CN114249424A - Multi-stage AO pool aeration rate control method and system - Google Patents
Multi-stage AO pool aeration rate control method and system Download PDFInfo
- Publication number
- CN114249424A CN114249424A CN202111597108.XA CN202111597108A CN114249424A CN 114249424 A CN114249424 A CN 114249424A CN 202111597108 A CN202111597108 A CN 202111597108A CN 114249424 A CN114249424 A CN 114249424A
- Authority
- CN
- China
- Prior art keywords
- aeration
- controller
- dissolved oxygen
- set value
- value
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000005273 aeration Methods 0.000 title claims abstract description 153
- 238000000034 method Methods 0.000 title claims abstract description 42
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 96
- 239000001301 oxygen Substances 0.000 claims abstract description 96
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 96
- 230000001105 regulatory effect Effects 0.000 claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 230000001276 controlling effect Effects 0.000 claims abstract description 13
- 238000005259 measurement Methods 0.000 claims description 20
- 238000004364 calculation method Methods 0.000 claims description 12
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims description 8
- 238000012905 input function Methods 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 5
- 230000008569 process Effects 0.000 description 11
- 238000010586 diagram Methods 0.000 description 7
- 230000008859 change Effects 0.000 description 4
- 230000004044 response Effects 0.000 description 3
- 239000010865 sewage Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F7/00—Aeration of stretches of water
-
- 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
- C02F2209/38—Gas flow rate
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Biodiversity & Conservation Biology (AREA)
- Microbiology (AREA)
- Activated Sludge Processes (AREA)
- Feedback Control In General (AREA)
Abstract
The invention discloses a method and a system for controlling aeration rate of a multi-stage AO pool, wherein the method comprises the following steps: calculating the dissolved oxygen set value of each aerobic zone of the AO pool according to each parameter measured value of the main water inlet of the multi-stage AO pool; inputting the dissolved oxygen set value and the dissolved oxygen measured value into a dissolved oxygen controller to obtain an aeration rate set value of an aerobic zone; inputting the aeration quantity set value and the aeration quantity measured value of the aerobic zone into an aeration quantity controller to obtain the opening set value of an aeration regulating valve of the aerobic zone and control the aeration regulating valve; summing aeration setting values of aerobic zones of a plurality of AO pools, calculating by a first function to obtain a total air volume setting value, and calculating a difference value between the total air volume setting value and a total air volume measured value by a second function to generate an air volume feedforward signal; the output of the wind pressure controller is superposed and summed with the wind volume feedforward signal to obtain a set value of the frequency converter of the fan, and the operating frequency of the frequency converter of the aeration fan is controlled.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a method and a system for controlling aeration quantity of a multi-stage AO pool.
Background
At present, a plurality of multi-stage AO pools are mostly connected in parallel for sewage treatment in a sewage treatment plant, a plurality of aerobic areas are arranged in each AO pool for aeration, and a total water inlet is provided with a chemical oxygen demand measuring COD and an ammonia nitrogen measuring NH3-N, setting flow measurements and temperature measurements T at each AO-cell water inlet, and setting dissolved oxygen measurements at each aerobic zone of the AO-cell. Pressure measurement and flow measurement are arranged on an outlet aeration main pipe of the variable-frequency aeration fan, flow measurement is arranged on each aeration branch pipe, and an aeration regulating valve is arranged on each branch pipe. The aeration fan adopts frequency conversion control.
The existing control scheme is that an operator sets a total air volume set value for the variable-frequency aeration fan, a PI controller controls a frequency converter, and the air volume of an aeration main pipe is adjusted in real time; the aeration regulating valve adopts manual regulation.
In the prior art, for an aeration regulating valve, because the dissolved oxygen regulation in an aerobic zone is lagged greatly, influence factors are more, and an opening value mode of the regulating valve is set by adopting a manual mode of an operator, the working intensity of the operator is high, electric energy is wasted, and the effect is poor; the air volume of the aeration fan and the four aeration branch pipes is not well matched, and the oscillation or overshoot phenomenon is easy to occur.
