Circulating fluidized bed combustion reactor with ash recycle

Patent · Tue Jan 01 04:00:00 EST 1991

OSTI ID:5214548

Bennett, D L; Studer, D W

This patent describes a process for combusting a solid hydrocarbon fuel in a fluidized bed combustion reactor having adjoining cooling tubes which surround a combustion zone; combusting the fuel in the presence of the oxygen-containing gas within a predetermined temperature range thereby forming hot exhaust gases containing solid particles; discharging the hot exhaust gases containing the solid particles from the combustion zone and cooling the exhaust gases by indirect heat exchange against the cooling tubes; separating the resultant cooled solid particles into at least a first portion which is recycled into the combustion zone and a second portion having an average particle size smaller than the first portion containing substantially flyash; separating the second portion into an exhaust gas stream substantially free of flyash and a recycle flyash stream; recycling a portion of the recycle flyash stream into the combustion zone at an effective rate so as to maintain the predetermined temperature range within the combustion zone; and venting the gas stream which is substantially free of solid particles.

• Assignee: Air Products and Chemicals, Inc., Allentown, PA (USA)
• Patent Number(s): US 4981111; A
• Application Number: PPN: US 7-442032
• OSTI ID: 5214548
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
014000* -- Coal
Lignite
& Peat-- Combustion
AEROSOL WASTES
ASHES
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
CIRCULATING SYSTEMS
COAL
COMBUSTION
COMBUSTION PRODUCTS
COMBUSTORS
DESIGN
EMISSION
ENERGY SOURCES
EXHAUST SYSTEMS
FLUE GAS
FLUIDIZED-BED COMBUSTION
FLUIDIZED-BED COMBUSTORS
FLY ASH
FOSSIL FUELS
FUEL FEEDING SYSTEMS
FUEL SYSTEMS
FUELS
GASEOUS WASTES
MATERIALS
OXIDATION
PARTICLE SIZE
PURIFICATION
RECYCLING
REMOVAL
RESIDUES
SEPARATION PROCESSES
SIZE
THERMOCHEMICAL PROCESSES
WASTES