CN115253484A - Automatic control method of V-shaped filter device - Google Patents
Automatic control method of V-shaped filter device Download PDFInfo
- Publication number
- CN115253484A CN115253484A CN202210951493.1A CN202210951493A CN115253484A CN 115253484 A CN115253484 A CN 115253484A CN 202210951493 A CN202210951493 A CN 202210951493A CN 115253484 A CN115253484 A CN 115253484A
- Authority
- CN
- China
- Prior art keywords
- backwashing
- pump
- flow
- water
- load
- 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.)
- Granted
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D37/00—Processes of filtration
- B01D37/04—Controlling the filtration
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Centrifugal Separators (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The invention discloses an automatic control method of a V-shaped filter device, which dynamically analyzes parameters in a backwashing process, relates to the relationship between congestion rate and hydraulic load and backwashing period and time, and optimizes backwashing efficiency; time sequence cross backwashing of multiple filters is carried out, and the processing load of the filters is expanded from the software perspective; meanwhile, the method needs more backwashing water amount, and correspondingly provides a water distribution amount PID control method matched with the characteristics of the centrifugal pump. The quantitative and qualitative analysis of the invention analyzes the influence of the congestion rate and the hydraulic load on the parameters of the backwashing period and the backwashing time in the backwashing process. A corresponding control method is provided, and the backwashing efficiency is optimized; the multiple filters are subjected to sequential and cross backwashing, the treatment speed of the filter body is increased at the same time, the treatment capacity is increased, and the treatment load of the existing filter is expanded from the software perspective; meanwhile, a multi-pump PID control method which is matched with the characteristics of the centrifugal pump and balanced by taking the water distribution amount as an input parameter is provided, and the method has universality on similar working conditions of pump water supply.
Description
Technical Field
The invention relates to an automatic control method of a filter device, belongs to the technology of automatic control treatment of tail water, and particularly relates to an automatic control method of a V-shaped filter device.
Background
The V-shaped filter tank is a tail water treatment device commonly applied to water treatment production enterprises, the control core of the device is the sequential backwashing function of the filter tank, the device is applied to a matched monomer sequential logic method, is a mature mainstream process at present, and is good in field use effect.
At present, most of V-filter production treatment processes in factories are jointly completed by multi-cell combinations. The main flow control method is that each pool body is backwashed independently, and the backwashing is triggered according to the water loss instrument index or is performed in a time polling sequencing mode. During this time, all tank backwashing is unique, and the reason for this is to consider the capacity of the backwash water supply. On the other hand, the single pool is in the only sequence, and the common backwash pump and the mixed logic between time sequences when the multiple pools of backwashing are crossed do not need to be considered in the aspect of program design, so that the program difficulty is reduced.
The whole filtering backwashing flow is as follows: when the plugging state is reached (water loss meter feedback indicator), or when the polling time is reached, the backwashing sequence is started. (1) The water inlet valve is cut off and the liquid level is waited to be reduced. (2) When the liquid level drops below the drain valve, the rinse drain valve opens. (3) And when the liquid level continues to be reduced to the left and the right of the filtering surface 200, closing the water production valve, opening the water inlet valve, opening the air pump and the air valve and starting air washing. (4) After air washing for a minute, the steam washing was changed: the cleaning pump P1\ P2 is opened, and the cleaning valve is opened. (5) And after the steam washing is carried out for B minutes, closing the gas washing pump, the gas washing valve and the exhaust valve. And the washing pump P1 is turned off to perform the water washing. (6) And after washing for C minutes, closing the washing valve, closing the washing pump P2 and finishing washing. (7) Closing the washing drain valve in a delayed manner, and opening the water production valve. And entering a normal filtration process. I.e. the next cycle. Wherein, the air washing time A, the steam-water washing time B and the water washing time C are washing adjustment time parameters.
The backwashing flow of each tank body is completely consistent. And (4) performing backwashing sequencing large circulation of the multiple pools by manual triggering or program polling. Because only one tank body backwashing state can exist currently, a plurality of sequential data records and the backwashing water supply increment problem do not need to be considered in the polling queuing program design.
The existing V-shaped filter control scheme has the advantages of few parameters, easy operation, simple understanding and stable operation, but the defects are also obvious: 1. the backwashing time and the backwashing frequency in the conventional V-filter control are judged and triggered only by point feedback of a water loss instrument, and the conditions of the filter cloth congestion rate and the water volume load surge are not deeply analyzed and solved; 2. the single-tank only sequential backwashing functional design limits the water treatment capacity of the filter, is limited by the original design of the tank body and the space volume, and cannot be used in the face of a larger load working condition; 3. since backwash water supply only considers the unique water supply capacity of a single tank in the original design, the lack of hardware (backwash pump number) also limits the implementation of software retrofit schemes.
