CN112286245A - pH composite cooperative regulation and control system and method based on feedforward-feedback - Google Patents
pH composite cooperative regulation and control system and method based on feedforward-feedback Download PDFInfo
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- CN112286245A CN112286245A CN202011288133.5A CN202011288133A CN112286245A CN 112286245 A CN112286245 A CN 112286245A CN 202011288133 A CN202011288133 A CN 202011288133A CN 112286245 A CN112286245 A CN 112286245A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D21/00—Control of chemical or physico-chemical variables, e.g. pH value
- G05D21/02—Control of chemical or physico-chemical variables, e.g. pH value characterised by the use of electric means
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/001—Upstream control, i.e. monitoring for predictive control
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/003—Downstream control, i.e. outlet monitoring, e.g. to check the treating agents, such as halogens or ozone, leaving the process
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/40—Liquid flow rate
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Abstract
The invention discloses a pH composite cooperative regulation and control system and method based on feedforward-feedback. The method is based on automatic proportional calculation of the water inlet quantity, the water inlet quality and the like, feed-forward regulation is realized in advance, on the basis, a preset pH value is taken as a feedback value, a real-time pH value of outlet water is taken as a feed-forward value, and the feed-forward value is subjected to synergistic micro-regulation through a PID algorithm, so that the functions of continuous sampling, real-time tracking analysis, good impact load resistance, two-step synergistic composite precise periodic regulation, timely stability and the like can be realized, the sensitivity is high, the unprecedented performance is strong, the deviation is high, the pH value of the outlet water is stable, and the problems that the traditional regulation method cannot adapt to the operation condition of the fluctuating inlet water quantity.
Description
Technical Field
The invention belongs to the technical field of water treatment, and relates to a pH composite cooperative regulation and control system and method based on feedforward-feedback.
Background
The pH value of water (namely pH value) has a crucial influence on the physical and chemical properties (such as solubility product, ion form, distribution ratio, chemical reaction process and the like) of water components. For example, in the traditional flocculation clarification process, water softening, hardness reduction, turbidity removal and the like can be realized by adding alkaline medicines such as slaked lime, sodium hydroxide and the like; adding a pH regulator before a filtering process (such as a filter, ultrafiltration, reverse osmosis and the like) to meet the water quality requirement of inlet water of a subsequent system so as to avoid filter material blockage, membrane pollution and scaling and the like; in EDI systems, sodium hydroxide is often added to maintain a pH of 8.3 prior to EDI feed water to remove almost all of the CO2Avoidance of CO2Influence on the quality of produced water. Many processes have extremely high requirements on the stability of the pH value, the regulation and control need to be timely and accurate, and the fluctuation amplitude cannot be too fast or too large. Most current processes improve the use of a pipeline mixer as a mixing element, and calculate the dosage of the pH regulator by using the pH value of the inlet water and the required pH value as feed-forward parameters, and have the following problems: the mixing effect of the mixing element and the position of the sampling mode have extremely high requirements; the pH value after actual adjustment has strong hysteresis with the calculation of the medicine, so that the pH value is untimely; the change of the water inlet flow and the water inlet pH of the system is fast, so that the required pH regulator dosage cannot be accurately obtained in real time by using a conventional calculation method, and the regulation and control speed is not timely, so that the fluctuation of a pH curve is obvious, and the normal operation of a subsequent system is even influenced.
In view of the above reasons, in order to solve the problems that the traditional pH single-parameter adjustment mode cannot adapt to the operation condition of the water quality of the fluctuating inflow water, and has strong hysteresis, large fluctuation and poor adjustment stability, it is necessary to develop and design a pH composite cooperative regulation and control system which is suitable for the fluctuating inflow water condition, is stable in real time, has small fluctuation and can be accurately pre-judged and controlled.
