| abstract |
(57) [Abstract] [Purpose] Equipped with a compact absorption tower that can perform desulfurization and dust removal economically and efficiently even when the SOx concentration in the exhaust gas is high or when a high dust removal rate is required. To provide a flue gas desulfurization device. A spray stage 4a having a high spray droplet density is provided in a part of a plurality of spray stages 4 and the spray stage 4a is provided. It is possible to reduce the number of spray stages, that is, it is possible to reduce the tower height of the absorption tower 3, and to increase the probability of collision between the dust particles of the exhaust gas and the liquid droplets, since the amount of liquid supplied can be increased. It is possible to obtain a high dust removal rate. The spray stage 4a has the same spray nozzle size as the other spray stages 4, but the spray droplet density can be increased by making the spray nozzle density higher than that of the other spray stages or smaller than the spray nozzle size of the other spray stages 4. Increase. |