CN110998307B - Management system of water treatment equipment - Google Patents
Management system of water treatment equipment Download PDFInfo
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- CN110998307B CN110998307B CN201880053238.7A CN201880053238A CN110998307B CN 110998307 B CN110998307 B CN 110998307B CN 201880053238 A CN201880053238 A CN 201880053238A CN 110998307 B CN110998307 B CN 110998307B
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- value
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/416—Systems
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D11/00—Feed-water supply not provided for in other main groups
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/06—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a liquid
- G01N27/08—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a liquid which is flowing continuously
- G01N27/10—Investigation or analysis specially adapted for controlling or monitoring operations or for signalling
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/28—Electrolytic cell components
- G01N27/30—Electrodes, e.g. test electrodes; Half-cells
- G01N27/302—Electrodes, e.g. test electrodes; Half-cells pH sensitive, e.g. quinhydron, antimony or hydrogen electrodes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/14—Maintenance of water treatment installations
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Immunology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Electrochemistry (AREA)
- Pathology (AREA)
- Analytical Chemistry (AREA)
- Molecular Biology (AREA)
- Water Supply & Treatment (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Organic Chemistry (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
A management system for a water treatment facility is provided with a 1 st storage means for storing a correlation between conductivity and pH, and a management means for obtaining a theoretical pH value based on the correlation between the conductivity measured by a conductivity meter and the correlation stored in the 1 st storage means, and for issuing a signal for prompting correction of the pH meter when the theoretical pH value and a measured value of pH detected by the pH meter deviate from a predetermined value or more.
Description
Technical Field
The present invention relates to a management system for a water treatment facility such as a boiler water supply system. More particularly, the present invention relates to a management system for a water treatment facility, which manages water treatment facility by utilizing a correlation between an electric conductivity and a pH under a predetermined temperature condition.
Background
Confirmation of the degree of accuracy to which the field instrument can be secured is an important issue for improving water treatment effectiveness. In the case of a water treatment facility of a power generation boiler, pH is an important management item, and its application range is also described in JIS B8223:2015. patent document 2 describes a water supply pipe management device for a boiler, which uses a plurality of pH meters to perform mutual calibration or observe the correlation between pH values converted by conductivity meters. The management device of patent document 2 needs to prepare a plurality of pH meters and compare the values thereof. The management device of patent document 2 has a problem that the pH value itself fluctuates due to the sample temperature, and the pH value drifts. It is very difficult to adjust the amount of cooling water so as to keep the temperature of the sample water at the site constant.
Documents of the prior art
Patent documents:
patent document 1: japanese patent No. 3624941;
patent document 2: japanese patent laid-open No. 2002-349804.
Disclosure of Invention
The invention aims to provide a management system of a water treatment device, which can prevent water treatment management under the condition that the deviation of a pH meter and the correction deviation are not eliminated and can perform stable water treatment management.
A management system for a water treatment facility according to claim 1 is a management system for a water treatment facility including a pH meter and a conductivity meter, and is characterized by comprising: 1, a storage mechanism for storing the correlation between the conductivity and the pH; the 2 nd storage mechanism stores the correlation of pH and water temperature; and a control means for obtaining a theoretical pH value based on the correlation between the electrical conductivity measured by the electrical conductivity meter and the water temperature stored in the 1 st storage means, converting the pH value detected by the pH meter into a pH value at a predetermined temperature based on the correlation between the electrical conductivity measured by the electrical conductivity meter and the water temperature stored in the 2 nd storage means, and generating a signal for prompting the pH meter to correct the pH value when the theoretical pH value and the converted pH value deviate from a predetermined value or more.
A management system for a water treatment facility according to claim 2 is a management system for a water treatment facility including a conductivity meter, and is characterized by comprising: a storage means for storing a correlation between the conductivity and the pH value under a predetermined temperature condition; and a means for determining the pH value based on the correlation between the electrical conductivity measured by the electrical conductivity meter and the pH value stored in the storage means.
In one embodiment of the present invention, the predetermined temperature is 25 ℃.
In one aspect of the present invention, the water treatment facility is directed to boiler feed water.
In one aspect of the present invention, the management unit transmits a recommendation signal including adjustment of a drug injection amount or adjustment of a discharge amount.
