Global to push GA events into
skip to main content

Title: 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.
Inventors:
;
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