| abstract |
Provided is an exhaust gas processing system which has excellent durability, allows reducing processing costs, has good desulfurization and denitration efficiency, and can efficiently recover carbon dioxide with high purity. This exhaust gas processing system has: a desulfurization unit which removes sulfur oxides from the exhaust gas by the limestone-gypsum method, a denitration unit which is arranged downstream of the desulfurization unit and removes nitrogen oxides from the exhaust gas; a carbon dioxide recovery unit which is arranged downstream of the denitration unit and recovers carbon dioxide from the exhaust gas; and an oxygen supply unit which supplies the desulfurization unit with part of the recovered gas discharged from the carbon dioxide recovery unit as the oxygen source. An analysis device is used to monitor the purity and recovery rate of the carbon dioxide recovered by the carbon dioxide recovery unit, and on the basis of said purity and recovery rate, the ratio of recovered gas supplied to the desulfurization unit is adjusted. |