Disclosure of Invention
The invention aims to solve the problems in the prior art, and provides a feedforward-feedback-based pH composite cooperative regulation and control system and method which are suitable for the quality of fluctuating inflow water, are stably regulated in real time, have small fluctuation and can be accurately pre-judged and controlled.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a pH composite cooperative regulation and control system based on feed-forward-feed-backward comprises:
the mixing unit is arranged on a water outlet pipeline of the front system, a water inlet parameter collecting unit is arranged at a water inlet of the mixing unit, and a water outlet parameter collecting unit is arranged at a water outlet of the mixing unit;
the water inlet parameter collecting unit is used for collecting the real-time inlet water quantity and the inlet water pH value of the inlet water of the mixing unit and sending the real-time inlet water quantity and the inlet water pH value to the data acquisition and analysis regulation and control unit;
the water outlet parameter collecting unit is used for collecting the pH value of the outlet water of the mixing unit and sending the pH value of the outlet water to the data acquisition and analysis regulation and control unit;
and the data acquisition and analysis regulation and control unit calculates a feed-forward regulation parameter according to the real-time water inflow amount and the water inflow pH value and calculates a post-feed micro-regulation parameter according to a preset pH value and the water outflow pH value.
The invention further improves the following steps:
the water inlet parameter collecting unit comprises a water inlet flow meter, a water inlet online pH monitor, a water inlet sampling device and a matched pipeline valve; the data output ends of the water inlet flow meter and the water inlet online pH monitor are connected with the data acquisition and analysis regulation and control unit.
The water outlet parameter collecting unit comprises an outlet water online pH monitor, an outlet water sampling device and a matched pipeline valve; the data output end of the effluent online pH monitor is connected with the data acquisition and analysis regulation and control unit.
The inner diameter of the pipeline of the mixing element is D, and the distance between the sampling ports of the water inlet sampling device and the water outlet sampling device is more than or equal to 10D from the pH regulator dosing point of the mixing element.
The mixing unit comprises a mixing element, a medicine storage device and a pipeline valve matched with medicine adding; the medicine storage device is internally provided with a pH regulator, a medicine feeding point is arranged on a water outlet pipeline of the front system, a mixing element is arranged on the medicine feeding point and connected with the medicine storage device through a pipeline, and an electric control valve is arranged on the pipeline and connected with a data acquisition and analysis regulation and control unit.
The data acquisition and analysis regulation and control unit comprises a storage module, an operation module and a data transmission module, wherein the operation module transmits the calculated feedforward adjustment parameters and the calculated feedback fine adjustment parameters to the mixing unit, controls the opening of the electric control valve and adjusts the adding amount of the pH regulator.
And the data sending module is connected with the terminal equipment and is used for outputting the pH value of the outlet water, the water inlet amount and the change curve information of the pH value of the inlet water.
A pH composite cooperative regulation and control method based on feedforward-feedback comprises the following steps:
the real-time water inlet amount and the water inlet pH value of the mixing unit are collected and sent to the data collection and analysis regulation unit as feed-forward data; the data acquisition and analysis regulation and control unit calculates the required dosage of the pH regulator according to the water inlet amount and the set dosage, and sends the dosage to the mixing unit as a feedforward regulation parameter;
collecting the pH value of the effluent of the mixing unit, and sending the pH value of the effluent to a data collecting and analyzing regulation and control unit; the data acquisition and analysis regulation and control unit calculates feedback fine regulation parameters by taking a preset pH value as a feedback value and taking a water outlet pH value as a feed forward value and sends the feedback fine regulation parameters to the mixing unit;
and the mixing unit carries out cooperative composite regulation and control on the pH value according to the feedforward regulation parameters and the feedback fine regulation parameters, and carries out two-step cooperative calculation by taking the pH value of the outlet water as the feedforward value again, and repeatedly adjusts the pH value to regulate and control the quality of the inlet water of a subsequent system.
The method is further improved in that:
the feed forward tuning parameters are calculated according to the following formula:
wherein Q ispThe design flow of a dosing metering pump is shown, and L/h is shown; c0Representing the calculated dosage of the medicament, mg/L; q represents the designed treatment amount of wastewater, m3H; c represents the preparation concentration,% (wt) when the medicament is added; ρ represents the density in kg/L at the concentration of the formulation.
The feedback fine adjustment is calculated according to the following formula:
wherein, mu(t)To output a feedback value, e(t)For inputting feed-forward values, KpIs a proportionality coefficient, TiTo integrate the time constant, TdIs the differential time constant.
