Process for removing a gaseous contaminant from a...

C - Chemistry – Metallurgy – 10 – L

Patent

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C10L 3/10 (2006.01) B01D 45/16 (2006.01) F25J 3/06 (2006.01)

Patent

CA 2730637

The invention provides a process for removing one or more gaseous contaminants from a contaminated feed gas stream, the process compris-ing 1) providing the contaminated feed gas stream, 2) cooling the contaminated feed gas stream to a temperature at which liquid contaminant is formed as well as a contaminant depleted gaseous phase, and 3) separating the two phases by intro-ducing them into a gas/liquid separator vessel, comprising a gas/liquid inlet at an intermediate level, a liquid outlet arranged below the gas/liquid inlet and a gas outlet arranged above the gas/liquid inlet, in which vessel a normally horizontal coalescer is present above the gas/liquid inlet and over the whole cross- section of the vessel and in which vessel a centrifugal liquid separator is arranged above the coalescer and over the whole cross-section of the vessel, the liquid separator com-prising one or more swirl tubes The contaminated gas stream can be a methane--containing gas stream, especially a natural gas stream, or a gas stream from a gasi-fication or combustion process The invention further provides a device for carry-ing out the process as well as the purified gas stream

La présente invention concerne un procédé destiné à éliminer un ou plusieurs contaminants gazeux d'un courant gazeux d'alimentation contaminé, le procédé comprenant les étapes consistant à 1) fournir le courant gazeux d'alimentation contaminé, 2) refroidir le courant gazeux d'alimentation contaminé jusqu'à une température à laquelle le contaminant liquide se forme ainsi qu'une phase gazeuse appauvrie en contaminant, et 3) séparer les deux phases en les introduisant dans une cuve de séparation gaz/liquide, comprenant une entrée de gaz/liquide à un niveau intermédiaire, une sortie de liquide située en dessous de l'entrée de gaz/liquide et une sortie de gaz située au dessus de l'entrée de gaz/liquide. Dans cette cuve, un coalesceur normalement horizontal est présent au-dessus de l'entrée de gaz / liquide et par-dessus l'ensemble de la section transversale de la cuve, et un séparateur de liquides par centrifugation est disposé au-dessus du coalesceur et par-dessus l'ensemble de la section transversale de la cuve, le séparateur de liquides comprenant un ou plusieurs tubes de tourbillonnement. Le courant gazeux contaminé peut être un courant gazeux contenant du méthane, en particulier un courant de gaz naturel, ou un courant gazeux provenant d'un procédé de gazéification ou de combustion. L'invention concerne en outre un dispositif destiné à effectuer le procédé ainsi qu'à obtenir le courant gazeux purifié.

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