Method and apparatus utilising hydrogen peroxyde to reduce...

B - Operations – Transporting – 01 – D

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B01D 53/60 (2006.01) B01D 53/56 (2006.01) B01D 53/64 (2006.01) B01D 53/75 (2006.01) C01B 17/05 (2006.01) C01B 17/50 (2006.01) C01B 21/40 (2006.01)

Patent

CA 2565750

Methods and apparatus utilizing hydrogen peroxide are useful to reduce SOx and mercury (or other heavy metal) emissions from combustion flue gas streams. The methods and apparatus may further be modified to reduce NOx emissions. Continuous concentration of hydrogen peroxide to levels approaching or exceeding propellant-grade hydrogen peroxide facilitates increased system efficiency. In this manner, combustion flue gas streams can be treated for the removal of SOx and heavy metals, while isolating useful by-products streams of sulfuric acid as well as solids for the recovery of the heavy metals. Where removal of NOx emissions is included, nitric acid may also be isolated for use in fertilizer or other industrial applications.

Des procédés et un appareil utilisant le peroxyde d'hydrogène sont utiles pour réduire les émissions de SO¿x? et de mercure (ou d'autres métaux lourds) provenant de fumées de combustion. Les procédés et l~appareil peuvent de plus être modifiés pour réduire les émissions de NO¿x?. Une concentration continue de peroxyde d'hydrogène à des niveaux approchant ou excédant le peroxyde d~hydrogène de niveau propulseur facilite l'efficacité améliorée du système. De cette façon, les courants de fumée de combustion peuvent être traités pour extraire les SO¿x? et les métaux lourds, tout en isolant les courants de sous-produits utiles d'acide sulfurique ainsi que de solides pour récupérer les métaux lourds. Lorsque l~extraction des émissions de NO¿x? est incluse, l'acide nitrique peut aussi être isolé pour être utilisé dans les engrais ou d~autres applications industrielles.

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