Thermal conductivity detector and gas chromatograph dedicated for analysis of gas dissolved in insulating oil

A technology of dissolved gas analysis and thermal conductivity detector, applied in the field of gas chromatography, to achieve the effect of simplifying the gas path

Active Publication Date: 2012-06-20
HENAN ZHONGFEN INSTR
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the prior art, the gas chromatograph using this method must be equipped with independent nickel catalytic converter components and flame ionization detectors to achieve the determination of carbon monoxide and carbon dioxide

Method used

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  • Thermal conductivity detector and gas chromatograph dedicated for analysis of gas dissolved in insulating oil
  • Thermal conductivity detector and gas chromatograph dedicated for analysis of gas dissolved in insulating oil
  • Thermal conductivity detector and gas chromatograph dedicated for analysis of gas dissolved in insulating oil

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Embodiment 1

[0017] Example 1 A thermal conductivity detector dedicated to the analysis of dissolved gases in insulating oil, see figure 1 , figure 2 , including a thermal conduction cell, a thermal conduction wire and a lead frame 3 for fixedly installing the thermal conduction wire, a work frame 2 and an insulating seat 1 made of glass sintered, the thermal conduction wires are connected in series and respectively arranged in two detection The rhenium-tungsten wire 4 in the arm is composed of a nickel-plated rhenium-tungsten wire 5, and the thickness of the nickel-plated layer of the nickel-plated rhenium-tungsten wire is 4.5 μm, and the thickness of the coating layer can be controlled by the length of the electroplating time. A heating component is also arranged in the thermal conductivity detector, so that the temperature of the gas path is greater than 100° C. to prevent condensation of water vapor.

[0018] The nickel-plated rhenium-tungsten wire uses the rhenium-tungsten wire to b...

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Abstract

The invention relates to a thermal conductivity detector and a gas chromatograph dedicated for analysis of gas dissolved in insulating oil, wherein the thermal conductivity detector comprises a thermal conductivity cell, a thermal conductivity wire, as well as a lead frame, a work frame and an insulating base that are used for fixing and mounting the thermal conductivity wire; the thermal conductivity wire is composed by a rhenium tungsten filament and a nickel-plated rhenium tungsten filament that are connected in series and arranged in two testing arms respectively; and the thickness of the nickel plate of the nickel-plated rhenium tungsten filament is 4.2 micrometers to 4.6 micrometers. The thermal conductivity detector disclosed by the invention can realize the low efficient nickel catalyst conversion effect, converts portions of carbon monoxide and carbon dioxide into methane, and is normally used for determination of dissolved gas components (carbon monoxide and carbon dioxide) in the insulating oil in an oil-immersed electrical apparatus. The invention can significantly simplify air paths of the gas chromatograph, and requires no longer the configuration of a nickel catalyst converter.

Description

technical field [0001] The invention relates to the field of gas chromatography, in particular to a thermal conductivity detector specially used for the analysis of dissolved gases in insulating oil, which is installed on a gas chromatograph, and can not only test dissolved gases (hydrogen, oxygen, nitrogen) in insulating oil , and can convert dissolved gases (carbon monoxide, carbon dioxide) in insulating oil into methane. Background technique [0002] A thermal conductivity detector (TCD) is a thermal conductivity detector that works on the principle that different components have different thermal conductivities to the carrier gas. After passing a constant current, the temperature of the tungsten wire rises, and its heat is transferred to the cell wall through the surrounding carrier gas molecules. When the component to be measured enters the thermal conductivity cell together with the carrier gas, because the thermal conductivity of the mixed gas is different from that ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/66G01N30/02
Inventor 张洪波王允志杨依军冷永生
Owner HENAN ZHONGFEN INSTR
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