentration->Is the internal reflux ratio.
6. A method for controlling the reaction flow rate in the crystallization process of a calcium fluoride fluidized bed, which is characterized in that the control system for the reaction flow rate in the crystallization process of the calcium fluoride fluidized bed according to claim 1 is adopted, and comprises the following steps:
step 1, obtaining reactor information, processing a fluorine load interval and an ascending flow rate interval; monitoring the concentration of reaction fluorine, the flow rate of high-fluorine wastewater, the concentration of high-fluorine wastewater, the flow rate of low-fluorine blending wastewater, the concentration of low-fluorine blending wastewater, the flow rate of internal reflux and the concentration of internal reflux;
step 2, obtaining a reactor water inflow interval corresponding to the treatment fluorine load according to the reactor information and the treatment fluorine load interval;
step 3, obtaining a reactor water inlet flow interval corresponding to the rising flow rate according to the reactor information and the rising flow rate interval;
step 4, obtaining optimal reaction flow according to a reactor water inflow interval corresponding to the fluorine load and a reactor water inflow interval corresponding to the rising flow rate;
step 5, establishing a regulation and control model according to the optimal reaction flow, the reaction fluorine concentration, the high fluorine wastewater flow, the high fluorine wastewater concentration, the low fluorine blended wastewater flow, the low fluorine blended wastewater concentration, the internal reflux flow, the internal reflux concentration and the internal reflux ratio; obtaining internal reflux concentration through a regulation model according to the high-fluorine wastewater flow and the initial internal reflux ratio; on-line monitoring the internal reflux concentration, and when the internal reflux concentration reaches a target low value, reducing the internal reflux ratio through a regulation model to improve the concentration of the reaction fluorine; after the system stably discharges water, the water inflow of the low-fluorine blended wastewater flow is regulated by a regulation and control model, and the minimum internal reflux ratio is taken, so that the concentration of the reacted fluorine is further improved.
7. The method for controlling the reaction flow rate in the crystallization process of the calcium fluoride fluidized bed according to claim 6, wherein: establishing a reactor water inflow model corresponding to the treatment fluorine load according to the reactor information and the treatment fluorine load interval, and obtaining the reactor water inflow interval corresponding to the treatment fluorine load through the reactor water inflow model corresponding to the treatment fluorine load; the reactor water inflow model corresponding to the fluorine load is:
;
;
wherein,indicates the reactor water inflow corresponding to the set treatment fluorine load,/->Represents the diameter size of the reaction zone in the reactor, +.>Represents the fluorine treatment surface load, +.>Indicating the concentration of reactive fluorine,/->Represents the reactor water inflow interval corresponding to the treatment fluorine load,/->Representing the minimum value in the reactor water inflow interval corresponding to the treatment fluorine load, +.>The maximum value in the reactor water inflow interval corresponding to the treatment fluorine load is shown.
8. The method for controlling the reaction flow rate in the crystallization process of the calcium fluoride fluidized bed according to claim 7, wherein: establishing a reactor water inlet flow rate model corresponding to the rising flow rate according to the reactor information and the rising flow rate interval, and obtaining the reactor water inlet flow rate interval corresponding to the rising flow rate through the reactor water inlet flow rate model corresponding to the rising flow rate, wherein the reactor water inlet flow rate model corresponding to the rising flow rate is as follows:
;
;
wherein,indicating rising flow velocity pairsThe water inflow of the corresponding reactor is->Represents the diameter size of the reaction zone in the reactor, +.>Indicating rising flow rate, +.>Indicating the inlet flow interval of the reactor corresponding to the rising flow rate,/->Representing the minimum value in the reactor water inflow interval corresponding to the rising flow rate, +.>The maximum value in the reactor water inflow interval corresponding to the rising flow rate is shown.
9. The method for controlling the reaction flow rate in the crystallization process of the calcium fluoride fluidized bed according to claim 8, wherein: establishing an optimal reaction flow model according to a reactor water inflow flow interval corresponding to the treatment fluorine load and a reactor water inflow flow interval corresponding to the rising flow rate, and obtaining the optimal reaction flow through the optimal reaction flow model, wherein the optimal reaction flow model is as follows:
;
in the method, in the process of the application,indicating the optimal reaction flow, +.>Representing the intersection.
10. The method for controlling the reaction flow rate in the crystallization process of the calcium fluoride fluidized bed according to claim 9, wherein: the regulation model is as follows:
;
;
in the method, in the process of the application,indicating the optimal reaction flow, +.>For the reaction of fluorine concentration, +.>Is high in fluorine wastewater flow rate->Is high in fluorine wastewater concentration->Regulating the flow of wastewater for low fluorine>Preparing wastewater concentration for low fluorine>For internal reflux flow, ++>For internal reflux concentration->Is the internal reflux ratio.
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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101143750A (en) * 2007-06-28 2008-03-19 北京工业大学 Control device and method for four-section water-feeding A/O technique water-feeding flow rate distribution process
CN102859013A (en) * 2009-09-03 2013-01-02 纳幕尔杜邦公司 Titanium bearing material flow control in the manufacture of titanium tetrachloride using a combination of feedback and feed forward responses
CN105836866A (en) * 2016-06-14 2016-08-10 南昌航空大学 Calcium fluoride (CaF2) induction crystallization process from rare-earth metal smelting high-fluoride wastewater
CN114573120A (en) * 2022-05-06 2022-06-03 齐鲁工业大学 Multivariable control method, device and system for coal chemical industry grey water granulation and hardness removal
CN115282886A (en) * 2022-07-18 2022-11-04 湖南中蓝新材料科技有限公司 Particle flow control method and control system for overflow cup blanking of multilayer fluidized bed
CN115340204A (en) * 2022-06-28 2022-11-15 江苏中电创新环境科技有限公司 Continuous production type defluorination system based on fluidized bed
CN115784408A (en) * 2022-08-31 2023-03-14 哈尔滨工业大学 Method for removing phosphorus, fluorine and heavy metals in wastewater by using modified seed crystal for induced crystallization
CN219950761U (en) * 2023-05-19 2023-11-03 烟台金正环保科技有限公司 High-salt fluorine-containing wastewater defluorination and resource utilization treatment system

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101143750A (en) * 2007-06-28 2008-03-19 北京工业大学 Control device and method for four-section water-feeding A/O technique water-feeding flow rate distribution process
CN102859013A (en) * 2009-09-03 2013-01-02 纳幕尔杜邦公司 Titanium bearing material flow control in the manufacture of titanium tetrachloride using a combination of feedback and feed forward responses
CN105836866A (en) * 2016-06-14 2016-08-10 南昌航空大学 Calcium fluoride (CaF2) induction crystallization process from rare-earth metal smelting high-fluoride wastewater
CN114573120A (en) * 2022-05-06 2022-06-03 齐鲁工业大学 Multivariable control method, device and system for coal chemical industry grey water granulation and hardness removal
CN115340204A (en) * 2022-06-28 2022-11-15 江苏中电创新环境科技有限公司 Continuous production type defluorination system based on fluidized bed
CN115282886A (en) * 2022-07-18 2022-11-04 湖南中蓝新材料科技有限公司 Particle flow control method and control system for overflow cup blanking of multilayer fluidized bed
CN115784408A (en) * 2022-08-31 2023-03-14 哈尔滨工业大学 Method for removing phosphorus, fluorine and heavy metals in wastewater by using modified seed crystal for induced crystallization
CN219950761U (en) * 2023-05-19 2023-11-03 烟台金正环保科技有限公司 High-salt fluorine-containing wastewater defluorination and resource utilization treatment system

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