Disclosure of Invention
The invention aims to solve and make up the defects of the mainstream control scheme, optimize the backwashing process and improve the filtering backwashing capability. The filtering treatment load of the prior art is expanded by a low-cost control scheme of modifying software and adding a backwashing pump.
Aiming at the defects of the conventional V-filter mainstream control method, the invention designs a new control solution: dynamically analyzing parameters of the backwashing process, relating to the relation between the congestion rate and the hydraulic load and the backwashing period and time, and optimizing the backwashing efficiency; time sequence cross backwashing of multiple filters is carried out, and the processing load of the filters is expanded from the software perspective; meanwhile, the method needs more backwashing water amount, and correspondingly provides a water distribution amount PID control method matched with the characteristics of the centrifugal pump.
S1, filtering the influence of congestion rate R abnormity and water quantity mutation factors on backwashing time A \ B \ C and backwashing period T in a backwashing flow sequence;
abnormal congestion rate: r = dY/dt represents the congestion rate, Y is the water loss meter value, and t time. Detecting the current congestion rate R and the empirical characteristic value R in real time in a program t Comparing to obtain a difference value E t When E is = | R-Rt | t If more than a | Tt |, judging the current congestion is abnormal, wherein a is a set coefficient and is generally between 20% and 50% according to actual experience. When the congestion is abnormal, the backwashing time A \ B \ C is amplified, and the washing time is prolonged.
Water quantity mutation: when water quantity mutation occurs and the water flow rate of high load is F load, the parameter of washing interval period T between the pools is shortened in advance. By using a piecewise ratio method, when F>130% by weight of X, T =90% 0 (ii) a When F is present>160% by weight of X, T =80% 0 (ii) a When F is present>200% X, T =60% 0 .T 0 Is the empirical period at normal load.
S2, backwashing the multiple filter tanks and carrying out cross polling load management treatment;
when the multi-filter backwashing cross design is carried out, the sequence controllers U [ N ] are designed to correspond to the N filter bodies one by one. Therefore, under the condition that the large load period T is shortened, the process of performing cross backwashing treatment on two or even three tank bodies occurs, the water flow filtering speed is increased, and the load treatment capacity is improved.
S3, backwashing a water distribution PID control method corresponding to the large water amount and matched with the characteristics of the centrifugal pump;
when multiple pumps are put in, the multiple flow rate profile characteristics are superimposed over time. Avoid the superposition of pump characteristic dead zones for a smooth flow regulation effect, a segmented flow/frequency algorithm is used: (1) and determining the normal flow interval X dead zone interval Xd through a pump test. (2) When the target flow F modX = Xd, the flow control enters the dead zone inefficiency section L. When the division is completed, the flow control enters the normal high-efficiency section H. (3) A segmentation formula: n = F/(X + Xd), and n is the number of started pumps; when the low-efficiency area is judged, the previous starting pump is low-frequency; when the high-frequency area is judged, the former starting pump is high-frequency; and the pump is always switched to operate under the control of the PID. With the recursion, as the flow load increases, the working condition of low efficiency and high efficiency alternately appear; the pump starting number is increased, the high and low fixed frequency is adjusted by PID, and the operation is executed according to a recursion rule.
The automatic control solution of the V-shaped filter device designed by the invention has the following advantages: 1. and the influence of the congestion rate and the hydraulic load on the parameters of the backwashing period and the backwashing time in the backwashing process is analyzed through quantitative and qualitative analysis. A corresponding control method is provided, and the backwashing efficiency is optimized; 2. the multiple filters are subjected to sequential and crossed backwashing, so that the treatment speed of the filter body is increased at the same time, the treatment capacity is increased, and the treatment load of the conventional filter is expanded from the software perspective; 3. meanwhile, a multi-pump PID control method which is matched with the characteristics of the centrifugal pump and balanced by taking the water distribution amount as an input parameter is provided, and the method has universality on similar working conditions of pump water supply.
Drawings
FIG. 1 is a timing diagram of the Vfilter.
Fig. 2 is a timing diagram of the pump.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and examples.
The technical scheme adopted by the invention is an automatic control method of a V-shaped filter device, and the implementation process of the method is as follows:
1) The influence of detail factors on backwashing is considered in the flow sequence of the filtering backwashing.
