| 摘要 |
<p>PROBLEM TO BE SOLVED: To enable the stable operation of a kiln possible by rapidly cooling the waste gases at the tail at the kiln, thereby eliminating coating troubles and suppressing the reformation of dioxin and to stable produce cement and cement based solidifying material by efficiency treating waste gas dust and effectively utilizing this gas in the production of the cement and cement based solidifying material by firing the chlorine-contg. raw materials, such as incineration ashes of municipal waste, in the kiln. SOLUTION: The waste gases at the kiln end are cooled with air or water to lower the waste gas temp. down to <=400 deg.C, more preferably <=300 deg.C. Further, calcium carbonate, dolomite, quicklime or slaked lime, etc., are blown to the waste gases to rapidly cool the gases. The apparatus for production is illustrated in the Fig. The compounded raw materials contg. cement raw materials, etc., are molded to about 5 to 50mm and the moldings are supplied, after drying, into the kiln 1 from a housing 3. The moldings are cooled in a clinker cooler 6 after firing. The waste gases are introduced to a waste gas duct 3, a classifying means 4, a dust collector 5 and a fan device 7. A rapid cooling means 8 is disposed in the lower part 3b of a discharge duct 3.</p> |
