SO3 MIST COLLECTION DEVICE

摘要

PROBLEM TO BE SOLVED: To remove SO3 contained in an exhaust gas without expanding the size of a device even when an oil containing a large amount of sulfur is burned by maintaining a cooling face formed of a group of heat transfer pipes at a lower temperature than the dew point of the SO3 gas in a casing for flowing the SO3 gas, and collecting the SO3 gas through causing the SO3 gas to build up on the cooling face as an SO3 mist. SOLUTION: An exhaust gas is directed downward by straightening its flow with the help of a guide vane 3 in a casing 2 for an exhaust gas collection device 1 and then is exhausted from the lower part of the device 1 passing through the cluster of heat transfer pipes 4. Further, plural heat transfer pipes 6 for flowing a hot water 7 from a heat transfer medium into a gap between the pipes 6, are installed between barrier plates 5, 5' provided perpendicularly at a specified interval in the moving direction of the exhaust gas inside the casing 2. Thus the temperature of an SO3 gas in the inner faces of the heat transfer pipes 6 is made lower than the dew point of the SO3 gas with the hot water 7. A gaseous SO3 mist contained in the exhaust gas condensates on the inner faces of the heat transfer pipes 6 and the built-up SO3 mist is washed by an alkaline liquid from a cleaning nozzle 8. Consequently, a chemical compound 10 of sulfuric acid and the alkaline liquid is collected in a storage part 9 and the SO3 mist can be collected at a high efficiency, enabling minimize the volume of the device 1.