CN115849471A - Water treatment agent dosing accuracy self-calibration method - Google Patents
Water treatment agent dosing accuracy self-calibration method Download PDFInfo
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- CN115849471A CN115849471A CN202211440087.5A CN202211440087A CN115849471A CN 115849471 A CN115849471 A CN 115849471A CN 202211440087 A CN202211440087 A CN 202211440087A CN 115849471 A CN115849471 A CN 115849471A
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Abstract
The invention provides an accurate self-calibration method for adding water treatment medicament, which is characterized in that a liquid level meter is additionally arranged on a water treatment medicament box, the liquid level reduction volume of the medicament in the medicament box in unit time is monitored and counted, and the consumption of the medicament in unit time is calculated, so that the actual dosage of a metering pump is automatically calibrated. And the rule of the medicament concentration is quoted, the medicament concentration is set in a DCS/PLC control system, the deviation of medicaments in different batches is automatically measured, the medicament concentration after correction is carried out according to the corresponding model, and the medicament adding amount is changed, namely the medicament adding amount and the medicament concentration are calibrated simultaneously, and the accuracy of the water treatment medicament adding is realized. According to the scheme, the output of the water treatment agent addition is calibrated by a liquid level method, the metering pump frequency is adjusted according to a set value and the treated water quantity by introducing a medicament concentration concept, the accurate addition of the water treatment medicament is realized, the self-calibration purpose of the water treatment medicament addition is achieved, and the problem of the accurate addition of the medicament of an intelligent water treatment unit is solved.
Description
Technical Field
The invention relates to the field of water treatment, in particular to a self-calibration method for adding a water treatment agent.
Background
Along with the intellectualization of water treatment equipment, the deviation of the concentration of the medicament and the deviation of the dosage greatly influence the intellectualization development of the water treatment equipment, and a self-calibration system for adding the water treatment medicament is invented to change the current situation.
The adding amount (volume) of the water treatment agent depends on the metering pump, a diaphragm metering pump is adopted accurately, the reciprocating motion of the diaphragm is utilized to change the amplitude (stroke adjustment) of the reciprocating motion of the diaphragm, the frequency (frequency conversion adjustment and the running amount in unit time) of the reciprocating motion of the diaphragm is changed, the adding amount (volume) of the water treatment agent depends on the quality control and delivery calibration of a pump plant, and the corresponding pressure flow working condition can be selected only according to a curve graph given by the pump plant to estimate the output of the metering pump. However, due to the pressure value of the feeding point, the length and the elevation (the height from top to bottom) of the feeding pipeline, the consistency and the viscosity of the medicament, the existence of particles and the like, the working conditions of the feeding pump are influenced by the working conditions. The pump plant can not consider the concrete working conditions of the practical application of each dosing pump, so that the general applicability of the dosing pump can be realized, and the deviation of the dosing pump in practical application is large.
The deviation of the concentration of the medicament, the concentration of the medicament is because of the standards, production batches, etc. executed by each production plant, the concentration of the produced medicament is different, but the deviation of the concentration of the medicament is not considered in the current water treatment, the water treatment is operated according to the inherent dosage, the dosage is small, the treatment effect is poor, the dosage is large, the medicament is wasted, the subsequent treatment process is influenced, the deviation needs to be judged by operators according to the water outlet index or the water quantity, the improvement is made afterwards, the stability of the water treatment is poor, the manual intervention is needed, the self-adaptive operation difficulty is increased, and the intelligent process of the water treatment is not facilitated.
At present, diaphragm pumps are mostly adopted for water treatment as metering pumps, namely unidirectional upper valves and unidirectional lower valves are utilized, horizontal reciprocating actions of diaphragms are utilized, and the adding of a medicament in unit volume in the diaphragms is completed every time, the stroke (0 to 100%) and frequency conversion (0 to 50HZ) of the metering pumps are adjusted at present to ensure relatively accurate medicament adding, the precision of the method cannot meet the requirement of intelligent intellectualization of a water treatment technology, and in addition, the concentration of the medicament is always a big problem in water treatment.
The intelligent water treatment module can be developed from the following three large aspects, namely 1, water incoming indexes and water amount, wherein the water incoming indexes cannot be changed and only can be measured, namely, an instrument is arranged to complete detection, and the water amount can be properly adjusted; 2. the concentration and the dosage of the medicament for water treatment are controllable, and the accuracy of the medicament needs to be ensured, namely the problem to be solved by the invention; 3. according to the water inlet data measured by the instrument, the dosage, the retention time and the like are determined by utilizing the model, and the water quantity and other operation parameters are revised.
