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Cryogenic rectification process-based method for producing air product, and air separation system

a cryogenic rectification and air separation technology, applied in the field of air separation, can solve the problems of compromising the overall energy consumption level of the air separation device, no longer viable to rely solely on this air booster, etc., and achieve the effect of greatly reducing production costs and improving energy efficiency

Pending Publication Date: 2021-05-13
LAIR LIQUIDE SA POUR LETUDE & LEXPLOITATION DES PROCEDES GEORGES CLAUDE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a method for producing high-pressure or ultra-high-pressure air using an existing cryogenic rectification process apparatus. The method involves pressurizing and liquefying feed air and / or oxygen-enriched liquid air, which is then boosted to a required high pressure or ultra-high pressure using a liquid air booster pump, before being discharged as an air product after vaporization through a heat exchange apparatus. This method avoids the need for an additional air compressor or to increase the discharge pressure of the air booster, reducing production costs and improving energy efficiency. The air product can be air, air mixed with oxygen-enriched liquid air, or oxygen-enriched liquid air mixed with the pressurized and liquefied feed air.

Problems solved by technology

However, to produce an air product with a pressure higher than a discharge pressure of the air booster itself, it is no longer viable to rely solely on this air booster, and it is usually necessary to provide an additional high-pressure / ultra-high-pressure compressor or passively increase the discharge pressure of the air booster.
However, all these methods will compromise the overall energy consumption level of the air separation device.

Method used

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  • Cryogenic rectification process-based method for producing air product, and air separation system
  • Cryogenic rectification process-based method for producing air product, and air separation system

Examples

Experimental program
Comparison scheme
Effect test

embodiment 1

[0078]After feed air (1 bara) sequentially passes through the main air compressor 21 for pressurization to 6 bara (the first pressure range), the air pre-cooling apparatus 40 for pre-cooling and the air purification apparatus 50 for purification, one portion thereof is split off as a first air stream guided along the first air inlet line 101, through the heat exchange apparatus (the low-pressure plate heat exchanger 31) for heat exchange with a gas or liquid product produced by rectification (e.g., liquid nitrogen discharged from the top of the first column, and / or liquid nitrogen discharged from the top of the second column, and / or a liquid nitrogen fraction discharged from an upper part of the second column), and after cooling down (6 bara), into the first column 11 for rectification; and the other portion passes through the air booster 22 for pressurization to 50 bara (the third pressure range) before being split into a second air stream and a third air stream: the second air str...

embodiment 2

[0090]The cryogenic rectification process system is used to prepare high-pressure or ultra-high-pressure air: as shown in FIG. 2, the fifth air stream is guided along the fifth air inlet line 105 with its flow velocity and flow rate controlled by the first regulating valve 1051, and in the air product outlet line 113, is pressurized to a high pressure or ultra-high pressure by the liquid air booster pump 1131, and vaporized via heat exchange through the heat exchange apparatus (the high-pressure plate heat exchanger 32) to obtain the required high-pressure or ultra-high-pressure air product, which is pressurized feed air.

[0091]In some embodiments, the flow velocity and flow rate of the third air stream depressurized to the first pressure range are optionally controlled by the first regulating valve 1051, and in the air product outlet line 113, said air stream is pressurized to a high pressure or ultra-high pressure by the liquid air booster pump 1131, and vaporized via heat exchange...

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Abstract

The present invention discloses a cryogenic rectification process-based method for producing an air product, and an air separation system. By adding an air product outlet line and a liquid air booster pump to an existing cryogenic rectification process apparatus, the existing rectification apparatus is used to prepare oxygen-enriched liquid air by pressurizing, cooling and liquefying feed air; and moreover, a high-pressure or ultra-high-pressure air product can be prepared according to customer requirements by adjusting the ratio of the feed air to the oxygen-enriched liquid air, and pressurizing the mixture to a target pressure by the liquid air booster pump before being vaporized via heat exchange with a gas or liquid product produced by rectification through a heat exchange apparatus. According to the present invention, when gas or liquid products of oxygen and nitrogen are produced by means of rectification, a high-pressure or ultra-high-pressure air product can be provided according to customer requirements, and there is no need to provide an additional air compressor or passively increase the discharge pressure of the air booster, so that the production costs are greatly reduced and the energy efficiency level is improved. The method of the present invention can also improve the stability of devices, especially when a small amount of high-pressure / ultra-high-pressure air product needs to be produced.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is a ยง 371 of International PCT Application PCT / CN2017 / 119240, filed Dec. 28, 2017, which is herein incorporated by reference in its entirety.TECHNICAL FIELD OF THE INVENTION[0002]The present invention belongs to the field of air separation and relates to an air separation process, in particular to a cryogenic rectification process-based method for producing an air product, and an air separation system.BACKGROUND OF THE INVENTION[0003]Cryogenic rectification is essentially a technology for gas liquefaction, in which mechanical methods, such as throttling expansion or adiabatic expansion, are usually used to compress and cool gases, and then rectify the gases by taking advantage of the difference in boiling points of different gases to separate the different gases. Specifically, air is taken as a feedstock and liquefied after being subject to compression, purification and heat exchange, and nitrogen and oxygen are obtained...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F25J3/04
CPCF25J3/04412F25J3/0409F25J3/04084F25J2245/40F25J3/04296F25J2215/40F25J2240/10F25J3/04387F25J3/04078F25J3/04218F25J2245/02F25J3/04018F25J3/04024F25J3/04145F25J2215/02
Inventor ZHAO, BOWEIBRIGLIA, ALAINXUE, FENGJIE
Owner LAIR LIQUIDE SA POUR LETUDE & LEXPLOITATION DES PROCEDES GEORGES CLAUDE