Method for treating a combustion exhaust gas using a...

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23/341

B01D 53/60 (2006.01)

Patent

CA 1340720

A method for treating a combustion exhaust gas from an incinerator or from a metal smelting furnace, comprising the steps of: supplying powdered slaked lime to a combustion exhaust gas containing at least some of sulfur oxides, nitrogen oxides, hydrogen chloride, hydrogen fluoride and dust; subsequently introducing at least one material selected from ammonia, ammonia solution or urea solution into the combustion exhaust gas; causing the combustion exhaust gas aupplied with powdered slaked lime and combined with at least one of those materials to pass through a catalyst filter, wherein catalyst particles which are made of titanium oxide and vanadium oxide or of titanium oxide, vanadium oxide and tungsten oxide and which have diameters between 0..01 and 1 µm are carried by the filter, and wherein that filter is made by weaving monofilaments of a glass fiber with diameters between 3 and 15 µm so that the filter has a density of 400 to 1000 g/m2. Preferably, the weight ratio of the catalyst components is TiO2 : V2Ox : WO x = 90-95 : 1-10 : 0-5, and the amount of the catalyst attached to the filter is 1 to 20 weight %.

616974

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