SPRAY-DRYING DEVICE FOR DEHYDRATED FILTRATE FROM DESULFURIZATION WASTEWATER, EXHAUST GAS TREATMENT SYSTEM AND METHOD

摘要

A spray-drying device includes a spray nozzle (52) that sprays the dehydrated filtrate (33) from the desulfurization wastewater, in a spray-drying device body (51), an inlet (51a) that is provided in the spray-drying device body (51) and introduces flue gas (18) for drying spray liquid (33a, a dry area (53) that is provided in the spray-drying device body (51) and dries the dehydrated filtrate (33) by the flue gas (18), an outlet (51b) that discharges the flue gas (18) contributing to the drying, a plurality of thermometers (T 1 to T 7 ) that are provided in the dry area and measure temperatures of the inside, a determination unit (54) that determines whether or not a spray-drying state of the dehydrated filtrate (33) is satisfactory on the basis of the measurement results of the thermometers, and a control unit (55) that adjusts the flue gas or the dehydrated filtrate when it is determined that the spray-drying is not satisfactory as a result of the determination of the determination unit (54).