CN106006910A - Method for monitoring and controlling copper lead corrosion in stator cooling water of generator - Google Patents
Method for monitoring and controlling copper lead corrosion in stator cooling water of generator Download PDFInfo
- Publication number
- CN106006910A CN106006910A CN201610570441.4A CN201610570441A CN106006910A CN 106006910 A CN106006910 A CN 106006910A CN 201610570441 A CN201610570441 A CN 201610570441A CN 106006910 A CN106006910 A CN 106006910A
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- Prior art keywords
- conductivity
- cooling water
- stator cooling
- water
- electrical conductivity
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Classifications
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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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/02—Non-contaminated water, e.g. for industrial water supply
- C02F2103/023—Water in cooling circuits
Abstract
The invention discloses a method for monitoring and controlling copper lead corrosion in stator cooling water of a generator, comprising the following steps: 1), monitoring online water quality hydrogen conductivity and electrical conductivity of stator cooling water of the generator, and monitoring copper content in the stator cooling water by intermittent sampling; 2), according to a fitting formula, acquiring corresponding pH theoretical values from the hydrogen conductivity and electrical conductivity; 3), according to the copper content and the pH theoretical values, adjusting the water quality hydrogen conductivity and electrical conductivity, and controlling pH theoretical values of the stator cooling water to control the corrosion of copper leads in the stator cooling water. The water quality hydrogen conductivity and electrical conductivity of the stator cooling water of the generator are monitored online, pH theoretical values are obtained according to the fitting formula, and the water quality hydrogen conductivity and electrical conductivity are adjusted to control copper lead corrosion in the stator cooling water; the copper content in the stator cooling water is monitored by intermittent sampling to monitor the corrosion condition of copper leads in the stator cooling water.
Description
Technical field:
The invention belongs to power plant chemistry technical field, be specifically related to a kind of in generator stator cooling water
The method that copper conductor corrosion is monitored and controlled.
Background technology:
Recently as Large Copacity, the putting into operation, due to Generator Stator Cooling water of high parameter generating set
(be called for short determine cold water) makees cooling medium in high voltage electric field, therefore to the requirement of generator stator cooling water quality also
More and more higher, in the case of ensureing premised on engine health, economical operation, to determining cold water Water-quality control
Propose the strict demand of following three aspects.1. insulation: have enough insulating properties, the most of a sufficiently low conductance
Rate.2. anticorrosion: require the lowest to the corrosivity of electromotor tubular copper conductor, this is also that generation current machine is fixed
Chilled water system main problem present in the actual motion.3. antiscale: do not allow in generator stator cooling water
Copper corrosion product deposits in tubular copper conductor.
According to the general requirement of above three aspects, power industry is according to related basic research and on-the-spot actual motion
Situation has made on-line monitoring generator stator cooling water water electric conductivity, pH value, and cold water is determined in backlash sampling monitoring
The monitoring and control method of copper content.
(1) electrical conductivity.Control to determine the purpose of cold water electrical conductivity and have two: first, prevent generator coil because of
Determine that cold water electrical conductivity is too high causes leakage current；Second, controlled the content of water intermediate ion by electrical conductivity, enter
And control water quality, prevent corrosion.
(2) pH value.In generator stator cooling water system, in air, dissolving in of oxygen causes copper conductor to corrode,
And the dissolving in cause and determine the corrosion that pH in cold water reduces and then is further exacerbated by copper conductor of Carbon Dioxide in Air,
So that control pH to reduce the corrosion of copper conductor.And in a sense it can be said that determine the pH of cold water
Value determines the extent of corrosion size determining cold water to copper cash rod, it is therefore desirable to the pH value of cold water is determined in artificial control
To reduce copper conductor corrosion.
(3) copper content.Determine the monitoring of copper content in cold water, be generator stator cooling water important content of supervision it
One.It directly reflects the corrosion condition of copper cash rod, illustrates the process of water quality and controls effect, and weighing
Whether copper corrosion product can deposit, and can point out prevention its generator windings local overheating caused.