Disclosure of Invention
The invention aims to provide a method and a system for controlling aeration quantity of a multi-stage AO pool, and aims to solve the problems of large dissolved oxygen lag and poor matching of a fan frequency converter and four regulating valves.
The invention provides a method for controlling aeration quantity of a multi-stage AO pool, which comprises the following steps:
s1, calculating to obtain dissolved oxygen set values of aerobic zones of the multi-stage AO pool according to parameter measurement values of a main water inlet of the AO pool; inputting the dissolved oxygen set value and the dissolved oxygen measured value into a dissolved oxygen controller to obtain an aeration rate set value of the aerobic zone;
s2, inputting the aeration quantity set value and the aeration quantity measured value of each aerobic zone into an aeration quantity controller to obtain the opening degree set value of an aeration regulating valve of each aerobic zone and control the corresponding aeration regulating valve;
s3, summing aeration setting values of aerobic zones of a plurality of AO pools, calculating by a first function to obtain a total air volume setting value, and calculating a difference value between the total air volume setting value and a total air volume measured value by a second function to generate an air volume feedforward signal;
and S4, superposing and summing the output of the air pressure controller and the air volume feedforward signal to obtain a set value of the frequency converter of the fan, and controlling the operating frequency of the frequency converter of the aeration fan.
The invention provides a multi-stage AO pool aeration rate control system, which comprises:
an aeration rate set value calculation module: the system is used for calculating and obtaining dissolved oxygen set values of aerobic zones of the AO pool according to parameter measured values of a main water inlet of the multi-stage AO pool, and obtaining aeration rate set values of the aerobic zones by inputting the dissolved oxygen set values and the dissolved oxygen measured values into a dissolved oxygen controller;
adjusting valve opening degree adjusting module: the aeration control valve is used for adjusting the corresponding aeration control valve according to the opening set value of the aeration control valve of the aerobic zone obtained by inputting the aeration set value and the aeration measured value into the aeration controller;
air volume feedforward signal calculation module: the system is used for summing aeration setting values of aerobic areas of a plurality of AO pools and calculating a total air volume setting value through a first function; calculating the difference value between the total air volume set value and the total air volume measured value through a second function to generate an air volume feedforward signal;
frequency converter frequency regulation module: and the control circuit is used for adjusting the operating frequency of the aeration fan frequency converter according to a fan frequency converter set value obtained by superposing and summing the output of the wind pressure controller and the wind volume feedforward signal.
By adopting the embodiment of the invention, the aeration regulating valve and the aeration fan are integrated by introducing the air volume feedforward, so that the output of the frequency converter of the aeration fan can be increased or reduced in advance under the condition of sudden change of the air volume demand, and the response speed is increased.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a flow chart of a multi-stage AO pool aeration amount control method according to an embodiment of the present invention;
FIG. 2 is a schematic view of a multi-stage AO pool aeration system and stations according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a function image of a first function Y ═ F1(X) according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a function image of a second function Y ═ F2(X) according to an embodiment of the present invention;
FIG. 5 is a graphical representation of the dissolved oxygen measurement DO versus the dissolved oxygen setpoint DOset over time for an embodiment of the present invention;
FIG. 6 is a graphical illustration of the control output of the dissolved oxygen controller over time in an embodiment of the present invention;
FIG. 7 is a schematic diagram of a multi-stage AO cell aeration control system of an embodiment of the present invention;
FIG. 8 is a block diagram of a multi-stage AO cell aeration control system according to an embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present 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.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise. Furthermore, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be 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 in specific cases to those skilled in the art.
Method embodiment
According to an embodiment of the present invention, a multi-stage AO pool aeration rate control method is provided, fig. 1 is a flowchart of the multi-stage AO pool aeration rate control method according to the embodiment of the present invention, fig. 2 is a schematic diagram of a multi-stage AO pool aeration system and a measurement point according to the embodiment of the present invention, the control method proposed in the embodiment of the present invention is implemented based on the system and the measurement point layout diagram shown in fig. 2, and as shown in fig. 1 and fig. 2, the multi-stage AO pool aeration rate control method according to the embodiment of the present invention specifically includes:
s1, calculating to obtain dissolved oxygen set values of aerobic zones of the multi-stage AO pool according to parameter measurement values of a main water inlet of the AO pool; and inputting the dissolved oxygen set value and the dissolved oxygen measured value into a dissolved oxygen controller to obtain an aeration rate set value of the aerobic zone.