Compared with the prior art, the invention has the following beneficial effects:
1. continuous sampling: the sampling process adopts automatic continuous control, and the problem that the sample does not have representativeness due to the randomness of intermittence and manual sampling is avoided.
2. Real-time tracking analysis: the pH value of inlet water, the amount of inlet water, the pH value of outlet water and the pH value to be regulated and controlled are automatically tracked and recorded, the dosage of the required pH regulator is automatically analyzed in real time after data acquisition, the sensitivity is high, the error is small, and the feedback is advanced and timely.
3. Good impact load resistance: the water quantity and the pH value of inlet water are used as feed-forward values, the dosage of the pH regulator required by preliminary adjustment is adjusted according to the set dosage, preliminary large pH adjustment is realized in advance, water quantity fluctuation is effectively tracked, the timeliness of pH adjustment is realized, and the lag of the adjustment speed is avoided.
4. And (3) synergistic compound accurate regulation and control: and the pH value of the discharged water is taken as a feedforward value according to the preset pH value, and the micro-adjustment of the dosage of the pH regulator is carried out on the basis of the large adjustment of the water quantity, so that the pH value after the adjustment is in good stability and has no difference.
5. Periodic regulation and control, and timely stabilization: through multi-parameter calculation and a two-step cooperative composite regulation mechanism, the pH regulation speed is automatically analyzed, the pH value of the effluent is taken as feedforward, the pH value is regulated through two-step cooperative composite regulation, the pH value of the feedback is taken as the feedforward value again to carry out two-step cooperative calculation, the pH value is stably controlled in real time in cycles, and the stability of the quality of the water of the inlet water of the subsequent system is effectively ensured.
Drawings
In order to more clearly explain the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a system diagram of a pH composite cooperative control system based on feed-forward-feed-backward;
FIG. 2 is a diagram illustrating the operation effect of the power plant clarification tank system according to the embodiment of the invention on the real-time effluent pH within two days.
Wherein: 1-a water inlet parameter collecting unit; 2-a mixing unit; 3-a water outlet parameter collecting unit; 4-data acquisition and analysis regulation and control unit.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. are used for indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship which is usually arranged when the product of the present invention is used, the description is merely for convenience and simplicity, and the indication or suggestion that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, cannot be understood as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
Furthermore, the term "horizontal", if present, does not mean that the component is required to be absolutely horizontal, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the embodiments of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the pH composite cooperative regulation and control system based on feedforward-feedback of the present invention includes a water inlet parameter collection unit 1, a mixing unit 2, a water outlet parameter collection unit 3, and a data acquisition and analysis regulation and control unit 4. The water inlet parameter collecting unit 1 consists of a water inlet flowmeter, a water inlet online pH monitor, a sampling device and a matched pipeline valve. The mixing unit 2 is composed of a mixing element, a medicine storage device and a pipeline valve matched with medicine adding. The effluent parameter collecting unit 3 consists of an effluent online pH monitor, a sampling device and a matched pipeline valve. The data acquisition and analysis regulation and control unit 4 has the functions of feedforward data collection, feedback data collection, system feedforward regulation, feedback micro-regulation and the like.
The invention can carry out continuous automatic measurement and analysis, multi-parameter collection and analysis on the sample, accurately calculate the dosage of the needed pH regulator, and feed back and stably regulate and control the real-time pH value of the effluent, and comprises two steps of feed-forward regulation and feed-back fine regulation which are cooperated and combined.
The working process of the invention is as follows:
the mixing element 2 is installed on a water outlet pipeline of the front system, the inner diameter of the pipeline is D, the position of a sampling port is required to be more than or equal to 10D away from the dosing point of the pH regulator, and sampling water automatically and continuously enters an online pH monitor to monitor the pH value of outlet water after real-time regulation. The real-time water inlet quantity Q and the water inlet pH value of the mixing unit 2 are automatically collected as feed-forward data and enter a data acquisition and analysis regulation and control unit 4, and the water inlet quantity Q and the set adding quantity C are used0The dosage of the pH regulator required by automatic proportional calculation is advanced to quickly realize feedforward regulation, effectively buffer water fluctuation, track water quantity change, reduce untimely regulation and reduce errors. The specific calculation formula is as follows:
wherein Q ispThe design flow of a dosing metering pump is shown, and L/h is shown; c0Representing the calculated dosage of the medicament, mg/L; q represents the designed treatment amount of wastewater, m3H; c represents the preparation concentration of the medicament when the medicament is added, and wt%; ρ represents the density in kg/L at the concentration of the formulation.