1. Abnormal congestion rate: usually, the index for backwashing when the filter cloth is seriously polluted and blocked is the feedback Y value of the water loss instrument. Y (t) is a function of the fouling value over time, and the derivative dY/dt represents the congestion rate. During debugging, the dY/dt value of each point in the range of Y epsilon (0, 1.5) m can be recorded through production records. Under the normal condition, a filter cloth fouling and blocking curve can be determined as an empirical characteristic value T through about ten average recorded values t Reference is made to. Detecting the current congestion rate R and the empirical characteristic value R in real time in a program t Comparing to obtain a difference value E t When E is = | R-Rt | t If more than a | Tt |, judging the current congestion is abnormal, wherein a is a set coefficient and is generally between 20% and 50% according to actual experience. When the congestion is abnormal, the backwashing parameters A \ B \ C are amplified, and the washing time is prolonged.
2. Water quantity mutation: the filter cloth jam is a direct expression factor of the need of backwashing of the filter, and the sudden change of the water volume load is an indirect factor influencing the backwashing. The filtration process water flow rate is normally substantially within a steady range (0, X). However, when the pollution discharge load is high (pollution discharge in production and living or seasonal flooding), the water quantity changes suddenly for a period of time. At the moment, the backwashing law of the original conventional load has a large probability of not being matched with the processing capacity under the high load. At this time, the washing interval period T between the tanks should be shortened in advance according to the front-end water flow FAnd (4) counting. The program design adopts a segmentation ratio method, when F>130% by weight of X, T =90% 0 (ii) a When F is present>160% by weight of X, T =80% 0 (ii) a When F is present>200% X, T =60% 0 ，T 0 Is the experience period under normal load.
2) The backwashing cross polling treatment load processing capacity of the multiple filter tanks is improved;
the conventional backwashing of multiple filter tanks has uniqueness, namely only one filter tank enters a backwashing sequence in the large circulation sequencing of program design; such software designs typically employ a single sequence controller U. And the pointer is selected to be N, and when the pointer is selected to be the pool body h in a circulating mode (N = h), input and output parameters such as equipment variables and backwashing time corresponding to the pool h are related to the controller U and start triggering is carried out. And the controller U executes the sequence and outputs the pointer pool body control equipment. FIG. 1 is a timing diagram of the Vfilter.
When the multi-filter backwashing cross design is carried out, the sequence controllers U [ N ] are designed to correspond to the N filter bodies one by one. Circular sequencing between the pool bodies still exists, but each pool body has a separate controller, and the starting of all the processes is not conflicted. Therefore, under the condition that the large load period T is shortened, the process of performing cross backwashing treatment on two or even three tank bodies occurs, the water flow filtering speed is increased, and the load treatment capacity is improved.
3) A water distribution PID control method which is corresponding to the large water quantity backwashing and is matched with the characteristics of the centrifugal pump;
the conventional water supply backwashing control only uses one pump for water supply (one is used and one is prepared), and a flow PID controller is used for backwashing water supply. And when the multi-pool backwashing is carried out, the constant flow control of a plurality of pumps is carried out according to the water quantity requirement.
According to characteristics of centrifugal pump
Q is flow, n is rotation speed, s g S is friction resistance, H 0 For water supply height, H b The head at the current rotational speed. It can be concluded that the flow rate and the rotational speed (frequency) follow a hyperbolic function. And a minimum frequency limit value f exists 0 At f 0 Below, the pump flow is 0; when passing over f 0 In the meantime, the water supply of the water pump has a sudden step, and the pump flow has a dead zone. The constant flow of multi-pump water supply needs to avoid dead zones, so that the control of flow intervals near the dead zones needs to be controlled in a segmented mode, and particularly the PID regulation in the range is easy to overshoot. A single pump PID is designed all the time, and other pumps are constant in speed so as to ensure the stability of flow transition when the pump is cut.
When multiple pumps are put in, the multiple flow rate profile characteristics are superimposed over time. To avoid dead-zone superposition for a smooth flow regulation effect, a segmented flow/frequency algorithm is used: (1) and determining the normal flow interval X dead zone interval Xd through a pump test. (2) When the target flow F mod X = Xd, the flow control enters the dead zone inefficiency section L. When the division is completed, the flow control enters the normal high-efficiency section H. (3) The segmentation formula is as follows: n = F/(X + Xd), and n is the number of started pumps; when the low-efficiency area is judged, the previous starting pump is low-frequency; when the high-frequency area is judged, the previous starting pump is high-frequency; and the pump is controlled by the PID to always switch to operate the pump. By this recursion, as the flow load increases, the working condition inefficiency and high efficiency alternately appear; the number of the starting pumps is increased, the high-low fixed frequency is adjusted by PID, and the operation is executed according to a recursion rule. Fig. 2 is a timing diagram of the pump.
Therefore, by setting the flow load subsection range X, the H-efficiency and the L-efficiency working condition interval are high in efficiency. The automatic program automatically calculates and optimizes the starting number of pumps, the running frequency and the regulation control method according to the characteristics of constant-flow water supply and centrifugal pump water supply, and achieves the stable process of backwashing.
Claims (1)
1. An automatic control method of a V-shaped filter device is characterized in that: dynamically analyzing parameters of the backwashing process, relating to the relation between the congestion rate and the hydraulic load and the backwashing period and time, and optimizing the backwashing efficiency; performing sequential cross backwashing on the multiple filter tanks, and expanding the treatment load of the filter tanks from the perspective of software; meanwhile, more backwashing water is needed, and a water distribution PID control method matched with the characteristics of the centrifugal pump is correspondingly provided;
the implementation flow of the automatic control method is as follows,
s1, filtering the influence of congestion rate R abnormity and water quantity mutation factors on backwashing time A \ B \ C and backwashing period T in a backwashing flow sequence;
abnormal congestion rate: r = dY/dt represents the congestion rate, Y is the water loss instrument value, and t time; detecting the current congestion rate R and the empirical characteristic value R in real time in a program t Comparing to obtain a difference value E t When E is = | R-Rt | t If the current congestion is more than a | Tt |, judging that the current congestion is abnormal, wherein a is a set coefficient; when congestion is abnormal, the backwashing time A \ B \ C is amplified, and the washing time is increased;
water quantity mutation: when water quantity mutation occurs and the high-load inflow water flow rate F load occurs, shortening the washing interval period T parameter among the pools in advance; by using a piecewise ratio method, when F>130% by weight of X, T =90% 0 (ii) a When F is present>160% X, T =80% 0 (ii) a When F is present>200% X, T =60% 0.
T 0 The experience period under normal load;
s2, backwashing the multiple filter tanks and carrying out cross polling load management treatment;
when the backwashing cross design of the multiple filter tanks is carried out, the sequence controllers U [ N ] are designed corresponding to the N filter tanks and correspond to the numerical controllers U [ N ] one by one;
s3, carrying out large-water-quantity backwashing on a corresponding water distribution PID control method matched with the characteristics of the centrifugal pump;
when multiple pumps are put in, the multiple flow curve characteristics are superimposed in time, using a segmented flow/frequency algorithm: (1) determining a normal flow interval X dead zone interval Xd through a pump test; (2) when the target flow FmodX = Xd, the flow control enters a dead zone low-efficiency section L; when the data is divided completely, the flow control enters a normal high-efficiency section H; (3) a segmentation formula: n = F/(X + Xd), n is the number of starting pumps; when the low-efficiency area is judged, the previous starting pump is low-frequency; when the high-frequency area is judged, the previous starting pump is high-frequency; the total number of the pumps is the current switching operation pump under the control of PID;
as the flow load increases, the working conditions of low efficiency and high efficiency alternately appear; the pump starting number is increased, the high and low fixed frequency is adjusted by PID, and the operation is executed according to a recursion rule.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210951493.1A CN115253484B (en) | 2022-08-09 | 2022-08-09 | Automatic control method of V-shaped filter tank device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210951493.1A CN115253484B (en) | 2022-08-09 | 2022-08-09 | Automatic control method of V-shaped filter tank device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115253484A true CN115253484A (en) | 2022-11-01 |
| CN115253484B CN115253484B (en) | 2023-08-11 |
Family
ID=83752226
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210951493.1A Active CN115253484B (en) | 2022-08-09 | 2022-08-09 | Automatic control method of V-shaped filter tank device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115253484B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000317227A (en) * | 1999-05-10 | 2000-11-21 | Meidensha Corp | Method for controlling washing of washing filter basin |
| US6562238B1 (en) * | 1998-12-29 | 2003-05-13 | Phillips Petroleum Company | Method and apparatus for controlling counter current |
| CN103449555A (en) * | 2012-05-28 | 2013-12-18 | 上海远动科技有限公司 | Carbon filter water quality advanced processing control method and device thereof based on dynamic PID adjusting technology |
| CN110182963A (en) * | 2019-05-07 | 2019-08-30 | 嘉诚环保工程有限公司 | The back purge system of improved biofilter and its application in the backwash of biofilter |
| US20190275448A1 (en) * | 2018-03-08 | 2019-09-12 | Mark W. Romers | Filter backwash control system for a water or wastewater treatment system to conserve water during the filter backwash process |
| CN111320272A (en) * | 2020-04-02 | 2020-06-23 | 安徽华骐环保科技股份有限公司 | Multi-condition controlled automatic back-flushing device for denitrification biological filter and operation method thereof |
| CN112723444A (en) * | 2021-01-06 | 2021-04-30 | 北控水务(中国)投资有限公司 | Control method and system for intelligently distributing water amount of filter tank |
| CN113144689A (en) * | 2020-11-08 | 2021-07-23 | 重庆市自来水有限公司 | Method for refined back-flushing control technology of tap water V-shaped filter tank |
-
2022
- 2022-08-09 CN CN202210951493.1A patent/CN115253484B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6562238B1 (en) * | 1998-12-29 | 2003-05-13 | Phillips Petroleum Company | Method and apparatus for controlling counter current |
| JP2000317227A (en) * | 1999-05-10 | 2000-11-21 | Meidensha Corp | Method for controlling washing of washing filter basin |
| CN103449555A (en) * | 2012-05-28 | 2013-12-18 | 上海远动科技有限公司 | Carbon filter water quality advanced processing control method and device thereof based on dynamic PID adjusting technology |
| US20190275448A1 (en) * | 2018-03-08 | 2019-09-12 | Mark W. Romers | Filter backwash control system for a water or wastewater treatment system to conserve water during the filter backwash process |
| CN110182963A (en) * | 2019-05-07 | 2019-08-30 | 嘉诚环保工程有限公司 | The back purge system of improved biofilter and its application in the backwash of biofilter |
| CN111320272A (en) * | 2020-04-02 | 2020-06-23 | 安徽华骐环保科技股份有限公司 | Multi-condition controlled automatic back-flushing device for denitrification biological filter and operation method thereof |
| CN113144689A (en) * | 2020-11-08 | 2021-07-23 | 重庆市自来水有限公司 | Method for refined back-flushing control technology of tap water V-shaped filter tank |
| CN112723444A (en) * | 2021-01-06 | 2021-04-30 | 北控水务(中国)投资有限公司 | Control method and system for intelligently distributing water amount of filter tank |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115253484B (en) | 2023-08-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110668562B (en) | Control method and system for eliminating membrane bioreactor pollution in real time and storage medium | |
| CN112783080A (en) | Automatic control method for advanced treatment of water plant | |
| CN111188784B (en) | Anti-surge self-adaptive control method | |
| EP4098628A1 (en) | Dosing control method for micro-flocculation in ultrafiltration | |
| CN115253484A (en) | Automatic control method of V-shaped filter device | |
| CN113087077A (en) | Energy-saving and consumption-reducing control system, method, device and medium for pressure type ultrafiltration membrane water purification system | |
| CN110935249A (en) | Self-cleaning control method and device for air filter | |
| CN112321027A (en) | Side-stream filtering system and method with multiple cleaning modes | |
| CN107544569B (en) | Control method for keeping constant liquid level of filtering state of V-shaped filter tank | |
| CN211112736U (en) | Washing machine system capable of realizing water quality monitoring and reclaimed water recycling | |
| CN113979493B (en) | Flushing control method and device of water purifying equipment, electronic equipment and water purifying equipment | |
| CN104524844B (en) | For the liquid level controlling method of filter tank cleaning | |
| CN110848781A (en) | Fume exhaust fan | |
| CN113266318B (en) | Self-learning-based stroke frequency adjusting method for rod-type pumping unit well | |
| CN213775538U (en) | Water washing system for gas turbine compressor | |
| CN108721934B (en) | Full-process automatic control method and system for rectifying tower | |
| CN111109632A (en) | Quality control method and system based on water immersion type tobacco stem moisture regaining | |
| CN114195207A (en) | Control method and device of water purifying equipment, electronic equipment and water purifying equipment | |
| CN112412630A (en) | Gas turbine compressor water washing system and control method thereof | |
| CN105060532A (en) | Intelligent anti-blocking and water-saving water purifier and water purifying method | |
| CN113313325A (en) | Desulfurization system operation optimization method, system, equipment and storage medium | |
| CN113655824A (en) | Wet desulphurization spraying amount and spraying slurry pH value coupling control optimization method | |
| CN109529625A (en) | A kind of continuous nanofiltration technique of lye | |
| CN115414720B (en) | Lamination filter for adjusting lamination tightness by utilizing motor and control system thereof | |
| JP6667282B2 (en) | Control method of water purification system and water purification 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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |