CN113591317A - Control method for accurate sludge discharge model of water plant reaction sedimentation tank - Google Patents
Control method for accurate sludge discharge model of water plant reaction sedimentation tank Download PDFInfo
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- 239000010802 sludge Substances 0.000 title claims abstract description 161
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 86
- 238000004062 sedimentation Methods 0.000 title claims abstract description 65
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000011217 control strategy Methods 0.000 claims abstract description 8
- 230000007246 mechanism Effects 0.000 claims abstract description 5
- 238000007599 discharging Methods 0.000 claims description 26
- 239000003814 drug Substances 0.000 claims description 3
- 238000011156 evaluation Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 238000007405 data analysis Methods 0.000 abstract description 3
- 239000002699 waste material Substances 0.000 abstract description 3
- 238000009412 basement excavation Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
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- G06F2119/02—Reliability analysis or reliability optimisation; Failure analysis, e.g. worst case scenario performance, failure mode and effects analysis [FMEA]
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
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- G06F2119/22—Yield analysis or yield optimisation
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Abstract
The invention discloses a control method of an accurate sludge discharge model of a reaction sedimentation tank of a water plant, belonging to the technical field of water treatment, and the control method comprises the following steps: (1) establishing a sludge discharge model; (2) linearization of a sludge discharge model; (3) defining the mud quantity sedimentation distribution proportion; (4) defining sludge discharge strategy parameters; (5) calculating the current mud amount in real time; (6) automatically matching a sludge discharge strategy; (7) issuing a control strategy instruction; (8) feeding back the operation of an actuating mechanism of the sludge discharge facility; (9) estimating the amount of discharged sludge; according to the method, through historical data analysis and excavation, the sludge discharge amount of the reaction sedimentation tank of the water plant is modeled, the real-time sludge amount of the reaction sedimentation tank of the water plant is predicted, the system selects a sludge discharge strategy according to self-learning of the sludge amount, the sludge discharge strategy is updated to carry out accurate sludge discharge, the sludge discharge amount is effectively controlled, the water waste caused by ineffective sludge discharge is reduced, the production cost of the water plant is reduced, and meanwhile, the running risks of a sludge hopper, the over-standard water quality of the sedimentation tank and the like caused by insufficient sludge discharge can be avoided.
Description
Technical Field
The invention relates to the technical field of water treatment, in particular to a control method of an accurate sludge discharge model of a reaction sedimentation tank of a water plant.
Background
Through retrieval, the Chinese patent No. CN107837574A discloses a sludge discharge method of a sludge discharge system of a sedimentation tank, the invention focuses on the optimized design of a sludge discharge pipe of the sedimentation tank to realize the reduction of a sludge discharge blind area, and although the sludge discharge method has a better sludge discharge effect, the sludge accumulation at the bottom of the tank can be effectively prevented, the sludge amount generated by the sedimentation tank cannot be accurately predicted, and the phenomenon of excessive sludge discharge or insufficient sludge discharge is easily caused; the dosing sedimentation tank in a water plant or a sewage plant is easy to generate a large amount of sludge, and if the sludge is not discharged in time, the sedimentation tank is easy to turn over, so that the quality of effluent water is seriously influenced; if the sludge is discharged too frequently or the sludge discharge time is too long, the water content of the discharged sludge is increased, the difficulty of subsequent treatment is increased, the self-water consumption of a sedimentation tank is increased, and water resources are wasted seriously; at present, a method for accurately calculating and predicting the amount of sludge generated by a sedimentation tank and a control strategy for accurately discharging sludge by using a sludge discharge valve of a reaction sedimentation tank and a sludge discharge crane do not exist in a sludge discharge system of a water plant, and the bottom sludge discharge of the reaction sedimentation tank is mainly controlled by adopting a fixed period and a fixed sludge discharge time, so that on one hand, excessive sludge discharge causes the increase of sludge water amount and the corresponding increase of cost, on the other hand, insufficient sludge discharge causes the water quality risk of high turbidity of the outlet water of the sedimentation tank due to overhigh sludge level in the sedimentation tank, and the sludge accumulation of a sludge discharge hopper is hardened; therefore, the method for controlling the accurate sludge discharge model of the reaction sedimentation tank of the water plant is important;
the existing sludge discharge system of a water plant mainly adopts a fixed period and fixed sludge discharge duration to control the bottom sludge discharge of a reaction sedimentation tank, which cannot accurately predict the sludge amount generated by the sedimentation tank, easily causes excessive sludge discharge or insufficient sludge discharge, easily causes water waste, causes corresponding cost increase, and easily affects the effluent quality of the sedimentation tank; therefore, a control method of an accurate sludge discharge model of a reaction sedimentation tank of a water plant is provided.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a control method of an accurate sludge discharge model of a reaction sedimentation tank of a water plant.
