Apparatus for pollution contorl of furnace gases

Claim 2

A filter device comprising means defining a chamber including an elevated roof and means supporting granular filter material exhibiting a predetermined angle of repose providing converging lower side walls defined by the surface of the filter material which are downwardly inclined in accordance with the angle of repose; means defining a gas flow path into the chamber and then through the filter material including means connected to the first mentioned means for introducing particulate laden gas into the chamber; and means for removing filter material from the lower side walls and providing a relatively stationary zone of filter material surrounding the lower side walls including means for removing filter material substantially only from the converging lower side walls of the filter material and comprising outlet means disposed at the convergence of the lower side walls defining a passage for filter material.

Claim 3

A filter device comprising means defining a chamber including an elevated roof and means supporting granular filter material exhibiting a predetermined angle of repose providing converging lower side walls defined by the surface of the filter material which are downwardly inclined in accordance with the angle of repose; means defining a gas flow path into the chamber and then through the filter material including means connected to the first mentioned means for introducing particulate laden gas into the chamber; and means for removing filter material from the lower side walls and providing a relatively stationary zone of filter material surrounding the lower side walls including means for removing filter material substantially only from the converging lower side walls of the filter material and comprising outlet means disposed at the convergence of the lower side walls defining a passage for filter material.

Claim 4

A filter device comprising means defining a chamber including an elevated roof and means supporting granular filter material exhibiting a predetermined angle of repose providing converging lower side walls defined by the surface of the filter material which are downwardly inclined in accordance with the angle of repose; means defining a gas flow path into the chamber and then through the filter material including means connected to the first mentioned means for introducing particulate laden gas into the chamber; and means for removing filter material from the lower side walls and providing a relatively stationary zone of filter material surrounding the lower side walls including means for removing filter material substantially only from the converging lower side walls of the filter material and comprising outlet means disposed at the convergence of the lower side walls defining a passage for filter material.

Claim 5

The filter device of claim 1 further comprising means for gravitationally replenishing the filter material adjacent the chamber wherein the roof comprises upwardly converging sides defining a steeper angle than the angle of repose and means for delivering filter material to the top of the roof.

Claim 6

The filter device of claim 2 wherein the chamber defined by the upwardly converging roof sides and the downwardly converging lower side walls is a large flow area compared to the flow area of the gas introducing means, the chamber comprising a flow velocity reduction area for separating particles from the gas above a predetermined size.

Claim 7

The filter device of claim 3 wherein the gas introducing means comprises means defining a flow path for particles above the predetermined size including a segment passing downwardly toward the convergence of the chamber side walls.

Claim 8

The filter device of claim 1 wherein The last mentioned means comprise gate means disposed adjacent the convergence of the filter material defining a path of filter material removal parallel to the converging lower side walls of the filter material.

Claim 9

The filter device of claim 5 wherein the outlet means comprises downwardly inclined convergent sides providing an opening at the lower end thereof and means for selectively closing the opening.

Claim 10

The filter device of claim 6 further comprising means for raising and lowering the outlet means for altering the distance between the outlet sides and the chamber side walls for altering the quantity of material removed from the device.

Claim 11

The filter device of claim 5 further comprising means for raising and lowering the gate means within the particulate material for altering the quantity of material removed from the device.

Claim 12

A filter device comprising means defining a chamber including a roof and means supporting granular filter material exhibiting a predetermined angle of repose providing a flow velocity reduction chamber for separating particles from a gas above a predetermined size, the chamber having a top defined by the roof and converging lower side walls, defined by the filter material, downwardly inclined in accordance with the angle of repose; means defining a gas flow path into the chamber and then through the filter material including means connected to the chamber for introducing particular laden gas into the chamber, the gas introducing means having a smaller flow area than the chamber and defining a path of uninterrupted falling movement for the particles above the predetermined size generally downwardly into the convergence of the lower side walls; and means for removing particles accumulating in the convergence of the lower side walls comprising gate means disposed at the chamber convergence

Claim 13

A filter device comprising means defining a chamber including a roof and means supporting granular filter material exhibiting a predetermined angle of repose providing a flow velocity reduction chamber for separating particles from a gas above a predetermined size, the chamber having a top defined by the roof and converging lower side walls, defined by the filter material, downwardly inclined in accordance with the angle of repose; means defining a gas flow path into the chamber and then through the filter material including means connected to the chamber for introducing particular laden gas into the chamber, the gas introducing means having a smaller flow area than the chamber and defining a path of uninterrupted falling movement for the particles above the predetermined size generally downwardly into the convergence of the lower side walls; and means for removing particles accumulating in the convergence of the lower side walls comprising gate means disposed at the chamber convergence