Electro-precipitation

Claim 2

The combination according to claim 1, wherein the manifold provides a leading portion of the aerofoil configuration.

Claim 3

The combination according to claim 1, wherein a baffle is secured to the manifold upstream of the nozzle to provide a leading portion of the aerofoil configuration.

Claim 4

The combination according to claim 1 wherein the duct is horizontal at the injection assembly and the manifold extends forwardly and upwardly in the duct.

Claim 5

The combination according to claim 1, wherein the supply means comprises an evaporator adapted to supply conditioning agent comprising SO3 gas by the evaporation of stabilized liquid SO3.

Claim 6

Electro-precipitation plant comprising an electro-precipitator having an inlet, a duct connected to the inlet of the electro-precipitator and arranged to conduct gas to be cleaned to the electro-precipitator, a plurality of injection assemblies in the duct, an evaporator for the evaporation of stabilized liquid SO3 to supply conditioning agent comprising SO3 gas to the injection assemblies for the injection of the conditioning agent into the gas to be cleaned; each injection assembly comprising a plurality of manifolds extending across the duct and a plurality of manifolds extending across the duct and a plurality of elongated nozzles extending from each manifold generally in the direction of gas flow, each manifold extending upwardly in the duct and the nozzles extending from said manifold being in staggered relationship whereby any solid material collecting around an upper nozzle outlet cannot fall therefrom near to a lower nozzle outlet; and means defining a generally aerofoil configuration for presentation to the gas flowing along the duct past each nozzle; each nozzle having an outlet at a distance not less than about 3 inches from its manifold and being tapered at an angle of not more than about 14* to provide a trailing portion of the aerofoil configuration.

Claim 8

A method according to claim 8 wherein the conditioning agent comprises SO3 obtained by evaporation from stabilized liquid SO3.

Claim 10

In electro-precipitation apparatus, a duct through which gas to be cleaned is conveyed to an electro-precipitator, and means in the duct for distributing vaporized sulphur trioxide into the stream of gas to be cleaned comprising a series of side by side manifolds extending upwardly across the interior of the duct, each of said manifolds lying in planes substantially parallel to the direction of gas flow and being inclined upwardly and at an acute angle in the respective planes, and a series of nozzles projecting in the same direction from each manifold to extend substantially parallel to the direction of gas flow, said manifolds all being of substantially aerofoil configuration to reduce gas turbulence, and the outlets of the nozzles on each of said manifolds being staggered in the direction of gas flow so that solid material collecting at the outlet of an upper nozzle falls clear of the outlets of lower nozzles of that manifold.