NOx, Hg, and SO.sub.2 removal using alkali hydroxide
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United States of America Patent
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May 30, 2006
Issued Date -
N/A
app pub date -
Jun 28, 2002
filing date -
Dec 6, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process and apparatus for removing SO.sub.2, NO, and NO.sub.2 from a gas stream having the steps of oxidizing a portion of the NO in the flue gas stream to NO.sub.2, scrubbing the SO.sub.2, NO, and NO.sub.2 with an alkali scrubbing solution, and removing any alkali aerosols generated by the scrubbing in a wet electrostatic precipitator. The process can also remove Hg by oxidizing it to oxidized mercury and removing it in the scrubbing solution and wet electrostatic precipitator. Alkali sulfates, which are valuable fertilizers, can be withdrawn from the rubbing solution.
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