APPARATUS FOR TREATING EXHAUST GAS

摘要

PURPOSE:To recover a byproduct with low water content while dispensing with waste water treating equipment, by providing a spray dryer, a dust collector and an absorbing tower in series. CONSTITUTION:Exhaust gas after passing a gas/gas heater 1 is guided to a spray dryer 2 and cooled while contacted with liquid containing Na2SO3 sent from an absorbent concn. regulating tank 4 through a conduit 9. Na2SO3 is brought to a solid component by water evaporation and taken out of a byproduct take-out pipe 10. The cooled exhaust gas is passed through a dust collector 3 to further collect the solid component and thereafter guided to an absorbing tower 4. An absorbing liquid of which the concn. is regulated in the absorbent concn. regulating tank 7 provided with an absorbent supply pipe 11 of NaOH and a replenishing water supply pipe 12 is supplied to the adsorbing tower 4 through the conduit 9 and a branched pipe 13 to absorb and remove SO2 in the exhaust gas while the purified exhaust gas is exhausted through a gas heater 1. The recirculated absorbing liquid of the absorbing tower 4 is sent to the regulating tank 7 and sent to the spray dryer 2 from the conduit 9 to be taken out as the solid component from a byproduct take-out pipeline 10.