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Vacuumizing technology for vacuum low-temperature thermal insulation pipeline

A vacuum low temperature, vacuuming technology, applied in the direction of thermal insulation protection of pipelines, pipeline protection, heat preservation, etc., can solve the problems of reducing the vacuum degree of the interlayer, grease and other sundries cannot be removed cleanly, and increasing the evaporation loss of vacuum low temperature thermal insulation tubes. , to achieve the effect of reducing the cold loss of low temperature liquid and high vacuum degree

Inactive Publication Date: 2015-03-25
SUZHOU TOWAY ENG & EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the residual moisture, grease and other sundries in the interlayer cannot be removed completely
During use, these substances will gasify or release gas, thereby reducing the vacuum degree of the interlayer and increasing the evaporation loss of the vacuum cryogenic insulation tube

Method used

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Embodiment Construction

[0013] The present invention will be described in more detail below in conjunction with a specific example of the present invention.

[0014] The invention discloses a vacuuming process for a vacuum low-temperature heat-insulated pipeline. Described process comprises the following steps:

[0015] Step 1. Connect the outlet of the vacuum tube to be evacuated to the vacuum pipeline, and conduct a helium leak test on the vacuum pipeline until it is qualified;

[0016] Step 2: Insert a plurality of stainless steel heating rods inside the inner tube of the vacuum tube, seal the two ends of the inner tube with aluminum foil tape, connect the heating rods in parallel, and use a temperature controller to control the heating rods;

[0017] Step 3. Add liquid nitrogen into the cold trap, turn on the heating rod power supply to heat, set the heating temperature to the preset temperature, start the vacuum unit to continuously evacuate the inner and outer tube interlayers of the vacuum tu...

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Abstract

The invention provides vacuumizing technology for a vacuum low-temperature thermal insulation pipeline, which is as follows: when the low-temperature thermal insulation pipeline is vacuumized, nitrogen gas is used for replacing the air in the pipeline so as to reduce moisture and other foreign substances in the vacuum interlayer to the greatest extent, achieve a higher vacuum degree and reduce the cold loss of the low-temperature liquid. The vacuumizing technology for a vacuum low-temperature thermal insulation pipeline satisfies the large-scale production of vacuum low-temperature thermal insulation pipes and the requirements of simultaneously vacuumizing a plurality of vacuum pipes.

Description

technical field [0001] The invention designs a vacuum-pumping process for a vacuum low-temperature heat-insulating pipeline, and in particular relates to a process for realizing vacuum-pumping of a vacuum low-temperature heat-insulating pipeline by using a hot nitrogen replacement process. Background technique [0002] Low-temperature liquefied gases such as liquid oxygen, liquid nitrogen and liquefied natural gas are mainly transported through vacuum low-temperature insulation tubes. The vacuum low-temperature insulation tubes are composed of inner tubes, outer tubes and multi-layer insulation materials. Reduce radiation heat transfer, and evacuate the interlayer into a high vacuum state to reduce convective heat transfer. The inner and outer tubes are separated by materials with low thermal conductivity to reduce solid heat transfer, thereby controlling the cooling loss of the inner tube to a minimum, fully Meet the long-distance transportation of cryogenic liquids. The v...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16L59/065
Inventor 张亚斐孙飞
Owner SUZHOU TOWAY ENG & EQUIP
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