| 摘要 |
PROBLEM TO BE SOLVED: To recover a demineralized cake containing less impurities with operation and equipment costs suppressed low and utilize chlorine bypass dust while expanding its applications.SOLUTION: A chlorine bypass system 1 comprises: a probe 3 extracting a part G of flue gas, while cooling, from a kiln exhaust gas flow passage extending from the kiln tail portion of a cement kiln 2 to the lowermost cyclone; a desulfurizer 10 wet-desulfurizing the extracted gas G1 from the probe; and a wet classifier 11 classifying slurry S2 discharged from the desulfurizer. Classification of the slurry discharged from the desulfurizer by the wet classifier provides a gypsum (dihydrate gypsum) slurry of a high purity, and the gypsum slurry is available in various applications, e.g. addition to cement. The classification point of the wet classifier can be 5-15 μm. Solid-liquid separators 12 and 13 for independent solid-liquid separation of slurries S3 and S4 can be provided. |
