초록 ▼

A method of desulfurization of flue gas involves the use of two recirculating water systems separated by a secondary cooling stage. In the first system, partial cooling and removal of some particulates and SO3 is effected by direct contact of the gas and water, followed by the secondary cooling whic

A method of desulfurization of flue gas involves the use of two recirculating water systems separated by a secondary cooling stage. In the first system, partial cooling and removal of some particulates and SO3 is effected by direct contact of the gas and water, followed by the secondary cooling which further removes particulates and SO3 in the condensate. In the second recirculating water system, SO2 is first absorbed under atmospheric conditions and is then desorbed under vacuum conditions to effect refrigeration of the recirculating water. The refrigerating effect is balanced against the contact and secondary cooling of the gas to stabilize the temperature at which absorption takes place such that a selected percentage of SO2 is removed from the gas.

대표청구항 ▼

The method of removing particulates, SO2 and SO3 from an effluent gas, which comprises the steps of; (a) contacting the effluent gas with water in a first stage closed recirculating water system and recovering the gas with particulates and SO3 partially removed therefrom; (b) cooling the gas recover

The method of removing particulates, SO2 and SO3 from an effluent gas, which comprises the steps of; (a) contacting the effluent gas with water in a first stage closed recirculating water system and recovering the gas with particulates and SO3 partially removed therefrom; (b) cooling the gas recovered from step (a) to a temperature sufficient to cause condensation of water vapor whereby further to remove particulates and SO3 all of which are returned to step (a), and recovering the cooled gas; (c) in a further stage isolated both as to liquid and vapor phases from those of steps (a) and (b), first absorbing SO2 from cooled gas from step (b) under substantially atmospheric pressure by contact with water flowing in a second closed system to produce water plus absorbed SO2 at a temperature which is selected to obtain a cleaned effluent gas discharge from which a predetermined percentage of SO2 has been removed and then desorbing the SO2 under vacuum conditions sufficient to desorb the required amount of SO2 while simultaneously cooling the water to a temperature which stabilizes the temperature of the water plus absorbed SO2 at said selected temperature.