CN101941740A - On-line detection method of lag time of water treatment dosing control - Google Patents
On-line detection method of lag time of water treatment dosing control Download PDFInfo
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- CN101941740A CN101941740A CN201010215509XA CN201010215509A CN101941740A CN 101941740 A CN101941740 A CN 101941740A CN 201010215509X A CN201010215509X A CN 201010215509XA CN 201010215509 A CN201010215509 A CN 201010215509A CN 101941740 A CN101941740 A CN 101941740A
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Abstract
The invention relates to an on-line detection method of lag time of water treatment dosing control. The on-line detection method can solve the problems that the lag time in the water treatment control is determined by experience, the determination is inaccurate, and the dynamic detection can not be carried out. The method is realized through the following steps: mounting two flowmeters during the water treatment process, wherein the first flowmeter is mounted at a raw water inlet of a water treatment tank, and the second flowmeter is mounted at an outlet of a sedimentation tank; using the two flowmeters to detect data of flow rate changes in a real-time manner, wherein the first flowmeter is used for detecting the flow rate value at the raw water inlet, and the second flowmeter is used for detecting the flow rate value at the outlet of the sedimentation tank; recording maximum value or minimum value of the flow rate value at the raw water inlet in a time period (t, t plus 2a) as qm, and recording the time as tm; judging whether the maximum value or the minimum value of the water inlet flow rate in the time period (tm minus a, tm plus a) is the flow rate qm at the tm time, if so, turning to the next step; otherwise, updating the qm to the maximum flow rate value in the time period (tm minus a, tm plus a), updating the tm to the time of the maximum flow rate value in the time period (tm minus a, tm plus a), and repeating the step; recording the maximum value or the minimum value of the flow rate at the outlet of the sedimentation in the time period (tm, tm plus a) as qn, and recording the time as tn; and obtaining the lag time of a water treatment dosing control system at the tm time as follows.
Description
Technical field
The present invention relates to the online test method of a kind of water treatment dispensing control hysteresis time, mainly be applicable to water treatment field.
Background technology
Conventional water treatment is divided into coagulation, precipitation, filtration and sterilization several stages, and settling tank delivery turbidity size is an important indicator of water quality.Coagulation administration is the key link of water treatment.From being a very long process to the settling tank water outlet, from the dozens of minutes to the several hrs, do not wait at coagulation basin front end filling coagulating agent, formation flocs unit.Whole process is the complex system of non-linear a, large time delay, can't obtain the good control performance with general aim parameter closed-loop control.
At present, mathematical model method, streaming current method (SCD), the display type flocculation dispensing control method (FCD) etc. of mainly containing are controlled in water treatment automatically.Yet these methods all have its incomplete place.Influence retardation time in the not consideration water treatment that these methods had in modeling and control stage is as the mathematics modelling; Though and have considered hysteresis, just rule of thumb set a retardation time, as display type flocculation dispensing control method (FCD), but in fact retardation time can be according to flow, the variation of processing condition such as water treating pond structure and changing.
The setting of retardation time was an important step during water treatment system dispensing modelling and automatic control were set up, directly influence control effect.The setting of retardation time exists than large deviation with actual value, and can change according to processing condition such as flows retardation time mainly by the experience decision.Thereby the detection of retardation time is significant to modeling of water treatment administration system and automatic control system.
Summary of the invention
The objective of the invention is in order to solve the problem of water treatment dispensing control hysteresis time detecting, a kind of water treatment online test method of dispensing control hysteresis time is provided, for water treatment system dispensing modelling and automatically in the control setting of retardation time the data support is provided.The response lag time between the online detection dispensing of the energy control key link.
For achieving the above object, the present invention adopts following technical proposals:
The online test method of a kind of water treatment dispensing control hysteresis time is characterized in that realizing by following steps:
1), two under meters are installed in water treatment process, the first flow meter is installed on water treatment treating pond original water inlet place, second under meter is installed on the settling tank exit;
2), described two under meters detect the fluctuations in discharge data in real time: the first flow meter detects original water inlet place flux values in real time, and second under meter detects settling tank rate of discharge value in real time;
3), the maximum value or the minimum value of the variation in the time period [t, t+2a] of record original water inlet place flux values are q
m, engrave and be t this moment
m
4), judge that flooding velocity is at time period [t
m-a, t
m+ a] whether interior maximum value or minimum value be t
mFlow q constantly
m, if change step 5 over to; If not, then make q
mBe updated to the time period [t
m-a, t
m+ a] interior peak flow values, t
mBe updated to the time period [t
m-a, t
m+ a] moment of peak flow values, the duplicate step 4 of laying equal stress on;
5), record settling tank rate of discharge is at time period [t
m, t
m+ a] in maximum value or minimum value be q
n, engrave and be t this moment
n
6), water treatment dispensing Controlling System is at t
mBe retardation time constantly
The present invention compared with prior art, have following conspicuous outstanding substantive distinguishing features and remarkable advantage: the invention provides a kind of water treatment online test method of dispensing control hysteresis time, for water treatment system dispensing model and automatically in the control setting of retardation time the data support is provided.The response lag time between the online detection dispensing of the energy control key link.
