Simulation Study on Performance of Novel Oxygen-coal Lances for Pulverized Coal Combustion in Blast Furnace Tuyere

AbstractPulverized coal injection (PCI) into blast furnace tuyere using two novel oxygen-coal lances has been designed by MCC Company. In this paper, a three-dimensional multi-phase model with Discrete Particle Model (DPM) approach has been developed to examine the performance of the novel oxygen-coal lance for PCI operation. Simulation conditions and properties of the PCI were obtained from the real operation conditions of the blast furnace of 580 m3 with molten iron output of 1775 t/d in the industrial experimental base of MCC Incorporation. The simulation results of novel PCI style were also compared with the results of traditional one. Results show PCI using sing coal lance and single oxygen lance pattern is inferior to the conventional PCI mode. Its disadvantages include low BR increase, poor oxygen utilization level and potential damages to the tuyere. PCI using twin oxygen-coal lances is superior to the conventional PCI pattern. Its advantages include doubled burnout ratio, satisfying oxygen consumption level in the raceway and high temperature zone in a safe distance from the nozzle