Prevention of formation and destruction of organohalogen...

B - Operations – Transporting – 01 – D

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B01D 53/70 (2006.01) F23G 7/00 (2006.01) A62D 3/00 (2006.01)

Patent

CA 2180633

Organohalogen compounds (OHC), including dioxins and furans, produced in waste incinerators are destroyed by introducing inorganic bases, either alone or in combination with aliphatic hydroxy compounds, into an incineration post combustion zone that contains gaseous incineration products. The destroyer compounds may also serve to inhibit the formation of OHC by catalysis at active sites on flyash produced in the incineration and also to remove acid gases from the gaseous incineration products. In this way, the concentration of OHC on flyash precipitated from the product gas stream is decreased as dioxins and acid gas concentrations in stack emissions from the incineration process also decreases.

Des composés organohalogénés (OHC), comprenant des dioxines et des furannes et produits dans des incinérateurs de déchets sont détruits par l'introduction de bases inorganiques, soit seules soit en combinaison avec des composés hydroxy aliphatiques, dans une zone de post-combustion d'un incinérateur qui contient des produits d'incinération gazeux. Les composés destructeurs sont également susceptibles d'inhiber la formation d'OHC par catalyse au niveau des sites actifs sur les suies produites au cours de l'incinération, tout en étant aptes à enlever des gaz acides des produits d'incinération gazeux. Ce procédé permet ainsi de réduire la concentration d'OHC sur la suie précipitée hors du courant gazeux émis, ainsi que les concentrations de dioxines et de gaz acides dans les émissions de cuve d'incinération provenant du procédé d'incinération.

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