Description of drawings
The waterworks water treatment system figure that Fig. 1 adopts for the present invention.
Fig. 2 is the different rings amount of restriction variation relation synoptic diagram of system shown in Figure 1.
Embodiment
A preferred embodiment of the present invention is described as follows in conjunction with attached body: referring to Fig. 1 and Fig. 2, this water treatment system is that former water adds coagulating agent behind under meter 1, flow out through coagulation basin 2 and settling tank 3, chlorination behind a under meter 4 and filtering basin 5, one-tenth enters the tap water of pipe network at last.The online test method of this processing dispensing control hysteresis time is to realize by following operation steps:
1), two under meters are installed in water treatment process, first flow meter 1 is installed on water treatment treating pond original water inlet place, second under meter 4 is installed on the settling tank exit.
2), two under meters 1,4 detect the fluctuations in discharge data, the first flow meter 1 real-time original water inlet place flux values that detects, second under meter, the 4 real-time settling tank rate of discharge values that detect in real time.
3), the maximum value or the minimum value of the variation in the time period [t, t+2a] of record original water inlet place flux values are q
m, engrave and be t this moment
m
4), judge that flooding velocity is at time period [t
m-a, t
m+ a] whether interior maximum value or minimum value be t
mFlow q constantly
m, if change step 5 over to; If not, then make q
mBe updated to the time period [t
m-a, t
m+ a] interior peak flow values, t
mBe updated to the time period [t
m-a, t
m+ a] moment of peak flow values, the duplicate step 4 of laying equal stress on.
5), record settling tank rate of discharge is at time period [t
m, t
m+ a] in maximum value or minimum value be q
n, engrave and be t this moment
n
6), water treatment dispensing Controlling System is at t
mBe retardation time constantly
The a value is 0.5～4 hour in the present embodiment.
Claims (2)
1. the online test method of water treatment dispensing control hysteresis time is characterized in that realizing by following steps:
1), two under meters are installed in water treatment process, the first flow meter is installed on water treatment treating pond original water inlet place, second under meter is installed on the settling tank exit;
2), described two under meters detect the fluctuations in discharge data in real time: the first flow meter detects original water inlet place flux values in real time, and second under meter detects settling tank rate of discharge value in real time;
3), the maximum value or the minimum value of the variation in the time period [t, t+2a] of record original water inlet place flux values are q
m, engrave and be t this moment
m
4), judge that flooding velocity is at time period [t
m-a, t
m+ a] whether interior maximum value or minimum value be t
mFlow q constantly
m, if change step 5 over to; If not, then make q
mBe updated to the time period [t
m-a, t
m+ a] interior peak flow values, t
mBe updated to the time period [t
m-a, t
m+ a] moment of peak flow values, the duplicate step 4 of laying equal stress on;
5), record settling tank rate of discharge is at time period [t
m, t
m+ a] in maximum value or minimum value be q
n, engrave and be t this moment
n
6), water treatment dispensing Controlling System is at t
mBe retardation time constantly
2. according to claim 1 online test method of described water treatment dispensing control hysteresis time, it is characterized in that a value is set at 0.5～4 hour in the time period.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010215509XA CN101941740A (en) | 2010-06-29 | 2010-06-29 | On-line detection method of lag time of water treatment dosing control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010215509XA CN101941740A (en) | 2010-06-29 | 2010-06-29 | On-line detection method of lag time of water treatment dosing control |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101941740A true CN101941740A (en) | 2011-01-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010215509XA Pending CN101941740A (en) | 2010-06-29 | 2010-06-29 | On-line detection method of lag time of water treatment dosing control |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106335977A (en) * | 2016-09-08 | 2017-01-18 | 武汉长江仪器自动化研究所有限公司 | Tap water chlorination control method and system |
-
2010
- 2010-06-29 CN CN201010215509XA patent/CN101941740A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106335977A (en) * | 2016-09-08 | 2017-01-18 | 武汉长江仪器自动化研究所有限公司 | Tap water chlorination control method and system |
| CN106335977B (en) * | 2016-09-08 | 2019-06-11 | 武汉长江仪器自动化研究所有限公司 | A kind of tap water chlorination control method and system |
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Open date: 20110112 |