B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
165/4
B01D 47/00 (2006.01) B01D 53/14 (2006.01) B01D 53/34 (2006.01) F23J 15/04 (2006.01)
Patent
CA 1120393
Abstract of the Disclosure A process for purifying the off-gases from indus- trial furnaces and especially from waste incineration plants is described in which process the off-gases which contain acid, neutral and/or basic pollutants in the gaseous or solid form or in the form of a mist, are treated in an evaporative cooler and then in a dry purifier, in which they are freed from at least a substantial portion of the solid pollutants, and finally in a scrubber by means of a wash liquid. The temperature of the off-gases in the evaporative cooler is kept above the dew point, and the wash liquid in the scrubber is cycled through a slurry separator, from which suspension or solution of pollutants is with- drawn from the sludge separator and fed into the evapora- tive cooler and mixed in a mixing space in the latter with the hot off-gases. Those walls of the evaporative cooler which come into contact with the mixture of off-gases and recycled suspension or solution of pollutants and which consist of a material that can be corroded by the said mixture at room temperature are heated from the outside to a temperature above the dew point. As a rule the pH value of the liquid phase in the sludge separator and in each of the gas wash stages of the scrubber directly upstream of the said separator is kept below 4.
316254
Fattinger Volker
Schneider Jurg
Ag Ciba-Geigy
Fetherstonhaugh & Co.
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