Efficient waste heat recovery process from sulfur containing...

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B01D 5/00 (2006.01) F22D 1/36 (2006.01) F23J 15/00 (2006.01) F23L 15/02 (2006.01)

Patent

CA 1253812

"EFFICIENT WASTE HEAT RECOVERY PROCESS FROM SULFUR CONTAINING FLUE GAS" Abstract In the recovery of waste heat from flue gas containing particulate solids, CO2, SO2, SO3 and H2O, several improvements are provided, e.g., passing hot flue gas, e.g., from a power plant, over heat exchange surface attackable by sulfuric acid, e.g., in a combustion air preheater, so as to release heat to said heat exchange surface and to partially cool said flue gas to a temperature within the range of about 350°F to above the condensation temperature of sulfuric acid; passing resultant partially cooled gas through a particulate removal zone to separate the particulate solids from the partially cooled flue gas, passing resultant solids-depleted, partially cooled flue gas to a regenerator containing heat exchange surface resistant to attack by sulfuric acid to release additional heat and to cool said flue gas to a temperature below the condensation temperature of sulfuric acid; and recovering the heat from the regenerator with air which is then passed through the air preheater to be used as combustion air for the furnace.

460492

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