Process for removing sulfur dioxide from flue gases
First Claim
1. In a dry process for the removal of sulfur dioxide from flue gases by the addition thereto of hydrated lime containing sugar in a coal combustion unit, wherein the flue gases result from the combustion of coal in a combustion chamber, and the flue gases are treated in an electrostatic precipitator prior to discharge to the atmosphere, the improvement comprising:
- passing said flue gases, after the addition of said hydrated lime containing sugar, wherein said hydrated lime is of fine particles of a specific surface of 7 to 25 square meters per gram, through a conduit towards said electrostatic precipitator; and
adding an aqueous media to said flue gases in said conduit in an amount to increase the water content of the flue gases and cool the same by evaporative cooling to a temperature no lower than 20°
F. above the dew point of the gas, so as to avoid forming water droplets in the gas, so as to prevent condensation of water therefrom.
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Accused Products
Abstract
Sulfur dioxide is removed from flue gases resulting from combustion of sulfur-containing coal in a coal combustion unit by contacting the gases in the coal combustion unit with hydrated lime containing sugars and then adding an aqueous media, preferably containing an alkali metal compound, to the gases in ductwork leading from the coal combustion unit to an electrostatic precipitator.
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Citations
6 Claims
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1. In a dry process for the removal of sulfur dioxide from flue gases by the addition thereto of hydrated lime containing sugar in a coal combustion unit, wherein the flue gases result from the combustion of coal in a combustion chamber, and the flue gases are treated in an electrostatic precipitator prior to discharge to the atmosphere, the improvement comprising:
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passing said flue gases, after the addition of said hydrated lime containing sugar, wherein said hydrated lime is of fine particles of a specific surface of 7 to 25 square meters per gram, through a conduit towards said electrostatic precipitator; and adding an aqueous media to said flue gases in said conduit in an amount to increase the water content of the flue gases and cool the same by evaporative cooling to a temperature no lower than 20°
F. above the dew point of the gas, so as to avoid forming water droplets in the gas, so as to prevent condensation of water therefrom. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification