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Apparatus for separating air by cryogenic distillation comprising three columns comprising two concentric columns

A technology of air separation and low-temperature distillation, which is applied in the direction of distillation separation, separation method, cold treatment separation, etc., and can solve problems such as increasing the cross-sectional area of ​​the cold box

Pending Publication Date: 2022-03-29
LAIR LIQUIDE SA POUR LETUDE & LEXPLOITATION DES PROCEDES GEORGES CLAUDE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adding additional towers such as the third tower above will further increase the cross-sectional area of ​​the cold box, and in fact even require additional tanks
Other constructions than this are known, such as those described in European patent 1 078 212 B1, but they still require a widening of the cold box or require another cold box

Method used

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  • Apparatus for separating air by cryogenic distillation comprising three columns comprising two concentric columns
  • Apparatus for separating air by cryogenic distillation comprising three columns comprising two concentric columns

Examples

Experimental program
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Embodiment Construction

[0053] figure 1 Shown is a plant for the separation of air by cryogenic distillation comprising a first column K1 with an upper section and a lower section which can be operated at a first pressure and which can be operated at a second pressure lower than the first pressure and A second column K2 with a diameter.

[0054] The second tower K2 is located above the first tower K1 so as to form a single structure.

[0055] The air stream 1 is fed as feed gas into the storage tank of the first column K1, where the air stream is separated by distillation into an oxygen-rich liquid in the storage tank and a nitrogen-rich gas at the top of the column.

[0056] The first column K1 is also supplied with a two-phase air flow 3 which, in the figure, passes through the packing in a duct.

[0057] Channels on the outside of the packing would be preferred.

[0058] A third column K3 in the form of a ring having an inner diameter and an outer diameter is positioned around this first column...

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Abstract

The invention relates to a device for separating air by cryogenic distillation, comprising: three columns (K1, K2, K3), including two concentric columns, the outer diameter of the third column being at most equal to the diameter of the second column; a duct for supplying air (AG1) to the third tower; a return line (13) connected to the middle height of the upper section of the first column in order to extract the nitrogen-rich liquid, the line being connected to the top of the second column and passing through the area of the third column not containing the heat exchange means and the mass exchange means; and an intermediate duct (9) for extracting the liquid at the intermediate height of the first column. The invention also relates to a method for separating air by cryogenic distillation in a column system.

Description

technical field [0001] The invention relates to a plant for the separation of air by cryogenic distillation comprising at least three separation columns, including two concentric columns. Background technique [0002] It is known to separate air in a double distillation column comprising a first column operating at a first pressure and a second column operating at a second pressure lower than the first pressure. Traditionally, the storage tank of the second column is thermally connected to the top of the first column. [0003] The third tower can be connected to the second tower, and optionally to the first tower. [0004] This third column may be of the Etienne column type operating at a pressure between the first pressure and the second pressure and fed by oxygen-enriched liquid from the storage tank of the first column. The oxygen-enriched fluid and nitrogen-enriched fluid produced in the third column may be fed to the second column at different heights / levels. [0005...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25J3/04
CPCF25J3/04448F25J2200/08F25J3/04939F25J3/04466F25J2235/50F25J2200/06B01D3/141B01D3/32F25J3/0443
Inventor P·勒博特
Owner LAIR LIQUIDE SA POUR LETUDE & LEXPLOITATION DES PROCEDES GEORGES CLAUDE