According to the present invention, when the pH converted into the pH under the predetermined temperature condition and the pH value obtained from the electrical conductivity deviate from the predetermined value or more, the display for prompting the correction is performed, or the pH is estimated from the electrical conductivity, thereby preventing the water treatment management based on the pH measurement value having a large error and realizing the stable water treatment management.
Drawings
Fig. 1 is a block diagram showing an embodiment.
FIG. 2 is a graph showing the relationship between pH and conductivity.
Fig. 3 is a schematic diagram showing a control example.
FIG. 4 is a graph showing the relationship between pH and temperature.
Detailed Description
Hereinafter, embodiments will be described with reference to the drawings. Fig. 1 shows an example of a management system of a water treatment facility according to the present invention. In a water treatment facility (for example, a water treatment facility for a power generation boiler) 1, a basic chemical such as ammonia, a neutralizing amine, hydrazine, or the like is added and injected by a chemical injection device 2.
A pH meter, a conductivity meter, a water temperature meter, and the like are provided as a part of the field instrument 3 for managing the water quality of the water treatment facility 1, and these data are transmitted to a determination device (for example, PLC) 4. The determination device 4 is provided with a determination unit 4a, a display unit 4b, and a transmission unit 4c, converts the pH value measured by the pH meter into a pH value at a predetermined temperature, confirms that the converted pH value does not deviate from the theoretical pH value obtained from the conductivity, and transmits data to the management center 5. When the information is stored in the management center 5 and is different from the previous information, the information is compared with a phenomenon registered in the data analysis unit in advance, and advice such as adjustment of the chemical injection amount and adjustment of the boiler water discharge amount is displayed on the advice display unit 6. As the advice display unit 6, a personal computer, a portable terminal, or the like is used.
The determination unit 4a of the determination device 4 stores, for example, a pH-temperature relationship line shown in fig. 4 described later in a storage means, and when a converted pH value obtained by converting the pH value measured by the pH meter into a pH value at a predetermined temperature (ideally 25 ℃) and a theoretical pH value obtained from the conductivity of the conductivity meter are deviated from each other, the display unit 4b displays a suggestion for prompting the correction, and the same contents are also transmitted to the management center 5. Thus, the same advice display is performed also on the advice display unit 6 via the management center 5. The display may be sent by mail, or may be displayed on a specific WEB page, and the WEB page is accessed to be known.
When the pH meter in the field is deteriorated or damaged to increase an error in the measured pH value (a deviation from the theoretical pH value calculated from the conductivity of the conductivity meter), the theoretical pH value converted from the conductivity may be displayed on the display unit 4b of the determination device 4 and transmitted to the management center 5.
The correlation line between the pH value and the electric conductivity may be a correlation line under a temperature condition of 20 ℃, 30 ℃ or the like, but when water management of the boiler is considered, it is preferable to set the correlation line at 25 ℃ so as to be able to comply with JIS B8223 (2015), for example.
The electric conductivity measured by the electric conductivity meter is less affected by temperature (water temperature) than pH, and therefore, temperature conversion may not be performed, but for more accurate measurement, correction by a temperature conversion function attached to the electrode or the like is preferable.
In the present embodiment, as described above, the measured pH value of the pH meter is converted into a pH value at a predetermined temperature, and when the converted pH value and the theoretical pH value obtained from the conductivity deviate by a predetermined value or more, a correction instruction display is performed. The predetermined value of the deviation is preferably a value selected from 0.1 to 0.5, for example, 0.3, and preferably about 0.2.
The recommended display may include not only the display based on the pH meter and the conductivity meter but also the results obtained by using a smaller amount of the measuring instrument.
The signal for prompting the display of the advice for pH meter correction may be, for example, a signal transmitted together with periodic data transmitted every 1 hour, but is preferably transmitted without delay when the measured pH value deviates from the theoretical value by a predetermined value or more. In order to prevent the suggestion of prompting the correction from occurring in the correction of the pH meter, a button for prompting the correction may be provided, or a structure in which a signal prompting the correction is not emitted within a predetermined period (for example, 30 minutes) may be provided.
