Air separation cooling box layering haling method

Abstract

The invention relates to a method for haling medium in pipeline, in particular to an air separation cooling box layering haling method. The method of the invention concretely includes the following steps: A, cooling box prophase treatment before haling is carried out, including cooling box stopping for liquor discharge and warming in the cooling box; B, haling place is selected, and tools for haling including a discharge opening swing head, a feeding pipe, a material collecting frame and an emptying sack are manufacture and mounted; C, step-by-step selective layering haling is carried out from the discharge opening at the uppermost layer of the cooling box; D, step-by-step haling is carried out until brilliant expansion perlite in the cooling box is discharged to the safe material level, the inlet at the bottom of the cooling box is opened, and haling in cooling box is carried out by entering the interior of the cooling box; E, finally quality of brilliant expansion perlite scratched out from the cooling box is checked, and the brilliant expansion perlite is packaged and stored after being checked to be qualified and is waited to be transported. The method of the invention greatly improves the safety of haling construction, thus not only protecting equipment and pipeline in the cooling box but also guaranteeing life safety of operational personnel.

Description

technical field [0001] The invention relates to a method for removing medium in a pipeline, in particular to a layered sand removal method for an air separation cold box. Background technique [0002] The medium in the pipeline of the cold box equipment of the air separation unit is generally liquid oxygen or liquid nitrogen, which are all operated under ultra-low temperature working conditions. Therefore, in order to ensure the normal operation of the equipment and pipelines in the cold box, the cold box must be filled with cold insulation materials. At present, the material used for cold insulation in the cold box is mainly pearlite (expanded perlite), and pearlite is a It is a white, granular loose material with good thermal insulation properties. The density of pearlite is low. Under normal circumstances, the loose density of pearlite is 35-55Kg / m3 and has good fluidity. Once the pipeline or equipment in the cold box fails during use, it is first necessary to discharge ...

AI Technical Summary

Problems solved by technology

This construction method has three main disadvantages in terms of safety. One is that before the pearly sand is unloaded, the internal faults of the cold box are not known. Large pieces of ice, etc., may cause large pieces of ice to damage the internal equipment pipes of the cold box; the second is that when it is directly discharged from the bottom discharge port, the flow speed is too fast, which is easy to produce sand bursts and cause safety accidents; Third, large-scale packaging operations at the unloading yard make it difficult to control the pearlescent sand flying with the wind, polluting the environment

[0005] b. Sand scraping from top to bottom, using steel pipes to lead the pearly sand to the ground, and then packing, this method is relatively safe, but the cost of tooling materials is high, and because the specific gravity of pearly sand is small, the steel pipe body is heavy , The friction coefficient is large, which is not conducive to the installation of steel pipes and the flow of pearlite. It needs to be hoisted by a large crane, which is time-consuming and laborious

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