Process of removing polluants from exhaust gases

Details Process of removing polluants from exhaust gases Process of removing polluants from exhaust gases

B - Operations, Transporting

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23/370

B01D 53/34 (2006.01) B01D 53/12 (2006.01) B01D 53/50 (2006.01) F23J 15/02 (2006.01)

Patent

CA 1212824

ABSTRACT OF THE DISCLOSURE: A process of removing polluants from exhaust gases a circulating fluidized bed, in which solids are circulated through a fluidized bed reactor, a separator and a return line, is used. For this purpose the exhaust gas is introduced as a fluidizing gas into a fluidized bed which consists of two solid fractions differing in particle size, namely, a coarse- grained fraction having a particle size dp 50 in the range of 150 to 500 µm and a fine-grained fraction having a particle size dp 50 below 10 µm. The coarse-grained solid fraction consists preferably of CaO, CaCO3, MgO, MgCO3, dolomite and/ or sand and the fine-grained solid fraction consists of Ca(OH)2 and respectively amount to 70 to 90 % by weight and 10 to 30 % by weight of the entire fluidized bed. A gas velocity of 1 to 10 m/sec and a mean suspension density of 0.2 to 2 kg/m3 are preferably maintained in the fluidized bed reactor.

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