Method and plant for the conveyance of fine-grained solids

Details Method and plant for the conveyance of fine-grained solids Method and plant for the conveyance of fine-grained solids

B - Operations, Transporting

01

J

B01J 8/00 (2006.01) B01J 8/18 (2006.01) B01J 8/24 (2006.01) C04B 7/47 (2006.01) F28C 3/16 (2006.01)

Patent

CA 2510791

The present invention relates to a method for the conveyance of fine-grained solids in a fluidized bed reactor and also to a corresponding plant. It is proposed to introduce a first gas or gas mixture from below through a central tube (3) into a mixing chamber (7) of the reactor (1), the central tube (3) being at least partly surrounded by a stationary annular fluidized bed (10) which is fluidized by supplying fluidizing gas. The gas velocities of the first gas or gas mixture as well as of the fluidizing gas for the annular fluidized bed (10) are adjusted such that the particle Froude numbers in the central tube (3) are between 1 and 100, in the annular fluidizied bed (10) between 0.02 and 2 in the mixing chamber (7) between 0.3 and 30.

L'invention concerne un procédé de transport de solides à grains fins dans un réacteur à lit fluidisé, ainsi que des installations correspondantes. Le procédé consiste à introduire un premier gaz ou un mélange de gaz à partir du fond, par l'intermédiaire d'un tube central (3), dans une chambre de mélange (7) du réacteur (1), le tube central (3) étant au moins partiellement entouré d'un lit fluidisé annulaire fixe (10), fluidisé par alimentation d'un gaz de fluidisation. Les vitesses du premier gaz ou du mélange de gaz, ainsi que celles du gaz de fluidisation destiné au lit fluidisé annulaire (10) sont réglées de manière que les nombres de Froude des particules soient compris dans le tube central (3) entre 1 et 100, dans le lit fluidisé annulaire (10) entre 0,02 et 2 et dans la chambre de mélange (7) entre 0,3 et 30.

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