Patent ID: 7309384
Filing Date: 2007-12-18
Classification: B01D

Abstract:
1. A method for filtering gas with a moving granular filter bed, comprising, providing a cylindrical filter compartment having a top, bottom, and cylindrical side walls, providing an upward compartment portion below the top of the filter compartment, and having a bottom portion with an opening therein, providing a conduit extending through the top of the filter compartment and through the opening in the bottom partition of the upper compartment portion, providing that the opening in the bottom partition of the upper compartment is sufficiently large to create a space around the hollow conduit, providing a screen mesh for covering the space around the hollow conduit, providing a gas engagement portion in the cylindrical filter compartment which has a diameter greater than the space around the hollow conduit to receive a quantity of filter material moving through the hollow conduit, passing a quantity of particulate filter material through the hollow conduit and into the gas engagement portion of the cylindrical filter compartment, restraining the vertical flow of particulate filter material downwardly through the gas engagement portion sufficiently to create a quantity of filter material sufficient to engage the entire area of the screen mesh, introducing a jet of horizontal gas tangentially into the gas engagement portion to direct gas in a cyclonic direction around the moving granular filter material in the gas engagement portion, and providing a gas exit port in the upper compartment portion to permit the exit of gas therefrom which has migrated through the particulate filter material in the gas engagement portion, thence through the screen mesh, and thence into the upper compartment.