CN115745035A - Self-adaptive dosing method for maintaining quality of circulating cooling water - Google Patents
Self-adaptive dosing method for maintaining quality of circulating cooling water Download PDFInfo
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- CN115745035A CN115745035A CN202211441115.5A CN202211441115A CN115745035A CN 115745035 A CN115745035 A CN 115745035A CN 202211441115 A CN202211441115 A CN 202211441115A CN 115745035 A CN115745035 A CN 115745035A
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Abstract
The invention provides a self-adaptive dosing method for maintaining the quality of circulating cooling water, which utilizes an online water treatment detection device, a DCS or PLC control realization system, and manual measurement is only used as an auxiliary monitoring means; automatic acid feeding is realized, and the PH of the system is maintained in a normal range; the automatic scale inhibitor feeding is realized, the stability of the water quality of the system is maintained, and accidents are avoided; the self-calibration system for adding the water treatment agent is adopted, the output of the calibration and metering is obtained, the concentration of the agent is calibrated, the continuous adding within 24 hours is realized, the online instrument is used for replacing manual measurement, the improved sampling method of the water treatment chemical analysis instrument is adopted, the instrument input rate is ensured, the self-adaptive adding of the circulating water is realized, a large amount of manual operation is reduced, and the intellectualization of unit water treatment is realized.
Description
Technical Field
The invention provides the field of circulating water quality monitoring, and particularly relates to a self-adaptive dosing method for maintaining the quality of circulating cooling water.
Background
The intelligent intellectualization of the water treatment technology is started nowadays, and two main application aspects exist, namely, the allocation of water resources, namely, the allocation of time and space is completed by utilizing a convenient and fast network, a data model and the like, the regulation, the transportation and the allocation of the water resources are carried out, the ecological accumulation and the optimized allocation of the water resources are realized, and the water resource reuse and the like are also included; firstly, supplementary or improvement water treatment process's promotion realizes the self-adaptation operation, and this scheme is circulating cooling water quality of water among the water treatment technology keeps the self-adaptation technique.
The circulating cooling water is a large item of water used in industrial water, and in the industries of petrochemical industry, electric power, steel, metallurgy and the like, the consumption of the circulating cooling water accounts for 50-90% of the total water used by enterprises. Because the raw water has different salt contents, the circulating cooling water is concentrated to a certain multiple, certain concentrated water must be discharged, and new water is supplemented. A30 ten thousand KW condensation unit, the recirculated cooling water volume is about 3.3 ten thousand tons/hour, presume the salt content in the raw water is 1000mg/L, the concentration multiple is 3, then the concentrated water discharge of recirculated cooling water is about 6-8 per thousand, namely 198-264 m3/h, the new water that needs to be supplemented equals drainage and evaporation loss, etc. at the same time, make up the water volume about 2-2.6% of the recirculated water volume, will be about 660-860 m3/h, the water resource consumption and the quantity of sewage discharge are very big.
The circulating cooling water is restricted by the concentration ratio, so that a certain amount of concentrated water and a certain amount of new water must be discharged and replenished in operation. The salt content, the PH value, the organic matter concentration and the suspended matter content in the cooling water are controlled within a reasonable allowable range. The method has important significance for specific treatment and recycling of the part of concentrated water discharge. The method can not only improve the repeated utilization rate of water and save water resources, but also greatly improve the overall condition of circulating cooling water.
The circulating cooling water system is used as the first large water user of a thermal power plant, the operation of the whole power plant is concerned, operators generally adopt an excessive adding mode to add circulating cooling water to ensure the safety of a unit, the effect of effectively controlling scaling and microorganisms is achieved, the excessive adding of a medicament inevitably brings the waste of the medicament, the corrosion of equipment and the increase of concentrated water discharge, so that the water taking and the sewage discharging are increased, and the accurate regulation and control of the circulating water system is key for solving the problem.
Disclosure of Invention
In order to solve the problems, the invention discloses a self-adaptive dosing method for maintaining the quality of circulating cooling water, the scheme is that a monitoring instrument is arranged, a self-calibration system for adding water treatment agents is adopted, the output of metering is calibrated, the concentration of the agents is calibrated, 24-hour continuous addition is realized, an online instrument is used for replacing manual measurement, an improved sampling method of a water treatment chemical analysis instrument is adopted, the input rate of the instrument is ensured, the self-adaptive dosing of the circulating water is realized, a large amount of manual operation is reduced, and the intellectualization of unit water treatment is realized.
