JP2013011374A5

JP2013011374A5 -

Info

Publication number: JP2013011374A5
Application number: JP2011143159A
Authority: JP
Filing date: 2011-06-28
Publication date: 2014-06-19
Anticipated expiration: 2031-06-28

Description

この空気分離装置は、運転条件を適宜設定して以下に示す各工程を実施することにより、製品として、酸素ガス（ＧＯ２），高圧窒素ガス（ＨＰＧＮ２），中圧窒素ガス（ＭＰＧＮ２），低圧窒素ガス（ＬＰＧＮ２），高圧液化窒素（ＨＰＬＮ２），中圧液化窒素（ＭＰＬＮ２），低圧液化酸素（ＬＰＬＯ２）をそれぞれ採取することができる。 In this air separation device, the operating conditions are set as appropriate, and the following steps are carried out. As a product, oxygen gas (GO2), high-pressure nitrogen gas (HPGN2), medium-pressure nitrogen gas (MPGN2), low-pressure nitrogen gas (LPGN2), high-liquefied nitrogen (HPLN2), medium pressure liquid nitric (MPLN2), can be collected respectively a low pressure liquid oxygen (LPLO2).

一方、前記中圧塔１２の底部に分離した前記中圧酸素富化液化空気の残部と、前記高圧塔１１における第１分離工程の中間段階で高圧塔１１の下部から経路Ｌ１７に抜き出した高圧窒素富化空気の一部とは、前記中圧塔蒸化器１６で間接熱交換を行い、前記高圧窒素富化空気を凝縮液化して高圧窒素富化液化空気を得ると同時に前記中圧酸素富化液化空気を蒸発ガス化して中圧酸素富化空気を得る第３間接熱交換工程が行われる。中圧塔蒸化器１６で蒸発ガス化した中圧酸素富化空気は中圧塔１２の上昇ガスとなり、中圧塔蒸化器１６で凝縮液化した高圧窒素富化液化空気は、経路Ｌ１８を通って高圧塔１１に戻され、高圧塔１１の下降液となる。 On the other hand, the remainder of the medium-pressure oxygen-enriched liquefied air separated at the bottom of the medium-pressure column 12 and the high-pressure extracted from the lower part of the high-pressure column 11 to the path L 17 in the intermediate stage of the first separation step in the high-pressure column 11. A part of the nitrogen-enriched air is indirectly heat-exchanged by the intermediate-pressure tower evaporator 16 to condense and liquefy the high-pressure nitrogen-enriched air to obtain high-pressure nitrogen-enriched liquefied air and at the same time the intermediate-pressure oxygen A third indirect heat exchange step is performed in which the enriched liquefied air is vaporized to obtain medium pressure oxygen enriched air. The medium-pressure oxygen-enriched air evaporated and gasified in the medium-pressure tower evaporator 16 becomes the rising gas of the medium-pressure tower 12, and the high-pressure nitrogen-enriched liquefied air condensed and liquefied in the medium-pressure tower evaporator 16 passes through the path L18. It returns to the high pressure column 11 and becomes a descending liquid of the high pressure column 11.

本形態例においても、製品酸素ガス回収経路Ｌ２２から製品酸素ガスが、低圧窒素ガス回収経路Ｌ２３から製品低圧窒素ガスが、高圧窒素ガス回収経路Ｌ２４から製品高圧窒素ガスがそれぞれ採取される。また、図示は省略するが、前記同様に、製品中圧窒素ガス、製品高圧液化窒素、製品中圧液化窒素、製品低圧液化酸素を採取することや廃ガスを抜き出すことも可能である。 Also in this embodiment, the product oxygen gas is collected from the product oxygen gas recovery path L22, the product low pressure nitrogen gas is collected from the low pressure nitrogen gas recovery path L23, and the product high pressure nitrogen gas is collected from the high pressure nitrogen gas recovery path L24. Moreover, although illustration is abbreviate | omitted, it is also possible to extract | collect product intermediate pressure nitrogen gas, product high pressure liquefied nitrogen, product intermediate pressure liquefied nitrogen, product low pressure liquefied oxygen, and to extract waste gas like the above.