Research finds, determines in cold water Monitoring and Controlling index existing, and overwhelming majority power plant all uses online prison
Survey electrical conductivity and pH value index, the monitoring and control method of backlash sampling monitoring copper content index.But it is existing fixed
In cold water monitoring method, due to online pH table by pure aquatic system streaming potential, liquid junction potential, temperature serious
Impact, there is certain inaccuracy in online pH measured value, this severe jamming power plant operations staff is to the coldest
The monitoring of water, causes operations staff to produce distrust to determining cold water pH measured value.Due to hydrogen conductivity and electricity
The measurement error of conductance is all much lower than the measurement error of pH value, has the highest accuracy.It is proposed that
Cancel pH value index, increase hydrogen conductivity index, determine the corrosive index of cold water as one monitoring,
Show that corresponding pH theoretical value substitutes with hydrogen conductivity and electrical conductivity according to matching formula and measure inaccurate pH survey
Value, to control to determine copper conductor corrosion in cold water.
Have seal approach such as nitrogen-filled seal measure not use owing to determining cold tanks, some water tanks also directly with
Air is connected so that Carbon Dioxide in Air is constantly dissolved in and determined in cold water, causes hydrogen conductivity to raise, and real
Test room result of study and show that determining the rising of hydrogen conductivity in cold water is disadvantageous to the anticorrosion determining cold water copper conductor.
Propose to increase hydrogen conductivity index, also can intuitively characterize and monitor the amount of dissolving in of carbon dioxide in cold water of determining, with
The corrosivity of cold water is determined in monitoring.
Summary of the invention:
It is an object of the invention to provide a kind of in generator stator cooling water be monitored and controlled copper conductor corrosion
Method, i.e. on-line monitoring generator stator cooling water water quality hydrogen conductivity and electrical conductivity, the pH drawn according to matching formula
Theoretical value, adjusts water quality hydrogen conductivity and electrical conductivity, controls to determine copper conductor corrosion in cold water；Backlash sampling is supervised
Measure copper content in cold water and determine the corrosion condition of copper conductor in cold water with monitoring.
For reaching above-mentioned purpose, the present invention adopts the following technical scheme that and realizes:
A kind of method that copper conductor corrosion is monitored and controlled in generator stator cooling water, comprises the following steps:
1) on-line monitoring generator stator cooling water water quality hydrogen conductivity and electrical conductivity, backlash sampling monitoring is determined in cold water
Copper content；
2) corresponding pH theoretical value is drawn by hydrogen conductivity and electrical conductivity according to matching formula；
3) according to copper content and pH theoretical value, water quality hydrogen conductivity and electrical conductivity are adjusted, by determining cold water
The control of middle pH theoretical value is to reach determining the control of copper conductor corrosion in cold water.
The present invention is further improved by, and the water sample of on-line monitoring and backlash sampling is generator stator cooling water
Water inlet.
The present invention is further improved by, step 2) in, hydrogen conductivity and electrical conductivity according to matching formula carry
Go out process as follows:
201) according to basifier system NaOH or NH3, by Kohlrausch ion law of independent migration, logical
Cross limiting molar conductivity and calculated the conductivity value of correspondence by certain hydrogen conductivity and pH value；
202) data base containing mass data that hydrogen conductivity, pH value are corresponding with electrical conductivity is made, its
Middle pH value difference as little as ± 0.01；
203) data base being made up of three values makes 3 dimensional drawing, thus proposes matching formula.
The present invention is further improved by, step 3) in, adjust water quality hydrogen conductivity and the method for electrical conductivity
It is: reduce hydrogen conductivity, rise high conductivity, thus improve pH value, reach the control determining cold water copper content,
I.e. control the corrosion of copper conductor.
The generator stator cooling water control method that the present invention provides can reach following compared with original control method
Good effect:
1, the hydrogen conductivity index and the conductivity indices that use are more much lower than the measurement error of pH index, have
The highest accuracy；
2, use hydrogen conductivity and electrical conductivity to draw corresponding pH theoretical value according to matching formula, fundamentally disappear
Measure great inaccuracy except determining pH value in cold water, eliminate staff's not believing pH measured value
Appoint sense；
3, use hydrogen conductivity monitoring, can intuitively characterize and monitor the amount of dissolving in of carbon dioxide in cold water of determining, this
Body has also served as a kind of control and has determined the corrosive monitor control index of cold water.
Accompanying drawing illustrates:
Fig. 1 is the stream of a kind of method that copper conductor corrosion is monitored and controlled in generator stator cooling water of the present invention
Cheng Tu.
Detailed description of the invention:
Below in conjunction with embodiment, the present invention is further described in detail.
