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Method and apparatus for separating air by cryogenic distillation

A low-temperature distillation, air technology, used in lighting and heating equipment, cold process separation, refrigeration and liquefaction, etc., can solve problems such as impractical or impossible

Inactive Publication Date: 2015-09-02
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

As equipment sizes become larger, fluid reserve issues become impractical or impossible for equipment outages lasting more than a few hours

Method used

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  • Method and apparatus for separating air by cryogenic distillation
  • Method and apparatus for separating air by cryogenic distillation
  • Method and apparatus for separating air by cryogenic distillation

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Embodiment Construction

[0029] The new method of the present invention for increasing production based on low-cost storage purposes is in figure 1 Shown in. Compared with the traditional method in which a complete backup group is provided to ensure production, a simpler and lower cost nitrogen generator is proposed to replace the backup cold box. The nitrogen generator is designed to operate at a pressure similar to that of the oxygen generator (about 11 bar in the present invention) to ensure a simple compressor equipment reserve. However, other pressures can be used.

[0030] This storage concept using nitrogen generators can generally be applied to multi-group devices of low-temperature oxygen production equipment. In the following detailed description, the nitrogen generator synergy is similar to that of the present invention Figure 4 The process described in the cold box process layout. in figure 1 , The nitrogen generator separates the air into a nitrogen-rich stream 205 and a very rich / very c...

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Abstract

In a process for the production of nitrogen and of oxygen enriched liquid by separation of air by cryogenic distillation, a first stream of air is sent to an exchanger to form a first cooled air stream, the first cooled air stream is sent to a bottom reboiler of a column, condensed air is sent from the bottom reboiler to a top condenser of the column, vaporized air is sent from the top condenser to a first compressor, air is sent from the first compressor to the column, air is sent to a second compressor and from the second compressor to the exchanger to produce a cooled second air stream, the cooled second air stream is sent to a first turboexpander and from the turbo expander to the column, bottom liquid is removed from the column and gaseous nitrogen is removed from the top of the column.

Description

Technical field [0001] The present invention relates to a method / process and application for separating air by cryogenic distillation. Background technique [0002] Large-scale gas or coal gasification sites can be built in the near future. All gasification processes require large amounts of high-pressure oxygen. [0003] The size of ASU equipment has steadily increased in the past four decades, and this trend shows no signs of stopping. As equipment sizes become larger and larger, the problem of liquid storage becomes impractical or impossible for equipment interruptions that last more than a few hours. [0004] Current technology will allow equipment sizes up to 7000 metric tons of oxygen per day. Currently, the maximum benchmark equipment size is between 4000 to 5000 metric tons per day. [0005] For example, in the near future, coal gasification may require a very large oxygen consumption of up to 50,000 T / D. Gas-liquid conversion equipment is another example with high oxygen ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25J3/00
CPCF25J3/0409F25J2245/42F25J2200/72F25J3/04296F25J3/04393F25J3/04951F25J2200/10F25J2250/20F25J2245/50F25J3/04303F25J3/0429F25J3/04309F25J2200/50F25J2205/30F25J3/04963F25J3/04454F25J3/04884F25J3/04872F25J3/04054F25J3/044F25J3/04824
Inventor B·哈J-R·布吕热罗勒
Owner LAIR LIQUIDE SA POUR LETUDE & LEXPLOITATION DES PROCEDES GEORGES CLAUDE
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