FLUE GAS DESULFURIZATION APPARATUS

摘要

PURPOSE:To provide a FLUE gas desulfurization apparatus which does not need a hydroextractor and a waste water treatment apparatus. CONSTITUTION:Most of a waste gas discharged out of a boiler 2 flows in an absorption tower 16 and calcium sulfite is produced. The calcium sulfite produced in the absorption tower 16 flows in an oxidation tower 20 and in the oxidation tower calcium sulfate is produced and gypsum water consisting of the calcium sulfate produced in the oxidation tower 20 and water is sprayed to the inside of a spray dryer 26 after passing a gypsum water supplying route 28. Meanwhile, a part of the waste gas discharged out of the boiler 2 flows in a waste gas by-pass flowing route 25 through a waste gas flowing route 3 or 8 and only the water in the gypsum water sprayed to the spray dryer 26 is evaporated by the heat of the waste gas in the spray dryer 26 and only the waste gas from which water of the gypsum water is evaporated joins with the waste gas going to flow in the absorption tower 16 in the waste gas flowing route 10.