B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
183/49, 204/91.8
B01D 53/34 (2006.01) B01D 53/00 (2006.01) B01D 53/60 (2006.01) B01J 19/08 (2006.01)
Patent
CA 1325999
ABSTRACT A process of purifying an exhaust gas containing at least one of SOx and Nox ingredients which comprises: admixing such gas with ammonia; irradiating said mixture with ionizing radiation or ultraviolet light, whereby producing a resultant gas containing fine particulate products; passing said resultant gas through an electrostatic precipitator at a gas flow speed of about 1 to 3 m/sec. thereby causing said fine particulate products to form coalesced particles; removing a major part of said coalesced particles from said electrostatic precipitator; passing gas, containing particles, discharged from said electrostatic precipitator into a mechanical filter at a speed of about 0.3 to 2 m/min., whereby reacting residual non-reacted ingredients with residual ammonia to produce additional particles; removing particles from the gas by said filter; and releasing the gas, containing a reduced particle content, from said mechanical filter to the atmosphere. If the solid particles are to be collected solely by a mechanical filter such as a bag filter, however, when the quantity is large, a large filtering area is needed since filtering resistance increases in a short period of time due to the adhesivity of the particles or their tendency to grow while condensing. In the present invention, since a mechanical filter is provided downstream of an electrostatic precipitator, a high gas flow speed of 1 - 3 m/sec can be applied and the filter resistance of the mechanical filter will not increase in a short period of time due to the small quanity of particles supplied therein, thereby avoiding the need for a large filtering area.
567784
Hirano Shinichi
Kawamura Keita
Ebara Corporation
Riches Mckenzie & Herbert Llp
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