| 摘要 |
A pipe curtain is formed by a plurality of pipes independently suspended at one end portion to an outwardly extending flange positioned around a pollution control hood positioned at the discharge of a metallurgical furnace. Molten metal is transferred from the furnace to a metal transporting vessel through a trough, spout or the like. The hood is positioned above the trough and fans for the hood draw emissions, such as gaseous and particulate pollutants emitted from the molten metal, into the hood. The vertically suspended pipes are positioned in close relation to each other and substantially enclose the space between the bottom edge of the hood and the upper edge of the trough. With this arrangement the pipes form a curtain that prevents the air entrained pollutants emitted from the molten metal from escaping out from beneath the hood to the surrounding atmosphere. The pipe curtain substantially reduces the volume of surrounding air drawn into the hood to thereby permit use of fans and other pollution control equipment of reduced capacity. The pipes have sufficient weight not to be displaced from their vertically suspended position by the air flow into the hood. The pipes are also individually, movably connected to the hood to permit access to the space beneath the hood while the curtain remains substantially in position to prevent the escape of pullutants.
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