The self-adaptive dosing method for maintaining the quality of the circulating cooling water utilizes an online water treatment detection device and a DCS or PLC control realization system, and manual measurement is only used as an auxiliary monitoring means; automatic acid feeding is realized, and the PH of the system is maintained in a normal range; the automatic scale inhibitor feeding is realized, the stable water quality of the system is maintained, and accidents are avoided.
The invention is further improved in that: the online water treatment detection device comprises a pH monitor, a scale inhibitor concentration detection device, an ORP online monitor, a conductivity online monitor, a turbidity online monitor, an online corrosion rate monitor, an alkalinity online monitor, a hardness online monitor and a chloride ion measuring instrument.
The invention further improves that: monitoring the pH value of the circulating water by a pH monitor, monitoring the pH value in the system by a pH sensor, and giving early warning when the pH value in the system is in risk; and the pH value of the system is adjusted to be kept near a target value by controlling the acid adding amount in linkage with an acid adding pump of the system.
The invention further improves that: and by determining 3 ways of adding acid,
the method I comprises the following steps: the method is suitable for a power frequency dosing pump, is relatively direct in control and placement, and has large water quality acid-base fluctuation.
The second method comprises the following steps: the PID feeding mode is set as a PID algorithm on the premise of the former feeding mode, the closer to the high value, the higher the frequency is, and the closer to the low value is the frequency month end, the mode needs a variable frequency feeding pump, has smaller water quality acid-base, and is generally suitable for the earlier stage of self-adaptive acid feeding of circulating water or places with low requirements.
The third method comprises the following steps: and (3) self-adaptive adding, wherein the PH change condition after adding acid is tested according to the second method, a self-calibration system for adding water treatment agent is adopted to calibrate the measured output force and the acid concentration, so that 24-hour continuous adding is realized, the PH fluctuation value of the system is controlled in a smaller range, and the system operates stably.
The invention further improves that: the scale inhibitor concentration detection device monitors the circulating water in the following mode:
the first method is as follows: the scale inhibitor is added at a fixed frequency, namely the scale inhibitor is added when the frequency is lower than a set value, and the scale inhibitor is added when the frequency is higher than the set value.
The second method comprises the following steps: the PID adding mode is set as a PID algorithm on the premise of the former adding mode, the closer to the high value, the lower the frequency, the closer to the low value, the higher the frequency, the mode needs a variable frequency adding pump, the fluctuation of the water quality medicament concentration is smaller, and the method is generally suitable for the earlier stage of self-adaptive adding of the scale inhibitor to the circulating water or places with low requirements.
The third method comprises the following steps: and (3) self-adaptive adding, wherein according to the second method, the concentration change condition of the fluorescent medicament added with the scale inhibitor is tested, a self-calibration system for adding the water treatment medicament is adopted, the output of metering is calibrated, the concentration of the fluorescence intensity of the medicament is calibrated, 24-hour continuous adding is realized, and the concentration fluctuation value of the fluorescent medicament of the system is controlled in a smaller range and stably operates.
The invention further improves that: wherein, the water oxidizing bactericide in the circulating water is monitored and controlled by ORP (oxidation reduction potential) to ensure enough residual chlorine in the cooling water, and the scheme of timed impact addition is adopted to monitor whether the enough dosage is reached or not through the potential change of ORP.
The invention is further improved in that: and a DCS or PLC control system is utilized to set a weighted value for each instrument for a hardness line monitor, an alkalinity instrument line monitor, a turbidity line monitor, an ORP line monitor and a conductivity line monitor, and the scale inhibitor is added in a self-adaptive adding manner in a third adjustment mode according to the weighted value, so that more stable water quality is achieved.
The invention further improves that: the conductivity monitoring of the water quality in the circulating water is realized by arranging the conductivity detector, inputting the water replenishing conductivity and detecting the real-time conductivity of the circulating water, and the concentration multiple of the system can be calculated, so that the pollution discharge is controlled through the concentration multiple.
The invention is further improved in that: the turbidity line monitor adopts a turbidity probe to monitor the turbidity change condition of the circulating water system.
