NOX. HG. AND SO2 REMOVAL USING AMMONIA

摘要

A process and apparatus for removing SO?2#191, NO, and NO?2#191 from a gas stream having the steps of oxidizing (60) a portion of the NO in the flue gas stream to NO?2#191, scrubbing (62) the SO?2#191, NO, and NO?2#191 with an ammonia scrubbing solution, and removing (64) 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 Ammonium sulfate, a valuable fertilizer, can be withdrawn from the scrubbing solution.