Air pollution control device

Claim 2

In combination with a plenum chamber from which a gas having particulate solids entrained therein is withdrawn into an updraft flow, means for removing the particulate solids from the gas, comprising plural housing means enclosing a plurality of treating zones, converging wall means fixedly mounted within the housing for directing an axial inflow and outflow of the gas relative to said treating zones, said wall means including a plurality of vertically spaced conical wall sections between which a plurality of said treating zones are formed, impeller means rotatably mounted within the treating zones for inducing flow of the gas radially outward to maintain the gas in a state of turbulence, means for injecting a liquid into the axial inflow of the gas entering the impeller means for mixing with the particulate solids to form a slurry, and means mounted by the housing within said treating zones below the impeller means for baffling downflow of said slurry emerging from the impeller means with said radially outward flow of the gas, each of said conical wall sections and the baffling means of an adjacent one of the treating zones forming an outward passage conducting the slurry radially outward.

Claim 3

The combination of claim 1 wherein said liquid injecting means includes a tubular shaft extending through the treating zone, a supply conduit connected to the shaft and orifice means in the shaft for discharging an inflow of the liquid into the treating zone.

Claim 4

The combination of claim 1 wherein the housing encloses an annular outlet conduit in fluid communication with the outflow passage.

Claim 5

The combination of claim 3 wherein said liquid injecting means includes a tubular shaft extending through the treating zones, a supply conduit connected to the shaft and orifice means in the shaft for discharging the liquid in parallel into the impeller means in each of the treating zones.

Claim 6

The combination of claim 4 including fluid motor means mounted on the tubular shaft for imparting rotation to the impeller means in response to flow of the liquid into the treating zones.

Claim 7

In combination with a plenum chamber from which a mixture of gas and particulate solids are withdrawn into an updraft flow, means for substantially separating the particulate solids from the mixture comprising a housing having an outlet portion and an inlet portion opening into the plenum chamber, impeller means rotatably mounted within the housing for maintaining the upflowing mixture in a state of turbulence, means for injecting liquid under pressure into the upfloWing mixture, and means for withdrawing a slurry of said particulate solids and the liquid from the housing, the impeller means including a plurality of blade assemblies from which the slurry is centrifugally discharged, said housing enclosing vertically spaced stages respectively including each of said blade assemblies, each stage having an upper wall formed with an opening communicating with the blade assemblies of a following one of the stages, an annular housing section connected to the upper wall and a lower baffle formation, said slurry withdrawing means including a vertical annular outlet conduit and a plurality of passages between the upper walls and the baffle formations of adjacent stages in fluid communication with said outlet conduit.

Claim 8

In combination with a plenum chamber from which a mixture of gas and particulate solids are withdrawn into an updraft flow, means for substantially separating the particulate solids from the mixture comprising a housing having an outlet portion and an inlet portion opening into the plenum chamber, impeller means rotatably mounted within the housing for maintaining the upflowing mixture in a state of turbulence, means for injecting liquid under pressure into the upfloWing mixture, and means for withdrawing a slurry of said particulate solids and the liquid from the housing, the impeller means including a plurality of blade assemblies from which the slurry is centrifugally discharged, said housing enclosing vertically spaced stages respectively including each of said blade assemblies, each stage having an upper wall formed with an opening communicating with the blade assemblies of a following one of the stages, an annular housing section connected to the upper wall and a lower baffle formation, said slurry withdrawing means including a vertical annular outlet conduit and a plurality of passages between the upper walls and the baffle formations of adjacent stages in fluid communication with said outlet conduit.

Claim 9

The combination of claim 6 wherein said means for injecting liquid includes a tubular shaft extending vertically through the housing on which the impeller means is mounted, a supply conduit connected to the shaft, and orifice means in the shaft for discharging the liquid adjacent to the impeller means.

Claim 10

The combination of claim 7 including fluid motor means mounted on the tubular shaft and driven by the inflow of liquid for imparting rotation to the impeller means.

Claim 11

The combination of claim 2 including fluid motor means mounted on the tubular shaft and driven by the inflow of liquid for imparting rotation to the impeller means.