Method and device for distributing liquid fuel to a fluidized bed

Claim 1

In a fluidized bed incinerator comprising a constriction plate supporting a fluidized bed of refractory particles, said constriction plate having a plurality of tuyeres therethrough for supplying fluidizing and primary combustion air to said bed from a windbox provided below the constriction plate; a plurality of substantially vertical risers extending through the constriction plate and feeding liquid fuel to the fluidized bed separate from the combustion air; and means for supplying fuel and gaseous driving agent to the risers below the constriction plate, the improvement wherein said means for supplying said liquid fuel comprises closed pipe loops within which the fuel circulates and a restricted fuel nozzle positioned at the lower end of the risers for atomizing said fuel and for connecting each of said risers to one of said closed loops; and said means for supplying said gaseous driving agent comprises a feed pipe system for supplying small quantities of high pressure gaseous driving agent and one or more restricted driving agent nozzles for connecting each of said risers to said feed pipe system, said driving agent nozzles being positioned in close proximity to said fuel nozzles for intimate admixture of the driving agent and the atomized fuel at the lower end of the riser.