Flue gas conditioning system and method using native SO.sub.2 feedstock
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United States of America Patent
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Sep 9, 1997
Issued Date -
N/A
app pub date -
Nov 19, 1996
filing date -
Apr 12, 1994
priority date (Note) -
Expired
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Abstract
A flue gas conditioning system and method generates and introduces sulfur trioxide into flue gas produced by a boiler to condition the flue gas before it passes through an electrostatic precipitator. Flue gas is withdrawn from the flue duct which couples the boiler to the electrostatic precipitator and cleaned to provide a source of sulfur dioxide. The withdrawn flue gas is passed through a heater and then into a catalytic converter which converts native SO.sub.2 in the flue gas into SO.sub.3 which is then introduced back into the flue duct to condition the flue gas. The SO.sub.3 feedrate is controlled by varying the setpoint temperature at the inlet of the catalytic converter which varies the efficiency of the catalytic converter,
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