Air separation with intermediate pressure vaporization and...

F - Mech Eng,Light,Heat,Weapons – 25 – J

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F25J 3/04 (2006.01)

Patent

CA 2228799

A double column cryogenic air separation system is operated to increase boilup in the lower pressure column by vaporizing at an intermediate pressure a liquid stream containing at least 20 mole% oxygen, word expanding the stream, and introducing the resulting expanded stream into the lower pressure column. Operation in this mode increases oxygen recovery at a given rate of compressed and purified air feed or reduces the amount air feed required to produce a given rate of oxygen product. Argon recovery can be integrated efficiently with intermediate pressure vaporization and word expansion steps.

On utilise un système cryogénique de séparation d'air à double colonne pour augmenter l'ébullition dans la colonne à pression réduite en vaporisant à une pression intermédiaire un écoulement liquide contenant au moins 20 % d'oxygène (rapport molaire), en détendant le gaz et en introduisant ce gaz détendu dans la colonne à pression réduite. Cette opération augmente le taux de récupération de l'oxygène à un débit donné d'alimentation en air comprimé et purifié ou réduit le volume d'alimentation en air nécessaire pour obtenir un débit donné de produit oxygéné. On peut intégrer de façon efficace la récupération de l'argon avec des étapes intermédiaires de vaporisation sous pression et de détente.

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