Examples
[ measurement example 1]
As the pH adjuster for the boiler feed water, ammonia and various amines were used. Thus, the pH and conductivity of boiler feed water to which ammonia, 3-methoxypropylamine or cyclohexylamine was added at various concentrations at 25 ℃ were measured. The relationship between the two (correlation line) is shown in fig. 2. As shown in fig. 2, the logarithmic value of the conductivity is in a linear relationship with the pH corresponding to each pH adjuster. Therefore, when the drift of the pH measurement value by the pH meter (described later in example 1) and the error by the temperature (described later in example 2) are large, the error can be eliminated or reduced by correcting the measurement value by the pH meter based on the conductivity.
Fig. 2 shows the correlation lines when only 1 of each pH adjuster was added to the boiler feed water, but similarly, when a plurality of amines and ammonia were added in combination, the correlation lines were previously obtained, and the theoretical pH value based on the electrical conductivity was obtained from the correlation lines.
Comparative example 1 and example 1
Fig. 3 shows the results of a study of a boiler using ammonia for pH adjustment of boiler feed water.
The pH meters used in comparative example 1 and example 1 have a characteristic that the pH measurement value shifts to the negative side.
The results of comparative example 1 are shown on the left half side of fig. 3. In comparative example 1, the pH meter was corrected 1 time per month as before, but no temperature conversion was performed. In comparative example 1, although the pH (measured pH value) apparently changes at a constant value because the pH does not drift in the negative direction and the amount of ammonia added increases, the ammonia concentration in the system actually increases, and there is a concern that ammonia corrosion in the condenser may occur.
The results of example 1 are shown on the right-hand side of figure 3. As shown in the figure, since the method of the present invention is controlled to have a pH of 25 ℃ converted from the electric conductivity, the actual pH is kept constant over a period of two months, and the drug infusion is controlled appropriately.
From the above, the usefulness of the method of estimating the pH value from the conductivity measurement value based on the correlation line between the pH and the conductivity measured in advance was confirmed.
[ example 2]
The temperature of the boiler feed water was varied in the range of 18 to 35 ℃ to measure the pH. The results are shown in FIG. 4. As shown in fig. 4, there is a straight line relationship between temperature and pH. Therefore, it is obvious that even the pH value measured at a temperature other than 25 ℃ can be converted to a pH value of 25 ℃ by using a conversion equation.
By controlling the injection of the drug in accordance with the pH value converted to 25 ℃, the injection amount of the drug can be adjusted more appropriately. The conversion equation in fig. 4 is as follows.
pH[at25℃]＝pH[atM℃]+(M-25)×0.035
The present invention has been described in detail using specific embodiments, but it is apparent to those skilled in the art that various modifications can be made without departing from the purpose and scope of the present invention.
The present application is based on japanese patent application 2017-172246, filed on 7.9.2017, the entire contents of which are incorporated by reference.
Description of the figures
1: a water treatment device;
4: a measuring device;
5: a management center;
6: and an advice display unit.
Claims (3)
1. A management system for a water treatment facility, which is provided with a pH meter and a conductivity meter, is characterized by comprising:
1, storing the correlation between the conductivity and the pH value;
a 2 nd storage mechanism for storing the correlation between the pH value and the water temperature; and
and a control means for obtaining a theoretical pH value based on the correlation between the electrical conductivity measured by the electrical conductivity meter and the water temperature stored in the 1 st storage means, converting the pH value detected by the pH meter into a pH value of 25 ℃ as a predetermined temperature based on the correlation between the water temperature and the electrical conductivity stored in the 2 nd storage means, and generating a signal for prompting the pH meter to correct when the theoretical pH value and the converted pH value deviate from a predetermined value selected from a range of 0.1 to 0.5 or more.
2. The management system of a water treatment apparatus according to claim 1, wherein said water treatment apparatus targets boiler feed water.
