| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce the amount of emergence of a chlorine bypass dust in order to raise chlorine removal efficiency in chlorine bypass equipment, and to stabilize the contents of chlorine and calcium of a chlorine bypass dust in order to prevent destabilization, etc., of a cement quality when the chlorine bypass dust is added to cement. <P>SOLUTION: In a treating method for a cement kiln extraction gas, when cooling and simultaneously extracting a part G of a combustion gas from a kiln exhaust gas channel continued from a kiln inlet of a cement kiln 2 to a lowest step cyclone, separating a coarse powder D1 from an extraction gas G1, and collecting a fine powder from an extraction gas G2 containing a fine powder D2, the concentration of dust (D1+D2) accompanied to the extraction gas G1 or the classification point of a cyclone (classifier) 4 for isolating the coarse powder D1 from the extraction gas G1 is adjusted, in order to restrict the chlorine concentration of the fine powder D2 to 10 mass% or higher and the CaO concentration of the fine powder D2 to 35 mass% or lower. <P>COPYRIGHT: (C)2012,JPO&INPIT |
