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Abstract

An apparatus (1) for filtering dust from a gas has a dynamic gas treatment region (54) defined by inflow screen (3) and outflow screen (53). A quantity of filter medium (5) from hopper (13) vertically traverses the gas treatment region (54) as dust-laden gas from gas inlet (14) contacts the filter medium (5) and moves through the gas treatment region (54) horizontally to gas outlet (15). Filter medium (5) which takes dust from the gas that is treated falls to the bottom of the gas treatment region (54). A first filter medium discharge device (8) is installed at the bottom of the gas treatment region (54) at the inflow side; and, a second filter medium discharge device (9) is installed at the outlet side at the bottom of the gas treatment region (54). The first and second discharge devices (8) and (9) are operated at different discharge rates, thus providing distinct inlet filter subregion (4a) and a distinct outlet filter subregion (4b) in the gas treatment region (54). The inflow screen (3) may be provided with louver plates (21) to cause a portion of the filter medium (5) to overflow toward the gas inlet (14) in a direction having a direction component anti-parallel to the direction of gas inflow.

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