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Low-temperature storage tank interlayer vacuum degree detection method

A low-temperature storage tank and detection method technology, which is applied in the direction of liquid-tightness measurement using liquid/vacuum degree, and by measuring the increase and deceleration rate of the fluid, can solve the problem of inability to judge the vacuum of the low-temperature storage tank and the inconvenience of maintenance of the low-temperature storage tank and other problems, to achieve the effect of easy operation of the detection method, low implementation cost and easy maintenance

Active Publication Date: 2021-01-29
ZHANGJIAGANG HANJUNG CIT CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing conventional detection methods for testing whether the interlayer of cryogenic storage tanks have vacuum failure are vacuum degree measurement, cold test, helium leak detection or pressure testing. The above methods can only confirm whether the cryogenic storage tanks are really out of vacuum, but cannot judge the cryogenic storage tanks The cause of the loss of vacuum is very inconvenient for the maintenance of cryogenic storage tanks

Method used

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  • Low-temperature storage tank interlayer vacuum degree detection method

Examples

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Comparison scheme
Effect test

Embodiment 1

[0023] Such as figure 1 As shown, the medium in the inspected piece 1 is liquefied natural gas, and the main component of the liquefied natural gas is methane. The detection method for the vacuum degree of the interlayer of the inspected piece 1 is as follows:

[0024] The detection device is adopted, and the detection device includes: a vacuum detection tube 2, one end of the vacuum detection tube 2 is an installation end, and the other end is a negative pressure end, the negative pressure end is connected with a vacuum pump 9, and the vacuum detection tube 2 is provided with a negative pressure control valve 8 The vacuum detection pipe 2 between the installation end and the negative pressure control valve 8 is connected with the water detection pipe 411 with the first control valve 41, the hydrogen detection pipe 421 with the second control valve 42, the water detection pipe 421 with the third control valve 71 Medium detection pipe 711, oxygen detection pipe 721 with fourth ...

Embodiment 2

[0033] Such as figure 1 As shown, the medium in the tested part 1 is liquefied natural gas, and the detection method of the interlayer vacuum degree of the tested part 1 is as follows:

[0034] The detection device used is the same as the detection device in the first embodiment.

[0035] The inspection steps are as follows:

[0036] 1. When the vacuum valve 11 is closed, connect the installation end of the vacuum detection tube 2 to the vacuum tube 12 of the object under test, and open the negative pressure control valve 8, the first control valve 41, the second control valve 42, and the second The third control valve 71 and the fourth control valve 72 . Start the vacuum pump 9 to evacuate the vacuum detection tube 2; when the measured value of the vacuum gauge 5 reaches 1×10 -2 Pa, close the negative pressure control valve 8 and the vacuum pump 9, after the vacuum degree of the vacuum detection tube 2 is stable, record the measured value of the vacuum gauge 5, then close ...

Embodiment 3

[0043] Such as figure 1 As shown, the medium in the tested part 1 is liquefied natural gas, and the detection method of the interlayer vacuum degree of the tested part 1 is as follows:

[0044] The detection device used is the same as the detection device in the first embodiment.

[0045] The inspection steps are as follows:

[0046] 1. When the vacuum valve 11 is closed, connect the installation end of the vacuum detection tube 2 to the vacuum tube 12 of the object under test, and open the negative pressure control valve 8, the first control valve 41, the second control valve 42, and the second The third control valve 71 and the fourth control valve 72 . Start the vacuum pump 9 to evacuate the vacuum detection tube 2; when the measured value of the vacuum gauge 5 reaches 1×10 -2 Pa, close the negative pressure control valve 8 and the vacuum pump 9, after the vacuum degree of the vacuum detection tube 2 is stable, record the measured value of the vacuum gauge 5, then close ...

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Abstract

The invention discloses a low-temperature storage tank interlayer vacuum degree detection method, and the employed detection device comprises a vacuum detection tube with two ends being a mounting endand a negative pressure end respectively, and the negative pressure end is connected with negative pressure equipment; a negative pressure control valve is arranged on the vacuum detection tube; thevacuum detection tube is connected with a water detection pipe with a first control valve, a hydrogen detection pipe with a second control valve, a medium detection pipe with a third control valve, anoxygen detection pipe with a fourth control valve and a vacuum degree detection pipe; the water detection pipe is connected with a water adsorbent bin filled with a water adsorbent, the hydrogen detection pipe is connected with a hydrogen adsorbent bin filled with a hydrogen adsorbent, a medium gas detector is arranged on the medium detection pipe, an oxygen detector capable of detecting oxygen and oxygen concentration is arranged on the oxygen detection pipe, and a vacuum gauge is arranged on the vacuum degree detection pipe; and the interlayer vacuum degree of the low-temperature storage tank is detected by using the detection device. The detection method can be used for detecting whether the interlayer is in vacuum failure or not and further judging the vacuum failure reason under thecondition that the interlayer is in vacuum failure.

Description

technical field [0001] The invention relates to the field of vacuum adiabatic cryogenic equipment for storing cryogenic liquids, in particular to a method for detecting the vacuum degree of interlayers of cryogenic storage tanks. Background technique [0002] Cryogenic storage tanks are used to store and transport cryogenic liquids such as liquid nitrogen, liquid oxygen, liquid argon and liquefied natural gas. The structure of the cryogenic storage tank mainly includes: an inner cylinder and an outer cylinder arranged inside and outside, an interlayer is formed between the inner and outer cylinders, a vacuum tube connected to the interlayer is arranged on the outer cylinder, and a vacuum tube is provided on the vacuum tube. Valve, the interlayer is also provided with a vacuum adsorbent for adsorbing gas in order to maintain the vacuum; the vacuum adsorbent includes: normal temperature adsorbent and low temperature adsorbent, and the normal temperature adsorbent is arranged o...

Claims

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Application Information

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IPC IPC(8): G01M3/34
CPCG01M3/34
Inventor 何晓冬朱鸣李晓峰黄晓丰朱关标郁英
Owner ZHANGJIAGANG HANJUNG CIT CO LTD