CN113219023A - Method and system for monitoring failure of online dissolved oxygen meter sensor - Google Patents
Method and system for monitoring failure of online dissolved oxygen meter sensor Download PDFInfo
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- CN113219023A CN113219023A CN202110462435.8A CN202110462435A CN113219023A CN 113219023 A CN113219023 A CN 113219023A CN 202110462435 A CN202110462435 A CN 202110462435A CN 113219023 A CN113219023 A CN 113219023A
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- dissolved oxygen
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 108
- 239000001301 oxygen Substances 0.000 title claims abstract description 108
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 108
- 238000012544 monitoring process Methods 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000005259 measurement Methods 0.000 claims description 18
- 238000003969 polarography Methods 0.000 claims description 3
- 230000032683 aging Effects 0.000 claims description 2
- 239000003792 electrolyte Substances 0.000 abstract description 16
- 239000012528 membrane Substances 0.000 abstract description 10
- 239000000463 material Substances 0.000 abstract description 4
- 238000012423 maintenance Methods 0.000 abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 6
- 150000002500 ions Chemical class 0.000 description 5
- 238000007254 oxidation reaction Methods 0.000 description 5
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 229910052709 silver Inorganic materials 0.000 description 4
- 239000004332 silver Substances 0.000 description 4
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 3
- 229910052737 gold Inorganic materials 0.000 description 3
- 239000010931 gold Substances 0.000 description 3
- 230000002209 hydrophobic effect Effects 0.000 description 3
- 229910052697 platinum Inorganic materials 0.000 description 3
- 101100520231 Caenorhabditis elegans plc-3 gene Proteins 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003487 electrochemical reaction Methods 0.000 description 2
- 229910000510 noble metal Inorganic materials 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 238000006722 reduction reaction Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
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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
- G01N27/28—Electrolytic cell components
- G01N27/30—Electrodes, e.g. test electrodes; Half-cells
-
- 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
- G01N27/48—Systems using polarography, i.e. measuring changes in current under a slowly-varying voltage
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Physics & Mathematics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Molecular Biology (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Measuring Oxygen Concentration In Cells (AREA)
Abstract
The invention discloses a method and a system for monitoring the failure of an online dissolved oxygen meter sensor.A measured value A of the online dissolved oxygen meter sensor is less than or equal to a minimum preset measured value, all measured values in a set time period after the measured value A are obtained, and when a plurality of measured values in the set time period are greater than the maximum preset measured value, the online dissolved oxygen meter sensor is judged to be failed; the monitoring method can timely and accurately monitor the failure of the dissolved oxygen sensor, guarantee the accuracy of the dissolved oxygen meter, provide the basis for replacing the electrolyte and the membrane for the maintenance personnel of the meter, and save the cost of labor materials.
Description
Technical Field
The invention relates to the field of on-line chemical instrument measurement of a water vapor circulation system of a power plant, in particular to a method and a system for monitoring the failure of an on-line dissolved oxygen meter sensor.
Background
Accurate control of dissolved oxygen is an important means to prevent corrosion, scaling and salt accumulation in power plant thermal equipment. For a unit for the complete volatilization treatment of the feed water, the dissolved oxygen of the feed water is generally controlled to be less than 10 mug/L, otherwise, the corrosion of metal can be caused; for the unit for adding oxygen to the water, the dissolved oxygen must be controlled within a certain range to achieve the expected anticorrosion effect. To achieve this, the concentration of dissolved oxygen in the water vapor system must be accurately measured. Therefore, the accurate measurement of the dissolved oxygen in the water vapor system has important significance for the safe operation of the unit. The monitoring of the dissolved oxygen in the power plant mainly depends on an online dissolved oxygen meter, and the working error of the dissolved oxygen meter must meet the regulations in the electric power industry standard DL/T677-. The necessary condition for the operating error to be within the specified range is that the dissolved oxygen sensor does not fail.
At present, the online dissolved oxygen meter measuring method is mainly a polarography. The polarographic dissolved oxygen meter is an amperometric analyzer, and the dissolved oxygen sensor consists of two metal electrodes which are in contact with a built-in electrolyte and a hydrophobic breathable film. Such membranes allow oxygen and other gases to pass through without passing water and other dissolved species. The cathode of the sensor is made of noble metal platinum or gold, and the anode is made of silver. When a DC polarization voltage V is applied between the electrodes, oxygen continuously diffuses through the membrane, the oxygen diffusing through the membrane is immediately reduced on the surface of the platinum or gold electrode, and the reaction current is proportional to the concentration of oxygen diffusing to the cathode. The silver electrode undergoes an oxidation reaction, so that the dissolved oxygen meter consumes Cl in the electrolyte during operation-Ion, if Cl-The ion is about to be exhausted, i.e. the dissolved oxygen sensor fails.
The traditional method for ensuring that the dissolved oxygen sensor does not lose efficacy is to regularly replace the electrolyte and the membrane of the sensor. Thus, it is possible that the sensor does not fail and the electrolyte and membrane are replaced, increasing labor and material costs.
Disclosure of Invention
In order to timely and accurately monitor the failure of the dissolved oxygen meter sensor, the invention provides the online dissolved oxygen meter sensor failure monitoring method and system.