In order to achieve the purpose, the invention adopts the following technical scheme:
a control method for an accurate sludge discharge model of a reaction sedimentation tank of a water plant comprises the following specific steps:
(1) establishing a sludge discharge model: calculating the mud yield of the reaction sedimentation tank according to historical data of the water plant, and establishing a mud discharge model according to the probability distribution of the mud yield;
(2) linearization of a sludge discharge model: carrying out linear classification and sludge discharge strategy definition on the sludge discharge model in the step (1) according to probability distribution, and simultaneously defining a plurality of linear sludge discharge strategies according to probability distribution;
(3) defining the mud quantity and sedimentation distribution proportion: determining the distribution proportion of the sludge amount in the reaction tank and the sedimentation tank by measuring the data of the water quality of inlet water and the water quality of outlet water of the reaction tank and analyzing, and determining the spatial distribution of the sludge amount in the sedimentation tank by measuring the sludge distribution at the bottom of the sedimentation tank;
(4) defining the parameters of a sludge discharge strategy: defining the accurate operation parameters of a mud valve and a mud sucking travelling crane of each mud discharging strategy according to the mud discharging amount of the reaction sedimentation tank and the physical parameters of the reaction sedimentation tank;
(5) calculating the current mud amount in real time: calculating the current actual mud amount according to the current water amount, the medicine adding amount and the water quality;
(6) the mud discharging strategy is automatically matched: automatically determining a mud discharging strategy according to the current actual mud amount in the step (5), and outputting a mud discharging control parameter instruction;
(7) and (3) issuing a control strategy instruction: enabling the sludge to reach a PLC (programmable logic controller) under the command of the sludge discharge control parameters in the step (6);
(8) and (3) operation feedback of an actuating mechanism of the sludge discharge facility: feeding back and confirming a mud discharging control parameter instruction according to the running states of the mud discharging valve and the mud suction crane, and executing;
(9) estimating the sludge discharge amount: and calculating the sludge discharge water quantity according to the sludge discharge control parameter instruction execution condition and the sludge discharge parameters and carrying out online sludge discharge efficiency evaluation.
Further, the historical data in the step (1) are dynamically rolled at the annual interval of one year or more, so that model self-learning updating is realized, and the model self-learning updating comprises but is not limited to water quality data, water quantity data and dosage data.
Further, the formula expression form of the sludge discharge model in the step (1) is as follows:
S(t)＝a(c*f(u,x)+d*f(w,y))v (1)
in the formula: a represents a water quantity coefficient; v represents the volume of water volume and c represents a water quality influence factor; d represents a dose-influencing factor; f (u, x) represents a water quality conversion function; f (w, y) represents a conversion function of the dose amount; s represents the amount of produced mud per time period.
Further, the formula of the probability distribution in step (2) is as follows:
in the formula: p is the probability of occurrence of mud amount; a. theiIs the sludge discharge event per unit time.
Further, the accurate operation parameters of the mud discharging valve and the mud sucking travelling crane in the step (4) include but are not limited to a valve mud discharging period, a valve mud discharging time, a travelling distance and a travelling frequency.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the control method of the accurate sludge discharge model of the water plant reaction sedimentation tank, through historical data analysis and excavation, the sludge discharge amount of the water plant reaction sedimentation tank is modeled, the real-time sludge amount of the water plant reaction sedimentation tank is predicted, a system selects a sludge discharge strategy according to self-learning of the sludge amount, the sludge discharge strategy is updated for accurate sludge discharge, the sludge discharge amount is effectively controlled, waste of water caused by ineffective sludge discharge is reduced, the production cost of the water plant is reduced, meanwhile, the running risks of a sludge hopper, the exceeding of the water quality of the sedimentation tank and the like caused by insufficient sludge discharge can be avoided, and the running safety and the stability of a key process section of the water plant are improved;
2. compared with the traditional reaction sedimentation tank sludge discharge control method, the water plant reaction sedimentation tank accurate sludge discharge model control method can reduce the sludge discharge amount and water consumption by 30-50%; the actual sludge discharge amount is dynamically and accurately calculated and predicted and coupled with a control strategy, so that the operation condition of the sludge discharge facility can be accurately controlled, the problem that the operation condition of the sludge discharge facility is not matched with the actual sludge amount in manual control or traditional program control is solved, the control accuracy is improved, and the reliability and the stability of the effluent quality of the sedimentation tank are ensured;
3. according to the control method of the accurate sludge discharge model of the reaction sedimentation tank of the water plant, the control of the sludge discharge process of the reaction sedimentation tank is changed from manual control or manual parameter adjustment control into automatic and dynamic control of a system according to the sludge amount, so that the frequency and workload of manual participation are reduced, unattended operation is realized, and the labor cost and the working intensity are favorably reduced; in addition, the method can accurately calculate the sludge discharge amount through the sludge discharge parameters, and can be used for analyzing the sludge discharge efficiency and evaluating the sludge discharge effect and the production water consumption rate in real time.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.
