Composition, production and use of sorbent particles for...

B - Operations – Transporting – 01 – J

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B01J 20/12 (2006.01) B01D 53/06 (2006.01) B01J 20/02 (2006.01) B01J 20/22 (2006.01)

Patent

CA 2695275

The present methods and systems relate to the removal of sulfur oxides and/or mercury from flue gases by use of a sorbent. Sorbent can comprise an alkali or alkaline earth metal oxide, a transition metal oxide catalyst, and a clay. The sorbent can additionally comprise a polyanion for binding mercury oxides and salts. Methods are provided to produce individual sorbent particles of small diameter, resulting in larger numbers of particles. The state of agglomeration of sorbent particles is important, and aspects of the production and composition of the sorbent are specified so as to either prevent agglomeration or to break up such agglomeration if it occurs. Methods of sorbent injection are indicated both to increase effectiveness as well as economic returns.

Les présents procédés et systèmes portent sur l'élimination d'oxydes de soufre et/ou de mercure dans des gaz d'échappement au moyen d'un sorbant. Le sorbant peut renfermer un oxyde de métal alcalin ou alcalino-terreux, un catalyseur d'oxyde de métal de transition et une argile ainsi qu'un polyanion pour la liaison des oxydes et des sels de mercure. L'invention porte sur des procédés de fabrication des particules de sorbant individuelles et de petit diamètre, générant un plus grand nombre de particules. L'état d'agglomération de particules de sorbant est important et des aspects de la production et de la composition du sorbant sont spécifiés soit pour prévenir soit pour rompre l'agglomération si elle se produit. L'invention porte également sur des procédés d'injection de sorbant qui permettent d'augmenter l'efficacité et le coût du procédé décrit ici.

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