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 PDF

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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
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KR
South Korea
Prior art keywords
hydrogen gas
hydrogen
cooling water
storage tank
stator cooling
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Application number
KR1020070083075A
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Korean (ko)
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이태원
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이태원
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Application filed by 이태원 filed Critical 이태원
Priority to KR1020070083075A priority Critical patent/KR20090018741A/en
Publication of KR20090018741A publication Critical patent/KR20090018741A/en

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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02PCONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P9/00Arrangements for controlling electric generators for the purpose of obtaining a desired output
    • H02P9/02Details of the control
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02PCONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P9/00Arrangements for controlling electric generators for the purpose of obtaining a desired output
    • H02P9/04Control effected upon non-electric prime mover and dependent upon electric output value of the generator
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30Hydrogen technology
    • Y02E60/34Hydrogen distribution

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  • 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

Generator stator cooling water system {A method and apparatus for monitoring hydrogen leakage into the generator stator cooling water system}

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 water 10 of the cooling water storage tank circulates the generator stator cooling system (9). Hydrogen gas contained in the coolant returned from the generator stator coolant system is separated from the coolant and diffused into the air above the coolant storage tank. The air pump 1 is turned and the flow control valve 2 is adjusted so that a flow rate of 100 ml / min flows to the detector 4 through the flow meter 3. The air passes through the hydrogen gas sensor 5 of the detector 4 and returns to the coolant storage tank. Hydrogen gas contained in the air is detected by the electrochemical hydrogen gas sensor 5. The current signal from the hydrogen gas sensor is sent to the controller 6 and converted into a gas concentration according to the current magnitude. The exhaust flow rate measured by the exhaust air flow meter 8 installed in the cooling water storage tank exhaust port is transmitted to the controller 6, and the controller calculates the leakage amount using the hydrogen gas concentration and the outlet air flow rate and displays it on the display unit. The controller transmits a signal to the recorder 7 to record and store it, and an alarm is issued when the amount of leaked hydrogen exceeds a certain value.

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 valve 3 of the air spring 1 and let the air flow at 100 ml / min through the mass flow meter 5. Air enters the detector 6 and is discharged through the hydrogen gas sensor 7. Check that the indicated value of the controller 8 stably shows "0". When the indication indicates "0" stably, the air valve valve 3 is closed, the valve 4 of the cylinder 2 containing 1,000 ppm of hydrogen gas is opened, and the hydrogen gas flows at the same flow rate as the air. Adjust The gas concentration output of the controller 8 was transferred to the recorder 9 and stored. The test was discontinued, with the gas concentration readings increasing steadily and no longer increasing, indicating a constant value. The results are shown in FIG. After 3 minutes of standard hydrogen gas injection, the concentration of hydrogen gas began to rise, and after about 30 minutes, it reached 1,000 ppm and showed a constant value.

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)

In the apparatus for monitoring the leakage hydrogen of the generator stator cooling system, Circulating air at the top of the generator stator cooling system cooling water storage tank into the detector; Detecting hydrogen gas in the air inside the detector with an electrochemical hydrogen gas sensor, Detecting exhaust flow rate from the flow rate sensor of the cooling water storage tank exhaust port, Calculating a leaked hydrogen gas amount by receiving a signal from a detector hydrogen gas sensor and an exhaust flow sensor; Indicating the amount of leaked hydrogen gas, Generator stator cooling system leak hydrogen monitoring method and device characterized in that the step of issuing an alarm when the amount of leak hydrogen gas exceeds a certain value The method and apparatus of claim 1, wherein the hydrogen gas sensor is an electrochemical hydrogen sensor having an air supply port. The method and apparatus for monitoring leakage hydrogen of a generator stator cooling system according to claim 1, wherein the detector has a circulation pump for circulating air. The method and apparatus for monitoring leakage hydrogen of a generator stator cooling system according to claim 1, wherein there is a flowmeter for measuring the exhaust flow rate in the exhaust port above the cooling water storage tank. The method and apparatus of claim 1, wherein an alarm is issued when the amount of the hydrogen gas leak exceeds the reference value.
KR1020070083075A 2007-08-18 2007-08-18 A method and apparatus for monitoring hydrogen leakage into the generator stator cooling water system KR20090018741A (en)

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

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KR20090018741A true KR20090018741A (en) 2009-02-23

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Cited By (3)

* Cited by examiner, † Cited by third party
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

Cited By (5)

* Cited by examiner, † Cited by third party
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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