The invention is further improved in that: meanwhile, a big data remote monitoring expert system is arranged to remotely monitor the water quality change, so that problems are found in advance and accidents are avoided; and remote guidance can be provided for operators, and the operators are advised to switch the operation modes, so that the stability of the circulating water self-adaptive dosing system is ensured.
The invention has the beneficial effects that:
1. according to the scheme, 9 analysis instruments are arranged; the method has the advantages that manual measurement is reduced, an automatic instrument is adopted for measurement, data continuity is good, the water quality analysis frequency of operators is reduced, the quality of monitoring data is improved, and manual measurement is only used as an auxiliary monitoring means.
2. The scheme utilizes a PH meter and a control system to realize automatic acid feeding; the automatic acid feeding is realized, the PH of the system is maintained in a normal range, the operation of operators is reduced, and the fluctuation of the pH value caused by manual control of acid feeding is effectively avoided, so that the corrosion or scaling of the condenser is effectively avoided; .
3. The scheme utilizes an online monitor-a fluorescent medicament concentration meter to realize automatic addition of the scale inhibitor. The scale inhibitor is automatically added, the system is maintained, the operation of operators is reduced, the concentration of the medicament is stably controlled at the designed concentration, the effect of the water treatment agent is exerted to the maximum extent, and the scale inhibition and corrosion inhibition are achieved.
In the scheme, a frequency converter is used for controlling a metering pump; the medicament regulation and control are more accurate, and the self-adaptive operation is more stable.
The scheme adopts a self-calibration system for adding water treatment agent; the problem of measure output is solved, the deviation of medicament concentration is reduced, and the self-adaptive system is more stable.
Drawings
FIG. 1 is a graph showing that the pH value of sulfuric acid automatically fed by equipment is controlled and the pH value is in a stable operation state;
FIG. 2 is a graph of operation in a part of time period after the scale inhibitor is automatically added.
Detailed Description
The present invention will be further illustrated with reference to the accompanying drawings and specific embodiments, which are to be understood as merely illustrative of the invention and not as limiting the scope of the invention. It should be noted that the terms "front," "back," "left," "right," "upper" and "lower" used in the following description refer to directions in the drawings, and the terms "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.
The self-adaptive dosing method for maintaining the quality of the circulating cooling water in the embodiment utilizes an online water treatment detection device, a DCS or PLC control realization system, and manual measurement is only used as an auxiliary monitoring means; automatic acid feeding is realized, and the PH of the system is maintained in a normal range; the automatic scale inhibitor feeding is realized, the stability of the water quality of the system is maintained, and accidents are avoided; meanwhile, a big data remote monitoring expert system is arranged to remotely monitor the water quality change, so that problems are found in advance and accidents are avoided; and remote guidance can be provided for operators, and the operators are advised to switch the operation modes, so that the stability of the circulating water self-adaptive dosing system is ensured.
The online water treatment detection device comprises a pH monitor, a scale inhibitor concentration detection device, an ORP online monitor, a conductivity online monitor, a turbidity online monitor, an online corrosion rate monitor, an alkalinity online monitor, a hardness online monitor and a chloride ion measuring instrument.