Embodiment:
South China 1000MW unit, the generator stator cooling water former monitoring method of employing: on-line monitoring conductance
Rate is 0.083 μ S/cm, and on-line monitoring pH measured value is 7.65, and backlash sampling monitoring is determined copper content in cold water and is
8.90μg/L.Although copper content reaches standard gauge provisioning request, but owing to using new monitoring method to find: online
It is 0.103 μ S/cm that cold water hydrogen conductivity is determined in monitoring, according to Kohlrausch ion law of independent migration, passes through
Limiting molar conductivity and calculating pH theoretical value matching formula calculate pH theoretical value 7.43, and supervise online
Surveying pH measured value is 7.65, differs-0.22 with theoretical value, hence it is evident that allow domain of walker (± 0.05) beyond standard,
(measured value is by pure aquatic system streaming potential, liquid junction potential, temperature to online pH table to cause power plant operations staff
Having a strong impact on of degree) produce serious distrust, cause the corrosion that cannot accurately control to determine cold water copper conductor.
After using new monitoring method, adjust water quality hydrogen conductivity and electrical conductivity, improve and determine H-OH type in chilled water system
The process water yield of little mixed bed, reduces hydrogen conductivity, increases moisturizing ammon amount, improves electrical conductivity, thus improves
Determine the pH value of cold water, to have reduced the purpose (i.e. controlling the corrosion of copper conductor) determining cold water copper content.
Therefore the present invention determines, according to firepower electrical plant electromotor high-rating generator, the theory that cold water investigational data is made
Analyze and experimental study achievement, it is proposed that a kind of monitoring and control in the generator stator cooling water of thermal power plant
The method of copper conductor corrosion.Described monitoring and control method is: on-line monitoring generator stator cooling water water quality hydrogen electricity
Conductance and electrical conductivity, the pH theoretical value drawn according to matching formula, adjust water quality hydrogen conductivity and electrical conductivity, control
Formulate copper conductor corrosion in cold water；Backlash sampling monitoring is determined copper content in cold water and is determined copper conductor in cold water with monitoring
Corrosion condition.
The measurement error of hydrogen conductivity and electrical conductivity is all much lower than the measurement error of pH value, has the highest standard
Really property；Hydrogen conductivity determines the corrosive index of cold water as one monitoring, can intuitively characterize and monitor and determine cold water
The amount of dissolving in of middle carbon dioxide；Corresponding pH theoretical value is drawn according to matching formula by hydrogen conductivity and electrical conductivity,
It is inherently eliminated and has determined the great inaccuracy of pH value measurement in cold water, eliminated staff and pH is surveyed
The distrust of value；Adjust water quality hydrogen conductivity and electrical conductivity, by determining the control of pH theoretical value in cold water
Make to reach determining the control of copper conductor corrosion in cold water；Backlash sampling monitoring determines in cold water copper content to reach
To determining the monitoring of copper conductor corrosion condition in cold water.This is a kind of new monitoring and control method.
The purpose of the method has following 2 points: 1. use hydrogen conductivity and electrical conductivity to draw accordingly according to matching formula
PH theoretical value, be inherently eliminated and determined the great inaccuracy of pH measured value in cold water, eliminate work
Personnel's distrust to pH measured value, beneficially field personnel's monitoring to determining cold water water quality；2. adopt
Characterize and monitor the content of carbon dioxide in generator stator cooling water with hydrogen conductivity, cold water is determined in display directly perceived
The amount of dissolving in of middle carbon dioxide, can control to determine cold water pair by controlling the height of hydrogen conductivity to a certain extent
The corrosivity of copper conductor.Adjust water quality hydrogen conductivity and electrical conductivity, by determining the control of pH theoretical value in cold water
Make to reach determining the control of copper conductor corrosion in cold water；Backlash sampling monitoring determines in cold water copper content to reach
To determining the monitoring of copper conductor corrosion condition in cold water.
Claims (4)
1. the method that copper conductor corrosion is monitored and controlled in generator stator cooling water, it is characterised in that
Comprise the following steps:
1) on-line monitoring generator stator cooling water water quality hydrogen conductivity and electrical conductivity, backlash sampling monitoring is determined in cold water
Copper content；
2) corresponding pH theoretical value is drawn by hydrogen conductivity and electrical conductivity according to matching formula；
3) according to copper content and pH theoretical value, water quality hydrogen conductivity and electrical conductivity are adjusted, by determining cold water
The control of middle pH theoretical value is to reach determining the control of copper conductor corrosion in cold water.
