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Method for detecting micro-water content in gas under plateau condition based on mirror surface dew point method

A technology for micro water content and gas detection, applied in the direction of material water content, etc., to achieve the effects of accurate test results, easy promotion and use, and simple test process

Active Publication Date: 2018-02-09
EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID
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  • Application Information

AI Technical Summary

Problems solved by technology

The correction calculation method provided by the present invention mainly solves the pressure change brought by the plateau environment and the temperature change brought by the environment, and corrects the test deviation when the mirror surface dew point method is used to test the micro-water content

Method used

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  • Method for detecting micro-water content in gas under plateau condition based on mirror surface dew point method
  • Method for detecting micro-water content in gas under plateau condition based on mirror surface dew point method
  • Method for detecting micro-water content in gas under plateau condition based on mirror surface dew point method

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Embodiment 1

[0031] Step (1) Test the equipment temperature T in the environment of Kunming Plateau 1 (303.15K), atmospheric pressure P at the test site 1 (0.08MPa);

[0032] Step (2) start the dew point meter, and ventilate the nitrogen drying system;

[0033] Step (3) test sulfur hexafluoride (SF6) gas sample, obtain dew point T 2 (-20.2°C), measure at least 3 times until the value is basically stable; check the saturated vapor pressure table of ice to find the dew point T 2 (-20.2℃) corresponding water vapor pressure P 2 (101.296Pa).

[0034] Step (4) Use the correction formula to correct the water vapor pressure and the pressure of sulfur hexafluoride back to 20°C under the condition of 1 atmospheric pressure, and calculate the micro-water content X in SF6 1 ,

[0035] The correction formula is as follows, the calculation result of the correction formula is in ppm:

[0036]

[0037] Bring in P 2 P 1 T 1 T 3 R calculates the result, and the calculated water content should ...

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Abstract

The invention discloses a method for detecting micro-water content in gas under the plateau condition based on a mirror surface dew point method. The method comprises the following steps that 1, device temperature T1 is tested, and atmospheric pressure P1 of a site is tested; 2, a dew-point instrument is started, and nitrogen gas is introduced to a drying system; 3, a gas sample is tested to obtain a dew point T2, at least three times of measurement are performed till values are basically stable; 4, an icy saturated vapor pressure meter is used for checking water vapor pressure P2 corresponding to the T2; 5, a correction formula is used for correcting the water vapor pressure and sulfur hexafluoride pressure back to 20 DEG C, and the micro-water content X1 in corrected standard SF6 is finally obtained under the condition of one atmospheric pressure. The given correction formula is used for correcting a testing result of the dew-point instrument according to the temperature of a testingdevice and the atmospheric pressure of a testing place, so that the testing result is more accurate.

Description

technical field [0001] The invention belongs to the technical field of dew point measurement and correction, and in particular relates to a method for detecting micro-water content in gas by mirror surface dew point method under plateau conditions. Background technique [0002] Dew point meter is an important humidity measurement equipment, widely used in power system SF 6 Dew point detection, air purification and clean room, compressed air drying, steam turbine anti-icing, drying industry, food processing, plastic substrate drying, ammonia production and purity maintenance, etc., are currently widely used in high-altitude areas, but the dew point in high-altitude areas There is a large deviation between the test results of the instrument and the low-altitude areas. The method for testing water content with a dew point meter is to divide the vapor pressure of water corresponding to the dew point value by the corresponding atmospheric pressure at 20°C and 1 atmospheric press...

Claims

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Application Information

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IPC IPC(8): G01N25/66
CPCG01N25/66
Inventor 黄和燕金辉吴浩杨栋龙方宇许毅王鑫吴德贯夏辉李红元潘凯邵成林
Owner EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID
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