Method and plant for removing gaseous pollutants from...

B - Operations – Transporting – 01 – D

Patent

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Details

B01D 53/12 (2006.01) B01D 53/50 (2006.01) B01D 53/68 (2006.01) B01J 8/18 (2006.01) B01J 8/24 (2006.01)

Patent

CA 2509985

The present invention relates to a method for removing gaseous pollutants from exhaust gases, in which the gaseous pollutants react with a fine-grained reactant by forming solids in a fluidized-bed reactor (2), and to a corresponding plant. To achieve low pollutant concentrations in the clean gas with an almost stoichiometric consumption of reactant, it is proposed to introduce the exhaust gas from below through a preferably central gas supply tube (20) into a mixing chamber (21) of the reactor (2), the gas supply tube (20) being at least partly surrounded by a stationary annular fluidized bed (22) of reactant, which bed is fluidized by supplying fluidizing gas, and to adjust the the gas velocities of the exhaust gas and of the fluidizing gas for the annular fluidized bed (22) such that the Particle-Froude-Numbers in the gas supply tube (20) are between 1 and 100, in the annular fluidized bed (22) between 0.02 and 2, and in the mixing chamber (21) between 0.3 and 30.

L'invention porte sur un procédé de suppression de polluants gazeux de gaz d'échappement, dans lequel les polluants gazeux réagissent avec un réactif à grains fins par la formation de solides dans un réacteur à lit fluidisé (2), et sur une plante correspondante. Afin d'obtenir des concentrations de polluants faibles dans le gaz propre avec une consommation sensiblement stoechiométrique de réactif, il est proposé d'introduire le gaz d'échappement de dessous, dans un tube d'amenée de gaz central (20), et de l'envoyer dans une chambre de mélangeage (21) du réacteur (2), le tube d'amenée de gaz (20) étant au moins partiellement entouré d'un lit fluidisé annulaire stationnaire (22) de réactif, ledit lit étant fluidisé par l'amenée de gaz de fluidisation, et de régler la vitesse du gaz d'échappement et du gaz fluidisant pour le lit fluidisé annulaire (22), de sorte que le nombre de Froude de particules dans le tube d'amenée de gaz (20) soit compris (20) entre 1 et 100, dans le lit fluidisé annulaire (22) entre 0,02 et 2, et dans la chambre de mélangeage (21) entre 0,3 et 30.

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