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A fluidized bed boiler system and a manner of operating the same is provided wherein a fluidized particulate bed in which solids are not recycled is utilized. High temperature flue gas is directed to a boiler means. A portion of both the high temperature and a low temperature gas stream are recycled

A fluidized bed boiler system and a manner of operating the same is provided wherein a fluidized particulate bed in which solids are not recycled is utilized. High temperature flue gas is directed to a boiler means. A portion of both the high temperature and a low temperature gas stream are recycled to a fluidizing gas stream for fluidizing the particulate bed.

대표청구항 ▼

A method of operating a fluidized bed heater, said method comprising the steps of: (a) fluidizing a particulate bed by injecting a stream of fluidizing gas into said bed; (b) charging fuel into said fluidized particulate bed; (c) burning said fuel in said fluidized particulate bed; (d) extracting a

A method of operating a fluidized bed heater, said method comprising the steps of: (a) fluidizing a particulate bed by injecting a stream of fluidizing gas into said bed; (b) charging fuel into said fluidized particulate bed; (c) burning said fuel in said fluidized particulate bed; (d) extracting a high temperature flue gas stream from said fluidized particulate bed; (e) directing to a heat exchanger means a first portion of said high temperature flue gas stream; (f) transferring heat energy from said first portion of said high temperature flue gas stream in said heat exchanger means; (g) recycling a second portion of said high temperature flue gas stream to said fluidizing gas stream and thus to said fluidized particulate bed; (h) adding a stream of combustion gas to said fluidizing gas stream and thus to said fluidized particulate bed; (i) directing a first portion of a low temperature flue gas stream exiting said heat exchanger means to an exhaust stack; and (j) recycling a second portion of said low temperature flue gas stream to said fluidizing gas stream and thus to said fluidized particulate bed. A fluidized bed heater system comprising: a fluidized particulate bed; first conduit means for injecting a stream of fluidizing gas into said fluidized particulate bed; charge means for charging fuel into said fluidized particulate bed; second conduit means for extracting a high temperature flue gas stream from said fluidized particulate bed; heat transfer means for transferring heat energy from said high temperature flue gas stream; third conduit means for directing a first portion of said high temperature flue gas stream from said second conduit means to said heat transfer means; fourth conduit means for recycling a second portion of said high temperature flue gas stream from said second conduit means to said first conduit means; fifth conduit means for directing a stream of combustion gas to said first conduit means; sixth conduit means for extracting a low temperature flue gas steam from said heat transfer means; seventh conduit means for directing a first portion of said low temperature flue gas stream from said sixth conduit means to an exhaust stack; and eighth conduit means for recycling a secong portion of said low temperature flue gas stream from said sixth conduit means to said first conduit means.