NOX, HG, AND SO2 REMOVAL USING AMMONIA

摘要

A process and apparatus for removing SO2, NO, and NO2 from a gas stream havingthesteps of oxidizing (60) a portion of the NO in the flue gas stream to NO2,scrubbing (62)the SO2, NO, NO2 with an ammonia scrubbing solution, and removing (64) anyammoniaaerosols generated by the scrubbing in a wet electrostatic precipitator. Theprocess canalso remove Hg by oxidizing it to HgO and removing it in the wet electrostaticprecipitator. Ammonium sulphate, a valuable fertilizer, can be withdrawn fromthescrubbing solution.