| 摘要 |
EXHAUST GAS PROCESSING SYSTEM AND PROCESSING METHOD There is disclosed an exhaust gas processing system, comprising: a desulfurization unit (2) that removes a sulfur oxide from an exhaust gas by a limestone/gypsum method; a denitration unit (3) arranged in a subsequent stage from the desulfurization unit (2) to remove a nitrogen oxide from the exhaust gas; a carbon dioxide recovery unit (4) arranged in a subsequent stage from the denitration unit (3) to recover carbon dioxide from the exhaust gas; and an oxygen supply unit that supplies a fraction of a post-recovery gas discharged from the carbon dioxide recovery unit (4), as an oxygen source, to the desulfurization unit (2), wherein the oxygen supply unit comprises: a monitor (79) having an analyzer (75) for monitoring the purity and the recovery ratio of the recovered carbon dioxide recovered by the carbon dioxide recovery unit (4); and an adjusting apparatus (73, 74) that adjusts the proportion of the fraction of the post-recovery gas to be supplied to the desulfurization unit (2) in the post-recovery gas discharged from the carbon dioxide recovery unit (4), based on the purity and the recovery ratio of the recovered carbon dioxide which are monitored by the monitor (79). |