The invention is realized by the following technical scheme:
a monitoring method for failure of an online dissolved oxygen meter sensor is characterized in that when a measured value A of the online dissolved oxygen meter sensor is smaller than or equal to a minimum preset measured value, all measured values in a set time period after the measured value A are obtained, and when a plurality of measured values in the set time period are larger than the maximum preset measured value, the online dissolved oxygen meter sensor is judged to be failed.
Preferably, the minimum predetermined measurement is 0-0.2 μ g/L.
Preferably, the maximum predetermined measurement value is 200-1000. mu.g/L.
Preferably, the set time period in step 1 is 2 to 10 minutes.
Preferably, the plurality of measurement values in the set period of time is 3 measurement values.
Preferably, when the measured value in the set time period is always smaller than the minimum preset measured value, the aging of the anode of the online dissolved oxygen meter sensor is judged.
A monitoring system for failure of an on-line dissolved oxygen meter sensor comprises a dissolved oxygen transmitter, a dissolved oxygen sensor and a controller;
the dissolved oxygen sensor is connected with the dissolved oxygen transmitter, the dissolved oxygen transmitter is connected with the controller, and the dissolved oxygen transmitter is used for receiving the measurement signal of the dissolved oxygen sensor and converting the measurement signal into a measurement value.
The controller is used for receiving the measured value sent by the dissolved oxygen transmitter and outputting the state of the dissolved oxygen meter sensor according to the monitoring method.
Preferably, the dissolved oxygen meter sensor is a polarography sensor.
Preferably, the controller is a PLC.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention provides a method for monitoring the failure of an online dissolved oxygen meter sensor, wherein the dissolved oxygen meter consumes Cl in electrolyte during operation-Ion when Cl-The ion is about to exhaust, and the anode is not contacted with Cl-When ions are generated, the anode can not generate oxidation reaction, no current is generated, at the moment, the measured value is 0 mug/L or very small, the measured value is abnormal, the measured value at the moment is taken as a demarcation point, the measured value at the moment is taken as a judgment standard, meanwhile, when the anode can not generate oxidation reaction, the cathode can not generate reduction reaction, and O is generated2O which is not consumed and enters the inside of the electrode through the gas permeable membrane2Then, a large amount of the electrolyte is accumulated, and when the anode electrode is contacted with Cl-When ionic, electrochemical reaction occurs due to a large amount of O accumulated in the electrolyte2And when the plurality of measured values in the time period are greater than the maximum preset measured value, the situation that the electrolyte in the dissolved oxygen sensor is about to be exhausted, namely the dissolved oxygen sensor fails, can be judged. The monitoring method can timely and accurately monitor the failure of the dissolved oxygen sensor, guarantee the accuracy of the dissolved oxygen meter, provide the basis for replacing the electrolyte and the membrane for the maintenance personnel of the meter, and save the cost of labor materials.
Drawings
FIG. 1 is a schematic diagram of a disabling system according to the present invention;
FIG. 2 is a graph showing the measured values of dissolved oxygen in example 1 of the present invention.
The system comprises a dissolved oxygen transmitter 1, a dissolved oxygen sensor 2, a dissolved oxygen sensor 3 and a PLC controller.
Detailed Description
The present invention will now be described in further detail with reference to the attached drawings, which are illustrative, but not limiting, of the present invention.
A monitoring method for failure of an online dissolved oxygen meter sensor is characterized in that when a measured value A of the online dissolved oxygen meter sensor is smaller than or equal to a minimum preset measured value, all measured values in a set time period after the measured value A are obtained, and when a plurality of measured values in the set time period are larger than the maximum preset measured value, the online dissolved oxygen meter sensor is judged to be failed.
Specifically, the minimum predetermined measurement value is 0 to 0.2. mu.g/L.
And setting a maximum preset measurement value according to the measurement working condition of the online dissolved oxygen meter sensor, wherein the maximum preset measurement value is 200-.
The measured value 2-10 minutes after the moment of the measured value a is obtained and compared with the maximum preset measured value.
Further, in order to ensure the monitoring accuracy, when at least 3 measured values in a set time period are greater than the maximum preset measured value, the dissolved oxygen meter sensor is determined to be failed.
And when the measured value in the set time period is always smaller than the minimum preset measured value, judging that the anode of the online dissolved oxygen meter sensor is aged.
The online dissolved oxygen meter is a polarographic dissolved oxygen meter.
