Treating exhaust gas from a pressurized fluidized bed reaction system

Patent · Sun Jan 01 04:00:00 EST 1995

OSTI ID:870038

Isaksson, Juhani ^[1]; Koskinen, Jari ^[1]

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1. Karhula, FI

Hot gases from a pressurized fluidized bed reactor system are purified. Under superatmospheric pressure conditions hot exhaust gases are passed through a particle separator, forming a flitrate cake on the surface of the separator, and a reducing agent--such as an NO.sub.x reducing agent (like ammonia), is introduced into the exhaust gases just prior to or just after particle separation. The retention time of the introduced reducing agent is enhanced by providing a low gas velocity (e.g. about 1-20 cm/s) during passage of the gas through the filtrate cake while at superatmospheric pressure. Separation takes place within a distinct pressure vessel the interior of which is at a pressure of about 2-100 bar, and-introduction of reducing agent can take place at multiple locations (one associated with each filter element in the pressure vessel), or at one or more locations just prior to passage of clean gas out of the pressure vessel (typically passed to a turbine).

• Research Organization: City of Lakeland
• DOE Contract Number: FC21-91MC27364
• Assignee: A. Ahlstrom Corporation (Noormarkku, FI)
• Patent Number(s): US 5443806
• OSTI ID: 870038
• Country of Publication: United States
• Language: English

Related Subjects

/423/55/110/122/422/431/
1-20
2-100
agent
agent--such
ammonia
and-introduction
associated
atmospheric pressure
bar
bed
bed reaction
bed reactor
cake
clean
clean gas
cm
conditions
distinct
element
enhanced
exhaust
exhaust gas
exhaust gases
filter
filter element
filtrate
flitrate
fluidized
fluidized bed
forming
gas
gas velocity
gases
hot
hot exhaust
hot gas
hot gases
interior
introduced
locations
multiple
particle
particle separation
particle separator
passage
passed
pressure
pressure conditions
pressure vessel
pressurized
pressurized fluid
pressurized fluidized
prior
providing
purified
reaction
reactor
reducing
reducing agent
retention
retention time
separation
separator
superatmospheric
superatmospheric pressure
surface
takes
time
treating
turbine
typically
velocity
vessel