Design of an experimental device to simulate coal injection in blast furnaces

An experimental device was designed to simulate coal injection in blast furnaces. The device meets the need of coal injection with high temperature and high speed by hot air, and it can be used to simulate coal injection in a nitrogen-free blast furnace. Numerical simulation of the flow field in the device at the injection moment was performed. The results show that when the velocity of injected air reaches the maximum, the average velocity of air in the blow pipe is 162.35 m·s^-1. The combustion regularity of pulverized coal was investigated using the device. The results show that the burning rate of coal increases with an increase in O/C atomic ratio. In the low O/C atomic ratio range, the burning rate of coal is comparatively low, but it increases more rapidly compared to that in the high O/C atomic ratio range. The burning rate of anthracite is lower than that of bituminous coal.