3. The management system of a water treatment apparatus according to claim 2, wherein said management means transmits an advice signal containing adjustment of an amount of injected chemical agent or adjustment of a discharge amount.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017172246A JP6471785B1 (en) | 2017-09-07 | 2017-09-07 | Management system for water treatment facilities for power generation boilers |
| JP2017-172246 | 2017-09-07 | ||
| PCT/JP2018/028581 WO2019049556A1 (en) | 2017-09-07 | 2018-07-31 | Management system of water treatment facility |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110998307A CN110998307A (en) | 2020-04-10 |
| CN110998307B true CN110998307B (en) | 2023-01-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201880053238.7A Active CN110998307B (en) | 2017-09-07 | 2018-07-31 | Management system of water treatment equipment |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JP6471785B1 (en) |
| KR (1) | KR102603844B1 (en) |
| CN (1) | CN110998307B (en) |
| TW (1) | TW201913003A (en) |
| WO (1) | WO2019049556A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111909033A (en) * | 2020-08-17 | 2020-11-10 | 日照金禾博源生化有限公司 | Method for reducing yield of weak acid in citric acid extraction process |
| CN112946027A (en) * | 2021-03-11 | 2021-06-11 | 烟台方心水处理设备有限公司 | pH on-line detection method for super-alkaline electrolyzed water |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002349804A (en) * | 2001-05-29 | 2002-12-04 | Mitsubishi Heavy Ind Ltd | Water supply management device for boiler, water supply control method for boiler and water supply management method for boiler |
| CN101045572A (en) * | 2006-03-31 | 2007-10-03 | 栗田工业株式会社 | Treatment method and device for water system of purified water boiler |
| JP2008190969A (en) * | 2007-02-02 | 2008-08-21 | Dkk Toa Corp | Measuring device and data table setting method |
| JP2009243972A (en) * | 2008-03-28 | 2009-10-22 | Mitsubishi Heavy Ind Ltd | Water quality monitor for turbine installation and method |
| JP2011156529A (en) * | 2009-10-30 | 2011-08-18 | Mitsuyoshi Yamazaki | Flocculant injection rate determination device and flocculant injection rate control system |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3624941B2 (en) | 2000-03-17 | 2005-03-02 | 栗田工業株式会社 | Equipment management system |
| JP4873791B2 (en) * | 2001-05-21 | 2012-02-08 | 株式会社トウスイ | Electrode scale component precipitation suppression device |
| JP2008196862A (en) * | 2007-02-08 | 2008-08-28 | Toshiba Corp | System for detecting state of aggregation |
| JP2010230570A (en) * | 2009-03-27 | 2010-10-14 | Sysmex Corp | Reagent preparing apparatus and sample analyzer |
| CN102323316B (en) * | 2011-08-16 | 2013-10-30 | 浙江大学 | High-temperature high-pressure calibration device and calibration method of pH electrode |
-
2017
- 2017-09-07 JP JP2017172246A patent/JP6471785B1/en active Active
-
2018
- 2018-07-31 KR KR1020207004355A patent/KR102603844B1/en active IP Right Grant
- 2018-07-31 WO PCT/JP2018/028581 patent/WO2019049556A1/en active Application Filing
- 2018-07-31 CN CN201880053238.7A patent/CN110998307B/en active Active
- 2018-09-06 TW TW107131310A patent/TW201913003A/en unknown
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002349804A (en) * | 2001-05-29 | 2002-12-04 | Mitsubishi Heavy Ind Ltd | Water supply management device for boiler, water supply control method for boiler and water supply management method for boiler |
| CN101045572A (en) * | 2006-03-31 | 2007-10-03 | 栗田工业株式会社 | Treatment method and device for water system of purified water boiler |
| JP2008190969A (en) * | 2007-02-02 | 2008-08-21 | Dkk Toa Corp | Measuring device and data table setting method |
| JP2009243972A (en) * | 2008-03-28 | 2009-10-22 | Mitsubishi Heavy Ind Ltd | Water quality monitor for turbine installation and method |
| JP2011156529A (en) * | 2009-10-30 | 2011-08-18 | Mitsuyoshi Yamazaki | Flocculant injection rate determination device and flocculant injection rate control system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110998307A (en) | 2020-04-10 |
| JP6471785B1 (en) | 2019-02-20 |
| JP2019045455A (en) | 2019-03-22 |
| WO2019049556A1 (en) | 2019-03-14 |
| KR20200050951A (en) | 2020-05-12 |
| TW201913003A (en) | 2019-04-01 |
| KR102603844B1 (en) | 2023-11-17 |
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