Method and apparatus for desulfurizing fuel gas

H - Electricity – 01 – M

Patent

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Details

H01M 8/06 (2006.01) B01D 53/86 (2006.01) B01J 8/04 (2006.01) C01B 3/48 (2006.01) C01B 3/58 (2006.01) C01B 17/04 (2006.01)

Patent

CA 2256731

Sulfur and sulfur compounds are removed from a gas stream, such as a hydrocarbon fuel gas stream so as to render the gas stream suitable for use in a fuel cell power plant. Natural gas and recycled hydrogen enters the hydrodesulfurizer assembly at a temperature of about 120 ~F. The gas stream is heated to a temperature of about 625 ~F whereupon it enters a desulfurizing bed (44) formed from a mixture of platinum catalyst deposited on alumina pellets (46) and a pelletized zinc oxide hydrogen sulfide absorbent (48). The gas is cooled to an exit temperature of about 525 ~F as it passes through the desulfurizer bed. The desulfurizer bed is combined with a shift converter (6) which reduces carbon monoxide in the desulfurized gas stream after the latter has passed through a steam reformer bed.

L'invention porte sur un système permettant d'éliminer le soufre et les composés soufrés d'un courant de gaz combustible tel que du gaz d'hydrocarbures pour en permettre son utilisation dans des générateurs à piles à combustible. Le gaz naturel ou l'hydrogène recyclé pénètre dans l'ensemble de désulfuration à une température d'environ 120 ·F, puis il est chauffé jusqu'à 625 ·F et il passe alors sur un lit de désulfuration (44) fait d'un mélange de pastilles d'alumine (46) et de pastilles revêtues d'un catalyseur de platine et de pastilles d'oxyde de zinc (48) absorbant le sulfure d'hydrogène. Le gaz est ramené à sa température de sortie de 525 ·F pendant qu'il traverse le lit désulfurant. Ce dernier est associé à un convertisseur catalytique (6) qui réduit le CO du gaz désulfuré après son passage par un lit de reformage à la vapeur.

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