Abstract
The extent of coal combustion within the tuyere and raceway region is one key factor affecting the maximum pulverized coal injection (PCI) rate. Coal burnout strongly depends on the availability of oxygen. In this paper, a three-dimensional model is developed to simulate the lance–blowpipe–tuyere-raceway of a blast furnace. This model aims to describe the coal flow and combustion behaviors along the coal plume under different local oxygen enrichment ways. Room-temperature oxygen has two effects on coal combustion. On one hand, the cooling effect of oxygen delays the coal combustion. On the other hand, the oxygen content around the coal particles significantly increases, benefiting coal combustion. Therefore, aiming at different local oxygen enrichment ways, three different lance configurations, including a single coaxial oxygen-coal lance, a double oxygen-coal lance, and an oxygen-coal double lance, are designed. Under the single coaxial oxygen-coal lance, the burnout has the maximum increase of 4.05%. Under the double oxygen-coal lance, the burnout has the maximum increase of 12.51%. Under the oxygen-coal double lance, the burnout has the maximum increase of 12.84%. Therefore, the effect of different local oxygen enrichment ways should not be neglected.
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