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Hydrogen humidity measuring equipment for hydrogen-cooled generator and method thereof

A hydrogen-cooled generator and humidity measurement technology, applied in the field of sensors, can solve the problems of large dimensions, wrong results, poor accuracy, etc., and achieve the effect of easy pressure-resistant sealing

Active Publication Date: 2018-02-16
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1) Known ventilated psychrometers have poor reproducibility of measurement results, poor accuracy, and cannot withstand pressure during measurement.
[0006] 2) Known electrolysis method, its measurement value is unstable under pressure, and it is not suitable for use in low humidity conditions
[0007] 3) The known electrical measurement methods mainly include the capacitance method and the resistance method. The performance of the probe will deteriorate as the use time increases. When measuring under pressure, the deviation is large, and even the result may be wrong.
[0008] 4) The known dew point method, the most commonly used is the mirror-type photoelectric dew point meter, which has large dimensions, complex structure, strict requirements for use and maintenance, and cannot work under pressure. It is inconvenient to carry and can only be used for offline measurement.

Method used

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  • Hydrogen humidity measuring equipment for hydrogen-cooled generator and method thereof
  • Hydrogen humidity measuring equipment for hydrogen-cooled generator and method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1: as figure 1 As shown, the present invention provides a sensing device suitable for hydrogen humidity measurement of hydrogen-cooled generators.

[0027] This sensing device utilizes a diode laser 1 with a central wavelength in the near-infrared or mid-infrared band or one or more specially selected central wavelengths. The beam of the laser is coupled into the optical fiber 2 and connected to the multiplexer 3; the multiplexer 3. The combined laser beams are connected to the forward optical input port of the circulator 5 by the optical fiber 4, and output from the optical fiber 6 of the common port after passing through the circulator 5.

[0028] The optical fiber 6 at the common port of the circulator 5 is connected to the fiber-coupled collimator 7 outside the generator casing 14, and the output light of the laser is collimated and passes through the pressure-resistant optical window 8, which is installed in the generator casing 14, made of fused silica...

Embodiment 2

[0031] Embodiment 2: as figure 1As shown, the collimator 11 and the corner cube prism 12 constitute the hydrogen region to be measured of the water vapor molecular laser absorption spectrum, which is full of hydrogen to be measured, and the distance is the region where the laser interacts with the water molecule. In the present invention, the effective optical path length is the twice the distance. The diode laser 1 with a central wavelength of 1392nm is used to measure the absorption line of water molecules. The distance only needs to be 5cm, and the obtained absorption line signal can obtain good humidity measurement accuracy.

[0032] Compared with the measurement capability of laser absorption spectroscopy of water vapor molecules, the measurement of hydrogen humidity is not a trace molecular measurement, and satisfactory results can be obtained by using the standard direct absorption method.

[0033] After integrating the absorption spectrum, we have

[0034]

[0035...

Embodiment 3

[0039] Embodiment 3: as figure 1 As shown, the apparatus of the present invention includes a data processing system 20, which uses well-known laser molecular spectroscopy techniques to complete the solution of the measured parameters.

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Abstract

The invention provides hydrogen humidity measuring equipment for a hydrogen-cooled generator. The hydrogen humidity measuring equipment comprises a generator internal component and a generator external component. The shell of the generator is provided with a tightly-connected pressure-resistant optical window. The generator internal component and the generator external component are communicated with each other through the pressure-resistant optical window. The generator internal component comprises optical fiber with fiber coupling collimators at both ends and a cube-corner prism. The generator external component comprises a diode laser, a circulator, a detector and optical fiber with a fiber coupling collimator at one end. By a molecular laser spectroscopic technology and through fingerprint spectral measurement of water vapor molecules, precise on-line measurement of hydrogen humidity under hydrogen working condition is realized. The measurement is only related to inherent physicalcharacteristics of water molecules, has high anti-interference property, and can realize concentration measurement from ppm level to 100%.

Description

technical field [0001] The invention relates to the technical field of sensors, in particular to a hydrogen humidity measuring device and method for a hydrogen-cooled generator. Background technique [0002] Hydrogen is a good cooling medium with the advantages of low density, high specific heat, and high thermal conductivity. It is widely used in the stator and rotor winding cooling systems of thermal and nuclear power plant generator sets. [0003] As hydrogen is recycled inside the generator, its humidity needs to be accurately measured for effective control. The most sensitive part of the generator to hydrogen humidity is firstly the rotor guard ring, which will corrode the generator guard ring if the humidity is too high; the second is the stator end insulation. Excessive humidity will damage the stator end insulation of the generator and cause phase-to-phase short circuit accidents. The low humidity of hydrogen will cause shrinkage and cracks in certain insulating par...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/3504G01N21/359
CPCG01N21/3504G01N21/359G01N2021/354G01N2201/0612
Inventor 卢荣军
Owner SOUTHEAST UNIV