Method and apparatus for limiting emissions from a contained vessel
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United States of America Patent
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Jun 12, 2001
Grant Date -
N/A
app pub date -
Aug 5, 1999
filing date -
Aug 5, 1999
priority date (Note) -
Expired
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Abstract
The need to filter gas emanating from a containment vessel is reduced or eliminated by maintaining, within the vessel, a gradient that concentrates most of the gaseous contaminants away from the vessel exits. This is achieved by reducing the density of gas drawn from the region near its source and discharging the reduced-density gas to another region of the vessel. Owing to its reduced density, the discharged gas already has a lower contaminant concentration than the source gas. The concentration decreases further as convection draws the discharged gas back to its source. So long as the gas flows within the containment vessel are non-turbulent, the concentration gradient remains substantially static, and the vents remain exposed only to low concentrations of contaminants. The gas density may be reduced by heating and humidification, catalytic reaction, or reaction among constituents of the gas.
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