Assembly type blowing system special for online repair of cold insulation structure and suitable for various pipe diameters

Abstract

The invention discloses an assembly type blowing system special for online repair of a cold insulation structure and suitable for various pipe diameters. The blowing system comprises a blowing tool. The blowing tool comprises a plurality of sets of blowing assemblies. Each set of blowing assembly comprises a circular-arc-shaped pipe fitting formed by a metal hose, wherein the circular-arc-shaped pipe fitting is provided with a plurality of diverters, braches of the diverters are connected with metal connection hoses correspondingly, and the other ends of the metal connection hoses are connected with blowing nozzles. After communicating, the multiple circular-arc-shaped pipe fittings communicate with a pipeline through a handle, and the pipeline communicates with an air source. The blowingsystem is easy and convenient to assemble, flexible in adjustment, convenient to control and suitable for to-be-repaired pipelines of various pipe diameters, operation convenience of the tool is improved, meanwhile, an integrated atomization device is arranged, an organic solvent is introduced, and thorough and fast defrosting and deicing are achieved in the blowing process. The blowing system isnot only suitable for LNG pipelines but also suitable for other low-temperature pipelines and devices and can be used and popularized in other low-temperature cryogenic fields.

Description

technical field [0001] The invention relates to a special purging system suitable for on-line repair of a multi-diameter assembled cold-preservation structure, which belongs to the field of low-temperature cryogenic technology. Background technique [0002] my country's LNG industry is developing rapidly. Many domestic LNG receiving stations that have been put into operation have damaged the cold insulation layers of LNG pipelines to varying degrees. Some equipment and pipelines have frost, icing, deformation, and cracking, which not only increases energy consumption, In addition, the corrosion of equipment and pipelines has increased, and it is urgent to repair and replace them. Scientific diagnosis and evaluation of the cold insulation performance of the LNG pipeline cold insulation layer, repair of the cold insulation structure on the existing basis, especially the online repair technology in the case of non-stop production is particularly critical. [0003] During the on...

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Problems solved by technology

[0004] At present, the commonly used methods in the receiving station mainly use simple rags to wipe or use organic solvents such as absolute ethanol to pour or wipe on the surface of the pipeline, but there are many shortcomings, such as poor wiping effect with rags, and ice particles solidified on the surface of the pipeline cannot be wiped off. The effect of defrosting cannot be achieved; organic solvents are volatile, harmful to the human body, flammable, have potential safety hazards, and are expensive, so they are not suitable for repairing and replacing large sections of pipeline cold insulation structures

These methods can barely be used for partial repair of pipelines, but in terms of safety, reliability and economy, they cannot realize large-scale engineering applications at the receiving station site

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