| 摘要 |
PROBLEM TO BE SOLVED: To provide a mercury removal method with which a recovery rate of mercury can be maintained at a high level by maintaining high collection rate of a bag filter and, at the same time, a rise of mercury concentration due to release of mercury from mercury adsorption particles collected by the bag filter can be suppressed.SOLUTION: In a mercury removal method using a bag filter 5, mercury adsorption particles onto which mercury contained in exhaust gas is adsorbed are collected by a bag filter 5 arranged on the way of an exhaust gas flow, backwashing is performed to the bag filter 5, the mercury adsorption particles collected by the bag filter 5 are blown off and, thereby, mercury in the exhaust gas is removed. Therein, when a mercury concentration on the downstream side in an exhaust gas flow direction of the bag filter 5 exceeds a prescribed value when low-speed backwashing is performed to the bag filter 5 at a prescribed low cycle time, high-speed backwashing is performed to the bag filter 5 at a high cycle time shorter than the low cycle time. |
