Process for the removal of impurities from gas streams

摘要

The present invention relates to a process for removing nitrogen oxides, and mercury and, if present, sulfur oxides and mercuric oxide from gas streams such as furnace or utility boiler flue gas streams, particularly those derived from coal-fired utility boilers, or from a gas stream from another pollutant abatement process. Ozone will react with the impurities in the gas stream to form mercuric oxide and higher oxides of nitrogen which can be removed by scrubber means. Oxides of sulfur are removed in the scrubber means and/or upstream of the ozone reactor. Ultraviolet radiation may also be used to facilitate the removal of the impurities <IMAGE>