Boiler and regenerative air preheater arrangement to enhance SO3 capture
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United States of America Patent
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Nov 4, 2003
Grant Date -
N/A
app pub date -
Mar 7, 2003
filing date -
Mar 7, 2003
priority date (Note) -
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Abstract
An air preheater for use with a boiler which discharges a flow of flue gas containing SO.sub.3 comprises a housing having oppositely disposed hot and cold ends. The hot end includes an air outlet duct, having a combustion air duct and an excess air duct, and a flue gas inlet duct, the combustion air duct and flue gas inlet duct are in fluid communication with the boiler. The cold end includes an air inlet duct and a flue gas outlet duct in fluid communication with the atmosphere. A rotor rotatably mounted in the housing includes an air sector in fluid communication with the air inlet and outlet ducts and a flue gas sector in fluid communication with the flue gas inlet and outlet ducts. A plurality of heat exchange element basket assemblies rotate through the air and flue gas sectors, with the heat exchange element basket assemblies absorbing heat from the flow of flue gas in the flue gas sector and discharging heat to the flow of air in the air sector. The flow of excess air cools the heat exchange basket element assemblies below the dew point of the SO.sub.3, thereby condensing the SO.sub.3 for removal from the flow of flue gas.
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