Specifically, as shown in fig. 2, a chemical oxygen demand measuring point COD and an ammonia nitrogen measuring point NH are arranged at the total water inlet3N, setting AO pool water inlet flow measuring points Q5-Q6 and temperature measuring points T1-T2 on each AO pool water inlet pipeline, and setting dissolved oxygen measuring points DO 1-DO 4 in each aerobic zone of the AO pool; arranging a variable-frequency aeration fan F1, arranging a pressure measuring point P1 and a flow measuring point Q7 on an aeration main pipe at the outlet of the variable-frequency aeration fan, arranging flow measuring points Q1-Q4 on each aeration branch pipe, and arranging aeration regulating valves V1-V4 on each branch pipe; the aeration fan F1 adopts frequency conversion control.
The total Chemical Oxygen Demand (COD) of the inflow water and the total ammonia Nitrogen (NH) of the inflow water are obtained according to the arranged measuring points3N, the water inlet flow Q5 of the first AO pool and the water inlet temperature T1 of the first AO pool, and a dissolved oxygen set value DOset1 of the first aerobic zone and a dissolved oxygen set value DOset2 of the second aerobic zone of the first AO pool are calculated.
Aiming at a first aerobic zone of a first AO pool, a PI controller with sectional input is adopted as a dissolved oxygen controller, a dissolved oxygen set value DOset1 is a set value, a dissolved oxygen measured value DO1 is a process value, the control output of the dissolved oxygen controller after PID calculation is used as an aeration amount set value Qset1, and the control output range is 0-100%.
And S2, inputting the aeration quantity set value and the aeration quantity measured value of the aerobic zone into an aeration quantity controller for each aerobic zone to obtain the opening degree set value of an aeration regulating valve of the aerobic zone, and controlling the corresponding aeration regulating valve.
Specifically, for the first aerobic zone of the first AO tank, the aeration controller adopts a PI controller, the set value of the aeration setting value Qset1 is used as the process value, the measured value of the aeration Q1 is used as the process value, the control output of the aeration controller after PID calculation is used as the control output of the opening setting value Vset1 of the aeration regulating valve, the range is 0-100%, and the control output is sent to the aeration regulating valve V1 to control the opening.
The aeration regulating valve adopts double closed loop cascade control, an aeration controller is used as an inner ring, a dissolved oxygen controller is used as an outer ring, and the output of the outer ring is used as the input of the inner ring.
The method for controlling the second aerobic zone of the first AO-pool is the same as the method for controlling the first aerobic zone of the first AO-pool, and the method for controlling the second AO-pool is the same as the method for controlling the first AO-pool.
And S3, summing aeration quantity set values of aerobic zones of a plurality of AO pools, calculating by a first function to obtain a total air quantity set value, and calculating a difference value between the total air quantity set value and the total air quantity measured value by a second function to generate an air quantity feedforward signal.
Specifically, after steps S1 and S2, aeration setting values Qset1 to Qset4 of 4 aerobic zones are obtained in total, the Qset1 to Qset4 are summed and then calculated by a first function Y ═ F1(X) to obtain a total air volume setting value TQset, fig. 3 is a function image of the first function Y ═ F1(X), the sum of the aeration setting values of the 4 aerobic zones is taken as an independent variable X, the total air volume setting value is taken as a dependent variable Y, and the summed values of the aeration setting values Qset1 to Qset4 of the 4 aerobic zones correspond to the total air volume setting value TQset obtained by fig. 3;
after the difference between the total air volume set value TQset and the total air volume actual measurement value Q7 is obtained, an air volume feedforward signal is obtained by calculating a second function Y equal to F2(X), fig. 4 is a function image of the second function Y equal to F2(X), and the air volume feedforward signal is obtained by using a value obtained by calculating the difference between the total air volume set value TQset and the total air volume actual measurement value Q7 as an independent variable X, a dependent variable Y, and a total air volume set value TQset and the total air volume actual measurement value Q7 as a feedforward signal of the wind pressure controller, in accordance with fig. 4.
