Question

How does raft affect throughput cost or quality of hot metal production in blast furnace?

Answer 1

The injection of oxygen to the air blast reduces the specific flow of the gas causing a reduction in the top temperature and an increase in the adiabatic temperature (RAFT) in the tuyeres. ... Thus a combined injection of oxygen and fuel at the tuyere level increases the productivity of the blast furnace.So, the main principle of the blast furnace is to take away the oxygen from iron oxides, producing pig iron as the main product. In the blast furnace enormous amount of heat is produced for the reduction of iron ore.