Fluidized bed reactor

Claim 1

A fluidized bed reactor comprising a housing forming a combustion chamber and containing therein a first distributor plate provided with a plurality of orifices and comprising a first outlet opening, a downwardly extending discharge compartment connected at its upper end to said first outlet opening and provided with a second distributor plate disposed therein at its lower end, said second distributor plate having a plurality of orifices therein and comprising a second outlet opening, an upward flow pipe disposed centrally in the discharge compartment a distance apart from the upper surface of said second distributor plate and from the wall of said discharge compartment and extending upwardly into said combustion chamber through said first outlet opening, means for supplying gas to a first wind box under said first distributor plate, and means for supplying gas to a second wind box located under said second distributor plate, wherein said upward flow pipe is a double-walled pipe, the inner wall of which is provided with openings, means for supplying gas to the space between the walls, a discharge pipe is connected to said second outlet opening, said discharge pipe is provided with openings in its wall and is surrounded by a casing forming a gas space which is connected to a supply source of gas.