And S4, superposing and summing the output of the air pressure controller and the air volume feedforward signal to obtain a set value of the frequency converter of the fan, and controlling the operating frequency of the frequency converter of the aeration fan.
Specifically, the wind pressure controller adopts a single closed loop PI controller, a wind pressure set value Pset and a wind pressure measured value P1 are input, the control output range is 0-100%, the control output of the wind pressure controller is summed with a wind volume feedforward signal to obtain an aeration fan frequency converter set value F1set, the aeration fan frequency converter set value F1set is sent to the aeration fan frequency converter to control the operation frequency of the aeration fan frequency converter, and the wind pressure set value Pset of the wind pressure controller is manually set by an operator in the actual control process.
The air volume feedforward is adopted as the supplement of the air pressure control, so that the output of the frequency converter of the aeration fan can be increased or reduced in advance under the condition of sudden change of the air volume demand, and the response speed is increased.
Further, the dissolved oxygen controller is a PI controller with a segment input function, that is, a segment input function is added on the basis of a general PI controller, and the detailed embodiment is as follows: the set value of the dissolved oxygen is segmented according to proportion and divided into a holding area, a proportion input area and a proportion integral input area, and each area corresponds to different control algorithms.
In the following description, one of the dissolved oxygen controllers is taken as an example, fig. 5 is a graph of a dissolved oxygen measurement value DO and a dissolved oxygen set value DOset changing with time in the embodiment of the present invention, and for a more clear description of the control scheme, the dissolved oxygen set value DOset is kept unchanged, and 5 control regions are divided into "a holding region", "a proportional input region", "a proportional integral input region", "a proportional input region", and "a holding region" in this order according to four shift positions of DOset, such as 80%, 95%, 105%, and 120. When the dissolved oxygen set value is in the holding area, the control output of the dissolved oxygen controller keeps the current value, when the dissolved oxygen set value is in the proportional input area, the dissolved oxygen controller adopts proportional (P) control, and when the dissolved oxygen set value is in the proportional integral input area, the dissolved oxygen controller adopts proportional integral (P I) control.
FIG. 6 is a graph showing the control output of the dissolved oxygen controller according to the embodiment of the present invention as a function of time, from which:
at the initial time, when the dissolved oxygen measurement DO is less than DOset x 80%, the controller DC enters a "holding zone" where the dissolved oxygen controller DC output is constant, with a default initial value of 80%.
Along with the beginning of aeration, the measured value DO of dissolved oxygen gradually rises, when DO is more than DOset x 80%, the controller DC enters a proportional input area, at the moment, the dissolved oxygen controller DC inputs proportional (P) control, and the control output is a deviation value multiplied by a proportional coefficient. As the dissolved oxygen measurement value DO continues to rise, the control output of the dissolved oxygen controller DC gradually falls, i.e., the aeration amount set value Qset gradually falls.
And (3) with the continuous aeration, the measured value DO of the dissolved oxygen continues to rise, when the DO is greater than DOset x 95%, the proportional-integral input area enters, at the moment, the dissolved oxygen controller DC inputs proportional-integral (PI) control, and the control output increases the integral of the deviation to the time on the basis of the proportional control.
Due to the hysteresis of the dissolved oxygen DO, although the aeration amount has decreased, the dissolved oxygen measurement value DO still rises, and when DO is larger than DOset x 105%, the "proportional input zone" is entered, at which time the dissolved oxygen controller DC re-inputs the proportional (P) control.
The dissolved oxygen measurement value DO continues to rise, and when the DO is greater than DOset x 120%, the method enters a 'holding zone', the DC output of the dissolved oxygen controller is constant, and the current value is maintained unchanged.