(1) The on-line water treatment detection device is used for realizing the inspection of the main indexes of the water quality of the circulating water, and the on-line water treatment detection device is internally provided with the following instruments:
| serial number | Name of instrument | Specification and model | Use of |
| 1 | On-line monitor Fluorescent medicinal concentration Degree of rotation | Measuring range: 0-200ppb,220VAC supply And electric power, wherein the analog quantity is 4-20mA long distance. | Scale inhibitor concentration detection device |
| 2 | On-line monitor pH | pH range: 0 to 14; the power supply of the 220VAC is provided, the analog quantity is 4 to 20mA long distance. | The pH sensor monitors the pH value in the system, when the pH value in the system is in risk And early warning is made in advance. Acid adding pump of mixing system Linkage and acid adding amount control system pH Is maintained around the target value. |
| 3 | On-line monitor ORP | ORP range: -1500 mV ~ 1500 mV,220VAC power supply, and analog quantity of 4 to 20mA remote. | Oxidizing germicide from ORP In-situ potential) monitoring and control to ensure cooling Sufficient residual chlorine in the water, usually chlorine dioxide The scheme of time-impact addition can be realized Potential change monitoring of the ORP Sufficient dosage is achieved. |
| 4 | On-line monitor Electrical conductivity of | Measuring range of 10-10000 mu S/cm,220VAC And supplying power, wherein the analog quantity is 4-20mA long distance. | By inputting water supplement conductivity and circulating Real-time detection of conductivity of water, can be measured Calculating system concentration times, and further concentrating And (5) controlling pollution discharge by using a doubling number. |
| 5 | On-line monitor Turbidity of water | Measuring range: 0-100 NTU,220VAC power supply And electric power, wherein the analog quantity is 4-20mA long distance. | Turbidity of waterTurbidity change condition of probe monitoring system In the case of a rapid change in turbidity of the system, the turbidity often changes Indicating that the system has significant water quality wave For moving, e.g. leakage, adding anti-scaling agents An auxiliary index instrument. |
| 6 | On-line monitor- On-line corrosion rate | Measuring range: 0-5.0000 mm/a (stainless steel) Steel), 220VAC power supply, and analog quantity is 4 to 20mA remote. | Turbidity probe monitoring system turbidity change condition In the case of a rapid change in turbidity of the system, the turbidity often changes Indicating that the system has significant water quality wave With moving, e.g. leakage, addition of scale inhibitors Auxiliary index instrument |
| 7 | On-line monitor Alkalinity instrument | Measuring range: 0-,220VAC power supply, analog The amount is 4-20mA long distance. | System for expressing alkalinity and hardness in water The most important indicator of this fouling tendency is In more closely monitoring system alkalinity hardness Degree of change and influence of treatment with the agent As a result, a more efficient control system is enabled When the operation is close to the limit, the operation can still be carried out Maintains good treatment effect, and is a scale inhibitor And an added auxiliary index instrument. |
| 8 | On-line monitor Hardness of | Measuring range: 0-,220VAC power supply, analog The amount is 4-20mA long distance. | Hardness is the most important of water quality detection The target, an on-line hardness monitoring device, can have Effectively monitor calcium ions and magnesium ions in water Total content of (2), continuous water feedback system Concentration of scale-forming ions, avoiding concentration Overhigh structureScale formation problem, scale inhibition An auxiliary index instrument for adding the agent. |
| 9 | On-line monitor Chloride ion measurement Instrument for measuring the shape of a human body | Measuring range: 0-,220VAC power supply, analog The amount is 4-20mA long distance. | When the concentration multiple of the system is higher, the system is connected Near the limit of water quality treatment, a lot of water will appear The phenomenon of multiple separation of seed ion concentration, the electric conductivity is used as the concentration factor control, may not be accurate enough. By chloride ions as To solve this problem for the monitoring means Problem, by comparing the concentration of the chloride ion in the make-up water And the multiple of the concentration of the chloride ions in the circulating water, can obtain more accurate concentration multiple meter And (4) calculating. |
The equipment controls the automatic addition of sulfuric acid, and the PH operation is stable, as shown in figure 1; after the equipment is transferred to the automatic scale inhibitor feeding device, the operation curve of part of time intervals is shown as the figure 2:
in conclusion, due to long-term stable operation, the waste of the medicament is reduced to the maximum extent, the concentration range of the medicament is adjusted to be +/-1 ppm, the pH is gradually adjusted to be +/-0.1, the using amount of the water treatment agent can be reduced, and the operation cost is reduced.
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 (10)
1. The self-adaptive dosing method for maintaining the quality of the circulating cooling water is characterized by comprising the following steps of: an online water treatment detection device and a DCS or PLC control realization system are utilized, and manual measurement is only used as an auxiliary monitoring means; automatic acid feeding is realized, and the PH of the system is maintained in a normal range; the automatic scale inhibitor feeding is realized, the stable water quality of the system is maintained, and accidents are avoided.
2. The self-adaptive dosing method for maintaining the quality of the circulating cooling water according to claim 1, which is characterized in that: the online water treatment detection device comprises a pH monitor, a scale inhibitor concentration detection device, an ORP online monitor, a conductivity online monitor, a turbidity online monitor, an online corrosion rate monitor, an alkalinity online monitor, a hardness online monitor and a chloride ion measuring instrument.
