NOx, Hg, and SO2 removal using ammonia
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United States of America Patent
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Jan 31, 2006
Grant Date -
Jun 3, 2004
app pub date -
Dec 5, 2003
filing date -
Oct 9, 1996
priority date (Note) -
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Abstract
A process and apparatus for removing SO2, NO, and NO2 from a gas stream having the steps of oxidizing a portion of the NO in the flue gas stream to NO2, scrubbing the SO2, NO, and NO2 with an ammonia scrubbing solution, and removing any ammonia aerosols generated by the scrubbing in a wet electrostatic precipitator. The process can also remove Hg by oxidizing it to HgO and removing it in the wet electrostatic precipitator. Ammonium sulfate, a valuable fertilizer, can be withdrawn from the scrubbing solution.
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