Treating exhaust gas from a pressurized fluidized bed reaction s

Details Treating exhaust gas from a pressurized fluidized bed reaction s Treating exhaust gas from a pressurized fluidized bed reaction s

1994-03-22

1995-08-22

Warden, Robert J.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Nitrogen or nitrogenous component

423235, 422172, 422147, 422139, 422171, 110245, 122 4D, 55523, 431 7, 431170, F22B 100

Patent

active

054438063

ABSTRACT:
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).

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