The inner diameter of a water outlet pipeline of the mixing unit 2 is D, the position of a sampling port requires a distance more than or equal to 10D from the dosing point of the pH regulator, sampled water enters an online pH monitor, data are collected and enter a data acquisition and analysis regulation and control unit 4, the pH value is a feedback value according to the preset pH value, the real-time pH value of the outlet water is a feedforward value, PID fine regulation is further carried out on the basis of large water quantity regulation and control, and the pH value after regulation and control is ensured to be in good stability. The specific formula is as follows:
wherein, mu(t)To output a feedback value, e(t)For inputting feed-forward values, KpIs a proportionality coefficient, TiTo integrate the time constant, TdIs the differential time constant. By adjusting the proportional, integral and differential coefficients of the PID, the regulation can be accelerated, the steady-state error can be eliminated, the tolerance can be improved, the variation of deviation can be predicted in advance, and the dynamic regulation performance of the system can be further improved.
The pH value is regulated and controlled in a two-step cooperative and composite mode through a feedforward regulation step and a feedback fine regulation step, the feedback pH value is taken as the feedforward value again to carry out two-step cooperative calculation, the pH value is stably controlled in real time in cycles, and the stability of the water quality of the inlet water of a subsequent system is effectively ensured. The system can also draw change curves of the pH value of the outlet water, the quantity of the inlet water and the pH value of the inlet water, and the upper limit and the lower limit of the pH value and the fluctuation range are used as judgment bases, so that the real-time performance, the accuracy and the stability of the operation of the pH regulation mechanism are known, and the normal operation of a subsequent system is ensured.
Examples
The embodiment is applied to a raw water pretreatment system of a power plant, the raw water pretreatment system adopts a lime coagulating sedimentation method, and the effluent water is subjected to pH adjustment by using concentrated sulfuric acid. The operation effect of obtaining the real-time effluent pH of the clarification tank system for two days is shown in figure 2. In summary, the feedforward-feedback based pH composite cooperative regulation and control method provided by the invention is designed and applied under the working conditions that the fluctuation range of the water volume to be treated by the raw water pretreatment system is large and frequent, the pH composite cooperative regulation and control system based on the feedforward-feedback is normal and stable in operation, the real-time effluent pH of the system is maintained at 8.1-8.5, the error degree is less than +/-5%, and the required accuracy of the set pH is met.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A pH composite cooperative regulation and control system based on feedforward-feedback is characterized by comprising:
the mixing unit (2) is arranged on a water outlet pipeline of the front system, a water inlet parameter collecting unit (1) is arranged at a water inlet of the mixing unit (2), and a water outlet parameter collecting unit (3) is arranged at a water outlet;
the water inlet parameter collecting unit (1), the water inlet parameter collecting unit (1) is used for collecting the real-time water inlet amount and the water inlet pH value of the inlet water of the mixing unit (2), and sending the real-time water inlet amount and the water inlet pH value to the data acquisition and analysis regulation and control unit (4);
the water outlet parameter collecting unit (3) is used for collecting the pH value of the outlet water of the mixing unit (2) and sending the pH value of the outlet water to the data acquisition and analysis regulation and control unit (4);
and the data acquisition and analysis regulation and control unit (4) calculates a feedforward regulation parameter according to the real-time water inflow amount and the water inflow pH value, and calculates a feedback micro-regulation parameter according to the preset pH value and the water outflow pH value.
2. The pH composite cooperative regulation and control system based on feedforward-feedback as claimed in claim 1, wherein the water inlet parameter collecting unit (1) comprises a water inlet flow meter, a water inlet on-line pH monitor, a water inlet sampling device and a matching pipeline valve; the data output ends of the water inlet flow meter and the water inlet online pH monitor are connected with a data acquisition and analysis regulation and control unit (4).
