Improvements to methods for heat treating flue gas cleaning...

F - Mech Eng,Light,Heat,Weapons – 23 – G

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F23G 5/00 (2006.01) B01D 53/34 (2006.01) B01D 53/68 (2006.01) F23J 15/00 (2006.01)

Patent

CA 2187647

An improvement to methods for heat treating flue gas cleaning residues (1) and residues from the industrial process generating said flue gases. For this purpose, the method comprises a physicochemical treatment step (2, 7), a heat treatment step (13) and a step involving treating gases generated by said heat treatment (19, 22, 28). These three steps are closely overlapped and combined both to minimise the volatilisation of volatile compounds during heat treatment and to remove separately the elements that cannot effectively be immobilised in the treated residue matrix during said heat treatment. The physicochemical treatment step may advantageously be combined with the wet cleaning step that may be included in the industrial process flue gas cleaning step. The method is particularly suitable for melting/vitrifying fly ash, agglomerating the finest fly ash, and destroying organic compounds such as dioxins and furans.

L'invention a pour objet un prefectionnement aux procédés de traitement par voie thermique des résidus (1) d'épuration des fumées et des résidus du processus industriel émettant ces fumées. Pour cela le procédé comporte une étape de traitement physico-chimique (2, 7), une étape de traitement thermique (13) et une étape de traitement des fumées générées par le traitement thermique (19, 22, 28). Ces trois étapes sont étroitement imbriquées et combinées pour à la fois minimiser la volatilisation de composés volatilisables lors du traitement thermique et extraire séparément les éléments qui ne peuvent être immobilisés efficacement lors du traitement thermique dans la matrice des résidus traités. L'étape de traitement physico-chimique peut être utilement combinée avec l'étage d'épuration humide que peut comporter l'épuration des fumées du processus industriel. Le procedé s'applique notamment à la fusion/vitrification des cendres volantes, à l'agglomération des cendres volantes les plus fines, à la destruction de composés organiques tels que les dioxines et furannes.

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