Along with the long-time low position of the aeration quantity, the dissolved oxygen measurement value DO is gradually switched into a descending process, the switching in the descending process is the same as that in an ascending process, namely, the dissolved oxygen controller DC is switched among a holding area, a proportional input area and a proportional integral input area according to the area where the dissolved oxygen measurement value DO is located.
By the control mode, the controller DC can be kept when the deviation is very large (more than 20% of the set value), and the fluctuation of the system is avoided; when the deviation is general (5-20% of the set value), the controller is only put into proportion (P) control, so that overlarge integral influence caused by overlong time is avoided; when the deviation is very small (within 5% of the set value), the controller is put into Proportional Integral (PI) control, fine adjustment is carried out, and errors are eliminated.
By adopting the embodiment of the invention, the double closed-loop cascade control is arranged for each aeration regulating valve, which is beneficial to improving the control quality; aiming at the large hysteresis of the dissolved oxygen, the dissolved oxygen controller is subjected to a segmented input function, and the stability and the accuracy of control are considered; the aeration fan adopts the closed-loop control of the air pressure, so that the condition of frequent change of the output of the aeration fan is reduced as much as possible; by introducing air quantity feedforward, the aeration regulating valve and the aeration fan are integrated, the output of the frequency converter of the aeration fan can be increased or reduced in advance under the condition of sudden change of air quantity demand, and the response speed is increased.
System embodiment
According to an embodiment of the present invention, there is provided a multi-stage AO tank aeration amount control system, fig. 7 is a schematic view of the multi-stage AO tank aeration amount control system according to the embodiment of the present invention, and as shown in fig. 7, the multi-stage AO tank aeration amount control system according to the embodiment of the present invention specifically includes:
aeration rate set value calculation module 70: the system is used for calculating and obtaining dissolved oxygen set values of aerobic zones of the AO pool according to parameter measured values of a main water inlet of the multi-stage AO pool, and obtaining aeration rate set values of the aerobic zones by inputting the dissolved oxygen set values and the dissolved oxygen measured values into a dissolved oxygen controller;
the regulating valve opening degree regulating module 72: the aeration control valve is used for adjusting the corresponding aeration control valve according to the opening set value of the aeration control valve of the aerobic zone obtained by inputting the aeration set value and the aeration measured value into the aeration controller;
air volume feedforward signal calculation module 74: the system is used for summing aeration setting values of aerobic areas of a plurality of AO pools and calculating a total air volume setting value through a first function; calculating the difference value between the total air volume set value and the total air volume measured value through a second function to generate an air volume feedforward signal;
frequency converter frequency adjustment module 76: and the control circuit is used for adjusting the operating frequency of the aeration fan frequency converter according to a fan frequency converter set value obtained by superposing and summing the output of the wind pressure controller and the wind volume feedforward signal.
Fig. 8 is a schematic diagram of a multi-stage AO pool aeration amount control system according to an embodiment of the present invention, and as shown in fig. 8, the working process of the multi-stage AO pool aeration amount control system according to the embodiment of the present invention specifically includes:
the total Chemical Oxygen Demand (COD) of the inflow water and the total ammonia Nitrogen (NH) of the inflow water are obtained according to the arranged measuring points3N, the water inlet flow Q5 of the first AO pool and the water inlet temperature T1 of the first AO pool, and the dissolved oxygen of the first aerobic zone of the first AO pool is calculatedSet point DOset1, and second aerobic zone dissolved oxygen set point DOset 2; aiming at a first aerobic zone of a first AO pool, a PI controller which is put in a segmented mode is adopted as a dissolved oxygen controller DC1, a dissolved oxygen set value DOset1 is a set value, a dissolved oxygen measured value DO1 is a process value, the control output of the dissolved oxygen controller DC1 after PID calculation is used as an aeration amount set value Qset1, and the control output range is 0-100%; the aeration quantity controller QC1 adopts a PI controller, takes an aeration quantity set value Qset1 as a set value thereof, takes an aeration quantity measured value Q1 as a process value, and sends the control output of the aeration quantity controller QC1 after PID calculation as the control output of an opening set value Vset1 of an aeration regulating valve, wherein the control output ranges from 0% to 100%, and the control output is sent to the aeration regulating valve V1 to control the opening; the control method of the second aerobic zone of the first AO pool is the same as that of the first aerobic zone of the first AO pool, and the control method of the second AO pool is the same as that of the first AO pool;
