Title:
METHOD AND DEVICE FOR PRODUCING AIR PRODUCT BASED ON CRYOGENIC RECTIFICATION
Document Type and Number:
WIPO Patent Application WO/2019/127343
Kind Code:
A1
Abstract:
A method and a device for producing an air product based on cryogenic rectification; after being cooled by a main heat exchanger, raw material air (101) and nitrogen compressed by means of a compressor (4) are sent to a rectification system for low temperature separation. In the rectification system, products such as oxygen and nitrogen are obtained by means of low temperature separation, and oxygen-enriched liquid air (1081, 1082) is obtained at or near the bottom of a rectification tower. The oxygen-enriched liquid air (1081, 1082) or liquid-state air in the rectification system is sent out after being raised to a target pressure by means of a low temperature liquid air pump; air products of various pressures can be produced by means of selecting low temperature liquid air pumps with different lifts or by connecting in series different amounts of low temperature liquid air pumps. The present method can avoid the need to arrange additional air compressors, entirely changing the method for producing medium and high pressure air products in a nitrogen circulation process, and importantly can reduce production costs significantly whilst having greater flexibility. In addition, the present method can increase the oxygen extraction rate of an apparatus, thereby improving the energy efficiency level.
Inventors:
ZHAO BOWEI (CN)
BRIGLIA ALAIN (CN)
XUE FENGJIE (CN)
BRIGLIA ALAIN (CN)
XUE FENGJIE (CN)
Application Number:
PCT/CN2017/119773
Publication Date:
July 04, 2019
Filing Date:
December 29, 2017
Export Citation:
Assignee:
AIR LIQUIDE (FR)
ZHAO BOWEI (CN)
BRIGLIA ALAIN (CN)
XUE FENGJIE (CN)
ZHAO BOWEI (CN)
BRIGLIA ALAIN (CN)
XUE FENGJIE (CN)
International Classes:
F25J3/04
Foreign References:
| CN1407303A | 2003-04-02 | |||
| CN102721263A | 2012-10-10 | |||
| CN203928597U | 2014-11-05 | |||
| CN101886870A | 2010-11-17 | |||
| CN106440659A | 2017-02-22 | |||
| EP2447653A1 | 2012-05-02 | |||
| US6082135A | 2000-07-04 |
Attorney, Agent or Firm:
SUNSHINEIP INTELLECTUAL PROPERTY LAW FIRM (CN)
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