FIG. 1 is an overall flow chart of a control method for an accurate sludge discharge model of a reaction sedimentation tank of a water plant according to the present invention;
FIG. 2 is a schematic diagram of the daily mud production distribution of the mud discharging model;
FIG. 3 is a schematic diagram of a sludge discharge model linearization-probability distribution classification;
FIG. 4 is a schematic diagram of a sediment tank sludge amount distribution measurement sampling.
Detailed Description
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 only a part of the embodiments of the present invention, and not all of the embodiments.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the 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 construed as limiting the present invention.
Referring to fig. 1 to 4, the embodiment discloses a control method for an accurate sludge discharge model of a reaction sedimentation tank of a water plant, which comprises the following specific steps:
firstly, establishing a sludge discharge model: calculating the mud yield of the reaction sedimentation tank according to the historical data of the water plant, and establishing a mud discharge model according to the probability distribution of the mud yield (as shown in figure 2); specifically, the historical data is dynamically rolled at a year interval of one year or more, so that model self-learning updating is realized, and the model self-learning updating comprises but is not limited to water quality data, water quantity data and dosage data; the mud discharging model can accurately quantify the unknown mud production of the sedimentation tank.
Then, linearization of a sludge discharge model: carrying out linear classification and sludge discharge strategy definition on the sludge discharge model according to probability distribution, and simultaneously defining a plurality of linear sludge discharge strategies according to probability distribution (as shown in figure 3); specifically, the linearization of the sludge discharge model is a key step for solving a sludge discharge control strategy, and the nonlinear model can be converted into a linear model to control a sludge discharge actuating mechanism (a sludge discharge valve and a sludge suction crane), so that the operability of actual production is greatly improved; the formula of the probability distribution is expressed as:
in the formula: p is the probability of occurrence of mud amount; a. theiIs the sludge discharge event per unit time.
Then defining the mud quantity and the sedimentation distribution ratio: determining the distribution proportion of the sludge amount in the reaction tank and the sedimentation tank by measuring the data of the water quality of inlet water and the water quality of outlet water of the reaction tank and analyzing, and determining the spatial distribution of the sludge amount in the sedimentation tank by measuring the sludge distribution at the bottom of the flat sedimentation tank; specifically, the definition of the mud quantity distribution proportion is to control the accurate allocation of the total mud quantity to the reaction tank and the sedimentation tank, and is a precondition step for improving the accurate control of the mud discharge.
And then defining the parameters of a mud discharging strategy: defining the accurate operation parameters of a mud valve and a mud sucking travelling crane of each mud discharging strategy according to the mud discharging amount of the reaction sedimentation tank and the physical parameters of the reaction sedimentation tank; specifically, the accurate operation parameters of the mud discharge valve and the mud suction crane include, but are not limited to, a valve mud discharge period, a valve mud discharge time, a crane travel distance and a crane travel frequency.
Then, the current mud amount is calculated in real time: calculating the current actual mud amount according to the current water amount, the medicine adding amount and the water quality;
and then automatically matching a mud discharging strategy: automatically determining a sludge discharge strategy according to the current actual sludge amount, and outputting a sludge discharge control parameter instruction; specifically, the step is a key step for coupling the actual mud amount with the control strategy, and the optimal control strategy matching of different mud amounts is ensured.
And then controlling a strategy instruction to issue: the sludge discharge reaches the PLC under the command of sludge discharge control parameters; then feeding back the operation of an actuating mechanism of the sludge discharge facility: feeding back and confirming a mud discharging control parameter instruction according to the running states of the mud discharging valve and the mud suction crane, and executing;
and finally estimating the sludge discharge amount: and calculating the sludge discharge water quantity according to the sludge discharge control parameter instruction execution condition and the sludge discharge parameters and carrying out online sludge discharge efficiency evaluation.
