Multiple stage method of reforming a gas containing tarry...

C - Chemistry – Metallurgy – 10 – K

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C10K 1/34 (2006.01) C10K 3/02 (2006.01)

Patent

CA 2648969

The invention relates to a method of reforming a gas containing tarry impurities, such as the gasification gas obtained by gasifying a fuel. In the method, oxygen or an oxygenous gas (10) is added to a gas flow (8), after which the gas is brought into contact with a solid catalyst (11, 12) at a high temperature. According to the invention, the reformation takes place in stages so that, in the first pre-reforming stage, the gas is brought into contact with a zirconium-based catalyst (11 ), such as zirconium oxide, for example, and, in the next stage, with a metal catalyst (12), such as metallic nickel. The two-stage reformation is used for preventing the deactivation of the metal catalyst and the formation of carbon deposits in the reforming reactor. The invention also comprises the use of the zirconium compound in pre-reforming the tar-bearing gas to achieve the said goals.

La présente invention concerne un procédé de reformage d'un gaz contenant des impuretés goudronneuses, tel que le gaz de gazéification obtenu en gazéifiant un carburant. Dans le procédé, l'oxygène ou un gaz oxygéné (10) est ajouté au flux de gaz (8), après quoi le gaz est mis en contact avec un catalyseur solide (11, 12) à une température élevée. Selon l'invention, le reformage a lieu par étapes de sorte que, lors de la première étape de reformage, le gaz soit mis en contact avec un catalyseur à base de zirconium (11), tel que l'oxyde de zirconium, par exemple, et, lors de l'étape suivante, avec un catalyseur métallique (12), tel que le nickel métallique. Le reformage en deux étages est utilisé pour empêcher la désactivation du catalyseur métallique et la formation de dépôts de carbone dans le réacteur de reformage. L'invention comprend également l'utilisation du composé à base de zirconium pour pré-reformer le gaz contenant du goudron afin d'atteindre les objectifs.

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