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