COAL-FIRED BOILER EXHAUST GAS TREATMENT APPARATUS AND COAL-FIRED BOILER EXHAUST GAS TREATMENT METHOD

摘要

Provided is an exhaust gas treatment apparatus which includes a denitration device (2), a dust collector (4), and a desulfurization device (5) in order, respectively, in a flow path of exhaust gas discharged from a boiler (1), wherein a heavy-metal component removal device (10) is provided in the exhaust gas flow path between the dust collector (4) and the desulfurization device (5). This device (10) is provided with: an absorption tower (45) including a nozzle (47) which sprays acidic absorption liquid on the exhaust gas, a tank (49) which stores liquid which has absorbed a heavy metal, and a pump (50) which supplies the nozzle (47) with the liquid in the tank (49); a neutralizing tank (52) which neutralizes the liquid drawn from the absorption tower (45); and a separator (53) which separates the neutralized liquid into a solid component and a liquid component. Since a small amount of heavy metal can be removed in the absorption tower (45), re-discharging of the heavy metal by the desulfurization device (5) is prevented.