NUMERICAL ANALYSIS OF FLOW BEHAVIOR IN TUYERE AND RACEWAY OF OXYGEN BLAST FURNACE UNDER DOUBLE OXY-COAL LANCES OPERATION

摘要

The injection of pulverized coal together with CO_2-stripped blast furnace gas (BFG) into the raceway of oxygen blast furnace is capable of significantly reducing energy consumption and CO_2 emission. To a better understanding of the complicated phenomena in the tuyere and raceway region, especially the velocity field distribution, in this paper, a three-dimensional CFD model was proposed. In this model, both qualitative and quantitative analysis were conducted to investigate the effect of various operating parameters regarding the relative position as well as the angle between the blowpipe and oxy-coal lances on the simulation result so as to determine the optimum arrangement parameters for blowpipe and oxy-coal lances. In sum, this study is expected to be useful for optimizing the pulverized coal injection (PCI) operation in oxygen blast furnace.