Disclosure of Invention
In order to solve the problems, the invention discloses an accurate self-calibration method for adding water treatment medicament.
A method for automatically calibrating the dosing accuracy of a water treatment medicament is characterized in that a liquid level meter is additionally arranged on a water treatment medicament box, the liquid level drop volume of the medicament in the medicament box in unit time is monitored and counted, the medicament concentration rule is introduced, the medicament concentration is set in a DCS/PLC system in operation, meanwhile, the deviation of different batches of medicaments is automatically measured by adopting an automatic medicament concentration calibration method and the self-calibration of the dosing of the treatment medicament, and the medicament concentration is automatically corrected and the dosed medicament is calibrated according to a corresponding model.
The invention further improves that: the rule of the medicament concentration is generally that 1.25 times of the theoretical value is set as 100%, namely the qualified medicament concentration is 80%, the medicament concentration is manually input according to different batches of medicaments, and the medicament adding accuracy is improved.
The invention further improves that: the level meter additionally arranged on the water treatment tank adopts a magnetic turning plate level meter or an ultrasonic level meter, the volume of the liquid level reduction of the medicament in unit time according to the running hour is monitored and counted, the volume is divided by the time, the adding volume of the medicament in unit time according to the minute is calculated, and the actual output of the medicament adding pump under the actual working condition is calibrated in turn.
The problem of the deviation of theoretical dosing amount and the actual dosing amount of the dosing pump is solved, the problem of output change caused by aging or mechanical reasons of the dosing pump is solved, the failure of output of the dosing pump and the substantial reduction of output are reported to the police, and the possibility of early-stage judgment of water treatment faults caused by the failure of output of the dosing pump is improved.
The invention further improves that: wherein the magnetic flap liquid level meter or the ultrasonic liquid level meter adopts a volume type or a pressure type.
The invention is further improved in that: wherein the magnetic flap liquid level meter or the ultrasonic liquid level meter is preferably volume type.
The invention further improves that: simultaneously, an anti-stirrer interference method is designed, the water treatment medicament is divided into a liquid level type and a solid dissolution type, the solid dissolution type is provided with a stirrer, the liquid level type is prevented from precipitating at times, the stirrer is also designed, the stirring of the stirrer interferes the measurement of a liquid level meter, and the method of accumulating and averaging in the original hour is adopted, so that the error of single measurement is avoided.
The invention further improves that: the automatic medicament concentration calibration method comprises the following steps: a certain maintenance space is reserved at the bottom of the water treatment medicine box, which is generally 15-30cm away from the bottom, so that a heavier part in the medicine is avoided; inserting an online meter; according to different water treatment agents, one of a pressure transmitter, a PH meter and a conductance or fluorescence detection device is adopted.
Setting a PH meter to check the concentration of the acid-base medicament and adapt to the condition of large PH change or the acid-base medicament;
a pressure transmitter is arranged to detect the medicament with larger weight difference according to the volume liquid level meter, so that the device is suitable for the medicament with larger specific gravity change;
a fluorescer transmitter is arranged to detect additive fluorescer agents, such as a fluorescent polymer-containing scale inhibitor (with the solid content of 42 percent, the fluorescent polymer-containing scale inhibitor realizes the normal operation of the concentration check of the online water treatment device and achieves the scale inhibition effect of the existing circulating water), and a fluorescer mother agent (which is directly added into a compound agent according to the proportion of 1 per mill or 0.5 per mill to realize the normal operation of the concentration check of the online water treatment device) and is suitable for the circulating water corrosion and scale inhibitor;
the conductance is set to detect the ion concentration of the medicament, and the medicament concentration is determined, so that the method is suitable for soluble salt medicaments.
An ORP meter is provided to detect the concentration of the reducing agent.
Meanwhile, the automatic medicament concentration calibration method adopts different online instruments to automatically calibrate the medicament concentration according to different medicaments, and cannot be used as a single calibration scheme because of medicament diversity and replacement problems of manufacturers, and can determine the effective components of the same batch of medicaments in the modes of laboratory measurement, inspection and the like to be used as assistance.
