Method for removing acid gases from flue gas

Details Method for removing acid gases from flue gas Method for removing acid gases from flue gas

1998-10-13

2000-10-03

Griffin, Steven P.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

423240R, 42324308, 42324309, B01D 5340, B01D 5350

Patent

active

061269107

ABSTRACT:
A method is provided for removing contaminants, such as sulfur trioxide, sulfur dioxide and hydrogen halides, out of a gas, such as an exhaust gas from a coal or oil fired burner, by injecting a bisulfite containing solution into the gas so that the bisulfite reacts with the sulfur trioxide and/or hydrogen halides in the gas to produce salts and sulfur dioxide, or by injecting a sulfite containing solution into the gas so that the sulfite reacts the sulfur dioxide in the gas to produce bisulfite and this bisulfite reacts with the sulfur trioxide and/or hydrogen halides to result in the formation of salts and sulfur dioxide. The sulfur dioxide in the gas can be washed out of the gas in a downstream wet scrubber. By removing the sulfur trioxide and/or hydrogen halides out of the gas, corrosion of the gas scrubbing apparatus can be reduced.

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Kohl et al. Gas Purification 4th Edition, Gulf Publishing Co., Houston TX USA, ISBN 0-87201-314-6, pp. 333-334, 1985.

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