Example data analysis is detailed below:
referring to fig. 1, the present embodiment will specifically describe a sludge discharge model, except for the same structure as the above embodiment; specifically, the formula expression form of the sludge discharge model is as follows:
S(t)＝a(c(*fu,x)+d*f(w,y))v
in the formula: a represents a water quantity coefficient; v represents the volume of water volume and c represents a water quality influence factor; d represents a dose-influencing factor; f (u, x) represents a water quality conversion function; f (w, y) represents a conversion function of the dose amount; s represents the amount of produced mud per time period.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (5)
1. A control method for an accurate sludge discharge model of a reaction sedimentation tank of a water plant is characterized by comprising the following specific steps:
(1) establishing a sludge discharge model: calculating the mud yield of the reaction sedimentation tank according to historical data of the water plant, and establishing a mud discharge model according to the probability distribution of the mud yield;
(2) linearization of a sludge discharge model: carrying out linear classification and sludge discharge strategy definition on the sludge discharge model in the step (1) according to probability distribution, and simultaneously defining a plurality of linear sludge discharge strategies according to probability distribution;
(3) defining the mud quantity and sedimentation distribution proportion: determining the distribution proportion of the sludge amount in the reaction tank and the sedimentation tank by measuring the data of the water quality of inlet water and the water quality of outlet water of the reaction tank and analyzing, and determining the spatial distribution of the sludge amount in the sedimentation tank by measuring the sludge distribution at the bottom of the sedimentation tank;
(4) defining the parameters of a sludge discharge strategy: defining the accurate operation parameters of a mud valve and a mud sucking travelling crane of each mud discharging strategy according to the mud discharging amount of the reaction sedimentation tank and the physical parameters of the reaction sedimentation tank;
(5) calculating the current mud amount in real time: calculating the current actual mud amount according to the current water amount, the medicine adding amount and the water quality;
(6) the mud discharging strategy is automatically matched: automatically determining a mud discharging strategy according to the current actual mud amount in the step (5), and outputting a mud discharging control parameter instruction;
(7) and (3) issuing a control strategy instruction: enabling the sludge to reach a PLC (programmable logic controller) under the command of the sludge discharge control parameters in the step (6);
(8) and (3) operation feedback of an actuating mechanism of the sludge discharge facility: feeding back and confirming a mud discharging control parameter instruction according to the running states of the mud discharging valve and the mud suction crane, and executing;
(9) estimating the sludge discharge amount: and calculating the sludge discharge water quantity according to the sludge discharge control parameter instruction execution condition and the sludge discharge parameters and carrying out online sludge discharge efficiency evaluation.
2. The method for controlling the accurate sludge discharge model of the reaction and sedimentation tank of the water plant as claimed in claim 1, wherein the historical data of step (1) is dynamically rolled at a year interval of one year or more to realize model self-learning update, which includes but is not limited to water quality data, water quantity data and dosage data.
3. The method for controlling the accurate sludge discharge model of the water plant reaction sedimentation tank as claimed in claim 1, wherein the sludge discharge model in the step (1) is expressed by the following formula:
S(t)＝a(c*f(u，x)+d*f(w，y))v (1)
in the formula: a represents a water quantity coefficient; v represents the volume of water volume and c represents a water quality influence factor; d represents a dose-influencing factor; f (u, x) represents a water quality conversion function; f (w, y) represents a conversion function of the dose amount; s represents the amount of produced mud per time period.
4. The method for controlling the accurate sludge discharge model of the water plant reaction sedimentation tank as claimed in claim 1, wherein the formula expression form of the probability distribution in the step (2) is as follows:
in the formula: p is the probability of occurrence of mud amount; a. theiIs the sludge discharge event per unit time.
5. The method for controlling the accurate sludge discharge model of the water plant reaction sedimentation tank as claimed in claim 1, wherein the accurate operation parameters of the sludge discharge valve and the sludge suction crane in the step (4) include, but are not limited to, a valve sludge discharge period, a valve sludge discharge time, a crane travel distance and a crane travel frequency.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115936269A (en) * | 2023-03-14 | 2023-04-07 | 北京埃睿迪硬科技有限公司 | Method, device and equipment for predicting sludge discharge amount |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003062406A (en) * | 2001-08-28 | 2003-03-04 | Fuji Electric Co Ltd | Sludge-discharge controlling method for sludge in sedimentation pond of water-purifying process |
| CN103605859A (en) * | 2013-11-28 | 2014-02-26 | 浙江工业大学 | Optimum design method for secondary sedimentation tank of sewage treatment work |
| KR101914285B1 (en) * | 2018-05-15 | 2018-11-01 | 주식회사 코비 | Integrated measurement and control system for water treatment plant |
| CN110833710A (en) * | 2019-10-25 | 2020-02-25 | 上海水业设计工程有限公司 | Control system and control method for sludge discharge of sedimentation tank |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003062406A (en) * | 2001-08-28 | 2003-03-04 | Fuji Electric Co Ltd | Sludge-discharge controlling method for sludge in sedimentation pond of water-purifying process |
| CN103605859A (en) * | 2013-11-28 | 2014-02-26 | 浙江工业大学 | Optimum design method for secondary sedimentation tank of sewage treatment work |
| KR101914285B1 (en) * | 2018-05-15 | 2018-11-01 | 주식회사 코비 | Integrated measurement and control system for water treatment plant |
| CN110833710A (en) * | 2019-10-25 | 2020-02-25 | 上海水业设计工程有限公司 | Control system and control method for sludge discharge of sedimentation tank |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115936269A (en) * | 2023-03-14 | 2023-04-07 | 北京埃睿迪硬科技有限公司 | Method, device and equipment for predicting sludge discharge amount |
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