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US 4,232,633 AGranted
Process and reactor for conducting exothermal reactions in a circulating fluidized bed
OwnerLars A. A. Chambertinventor
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OwnerLars A. A. Chambertinventor
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This invention relates to a process and a reactor for conducting exothermal reactions, for instance combustion, between relatively heavy and relatively light phases in a circulating fluidized bed having vertical cooling surfaces for absorption of the reaction heat resulting from the reaction. The light phase is divided into a primary flow for maintaining a dense conventional part bed and a secondary flow for maintaining a less dense rapid part bed above the dense bed. Said rapid part bed is recycled outside the part beds to the dense part bed for producing the circulating bed. Solid phase is continuously supplied to and withdrawn from the circulating bed, and the secondary flow is supplied to the circulating bed mainly below the cooling surfaces. The introduction of the secondary flow into the circulating bed is arranged within the circulating bed and the secondary flow prior to the introduction into the circulating bed is divided into a plurality of part flows, at least some of which part flows are introduced into the circulating bed, directed preferably substantially horizontally from the bed to the lateral boundary walls thereof.
A reactor for conducting exothermal reactions such as combustion, said reactor having lower supply means for supplying relatively heavy phase and a further supply means for supplying relatively light fluidization phase, upper separarting means for separating said phases from one another, return passages for separated heavy phase to the bottom section of the reactor or a region immediately above said bottom section, outlets from the reactor for the relatively heavy and relatively light phases, and cooling surfaces in said reactor, wherein the supply means for said relatively light phase include outlet openings located in the reactor spaced from and facing the reactor side walls and said outlet openings are adjustable in the height direction of the reactor.
A process of effecting a circulating fluidized bed in a reactor with exothermal reactions such as combustion conducted therein between relatively heavy and relatively light phases, providing vertical cooling surfaces in said reactor for absorption of the reaction heat, continuously supplying the relatively heavy phase to and withdrawing same from the vicinity of the lower end of said reactor to effect a dense conventional part bed, introducing a portion of the light phase into said reactor in the vicinity of the lower end thereof from beneath said dense bed as a primary flow for maintaining said dense bed and another portion of the light phase at the upper part of said dense bed still in the vicinity of the lower end of said reactor as a secondary flow for maintaining a less dense rapid part bed above the dense bed, recycling said rapid part bed outside said bed parts to the dense bed part to effect circulation of said bed, dividing said secondary flow into a plurality of part flows, introducing at least some of said part flows of said secondary flow into and transversely of said circulating bed in a region mainly below said cooling surfaces and within said circulating bed at selective variable heights and with the said part flow that is introduced into said circulating bed being directed from locations in the circulating bed to lateral boundary walls of the dense bed.
Dependencies are inferred from the claim text.