aeration setting values Qset 1-Qset 4 of 4 aerobic areas of two AO pools in the multi-stage AO pool aeration control system are summed, and then are calculated by a first function Y which is F1(X) to obtain a total air volume setting value TQset, wherein a figure 3 shows a function image of the first function Y which is F1(X), and the summed values of the aeration setting values Qset 1-Qset 4 of the 4 aerobic areas correspond to a figure 3 to obtain a total air volume setting value TQset;
after the difference between the total air volume set value TQset and the total air volume measured value Q7 is obtained, an air volume feedforward signal is obtained after calculation of a function Y of F2(X), fig. 4 is a function image of a first function Y of F2(X), and the air volume feedforward signal is obtained by a value obtained after the difference between the total air volume set value TQset and the total air volume measured value Q7 corresponding to fig. 4 and is used as a feedforward signal of the wind pressure controller;
the method comprises the steps of adopting a wind pressure controller of a single closed loop PI controller, taking a wind pressure set value Pset and a wind pressure measured value P1 as input, controlling the output range to be 0-100%, summing the control output of the wind pressure controller and a wind volume feedforward signal to obtain an aeration fan frequency converter set value F1set, sending the aeration fan frequency converter set value F1set to an aeration fan frequency converter to control the operation frequency of the aeration fan frequency converter, wherein the wind pressure set value Pset of the wind pressure controller is manually set by an operator in the actual control process.
The embodiment of the present invention is a system embodiment corresponding to the above method embodiment, and specific operations of each module may be understood with reference to the description of the method embodiment, which is not described herein again.
It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A multi-stage AO pool aeration rate control method is characterized by comprising the following steps:
s1, calculating to obtain dissolved oxygen set values of aerobic zones of the multi-stage AO pool according to parameter measurement values of a main water inlet of the AO pool; inputting the dissolved oxygen set value and the dissolved oxygen measured value into a dissolved oxygen controller to obtain an aeration rate set value of the aerobic zone;
s2, inputting the aeration quantity set value and the aeration quantity measured value of each aerobic zone into an aeration quantity controller to obtain the opening degree set value of an aeration regulating valve of each aerobic zone and control the corresponding aeration regulating valve;
s3, summing aeration setting values of aerobic zones of a plurality of AO pools, calculating by a first function to obtain a total air volume setting value, and calculating a difference value between the total air volume setting value and a total air volume measured value by a second function to generate an air volume feedforward signal;
and S4, superposing and summing the output of the air pressure controller and the air volume feedforward signal to obtain a set value of the frequency converter of the fan, and controlling the operating frequency of the frequency converter of the aeration fan.
2. The method according to claim 1, wherein the parameters include total influent Chemical Oxygen Demand (COD), total influent ammonia Nitrogen (NH)3N, AO pool influent flow rate and AO pool influent temperature.
3. The method as claimed in claim 1, wherein the aeration regulating valve control method is: and double closed loop cascade control is adopted, the aeration quantity controller is used as an inner ring, and the dissolved oxygen controller is used as an outer ring.
4. The method of claim 1, wherein the aeration volume controller is a PI controller.
5. The method according to claim 1, wherein the dissolved oxygen controller is a PI controller with a segment input function.
6. The method of claim 5, wherein the step-wise input of the dissolved oxygen controller is as follows: the dissolved oxygen set value is segmented according to proportion and is respectively divided into a holding area, a proportion input area and a proportion integral input area, when the dissolved oxygen set value is in the holding area, the control output of the dissolved oxygen controller keeps the current value, when the dissolved oxygen set value is in the proportion input area, the dissolved oxygen controller adopts proportion control, and when the dissolved oxygen set value is in the proportion integral input area, the dissolved oxygen controller adopts proportion integral control.
