Process for the removal of impurities from gas streams

B - Operations – Transporting – 01 – D

Patent

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Details

B01D 53/75 (2006.01) B01D 47/00 (2006.01) B01D 53/34 (2006.01) B01D 53/60 (2006.01) B01D 53/64 (2006.01)

Patent

CA 2431460

The present invention relates to a process for removing nitrogen oxides, sulfur dioxides and mercury from gas streams such as furnace or utility boiler flue gas streams, particularly those derived from coal-fired utility boilers. A stream containing relatively low concentration of ozone from an ozone concentrator is feed to a barrier discharge reactor. Nitrogen oxides and mercury in the flue gas are oxidized by oxygen and hydroxyl radicals formed in the reactor. The flue gas is then directed to a reactor duct along with the ozone at a greater concentration wherein the remaining nitrogen oxides and mercury in the gas stream will react with the ozone to form nitric acid, nitric acid precursors, mixtures thereof and mercuric oxide. These impurities can then be removed from the gas stream by use of an aqueous scrubber, a wet electrostatic precipitator, a dry scrubber or a semi-dry scrubber.

La présente invention a pour objet un procédé pour éliminer les oxydes d'azote, le dioxyde de soufre et le mercure de circuits de gaz tels que des circuits de gaz provenant de cheminée de chaudière ou de four, en particulier ceux provenant de chaudières à charbon. Un circuit contenant une concentration relativement faible d'ozone provenant d'un concentrateur d'ozone alimente un réacteur à décharge à barrière. Les oxydes d'azote et le mercure du gaz de cheminée sont oxydés par de l'oxygène et des radicaux hydroxyles formés dans le réacteur. Le gaz de cheminée est ensuite dirigé avec l'ozone a une concentration plus grande vers le conduit d'un réacteur, dans lequel le mercure et les oxydes d'azote restants du circuit de gaz réagissent avec l'ozone pour former de l'acide nitrique, des précurseurs de l'acide nitrique, des mélandes de ceux-ci et de l'oxyde mercurique. Ces impuretés peuvent ensuite être éliminées du circuit gazeux grâce à un épurateur à phase aqueuse, un précipitateur électrostatique humide, un épurateur sec ou semi-sec.

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