Process for the removal of NOx, SOx and contaminants from gas streams

摘要

The present invention provides for a method and apparatus for removing oxides of nitrogen and oxides of sulfur from a gas stream such as a flue gas stream from an industrial process. The process utilizes a prescrubber A to contact the gas stream before the gas stream contacts ozone in an oxidizer zone B. Oxides of sulfur are removed in the prescrubber A, whereas lower oxides of nitrogen and heavy metals such as mercury are oxidised to more soluble higher oxides of nitrogen in the oxidation zone B. The oxidized gas is then treated to either first and second scrubber operations or just a single scrubber operation to remove residual oxides of sulfur, excess ozone and the oxides of nitrogen. <IMAGE>