Method and apparatus for conditioning flue gas with a...

Details Method and apparatus for conditioning flue gas with a... Method and apparatus for conditioning flue gas with a...

B - Operations, Transporting

03

C

183/42

B03C 3/01 (2006.01) B01D 51/10 (2006.01)

Patent

CA 1132063

METHOD AND APPARATUS FOR CONDITIONING FLUE GAS WITH A VAPORIZED MIST OF H2SO4 ABSTRACT In order to reduce the electrical resistance of entrained fine particles of fly ash resulting from the burning of low sulfur coal and to enhance the efficiency of their collection by an electrical precipitator means, there is a conditioning of the particles carried in the flue gas stream by having a vapor of H2SO4 condensed and adsorbed on the particles themselves. Sulfuric acid at ambient temperature is mixed with air in an acoustic nozzle to form a mist having an average particle size of about 10 microns which is injected uniformly into a cyclonically flowing stream of hot gas in a chamber located adjacent an upstream inlet duct portion of the precipitator unit. The hot gas in the chamber vaporizes the acid which is then injected into the precipitator inlet duct so that the acid can condense on the particles. The hot gas is preferably obtained from the combustion air preheater.

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