Study On The Numerical Simulation Of The Combustion Process In A Top Combustion Hot Stove

Hot blast stove is an important auxiliary equipment in blast furnace ironmaking.The top combustion hot blast stove is widely used in blast furnace ironmakingindustry because of its large heat storage area, high thermal efficiency, high airsupply temperature, and long life and so on. It is of great significance to study thedistribution of internal flow and temperature field of the top combustion hot blaststove. to optimize its structure and improve its thermal efficiencyIn this paper, a mathematical and physical model of gas flow, combustion andheat transfer is established in a top combustion hot stove from a national company.With non-premixed combustion technique, the combustion process in presentoperating condition is simulated and the gas low, turbulent kinetic energy, shearstress distribution, concentration field and temperature distribution in the stove areanalyzed. The influences of the excess air coefficient on gas flow, temperaturedistribution, concentration field and flame length are discussed. The results showthat:(1) The air flows in a clockwise vortex state in the hot blast stove. The turbulentkinetic energy and the shear stress is big in the location with higher flow velocity.The excess air coefficient is relatively small, thus the gas combustion is notsufficient which leads to more remained CO, and thus the temperature at the checkerbricks exit is lower. Furthermore, the flame length in this case is pretty long whichwould reduce the service life of checker bricks.(2) With properly increased excess air coefficient, i. e., with increased mass flow rateof air, the CO mass fraction at the chamber outlet is decreased obviously, the flamelength is shorten significantly and a higher outlet temperature can be obtained.