KR20090018741A - A method and apparatus for monitoring hydrogen leakage into the generator stator cooling water system - Google Patents
A method and apparatus for monitoring hydrogen leakage into the generator stator cooling water system Download PDFInfo
- Publication number
- KR20090018741A KR20090018741A KR1020070083075A KR20070083075A KR20090018741A KR 20090018741 A KR20090018741 A KR 20090018741A KR 1020070083075 A KR1020070083075 A KR 1020070083075A KR 20070083075 A KR20070083075 A KR 20070083075A KR 20090018741 A KR20090018741 A KR 20090018741A
- Authority
- KR
- South Korea
- Prior art keywords
- hydrogen gas
- hydrogen
- cooling water
- storage tank
- stator cooling
- Prior art date
Links
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 76
- 239000000498 cooling water Substances 0.000 title claims abstract description 28
- 239000001257 hydrogen Substances 0.000 title claims abstract description 24
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000012544 monitoring process Methods 0.000 title claims abstract description 11
- 238000001816 cooling Methods 0.000 claims abstract description 18
- 150000002431 hydrogen Chemical class 0.000 claims abstract description 3
- 239000002826 coolant Substances 0.000 abstract description 18
- 239000007789 gas Substances 0.000 abstract description 9
- 230000007797 corrosion Effects 0.000 abstract description 6
- 238000005260 corrosion Methods 0.000 abstract description 6
- 238000001514 detection method Methods 0.000 abstract description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000004880 explosion Methods 0.000 description 3
- -1 hydrogen ions Chemical class 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 238000012806 monitoring device Methods 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000002360 explosive Substances 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000007664 blowing Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000003292 diminished effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/02—Details of the control
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/04—Control effected upon non-electric prime mover and dependent upon electric output value of the generator
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/34—Hydrogen distribution
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Motor Or Generator Cooling System (AREA)
Abstract
The present invention relates to a method and apparatus for monitoring the leakage of hydrogen gas, which is used for cooling the rotor, into a stator cooling water system in a generator, which is one of the core facilities of a large capacity power plant, and more specifically, a pinhole by corrosion in the stator cooling water system. If there is a gap or a gap is created, hydrogen gas leaking to the coolant side is discharged to the upper space in the coolant storage tank through the electrochemical hydrogen sensor to detect the hydrogen gas in the air above the coolant storage tank. It's about how to monitor for leaks.
To this end, in the present invention, in detecting hydrogen gas leaking into the stator cooling water system, circulating air in the upper surface of the cooling water storage tank with an air pump to flow into the hydrogen gas detection device, and hydrogen gas in the circulating gas is electrochemical hydrogen. Detecting gas flow rate, detecting flow rate of air to the cooling water storage tank exhaust port, receiving signals from hydrogen gas sensor and flow meter, calculating gas concentration and flow rate, calculating and displaying leakage amount, and hydrogen concentration If exceeded is characterized in that the step consisting of an alarm.
Description
The present invention relates to a method and apparatus for monitoring the leakage of hydrogen gas, which is used for cooling the rotor, into a stator cooling water system in a generator, which is one of the core facilities of a large capacity power plant, and more specifically, a pinhole due to corrosion in the stator cooling water system. If the connection part is loosened or there is a gap, hydrogen gas leaking to the coolant side escapes to the upper space in the coolant storage tank through the electrochemical hydrogen sensor. It is about a method.
Hydrogen gas is used to remove the heat generated from the rotor coil in the large-capacity generator to suppress the deterioration of the insulating material. Hydrogen gas has a low density, low windage (loss caused by friction with surrounding gaseous material when the rotor rotates), high specific heat and high thermal conductivity, and suitable for removing heat generated from a rotor coil rotating at high speed. Gas.
In the generator, the rotor and the stator are located in the same space, so if there is a pinhole due to corrosion in the cooling water system used for cooling the stator coil or a gap in the seam, hydrogen gas leaks through the stator cooling water system.
Hydrogen gas has a wide explosive range, low explosion rate and low ignition grade, and is a gas that is highly explosive. Hydrogen gas leaked into a fixed cooling water system may be stagnant in a power plant and cause an explosion. In addition, when the coolant flows into the generator through the hydrogen leakage site, insulation may be degraded, which may cause a short-circuit accident.It may be stagnant in the upper part of the stator coolant tank, preventing the coolant from contacting the air, thereby lowering dissolved oxygen in the coolant to promote corrosion. Sometimes.
Therefore, it is necessary to constantly monitor the hydrogen system in the cooling system of the large capacity generator to prevent leakage of hydrogen gas into the cooling water system.
Currently, the method used to monitor the hydrogen gas leaking into the generator stator cooling system is to extract the hydrogen gas from the cooling water by blowing a certain amount of air from the lower part of the cooling water tank of the generator stator cooling system, and then conduct the hydrogen gas discharged with the injected air. Detection method (trade name SLMS, developed by GE Corporation, USA). This method must adjust the amount of air injected according to the amount of hydrogen gas leaked out. In other words, if the amount of injected air is too small compared to the amount of leaked hydrogen gas, the concentration of hydrogen gas is too high, and the measurement range of the sensor is exceeded. If the amount of injected air is too high, the concentration of hydrogen gas is diminished, making detection difficult. In addition, since the flow rate of the injected air and the flow rate of the hydrogen gas detection sensor must be precisely controlled, it is difficult to maintain the operation.
