Method and device for the catalytically treating exhaust gas containing dust and oxygen
OwnerGurudas Samant, Gerd Sauterinventors
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Abstract
Process for the treatment of dust- and oxygen-containing exhaust gases which contain sulfur oxides and nitrogen oxides which comprises treating said gases in a reactor at temperatures in the range of 200° to 500° C. and in the presence of a catalyst having free opening surfaces of more than 50% and passages with a hydraulic diameter of more than 2 mm and one or more substances selected from the group consisting of free oxides, carbonates, hydroxides of calcium, magnesium, sodium and potassium and at a Froude number in the range of 1 to 100.
Claims15
A process for the treatment of dust- and oxygen-containing exhaust gases, which contain sulfur oxides and nitrogen oxides, at temperatures in the range from 200° C. to 500° C. by means of reducing agents in a reactor (19) which is equipped with solid catalyst (20) with flow passages, in which the free opening surface of the catalyst (20) is more than 50% and in which the passages of the catalyst (20) have a hydraulic diameter of more than 2 mm, characterized in that
- a) the treatment in the reactor (19) is performed in the presence of and/or with the addition of one or more substances selected from free oxides, carbonates, hydroxides of calcium, magnesium, sodium and potassium,
- b) during the treatment, the operating conditions of the gas flow in the free reaction space are adjusted corresponding to the Froude numbers in the range of
- 2 1 ≤ 3 / 4 · μ 2 g · d k · ρ g ρ k - ρ g ≤ 100 with μ 2 g · d k = Fr 2 .
An apparatus for the treatment of dust- and oxygen-containing exhaust gases of a cement factory, which exhaust gases contain sulfur oxides and nitrogen oxides, characterized in that the reactor (19) equipped with catalyst (20) is disposed in the exhaust gas stream behind the cyclone heat exchanger (13) (and before the raw material grinder (21) and before the bypass I to the evaporative cooler (22)).
Dependencies are inferred from the claim text.