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US 10,376,834 B2Granted
Continuous process and apparatus for purifying SO2-containing gases
AssigneeChemetics Inc.
InventorsTorsten Weber, Bernd Erkes, Lucia Fernandez Lopez
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Abstract
The invention relates to a continuous process for purifying a gas containing 60-99 percent SO2 (sulfur dioxide) by volume and 1 to 40 percent steam by volume, followed by synthesis of SO3 (sulfur trioxide) without first drying the gas, and to an apparatus for carrying out said method.
Claims27
A method for the purification of SO2-containing exhaust gases, comprising the following steps:
- (a) introducing the SO2-containing exhaust gas into a gas scrubber and absorbing SO2 in the scrubbing liquid,
- (b) supplying the scrubbing liquid loaded with SO2 into the desorber, desorbing SO2 under generation of SO2-containing rich gas and returning the SO2 deplenished scrubbing liquid into the gas scrubber,
- (c) supplying the SO2-containing rich gas into a gas pre-heater, wherein air is added to the SO2-containing rich gas before it enters the gas pre-heater,
- (d) heating the SO2-containing rich gas with the added air in the gas preheater,
- (e) oxidizing the SO2 contained in the SO2-containing rich gas to SO3 in a tube contacting device,
- (f) absorption of the resulting SO3 in a SO3-absorber,
- (g) discharging gases that have not been absorbed in the SO3-absorber and supplying these gases into the SO2-containing exhaust gas before it enters the gas scrubber,
- wherein the air that is added to the SO2-containing rich gas before it enters the gas pre-heater in step (c) has a temperature that is higher than the temperature of the SO2-containing rich gas.
5 more elements
Dependencies are inferred from the claim text.