If the cost is not considered, a plurality of detecting instruments can be arranged to carry out the verification of the medicament concentration in a coordinated way.
The invention is further improved in that: self-calibration of water treatment agent dosing includes: the stroke of the metering pump needs to be fixed, the metering pump is only adjusted in the debugging process, metering pump frequency converters are arranged, and operators do not directly adjust the frequency conversion setting of the metering pump, but change the frequency conversion setting of the metering pump into a medicament adding value of unit water volume, namely the amount of added medicament is L or mL per minute; the time value is the theoretical total amount of the medicament, namely 80% medicament concentration, the numerical value is multiplied by 80 and divided by the current medicament concentration in the system to calculate the volume of the medicament, and the corresponding frequency is output when the corresponding value of the volume and the frequency of the metering pump calibrated by a liquid level meter is used, and finally the medicament is accurately added.
The invention further improves that: the specific method for self-calibration of the output of the metering pump comprises the following steps:
step 1: determining the sectional area according to the measured radius or length and width, adding water and discharging, and determining the theoretical and actual deviation of the sectional area;
and 2, step: and (3) setting the metering pump to a planned stroke, if the metering pump is added through a pipeline, ensuring the pressure of the metering pump, namely starting the metering pump under the actual working condition, and recording the medicament consumption in unit time.
And 3, finishing the measurement, setting an upper deviation value and a lower deviation value, and finishing the automatic calibration of the output of the metering pump by the DCS or the PLC.
The problem of the deviation of theoretical dosing amount and the actual dosing amount of the dosing pump is solved, the problem of output change caused by aging or mechanical reasons of the dosing pump is solved, the failure of output of the dosing pump and the substantial reduction of output are reported to the police, and the possibility of early-stage judgment of water treatment faults caused by the failure of output of the dosing pump is improved.
The invention further improves that: in the step 2, when only power frequency is measured in a non-frequency conversion mode, if the metering pump is in non-frequency conversion regulation, an operator is prompted to manually regulate the stroke until the use requirement is met; the frequency conversion requires multi-frequency measurement and the next step.
The invention has the beneficial effects that:
1. according to the scheme, the liquid level meter measurement and control system is utilized, the metering pump works under the actual working condition, the volume of the medicament ejected by the metering pump in unit time is calculated, and the output force of the metering pump under the actual working condition is calibrated; the problem of the measuring pump inaccurate output under operating condition is solved.
2. The scheme introduces the concept of medicament concentration, sets a simple automatic calibration instrument on site, and determines the medicament concentration by adopting an auxiliary means of laboratory measurement; the interference to the water treatment effect due to the fluctuation of the concentration of the medicament is solved.
3. According to the scheme, the frequency converter is adopted to adjust the metering output according to the actual treated water amount, and on the premise of determining the concentration of the medicament and the output of the metering pump, the medicament is accurately added, so that the purpose of self-calibration of adding of the water treatment medicament is achieved; the stability of the water treatment equipment is improved, and the waste of the medicament is avoided; according to the concentration of the medicament and the set value of the medicament output, the frequency conversion setting is automatically adjusted, and the water treatment medicament is added.
Detailed Description
The present invention will be further illustrated below with reference to specific embodiments, which are to be understood as merely illustrative and not limitative of the scope of the present invention.
The embodiment provides an accurate self-calibration method for adding water treatment chemicals, which is characterized in that a liquid level meter is additionally arranged on a water treatment chemical box, the descending volume of the liquid level of the chemicals in the chemical box in unit time is monitored and counted, the rule of the concentration of the chemicals is introduced, the concentration of the chemicals is set in a DCS/PLC (distributed control system/programmable logic controller) system in operation, meanwhile, the deviation of the chemicals in different batches is automatically measured by adopting an automatic chemical concentration calibration method and self-calibration for adding the processing chemicals, and the concentration of the chemicals is automatically corrected and the added chemicals are calibrated according to corresponding models.
The rule of the medicament concentration is generally that 1.25 times of the theoretical value is set as 100%, namely the qualified medicament concentration is 80%, the medicament concentration is manually input according to different batches of medicaments, and the medicament adding accuracy is improved.
The level gauge that this embodiment adds on water treatment box adopts the magnetism to turn over the board level gauge, monitors and counts the medicament liquid level decline volume in unit time according to the operation hour meter, and the volume divides the time, calculates unit time according to dividing the meter, and the volume of throwing of medicament, the actual power of exerting oneself of the pump that adds under the calibration operating condition in return.
