Patent ID: 8142551

Claim:
A filtration apparatus for filtering solid particles from a gas, with capturing solids, comprising: a casing defining an inner cavity with an upper cylindrical portion, and a lower hopper portion connected to the upper cylindrical portion; at least one inlet in the upper cylindrical portion for feeding a flow of gas and solids into the inner cavity, the at least one inlet being positioned with respect to the casing to cause movement of the solids in a downward spiral path in the casing; a solids outlet at a bottom of the lower hopper portion for outletting the solids from the casing; a gas outlet in the upper cylindrical portion to exhaust gases from the casing; an annular arrangement of ports in a wall of the lower hopper portion of the casing to inject an other gas into the inner cavity, the ports being oriented so as to guide the other gas into following a path at least partially vertical when entering the inner cavity to disrupt the movement of the solids in the downward spiral path to allow a capture of the solid particles by the capturing solids; and a gas source connected to the arrangement of ports for the injection of the other gas into the inner cavity.