Abstract
Based on the operation conditions of the iron making blast furnace of 580 m3 in the industrial base of MCC Company, a three-dimensional mathematical model for analyzing combustion behavior of gas, pulverized coal and coke bed in the tuyere-raceway-dripping zone of blast furnace has been developed in the present research. The gas was modeled with steady-state turbulent Navier-Stokes equations; the pulverized coal particles were modeled by using a DPM (discrete particle model) approach and coke bed was treated simply as porous media. Two cases, the normal PCI case and the intensified PCI case, were then analyzed and compared. The simulation results indicate that, compared to the normal PCI case, the intensified PCI case has the advantage of an increase of 0.1 volume fraction of CO in the gas and moreover some 60 kg-coke/tHM could be saved. The negative effects of the proposed intensified PCI mode mainly include the drop of combustion temperature and the shrinkage of raceway.
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