Three dimensional simulation of the pulverized coal combustion inside tuyere of the blast furnace in Isfahan Steel

In the present study, a steady state three dimensional simulation of the pulverized coal combustion inside tuyere of blast furnace in Isfahan Steel has been investigated and the effect of the blast air parameters such as oxygen percent in blast air and blast air temperature at the outlet of the tuyere has been investigated. The use of auxiliary fuels in the blast furnace is used to increase productivity, reduce production costs and increase efficiency in most parts of the world in the steel industry. In the first case, the simulation is carried out without the pulverized coal and only natural gas was considered. In the second case, gas removed from geometry and the combustion behavior of pulverized coal is simulated. The combustion model used for these cases is non-premixed combustion. In the third case, combustion behavior of the combination of natural gas and pulverized coal in the blast furnace tuyere is simulated by using the eddy dissipation model. The results show that increasing the oxygen content and the blast air temperature cause to increase the maximum temperature and maximum velocity at outlet. The standard k-ε model is used for turbulence and the DO radiation model solves the radiative transfer equation.