To improve the efficiency of the blast furnace, it is necessary to achieve a considerable decrease of coke and total energy consumption for primary metal production along with minimal environmental impacts. Injection of auxiliary fuels such as natural gas and pulverized coal can effectively contribute to the improvement of blast furnace in the last two decades. Natural gas (NG) co-injection with pulverized coal is an attractive technology to improve the efficiency of combustion in blast furnace.
In this project, Computational Fluid Dynamics (CFD) is applied to simulate the pulverized coal injection with natural gas co-injection inside the blow pipe and tuyere of a blast furnace. The effects of several factors are studied including the locations of natural gas injection, flow rates of natural gas, flow rate of coal, oxygen enrichment, and blast temperature.
The CFD simulation for the NG and coal co-injection in the tuyere of a blast furnace has been conducted. A system of parametric study is carried out for improving the efficiency of coal combustion and NG combustion in blast furnace. It is found that the coal devolatilization increase significantly by co-injection NG from lance, but limited in the case of NG injection from tuyere gas port.