Process for purifying flue gas containing nitrogen oxides

Details Process for purifying flue gas containing nitrogen oxides Process for purifying flue gas containing nitrogen oxides

B - Operations, Transporting

01

D

B01D 53/84 (2006.01) B01D 53/56 (2006.01) B01D 53/60 (2006.01)

Patent

CA 2211554

The invention provides a process and a device for purifying flue gas containing nitrogen oxides, in which the flue gas is scrubbed with a circulating scrubbing liquid which contains a transition metal chelate such as Fe(II) EDTA and the complex formed from nitrogen oxide and transition metal chelate and/or spent transition metal chelate is regenerated biologically in the presence of an electron donor, nitrogen oxide being reduced to molecular nitrogen. The biological reactor can be combined with the gas scrubber. The electron donor is, for example, hydrogen or methanol, but may also be sulphite which originates from sulphur dioxide in the flue gas.

Procédé et dispositif d'épuration de gaz de fumée renfermant des oxydes d'azote. On lave les gaz de fumée à l'aide d'un liquide de lavage en circulation qui contient un chélate de métal de transition tel qu'un Fe (II) EDTA et le complexe formé de l'oxyde d'azote et du chélate de métal de transition, et/ou on effectue la régénération biologique du chélate de métal de transition épuisé en présence d'un donneur d'électrons, l'oxyde d'azote étant réduit en azote moléculaire. Le réacteur biologique peut être associé au laveur de gaz. Le donneur d'électrons est, par exemple, de l'hydrogène ou du méthanol, mais il peut également être un sulfite issu du dioxyde de soufre contenu dans les gaz de fumée.

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