Back to results
US 4,355,601 AGranted
Recirculating flue gas fluidized bed heater
AssigneeConoco Inc.
InventorUday S. Hattiangadi
Life of this patent
Estimating the term…
Abstract
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.
Claims20
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.
8 more elements
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.
9 more elements
Dependencies are inferred from the claim text.