The side that copper conductor corrosion is monitored and controlled in generator stator cooling water the most according to claim 1
Method, it is characterised in that the water sample of on-line monitoring and backlash sampling is the water inlet of generator stator cooling water.
The side that copper conductor corrosion is monitored and controlled in generator stator cooling water the most according to claim 1
Method, it is characterised in that step 2) in, hydrogen conductivity and electrical conductivity according to matching formula to propose process as follows:
201) according to basifier system NaOH or NH3, by Kohlrausch ion law of independent migration, logical
Cross limiting molar conductivity and calculated the conductivity value of correspondence by certain hydrogen conductivity and pH value；
202) data base containing mass data that hydrogen conductivity, pH value are corresponding with electrical conductivity is made, its
Middle pH value difference as little as ± 0.01；
203) data base being made up of three values makes 3 dimensional drawing, thus proposes matching formula.
The side that copper conductor corrosion is monitored and controlled in generator stator cooling water the most according to claim 1
Method, it is characterised in that step 3) in, the method adjusting water quality hydrogen conductivity and electrical conductivity is: reduce hydrogen electricity
Conductance, liter high conductivity, thus improve pH value, reach the control determining cold water copper content, i.e. control copper and lead
The corrosion of line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610570441.4A CN106006910B (en) | 2016-07-19 | 2016-07-19 | A method of for copper conductor corrosion to be monitored and controlled in generator stator cooling water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610570441.4A CN106006910B (en) | 2016-07-19 | 2016-07-19 | A method of for copper conductor corrosion to be monitored and controlled in generator stator cooling water |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106006910A true CN106006910A (en) | 2016-10-12 |
| CN106006910B CN106006910B (en) | 2019-01-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610570441.4A Active CN106006910B (en) | 2016-07-19 | 2016-07-19 | A method of for copper conductor corrosion to be monitored and controlled in generator stator cooling water |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112798644A (en) * | 2020-12-28 | 2021-05-14 | 武汉大学 | Film thermal resistance measuring system and method for evaluating corrosion degree and pickling and passivation effects of hollow copper conductor of generator |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3871444A (en) * | 1971-08-02 | 1975-03-18 | Beckman Instruments Inc | Water quality analysis system with multicircuit single shell heat exchanger |
| CN1354546A (en) * | 2001-12-17 | 2002-06-19 | 武汉大学 | Inner-cooling water microcirculation slowly-releasing regulation and control method and its monitoring system |
| CN1896009A (en) * | 2006-06-09 | 2007-01-17 | 江西省电力科学研究院 | Alkalescent water-quality treatment and treating system for double-internal water-cooled generator |
| CN203820508U (en) * | 2014-05-12 | 2014-09-10 | 西安热工研究院有限公司 | Internal cooling water treatment system of generator |
-
2016
- 2016-07-19 CN CN201610570441.4A patent/CN106006910B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3871444A (en) * | 1971-08-02 | 1975-03-18 | Beckman Instruments Inc | Water quality analysis system with multicircuit single shell heat exchanger |
| CN1354546A (en) * | 2001-12-17 | 2002-06-19 | 武汉大学 | Inner-cooling water microcirculation slowly-releasing regulation and control method and its monitoring system |
| CN1896009A (en) * | 2006-06-09 | 2007-01-17 | 江西省电力科学研究院 | Alkalescent water-quality treatment and treating system for double-internal water-cooled generator |
| CN203820508U (en) * | 2014-05-12 | 2014-09-10 | 西安热工研究院有限公司 | Internal cooling water treatment system of generator |
Non-Patent Citations (2)
| Title |
|---|
| 杨俊等: "二氧化碳对发电机内冷水防腐蚀控制的影响", 《腐蚀与防护》 * |
| 肖子丹等: "二氧化碳对发电机内冷水pH与电导率的影响", 《工业水处理》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112798644A (en) * | 2020-12-28 | 2021-05-14 | 武汉大学 | Film thermal resistance measuring system and method for evaluating corrosion degree and pickling and passivation effects of hollow copper conductor of generator |
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| Publication number | Publication date |
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| CN106006910B (en) | 2019-01-04 |
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