关键词: 球团, 竖炉, 移动床, 填料床, 空隙率, 粉矿

Abstract: Based on the theory of gas/solid packed beds, the pelletizing shaft furnace (PSF) of Jinan Iron and Steel Co. Ltd was investigated for the formation, harm and control of the dust and particles (DP) in PSF. Some conclusions are therefore drawn as follows. The quantity of DP in PSF is equal to the difference of mass flux between dry pellets and finished pellets, and DP are formed mainly in three ways, i.e., cracking, free falling and collision. The deposits of cycling DP are difficult to remove out. From the drying zone to the soaking zone the formation rate of DP decreases gradually with the increasing DP accumulation, while the DP accumulation amount decreases abruptly at the bottom of internal vertical air channels (IVAC) because of the cycling of deposited DP. The increasing DP in PSF will result in reducing capacity utilization of PSF and increasing energy consumption for pelletizing process. The efficient way to control DP in PSF is collecting and sucking them out of PSF with gas flow through IVAC bottom by gravitational precipitation. Then, the clean gas flow returns PSF to intensify the drying of green pellets.