Abstract:
To increase the sinter output, reduce the return fine rate and the solid fuel consumption in the sintering process, measures such as adjusting the flux type, optimizing the fuel structure and carrying out equipment transformation were proposed for the 360 m
2 sintering machine of Tiantie Group. In terms of flux, a high-activity flux with a CaO content of more than 90% was selected. For fuel, the ratio of pulverized coal to coke breeze was adjusted to 1∶2 through sintering pot tests and thermogravimetric analysis, and the proportion of fuel with a particle size of less than 1 mm was strictly controlled. In respect of the process flow and equipment transformation, methods including adding countercurrent liners to strengthen granulation, improving waste heat utilization efficiency to raise the mixture temperature, and modifying the sinter conveying mode were adopted. The above measures effectively intensified the sintering process, increasing the average particle size of the mixture to 4.94 mm and raising the mixture temperature from 70 ℃ to 85~90 ℃. The sinter return fine rate decreased from 16% to 12%, the solid fuel consumption reduced from 45.04 kg·t
-1to 44.25 kg·t
-1, and the daily sinter output increased from 13 000 t to 15 000 t, thus successfully achieving the goals of increasing production and reducing consumption.