Rapid ignition of fluidized bed boiler

Patent · 14 December 1976

OSTI ID:862725

Osborn, Liman D ^[1]

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1. Alexandria, VA

A fluidized bed boiler is started up by directing into the static bed of inert and carbonaceous granules a downwardly angled burner so that the hot gases cause spouting. Air is introduced into the bed at a rate insufficient to fluidize the entire bed. Three regions are now formed in the bed, a region of lowest gas resistance, a fluidized region and a static region with a mobile region at the interface of the fluidized and static regions. Particles are transferred by the spouting action to form a conical heap with the carbonaceous granules concentrated at the top. The hot burner gases ignite the carbonaceous matter on the top of the bed which becomes distributed in the bed by the spouting action and bed movement. Thereafter the rate of air introduction is increased to fluidize the entire bed, the spouter/burner is shut off, and the entire fluidized bed is ignited.

• Assignee: United States of America as represented by United States Energy (Washington, DC)
• Patent Number(s): US 3996863
• Application Number: 05/666,535
• OSTI ID: 862725
• Country of Publication: United States
• Language: English

Related Subjects

/110/122/
action
air
angled
bed
bed boiler
boiler
burner
carbonaceous
carbonaceous matter
concentrated
conical
directing
distributed
downwardly
entire
fluidize
fluidized
fluidized bed
form
formed
gas
gases
granules
heap
hot
hot gas
hot gases
ignite
ignited
ignition
increased
inert
insufficient
interface
introduced
introduction
lowest
matter
mobile
movement
particles
rapid
rate
region
regions
resistance
shut
spouter
spouting
started
static
thereafter
top
transferred