Process of afterburning and purifying process exhaust gases

Details Process of afterburning and purifying process exhaust gases Process of afterburning and purifying process exhaust gases

B - Operations, Transporting

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B01D 53/34 (2006.01) B01J 8/26 (2006.01) C21B 7/00 (2006.01) C22B 1/10 (2006.01) F23G 5/30 (2006.01) F23G 7/06 (2006.01) F27D 17/00 (2006.01)

Patent

CA 1204274

ABSTRACT OF THE DISCLOSURE: A process of afterburning and purifying process exhaust gases, which contain combustible constituents, is simplified and a satisfactory combustion of the process exhaust gases is ensured in that the process exhaust gases and the oxygen-containing gases required for a combustion are separately supplied to a fluidized bed reactor of a circulating fluidized bed. In the fluidized bed reactor, the gas velocity is adjusted to 2 to 10 m/s (empty pipe velocity), the mean suspension density is adjusted to 0.1 to 10 kg/m3, the temperature is adjusted to 700 to 1100°C, and the stoichiometric ratio of gas-purifying agent having a particle size dp 50 of 30 to 200 µm to polluant contained in the process exhaust gas or formed by the combustion is adjusted to 1.2 to 3.0, calculated as Ca:S. The solids entrained by the gases from the fluidized-bed reactor are recycled to the fluidized bed reactor in such a manner that the quantity of solids circulated per hour in the circulating fluidized bed is at least 5 times the weight of solids con- tained in the fluidized bed reactor. In a preferred embodi- ment, exhaust gas from a pellet-firing machine or a sintering plant, preferably from a region having a high SO2 concentra- tion, is used as an oxygen-containing gas and the oxygen- containing gas is supplied at such a rate that the resulting flue gas has an oxygen-content of 2 to 10 % by volume.

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