This embodiment simultaneous design anti mixer interference method because the water treatment medicament divide into liquid level or solid and dissolve two kinds, and the solid dissolves the type and all is equipped with the mixer, and the liquid level type is avoided the sediment sometimes and also can be designed the mixer, and the stirring of mixer has the interference to the level gauge measurement, adopts the method of calculating the average in the accumulation of carrying on in original hour, avoids single measuring error.
The automatic medicament concentration calibration method comprises the following steps: a certain maintenance space is reserved at the bottom of the water treatment medicine box, which is generally 15-30cm away from the bottom, so that a heavier part in the medicine is avoided; inserting an online meter; according to different water treatment agents, one of a pressure transmitter, a PH meter and a conductance or fluorescence detection device is adopted.
The self-calibration of the water treatment agent dosing comprises the following steps: the stroke of the metering pump needs to be fixed, the metering pump is only adjusted in the debugging process, metering pump frequency converters are arranged, and operators do not directly adjust the frequency conversion setting of the metering pump, but change the frequency conversion setting of the metering pump into a medicament adding value of unit water volume, namely the amount of added medicament is L or mL per minute; the time value is the theoretical total amount of the medicament, namely 80% medicament concentration, the numerical value is multiplied by 80 and divided by the current medicament concentration in the system to calculate the volume of the medicament, and the corresponding frequency is output when the corresponding value of the volume and the frequency of the metering pump calibrated by a liquid level meter is used, and finally the medicament is accurately added.
The specific method for self-calibration of the output of the metering pump comprises the following steps:
step 1: determining the sectional area according to the measured radius or length and width, adding full water, discharging, and determining the theoretical and actual deviation of the sectional area;
and 2, step: setting a metering pump to a planned stroke, if the metering pump is added into a pipeline, ensuring the pressure of the metering pump, namely starting the metering pump under the actual working condition, and recording the consumption of the medicament in unit time; when the non-frequency conversion only measures the power frequency, if the metering pump is in non-frequency conversion adjustment, the operator is prompted to manually adjust the stroke until the use requirement is met; the frequency conversion requires multi-frequency measurement and the next step.
And 3, finishing the measurement, setting an upper deviation value and a lower deviation value, and finishing the automatic calibration of the output of the metering pump by the DCS or the PLC.
The technical means disclosed in the invention scheme are not limited to the technical means disclosed in the above embodiments, but also include the technical scheme formed by any combination of the above technical features.
Claims (12)
1. A water treatment medicament dosing accurate self-calibration method is characterized by comprising the following steps: the liquid level meter is additionally arranged on the water treatment medicine box, the liquid level reduction volume of the medicine in the medicine box in unit time is monitored and counted, and the consumption of the medicine in unit time is calculated, so that the actual medicine output amount of the metering pump is automatically calibrated; and the rule of the medicament concentration is quoted, the medicament concentration is set in a DCS/PLC control system, the manufacturing cost of equipment is considered, a simple online instrument is generally set, automatic calibration is carried out, a laboratory is used for carrying out regular detection and revision, the deviation of medicaments in different batches is automatically measured, the medicament dosage is changed according to the corrected medicament concentration and the corresponding model, namely, the medicament dosage and the medicament concentration are calibrated at the same time, and the accuracy of the medicament dosage in water treatment is realized.
2. The method for accurate self-calibration of dosing of a water treatment chemical according to claim 1, wherein: the rule of the medicament concentration is generally that 1.25 times of the theoretical value is set as 100%, namely the qualified medicament concentration is 80%, the medicament concentration is manually input according to different batches of medicaments, and the medicament adding accuracy is improved.
3. The water treatment agent dosing accuracy self-calibration method according to claim 1, characterized in that: the level meter additionally arranged on the water treatment tank adopts a magnetic turning plate level meter or an ultrasonic level meter, the volume of the liquid level reduction of the medicament in unit time according to the running hour is monitored and counted, the volume is divided by the time, the adding volume of the medicament in unit time according to the minute is calculated, and the actual output of the medicament adding pump under the actual working condition is calibrated in turn.
4. The method for accurate self-calibration of dosing of a water treatment chemical according to claim 1, wherein: the magnetic turning plate liquid level meter or the ultrasonic liquid level meter adopts a volume type, and can also adopt a pressure type of a pressure transmitter.
5. The method for accurate self-calibration of dosing of a water treatment chemical according to claim 4, wherein: the magnetic turning plate liquid level meter or the ultrasonic liquid level meter is preferably volume type.
6. The water treatment agent dosing accuracy self-calibration method according to claim 1, characterized in that: simultaneously, an anti-stirrer interference method is designed, the water treatment medicament is divided into a liquid level type and a solid dissolution type, the solid dissolution type is provided with a stirrer, the liquid level type is prevented from precipitating at times, the stirrer is also designed, the stirring of the stirrer interferes the measurement of a liquid level meter, and the method of accumulating and averaging in the original hour is adopted, so that the error of single measurement is avoided.
7. The method for accurate self-calibration of dosing of a water treatment chemical according to claim 1, wherein: the automatic medicament concentration calibration method comprises the following steps: a certain maintenance space is reserved at the bottom of the water treatment medicine box, which is generally 15-30cm away from the bottom, so that a heavier part in the medicine is avoided; inserting an online meter; according to different water treatment agents, one or more combined methods of a pressure transmitter, a pH meter, conductance, fluorescence detection or other devices are adopted.
8. The automatic drug concentration calibration method of claim 1, wherein: with external revisions, the data of the laboratory, testing facility can be adopted for revising.
9. The method for accurate self-calibration of dosing of a water treatment chemical according to claim 1, wherein: self-calibration of water treatment agent dosing includes: the stroke of the metering pump needs to be fixed, the metering pump is only adjusted in the debugging process, metering pump frequency converters are arranged, and operators do not directly adjust the frequency conversion setting of the metering pump, but change the frequency conversion setting of the metering pump into a medicament adding value of unit water volume, namely the amount of added medicament is L or mL per minute; the time value is the theoretical total amount of the medicament, namely 80% medicament concentration, the numerical value is multiplied by 80 and divided by the current medicament concentration in the system to calculate the volume of the medicament, and the corresponding frequency is output when the corresponding value of the volume and the frequency of the metering pump calibrated by a liquid level meter is used, and finally the medicament is accurately added.
10. The method for accurate self-calibration of dosing of a water treatment chemical according to claim 8, wherein: the specific method for self-calibration of the output of the metering pump comprises the following steps:
step 1: determining the sectional area according to the measured radius or length and width, adding full water, discharging, and determining the theoretical and actual deviation of the sectional area;
step 2: setting a metering pump to a planned stroke, if the metering pump is added into a pipeline, ensuring the pressure of the metering pump, namely starting the metering pump under the actual working condition, and recording the consumption of the medicament in unit time;
and 3, finishing the measurement, setting an upper deviation value and a lower deviation value, and finishing the automatic calibration of the output of the metering pump by the DCS or the PLC.
11. The water treatment agent dosing accuracy self-calibration method according to claim 10, wherein: because the real-time statistics is carried out on the medicament consumption, when a medicament pipeline is blocked, the output of the medicament is reduced or is not output; when the medicament pipeline breaks, the problems such as rapid medicament loss and the like are alarmed for the first time, the effluent quality deterioration of a water treatment system is avoided, subsequent treatment equipment is influenced, and the economic and environmental losses caused by medicament loss are avoided.
12. The method for accurate self-calibration of dosing of a water treatment chemical as recited in claim 10, wherein: in the step 2, when only power frequency is measured in a non-frequency conversion mode, if the metering pump is in non-frequency conversion regulation, an operator is prompted to manually regulate the stroke until the use requirement is met; the frequency conversion requires multi-frequency measurement and the next step.
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| CN202211440087.5A CN115849471A (en) | 2022-11-17 | 2022-11-17 | Water treatment agent dosing accuracy self-calibration method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117566976A (en) * | 2024-01-12 | 2024-02-20 | 光大水务（淄博）有限公司 | Fenton process accurate dosing control system and method thereof |
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- 2022-11-17 CN CN202211440087.5A patent/CN115849471A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117566976A (en) * | 2024-01-12 | 2024-02-20 | 光大水务（淄博）有限公司 | Fenton process accurate dosing control system and method thereof |
| CN117566976B (en) * | 2024-01-12 | 2024-03-26 | 光大水务（淄博）有限公司 | Fenton process accurate dosing control system and method thereof |
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