7. The method of claim 1, wherein the output of the wind pressure controller is obtained by: and inputting a wind pressure set value and a wind pressure measured value into the wind pressure controller, and obtaining the output of the wind pressure controller after PID calculation, wherein the wind pressure controller is a single closed loop PI controller.
8. A multi-stage AO pond aeration rate control system characterized by comprising:
an aeration rate set value calculation module: the system is used for calculating and obtaining dissolved oxygen set values of aerobic zones of the AO pool according to parameter measured values of a main water inlet of the multi-stage AO pool, and obtaining aeration rate set values of the aerobic zones by inputting the dissolved oxygen set values and the dissolved oxygen measured values into a dissolved oxygen controller;
adjusting valve opening degree adjusting module: the aeration control valve is used for adjusting the corresponding aeration control valve according to the opening set value of the aeration control valve of the aerobic zone obtained by inputting the aeration set value and the aeration measured value into the aeration controller;
air volume feedforward signal calculation module: the system is used for summing aeration setting values of aerobic areas of a plurality of AO pools and calculating a total air volume setting value through a first function; calculating the difference value between the total air volume set value and the total air volume measured value through a second function to generate an air volume feedforward signal;
frequency converter frequency regulation module: and the control circuit is used for adjusting the operating frequency of the aeration fan frequency converter according to a fan frequency converter set value obtained by superposing and summing the output of the wind pressure controller and the wind volume feedforward signal.
9. The system of claim 8, wherein the aeration control valve is controlled in a double closed loop cascade with the aeration controller as an inner loop and the dissolved oxygen controller as an outer loop.
10. The system of claim 8, wherein the aeration volume controller is a PI controller, the dissolved oxygen controller is a PI controller with a segmented input function, and the wind pressure controller is a single closed loop PI controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111597108.XA CN114249424A (en) | 2021-12-24 | 2021-12-24 | Multi-stage AO pool aeration rate control method and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111597108.XA CN114249424A (en) | 2021-12-24 | 2021-12-24 | Multi-stage AO pool aeration rate control method and system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114249424A true CN114249424A (en) | 2022-03-29 |
Family
ID=80797368
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111597108.XA Pending CN114249424A (en) | 2021-12-24 | 2021-12-24 | Multi-stage AO pool aeration rate control method and system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114249424A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115448444A (en) * | 2022-10-14 | 2022-12-09 | 一汽丰田汽车有限公司 | Aeration system, aeration control method and device thereof and storage medium |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101012088A (en) * | 2007-02-01 | 2007-08-08 | 北京工业大学 | Low-oxygen aeration control device and method for subsection water inflow A/O biological denitrification technique |
| CN202625944U (en) * | 2012-06-05 | 2012-12-26 | 派石新能源技术开发(北京)有限公司 | Energy-saving variable-frequency regulating accurate aerating system |
| CN102863074A (en) * | 2011-07-06 | 2013-01-09 | 北京源汇远科技有限公司 | Intelligent control method of blast aeration system of municipal sewage plant |
| JP2014133202A (en) * | 2013-01-10 | 2014-07-24 | Nishihara Environment Co Ltd | Effluent treatment apparatus, air blast volume controller used for the same, and effluent treatment method |
| CN104478076A (en) * | 2014-12-12 | 2015-04-01 | 连际高新电气(上海)有限公司 | Digital micro-aerobic energy-saving aerating apparatus and aerating process |
| JP2018187587A (en) * | 2017-05-10 | 2018-11-29 | 株式会社東芝 | Aeration air volume control apparatus and aeration air volume control method |
| CN210795894U (en) * | 2019-10-17 | 2020-06-19 | 金科环境股份有限公司 | Full-automatic aeration energy-saving control system |
| CN111847628A (en) * | 2020-08-26 | 2020-10-30 | 中持水务股份有限公司 | Water treatment control system and method |