The working principle of the monitoring method of the invention is as follows:
the polarographic dissolved oxygen meter is an amperometric analysis meter, and a dissolved oxygen sensor consists of two metal electrodes which are in contact with a built-in electrolyte and a hydrophobic breathable film, wherein the two metal electrodes are respectively a cathode electrode and an anode electrode, and the hydrophobic breathable film can allow oxygen and other gases to permeate through without allowing water and other soluble substances to pass through. The negative electrode of the sensor is made of noble metal platinum or gold, and the positive electrode is made of silver. When a direct-current polarization voltage V is applied between the two electrodes, oxygen continuously diffuses through the breathable film, the oxygen diffused through the breathable film is immediately reduced on the surface of the cathode electrode, the reaction current is in direct proportion to the oxygen concentration diffused to the cathode, and the silver electrode undergoes an oxidation reaction, which specifically comprises the following steps:
the reduction reaction of the cathode electrode is
O2+4H++4e-＝2H2O
The oxidation reaction of the anode is
4Ag+4Cl--4e-＝4AgCl↓
Thus, the dissolved oxygen meter consumes Cl in the electrolyte during operation-Ion when Cl-The ion is about to exhaust, and the anode is not contacted with Cl-When ions are generated, the anode is not oxidized and no current is generated, and at this time, the measured value is 0 μ g/L or less, that is, the above-mentioned minimum predetermined measured value, and at the same time, the cathode is not reduced, so that O is generated2O which is not consumed and enters the inside of the electrode through the gas permeable membrane2Then, a large amount of the electrolyte is accumulated, and when the anode electrode is contacted with Cl-When ionic, electrochemical reaction occurs due to a large amount of O accumulated in the electrolyte2The measured value will be large. Therefore, the electrolyte in the dissolved oxygen sensor is about to be exhausted according to the repeated jump of the dissolved oxygen measured value between 0 and the maximum value, namely the dissolved oxygen sensor is failed.
The monitoring system and the monitoring method can timely and accurately monitor the failure of the dissolved oxygen sensor and provide guarantee for the accuracy of the dissolved oxygen meter; the basis of replacing the electrolyte and the membrane is provided for the maintenance personnel of the instrument, and the labor material cost is saved.
Referring to fig. 1, the system for monitoring the failure of the online dissolved oxygen meter sensor, provided by the invention, comprises a dissolved oxygen transmitter 1, a dissolved oxygen sensor 2 and a PLC controller 3.
The dissolved oxygen sensor 2 is connected with the dissolved oxygen transmitter 1, the dissolved oxygen transmitter 1 is connected with the PLC 3, and the dissolved oxygen transmitter 1 is used for receiving the measuring signal of the dissolved oxygen sensor 2 and converting the measuring signal into a measuring value.
The PLC 3 is used for receiving the measured value sent by the dissolved oxygen transmitter 1 and determining the state of the dissolved oxygen meter sensor according to the measured value.
Example 1
Taking an economizer inlet dissolved oxygen meter of a 600MW supercritical direct current furnace unit of a certain power plant as an example, when a sensor of the meter fails, a historical curve of a measured value of the dissolved oxygen at the economizer inlet in 20 minutes is shown in fig. 2, and it can be seen that after the sensor fails, the measured value of the dissolved oxygen has obvious jump in a short time, and the measured value jumps from 0 to a maximum value.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (9)
1. The method for monitoring the failure of the online dissolved oxygen meter sensor is characterized in that when a measured value A of the online dissolved oxygen meter sensor is smaller than or equal to a minimum preset measured value, all measured values in a set time period after the measured value A are obtained, and when a plurality of measured values in the set time period are larger than the maximum preset measured value, the online dissolved oxygen meter sensor is judged to be failed.
2. The method of claim 1, wherein the minimum predetermined measurement value is 0-0.2 μ g/L.
3. The method as claimed in claim 1, wherein the maximum predetermined measurement value is 200-1000 μ g/L.
4. The method for monitoring the failure of the online dissolved oxygen meter sensor as claimed in claim 1, wherein the set time period in step 1 is 2-10 minutes.
5. The method for monitoring the failure of the online dissolved oxygen meter sensor as claimed in claim 1, wherein the plurality of measured values in the set time period is 3 measured values.
6. The method for monitoring the failure of the online dissolved oxygen meter sensor as claimed in claim 5, wherein when the measured value is always less than the minimum preset measured value within the set time period, the aging of the anode of the online dissolved oxygen meter sensor is determined.
7. The monitoring system for the failure of the online dissolved oxygen meter sensor is characterized by comprising a dissolved oxygen transmitter (1), a dissolved oxygen sensor (2) and a controller (3);
the dissolved oxygen sensor (2) is connected with the dissolved oxygen transmitter (1), the dissolved oxygen transmitter (1) is connected with the controller (3), and the dissolved oxygen transmitter (1) is used for receiving a measurement signal of the dissolved oxygen sensor (2) and converting the measurement signal into a measurement value;
the controller (3) is used for receiving the measured value sent by the dissolved oxygen transmitter (1) and outputting the state of the dissolved oxygen meter sensor according to the monitoring method of any one of claims 1-6.
8. The system for monitoring the failure of the online dissolved oxygen meter sensor according to claim 7, wherein the dissolved oxygen meter sensor is a polarography sensor.
9. The system for monitoring the failure of the online dissolved oxygen meter sensor according to claim 7, wherein the controller (3) is a PLC.
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| CN202110462435.8A CN113219023A (en) | 2021-04-27 | 2021-04-27 | Method and system for monitoring failure of online dissolved oxygen meter sensor |
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| CN202110462435.8A CN113219023A (en) | 2021-04-27 | 2021-04-27 | Method and system for monitoring failure of online dissolved oxygen meter sensor |
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Application publication date: 20210806 |