3. The self-adaptive dosing method for maintaining the quality of the circulating cooling water according to claim 2, characterized in that: monitoring the pH value of the circulating water by a pH monitor, monitoring the pH value in the system by a pH sensor, and giving early warning when the pH value in the system is in risk; and the pH value of the system is adjusted to be kept near a target value by controlling the acid adding amount in linkage with an acid adding pump of the system.
4. The self-adaptive dosing method for maintaining the quality of the circulating cooling water according to claim 3, characterized in that: and 3 acid adding modes are determined, wherein the first mode is as follows: adding with fixed frequency, namely adding acid when the adding frequency is higher than a set value and stopping adding acid when the adding frequency is lower than the set value; this mode is applicable to power frequency dosing pump
The second method comprises the following steps: the PID feeding mode is set as a PID algorithm on the premise of the former feeding mode, the closer to a high value, the higher the frequency is, the closer to a low value, the lower the frequency is, the mode needs a variable frequency feeding pump, the water quality is less in acid and alkali, and the method is generally suitable for the self-adaptive acid feeding of circulating water in the earlier stage or places with low requirements;
the third method comprises the following steps: and (3) self-adaptive adding, wherein the PH change condition after adding acid is tested according to the second method, a self-calibration system for adding water treatment agent is adopted to calibrate the measured output force and the acid concentration, so that 24-hour continuous adding is realized, and the PH fluctuation value of the system is controlled in a stable range.
5. The self-adaptive dosing method for maintaining the quality of the circulating cooling water according to claim 2, characterized in that: the scale inhibitor concentration detection device monitors the circulating water in the following mode:
the first method is as follows: the scale inhibitor is added at a fixed frequency, namely the scale inhibitor is added when the frequency is lower than a set value, and the scale inhibitor is added when the frequency is higher than the set value, so that the method is suitable for a power frequency dosing pump, the control and the placement are direct, and the concentration fluctuation of the water quality medicament is large;
the second method comprises the following steps: the PID feeding mode is set as a PID algorithm on the premise of the former feeding mode, the closer to a high value, the lower the frequency, and the closer to a low value, the higher the frequency, and the mode needs a variable frequency feeding pump;
the third method comprises the following steps: and (3) self-adaptive adding, wherein according to the second method, the concentration change condition of the fluorescent medicament added with the scale inhibitor is tested, a self-calibration system for adding the water treatment medicament is adopted, the output of metering is calibrated, the concentration of the fluorescence intensity of the medicament is calibrated, the continuous adding within 24 hours is realized, and the concentration fluctuation value of the fluorescent medicament of the system is controlled within a stable range.
6. The self-adaptive dosing method for maintaining the quality of the circulating cooling water according to claim 2, characterized in that: wherein, the water quality oxidizing bactericide in the circulating water is monitored and controlled by ORP (oxidation-reduction potential) to ensure enough residual chlorine in the cooling water, and whether the sufficient dosage is reached is monitored by the potential change of ORP by adopting a scheme of timed impact addition.
7. The self-adaptive dosing method for maintaining the quality of the circulating cooling water according to claim 2, characterized in that: and a DCS or PLC control system is utilized to set a weighted value for each instrument for a hardness line monitor, an alkalinity instrument line monitor, a turbidity line monitor, an ORP line monitor and a conductivity line monitor, and the scale inhibitor is added in a self-adaptive adding manner in a third adjustment mode according to the weighted value, so that more stable water quality is achieved.
8. The self-adaptive dosing method for maintaining the quality of the circulating cooling water according to claim 2, characterized in that: the conductivity monitoring of the water quality in the circulating water is realized by arranging the conductivity detector, inputting the water replenishing conductivity and detecting the real-time conductivity of the circulating water, and the concentration multiple of the system can be calculated, so that the pollution discharge is controlled through the concentration multiple.
9. The self-adaptive dosing method for maintaining the quality of the circulating cooling water according to claim 2, characterized in that: the turbidity line monitor adopts a turbidity probe to monitor the turbidity change condition of the circulating water system.
10. The self-adaptive dosing method for maintaining the quality of the circulating cooling water according to claim 1, which is characterized in that: meanwhile, a big data remote monitoring expert system is arranged to remotely monitor the water quality change, so that problems are found in advance and accidents are avoided; and remote guidance can be provided for operators, and the operators are advised to switch the operation modes, so that the stability of the circulating water self-adaptive dosing system is ensured.
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