-
2021
- 2021-12-24 CN CN202111597108.XA patent/CN114249424A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101012088A (en) * | 2007-02-01 | 2007-08-08 | 北京工业大学 | Low-oxygen aeration control device and method for subsection water inflow A/O biological denitrification technique |
| CN102863074A (en) * | 2011-07-06 | 2013-01-09 | 北京源汇远科技有限公司 | Intelligent control method of blast aeration system of municipal sewage plant |
| CN202625944U (en) * | 2012-06-05 | 2012-12-26 | 派石新能源技术开发(北京)有限公司 | Energy-saving variable-frequency regulating accurate aerating system |
| JP2014133202A (en) * | 2013-01-10 | 2014-07-24 | Nishihara Environment Co Ltd | Effluent treatment apparatus, air blast volume controller used for the same, and effluent treatment method |
| CN104478076A (en) * | 2014-12-12 | 2015-04-01 | 连际高新电气(上海)有限公司 | Digital micro-aerobic energy-saving aerating apparatus and aerating process |
| JP2018187587A (en) * | 2017-05-10 | 2018-11-29 | 株式会社東芝 | Aeration air volume control apparatus and aeration air volume control method |
| CN210795894U (en) * | 2019-10-17 | 2020-06-19 | 金科环境股份有限公司 | Full-automatic aeration energy-saving control system |
| CN111847628A (en) * | 2020-08-26 | 2020-10-30 | 中持水务股份有限公司 | Water treatment control system and method |
Non-Patent Citations (1)
| Title |
|---|
| 夏文辉;刘芬;周雹;: "污水处理厂曝气控制研究" * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115448444A (en) * | 2022-10-14 | 2022-12-09 | 一汽丰田汽车有限公司 | Aeration system, aeration control method and device thereof and storage medium |
| CN115448444B (en) * | 2022-10-14 | 2023-12-29 | 一汽丰田汽车有限公司 | Aeration system, aeration control method and device thereof and storage medium |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20230060683A1 (en) | Multi-channel alkaline hydrogen production system | |
| CN101020128A (en) | Multi-model dynamic matrix feeding amount control method for coagulation system in waterworks | |
| CN101587357A (en) | Temperature control method and temperature control system thereof | |
| CN102863074A (en) | Intelligent control method of blast aeration system of municipal sewage plant | |
| CN114249424A (en) | Multi-stage AO pool aeration rate control method and system | |
| CN113087077B (en) | Energy-saving and consumption-reducing control method for pressure type ultrafiltration membrane water purification system | |
| CN114059084A (en) | Electrolytic hydrogen production system and temperature control method and device thereof | |
| CN107555590A (en) | A kind of multi-point combination formula accurate aeration control method | |
| CN114920358B (en) | RBS intelligent control method for sewage plant | |
| CN116149401A (en) | System and method for controlling outlet temperature of heat exchanger of compressed air energy storage power station | |
| CN115110119A (en) | Temperature control method and device of hydrogen production system and hydrogen production system | |
| CN115011999A (en) | High-precision active pressure control method for alkaline water electrolytic cell | |
| CN112941540B (en) | Vanadium electrolyte production system and production method | |
| CN107544569B (en) | Control method for keeping constant liquid level of filtering state of V-shaped filter tank | |
| CN210951273U (en) | Automatic liquid level control system for deaerator of supercritical unit | |
| CN110104777B (en) | DO intelligent control method for sewage plant | |
| CN116576125A (en) | Cooling water flow control system and control method for parallel multiple circulating water pumps | |
| CN116083956A (en) | Electrolysis cell hydrogen production system and electrolysis cell temperature control method | |
| JP3894034B2 (en) | Concentration method of sludge | |
| CN113526692B (en) | Method and system for controlling dissolved oxygen content of biochemical tank | |
| CN108978795A (en) | A kind of graphitizing furnace furnace end electrode constant pressure water supply system | |
| CN110703592B (en) | PID (proportion integration differentiation) adjusting method and PID adjuster | |
| CN110937616B (en) | Intelligent setting system and method for alumina evaporation process | |
| CN113354069A (en) | MBR process accurate aeration control system and method | |
| CN221117647U (en) | Control system for hydrogen content in oxygen in low-load state of alkaline water electrolysis hydrogen production system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20220329 |