SEAWATER FLUE-GAS DESULFURIZATION DEVICE AND METHOD FOR OPERATING SAME

摘要

A seawater flue-gas desulfurization device provided with an absorption tower (1) and an oxidation tank (14). Said absorption tower (1) is provided with the following: dust-removal spray nozzles (8) that repeatedly supply seawater from a circulation tank (5) so as to absorb or catalytically remove soot and heavy metals from an exhaust gas; desulfurization spray nozzles (9), above the dust-removal spray nozzles (8), that spray fresh seawater so as to absorb and thereby remove SOx from the exhaust gas; and two or more collectors (10), laid out in a staggered pattern between the nozzles (8 and 9), that collect all of the seawater sprayed by the desulfurization spray nozzles (9). All of the seawater sprayed by the desulfurization spray nozzles (9) is collected by the collectors (10) and oxidized in the abovementioned oxidation tank (14). In this seawater flue-gas desulfurization device, a flow-control member (22) that controls the flow of the sprayed seawater is laid out between the collectors (10) and the desulfurization spray nozzles (9) and a mist eliminator (23) is laid out between the collectors (10) and the dust-removal spray nozzles (8) so as to prevent any liquid from passing between an absorption section (A) of the absorption tower (1), which contains the desulfurization spray nozzles (9) and removes SOx from the exhaust gas, and a dust-removal section (B) of the absorption tower (1), which contains the dust-removal spray nozzles (8) and removes soot and heavy metals from the exhaust gas. The treatment load associated with purifying contaminated seawater in the dust-removal section (B) is thus reduced.