Treating exhaust gas from a pressurized fluidized bed reaction system
Hot gases from a pressurized fluidized bed reactor system are purified. Under super atmospheric pressure conditions hot exhaust gases are passed through a particle separator, forming a filtrate 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 super atmospheric 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). 8 figs.
- Issue Date:
- OSTI Identifier:
- 100971
- Assignee:
- A. Ahlstrom Corp., Noormarkku (Finland) PTO; SCA: 010402; 010800; PA: EDB-95:127928; SN: 95001445714
- Patent Number(s):
- US 5,443,806/A/
- Application Number:
- PAN: 8-215,945
- Contract Number:
- FC21-91MC27364
- Resource Relation:
- Other Information: PBD: 22 Aug 1995
- Research Org:
- City of Lakeland
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 01 COAL, LIGNITE, AND PEAT; EXHAUST GASES; HOT GAS CLEANUP; DEASHING; DENITRIFICATION; FILTERS; FLUIDIZED-BED COMBUSTORS; NITROGEN OXIDES; REDUCTION; FLY ASH; REMOVAL; GAS TURBINES