EXHAUST GAS TREATING METHOD AND TREATING SYSTEM FOR CEMENT BURNING PLANT

摘要

An exhaust gas treating method and treating system for cement burning plant that realize construction of equipment from general-purpose devices, enhancement of handleability of recovered micropowder dust and accordingly run of maintenance-free stable operation. In the extracting of portion of exhaust gas at rear end area (2) of cement kiln (1) or a lowermost area of preheater (3) as an extraction gas, the temperature of the extraction gas is held within the range of 950° to 1150°C by not only dispersing of cement raw materials but also regulating the amount of dispersion. The extraction gas is cooled to the melting point of chlorocompound or below, and thereafter the classification particle size in solid/gas separating means (12) is regulated within the range of 12 to 30 µm. Dust over the classification particle size is separated, and micropowder dust not greater than the classification particle size is trapped/removed from the extraction gas by dust trapping means (13). Accordingly, the chlorine concentration of trapped micropowder dust falls within the range of 5 to 20%.