| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To lower facilities cost to perform the desalination treatment of chlorine bypass dust and to utilize sulfur removed from a combustion gas extracted at the neighborhood of a cement kiln inlet hood. <P>SOLUTION: A part of the combustion gas is extracted at a kiln exhaust gas flow path which exists from a kiln bottom to a bottom cyclone in a cement kiln 2. A coarse dust powder in the extracted gas is separated and the extracted gas containing a particulate is introduced into desulfurization facilities 7, 13, 16 and 19 by an absorbing method using a magnesium hydroxide slurry. Sulfur dioxide in the combustion gas is desulfurized by the reaction with magnesium hydroxide and slaked lime and then gypsum can be recovered. A gypsum slurry containing salt water as it is can be supplied to a cement mill when its chlorine concentration is 200 ppm or less which exhibits a standard value. When it is more than 200 ppm, washing equipment to wash the excess dust is not necessary as only salt water which has excess chlorine can be separated and supplied to effluent treatment/desalination facilities. <P>COPYRIGHT: (C)2004,JPO</p> |
