Use of a mixture of carbon dioxide and nitrogen as an...

Details Use of a mixture of carbon dioxide and nitrogen as an... Use of a mixture of carbon dioxide and nitrogen as an...

C - Chemistry, Metallurgy

10

J

C10J 3/50 (2006.01)

Patent

CA 2685511

The invention relates to a powder injection system for use in pulverized coal gasification under pressure, which system comprises a reservoir (BK) for stocking the pulverized coal, a plurality of powder injection tubes (SES) and a metering unit (DG). According to the invention, a mixture of nitrogen N2 / carbon dioxide CO2 is fed to the components that are at operating pressure, namely the powder injection tube and the metering unit, as the inerting and flow medium or fluidizing medium. The nitrogen N2 / carbon dioxide CO2 mixture-carrying components are heated in such a manner that the temperature is above the threshold of the diphase range. The method according to the invention allows reduction of the nitrogen content in the product gas, which nitrogen is caused by the powder injection system, especially when used in pulverized coal gasification under pressure to produce a synthesis gas for the production of different hydrocarbons.

Dans un système d'alimentation en poussière destiné à la gazéification sous pression de poussière de charbon, qui comprend un réservoir (BK) de stockage de poussière de charbon, un certain nombre de sas d'alimentation en poussière (SES) et un mesureur (DG), les composants soumis à une haute pression de service, à savoir le sas d'alimentation en poussière et le mesureur, sont alimentés en un mélange de dioxyde de carbone CO2 et d'azote N2 comme gaz d'inertisation et de transport ou de fluidisation. Les composants d'alimentation en mélange de dioxyde de carbone CO2 et d'azote N2 sont chauffés, jusqu'à ce que la température se situe au-dessus de la limite de la zone diphasique. Pour un meilleur résultat, notamment lors de la gazéification sous pression de poussière de charbon à des fins de production de gaz de synthèse servant à la production de différents hydrocarbures, la fraction d'azote, due au système d'alimentation en poussière, dans le produit gazeux est réduite.

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