3. The feedforward-feedback-based pH composite cooperative regulation and control system according to claim 2, wherein the effluent parameter collecting unit (3) comprises an effluent online pH monitor, an effluent sampling device and a matched pipeline valve; the data output end of the effluent online pH monitor is connected with the data acquisition and analysis regulation and control unit (4).
4. A feedforward-feedback-based pH composite cooperative control system according to claim 3, wherein the inner diameter of the pipeline of the mixing element (2) is D, and the distance between the sampling ports of the inflow sampling device and the outflow sampling device is not less than 10D from the pH regulator dosing point of the mixing element (2).
5. The pH composite cooperative regulation and control system based on feedforward-feedback according to claim 1, wherein the mixing unit (2) comprises a mixing element, a drug storage device and a pipeline valve matched with dosing; the medicine storage device is internally provided with a pH regulator, a medicine feeding point is arranged on a water outlet pipeline of the front system, a mixing element is arranged on the medicine feeding point and connected with the medicine storage device through a pipeline, and an electric control valve is arranged on the pipeline and connected with a data acquisition and analysis regulation and control unit (4).
6. A pH composite cooperative regulation and control system based on feedforward-feedback according to claim 5, characterized in that the data acquisition and analysis regulation and control unit (4) comprises a storage module, an operation module and a data transmission module, wherein the operation module transmits the calculated feedforward regulation parameter and the calculated feedback fine regulation parameter to the mixing unit (2), controls the opening of the electric control valve, and adjusts the addition amount of the pH regulator.
7. The pH composite cooperative regulation and control system based on feedforward-feedback as claimed in claim 6, wherein the data sending module is connected to a terminal device, and is configured to output change curve information of the pH value of the outlet water, the amount of the inlet water, and the pH value of the inlet water.
8. A pH composite cooperative regulation and control method based on feedforward-feedback is characterized by comprising the following steps:
the real-time water inlet amount and the water inlet pH value of the acquisition mixing unit (2) are used as feed-forward data and sent to the data acquisition and analysis regulation and control unit (4); the data acquisition and analysis regulation and control unit (4) calculates the dosage of the needed pH regulator according to the water inflow and the set dosage, and sends the dosage to the mixing unit (2) as a feedforward regulation parameter;
collecting the pH value of the effluent of the mixing unit (2), and sending the pH value of the effluent to a data collecting and analyzing regulation and control unit (4); the data acquisition and analysis regulation and control unit (4) calculates feedback fine regulation parameters by taking a preset pH value as a feedback value and taking a water outlet pH value as a feed forward value and sends the feedback fine regulation parameters to the mixing unit (2);
the mixing unit (2) carries out cooperative composite regulation and control on the pH value according to the feedforward regulation parameters and the feedback fine regulation parameters, and carries out two-step cooperative calculation by taking the pH value of the outlet water as the feedforward value again, and regulates and controls the pH value repeatedly to regulate the quality of the inlet water of a subsequent system.
9. A feedforward-feedback-based pH composite cooperative control method according to claim 1, wherein the feedforward adjustment parameter is calculated according to the following formula:
wherein Q ispThe design flow of a dosing metering pump is shown, and L/h is shown; c0Representing the calculated dosage of the medicament, mg/L; q represents the designed treatment amount of wastewater, m3H; c represents the preparation concentration,% (wt) when the medicament is added; ρ represents the density in kg/L at the concentration of the formulation.
10. A feed-forward-feed-backward based pH composite cooperative control method according to claim 1, wherein the feed-backward micro-adjustment is calculated according to the following formula:
wherein, mu(t)To output a feedback value, e(t)For inputting feed-forward values, KpIs a proportionality coefficient, TiTo integrate the time constant, TdIs the differential time constant.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113998767A (en) * | 2021-10-28 | 2022-02-01 | 重庆文理学院 | Electrocatalysis pH value processing system based on automatic control |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113998767A (en) * | 2021-10-28 | 2022-02-01 | 重庆文理学院 | Electrocatalysis pH value processing system based on automatic control |
| CN113998767B (en) * | 2021-10-28 | 2023-09-15 | 重庆文理学院 | Electrocatalytic pH value treatment system based on automatic control |
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