Method and apparatus for controlling gas flow

Claim 3

A method in accordance with claim 1, wherein the gas handling system is a gas discharge system associated with a material processing furnace for removing off-gases therefrom, and the control gas is atmospheric air.

Claim 4

A method according to claim 2, wherein atmospheric air is blown from a source of same toward the location of introduction of the control gas into the conduit; and wherein either all or part of said air is directed to and discharged into said conduit at said location, or either all or part of same is directed to and discharged into said conduit at a location beyond the first-named location.

Claim 5

In a gas handling system having a conduit for the flow of gas, which conduit has an abrupt bend therein, means for introducing a control gas into the conduit in opposition to the normal through-flow of gas in the conduit and at a flow rate effective to accomplish the degree of control of said normal through-flow desired through a range of substantially no normal flow to substantially full normal flow, said means comprising a source of control gas under pressure; a duct leading from said source to a location of gas introduction into said conduit; and nozzle means at said location for introducing control gas into said conduit from said duct, said nozzle means being disposed substantially entirely outside said conduit but with the discharge therefrom directed into said conduit at the said bend thereof in direct opposition to the normal flow of gas therethrough and made up of a series of individual nozzles arranged in side-by-side adjacency and having respective, elongate, discharge orifices that extend substantially entirely across the confronting cross-sectional area of the conduit in one dimension of said area, the said series extending substantially entirely across said area normal to said one dimension thereof.

Claim 6

In a gas handling system having a conduit for the flow of gas, which conduit has an abrupt bend therein, means for introducing a control gas into the conduit in opposition to the normal through-flow of gas in the conduit and at a flow rate effective to accomplish the degree of control of said normal through-flow desired through a range of substantially no normal flow to substantially full normal flow, said means comprising a source of control gas under pressure; a duct leading from said source to a location of gas introduction into said conduit; and nozzle means at said location for introducing control gas into said conduit from said duct, said nozzle means being disposed substantially entirely outside said conduit but with the discharge therefrom directed into said conduit at the said bend thereof in direct opposition to the normal flow of gas therethrough and made up of a series of individual nozzles arranged in side-by-side adjacency and having respective, elongate, discharge orifices that extend substantially entirely across the confronting cross-sectional area of the conduit in one dimension of said area, the said series extending substantially entirely across said area normal to said one dimension thereof.

Claim 7

A combination according to claim 4, wherein there is additionally included a second duct leading from the source of control gas under pressure to a second location of gas introduction into said conduit that is disposed beyond the first location; a valve for controlling flow of control gas through the first duct; and a valve for controlling flow of control air through the second duct.