Title:
AIR SEPARATION DEVICE AND AIR SEPARATION METHOD
Document Type and Number:
WIPO Patent Application WO/2021/005744
Kind Code:
A1
Abstract:
An air separation device according to the present invention, which distills the air at a low temperature, is provided with: a high pressure tower that separates high-pressure raw material air into a high-pressure nitrogen gas and high-pressure oxygen-enriched liquid air; a low-pressure tower that separates the high-pressure oxygen-enriched liquid air into a low-pressure nitrogen gas, low-pressure liquid oxygen and argon-enriched liquid oxygen; an argon tower that separates the argon-enriched liquid oxygen at a pressure higher than the pressure of the low-pressure tower into an argon gas and medium-pressure liquid oxygen; a first indirect heat exchanger that performs a heat exchange between the argon gas and the low-pressure liquid oxygen; a second indirect heat exchanger that performs a heat exchange between the high-pressure nitrogen gas and the medium-pressure liquid oxygen; a first gas-liquid separation chamber that separates a low-pressure oxygen gas vaporized by the first indirect heat exchanger from unvaporized low-pressure liquid oxygen; a second gas-liquid separation chamber that separates a medium-pressure oxygen gas vaporized by the second indirect heat exchanger from unvaporized medium-pressure liquid oxygen; a first passage that brings a vapor-phase part of the low-pressure tower and a vapor-phase part of the second gas-liquid separation chamber into communication with each other; a second passage that brings a liquid-phase part of the low-pressure tower and the second gas-liquid separation chamber into communication with each other; a first opening and closing mechanism that is positioned in the first passage; and a second opening and closing mechanism that is positioned in the second passage.
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Inventors:
TACHIBANA HIROSHI (JP)
Application Number:
PCT/JP2019/027313
Publication Date:
January 14, 2021
Filing Date:
July 10, 2019
Export Citation:
Assignee:
TAIYO NIPPON SANSO CORP (JP)
International Classes:
F25J3/04
Foreign References:
| JP2018169051A | 2018-11-01 | |||
| JP2016008778A | 2016-01-18 | |||
| JP2000356465A | 2000-12-26 | |||
| JPH06159929A | 1994-06-07 | |||
| JP2000039257A | 2000-02-08 | |||
| JPS6155515B2 | 1986-11-28 |
Other References:
See also references of EP 3998447A4
Attorney, Agent or Firm:
SHIGA INTERNATIONAL PATENT OFFICE (JP)
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