Combined fluidized bed and pulverized coal combustion method

Details Combined fluidized bed and pulverized coal combustion method Combined fluidized bed and pulverized coal combustion method

F - Mech Eng,Light,Heat,Weapons

23

C

F23C 1/00 (2006.01) F23C 6/04 (2006.01) F23C 10/00 (2006.01)

Patent

CA 2446950

The invention relates to a combined fluidized bed and pulverized coal combustion method and system. In the method, fluidizing air (4) is injected into a fluidized bed (2) situated in the bottom portio of the combustion chamber (3). Into the combustion chamber, to above the fluidized bed (2), is fed a mixture of pulverized coal and a carrier gas from a second set of fuel feed means (6) at a mass flow rate which is higher or at least substantially equal to the upper ignition limit of the mixture, and the mixture of the pulverized coals and the carrier gas at least by the fluidizing air (4), and at least a fraction of the fuel fed via the second set of fuel feed means (6) is combusted above the fluidized bed.

L'invention concerne un procédé et un système de combustion de charbon pulvérisé combiné à un lit fluidisé. Le procédé consiste à injecter de l'air de fluidisation (4) dans un lit fluidisé (2) disposé dans la partie inférieure de la chambre de combustion (3), à alimenter en combustible, provenant d'un premier ensemble de moyens d'alimentation en combustible (5), le lit fluidisé (2) et à brûler le combustible dans le lit fluidisé, et à introduire, au dessus du lit fluidisé (2), un mélange de charbon pulvérisé et d'un gaz support, à partir d'un second ensemble de moyens d'alimentation en combustible (6), à un débit massique supérieur ou au moins sensiblement égal à la limite supérieure d'inflammation du mélange, le mélange de charbon pulvérisé et du gaz porteur étant dilué au moins par l'air de fluidisation (4), et une fraction, au moins, du combustible provenant du second ensemble de moyens d'alimentation (6) étant brûlé au dessus du lit fluidisé (2).

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