Literature Information of the Prior Art
[1] stator leackage monitoring system, GE, USA
The present invention monitors the leakage of hydrogen gas used for cooling in a large-capacity generator to the stator cooling water system to prevent an explosion accident caused by leaking hydrogen gas, and prevents the cooling water from flowing into the generator to reduce insulation. It is an object of the present invention to provide a method of suppressing corrosion of a stator cooling system.
Circulating air in the upper portion of the coolant storage tank with an air pump into the detector, detecting hydrogen gas in the circulating air with an electrochemical hydrogen gas sensor, detecting a flow rate of air exiting the cooling water storage tank exhaust port, and hydrogen gas sensor It is characterized by consisting of receiving a signal from the flow meter and calculating the gas concentration and flow rate, calculating and displaying the leak amount, and issuing an alarm when the leak amount exceeds a certain value.
The present invention is a method for detecting the hydrogen gas leaked into the large-capacity generator stator cooling water system is not only easy to install and operate the device, but also has high detection sensitivity to monitor the hydrogen gas leaking into the generator stator cooling water system with high sensitivity to leak hydrogen gas. It is possible to prevent accidents caused by the coolant, to prevent the coolant from being introduced into the generator to lower the insulation, or to prevent corrosion from being accelerated due to the decrease of oxygen concentration in the coolant by the leaking hydrogen.
Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
1 is a configuration diagram of a device for monitoring the hydrogen gas leaked into the generator stator cooling water system, the cooling
The electrochemical hydrogen gas sensor used to detect hydrogen gas in the air is a two-electrode type consisting of two electrodes of anode (working electrode) and cathode (counter electrode), but there is a comparison electrode between the two electrodes so that the potential of anode is constant Three-electrode types can be used that are retained. In both types of hydrogen gas sensors, hydrogen gas is oxidized at the anode and becomes hydrogen ions (H + ), releasing two electrons. At the same time, oxygen entering through the air hole at the cathode (the cathode) is moved from the anode through the external circuit. is a - receive an e-hydroxyl ions (OH) by a reducing reaction. Hydrogen ions and hydroxyl ions produced at the anode react to form water.
H 2 2H + + 2e -
(One)
2e - + 1 / 2O 2 + H 2 O 2OH - (2)
2H + + 2OH - 2H 2 O
(3)
At this time, the current flowing through the secondary circuit is proportional to the hydrogen concentration, so the hydrogen concentration can be known by measuring the current.
The amount of leaked hydrogen (l / day) is calculated from the following relationship.
Leakage hydrogen gas (ℓ / day) = Exhaust air volume (ℓ / hr) × Hydrogen gas concentration (vppm, ㎖ / ㎘) × 24 hr / day
In order to find out the performance of the method for monitoring the leakage hydrogen of the generator stator cooling system of the present invention was configured and tested the test apparatus as shown in FIG. Open the
1 is a block diagram of a generator stator cooling system leak hydrogen monitoring device
2 is a configuration diagram of a performance tester of the generator stator cooling system leakage hydrogen monitoring device
3 is a performance test result of the generator stator cooling system leakage hydrogen monitoring device
Claims (5)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020070083075A KR20090018741A (en) | 2007-08-18 | 2007-08-18 | A method and apparatus for monitoring hydrogen leakage into the generator stator cooling water system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020070083075A KR20090018741A (en) | 2007-08-18 | 2007-08-18 | A method and apparatus for monitoring hydrogen leakage into the generator stator cooling water system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| KR20090018741A true KR20090018741A (en) | 2009-02-23 |
Family
ID=40686851
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1020070083075A KR20090018741A (en) | 2007-08-18 | 2007-08-18 | A method and apparatus for monitoring hydrogen leakage into the generator stator cooling water system |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR20090018741A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101345099B1 (en) * | 2012-05-30 | 2013-12-31 | 파워켐텍 주식회사 | An apparatus for monitoring fault of air-cooled rotary machine |
| CN105043693A (en) * | 2015-06-05 | 2015-11-11 | 河南省日立信股份有限公司 | Water-containing small-port container gas leakage rate detection apparatus and detection method |
| CN117405308A (en) * | 2023-12-15 | 2024-01-16 | 浙江大学 | Hydrogen leakage positioning system and positioning method |
-
2007
- 2007-08-18 KR KR1020070083075A patent/KR20090018741A/en not_active Application Discontinuation
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101345099B1 (en) * | 2012-05-30 | 2013-12-31 | 파워켐텍 주식회사 | An apparatus for monitoring fault of air-cooled rotary machine |
| CN105043693A (en) * | 2015-06-05 | 2015-11-11 | 河南省日立信股份有限公司 | Water-containing small-port container gas leakage rate detection apparatus and detection method |
| CN105043693B (en) * | 2015-06-05 | 2018-01-12 | 河南省日立信股份有限公司 | Quantity of gas leakage detection means and detection method in aqueous small mouth container |
| CN117405308A (en) * | 2023-12-15 | 2024-01-16 | 浙江大学 | Hydrogen leakage positioning system and positioning method |
| CN117405308B (en) * | 2023-12-15 | 2024-03-26 | 浙江大学 | Hydrogen leakage positioning system and positioning method |
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