Abstract:

Taking the sintering material in a single pallet of a 360{\mathrm{m}}^{\mathrm{2}} belt sintering machine in a steel plant as the research object， based on the porous media model and sintering theory， combined with local non‑equilibrium thermodynamic theory， component transport theory and the kinetic equation of various key sub‑models， a two‑dimensional transient mathematical model of mass and heat transfer in the sintering process of sintering material was established. The main factors and laws affecting the mass and heat transfer in the sintering process were simulated and studied， and the material bed temperature， the specific distribution of the main flue gas components in the material layer were obtained. The results show that， an increase in negative pressure of the exhaust caused a rise of overall temperature in the material layer， an increase in oxygen content and a decrease in carbon dioxide content in the material layer. The increase in thickness of the material layer leads to a rise of overall temperature， a decrease in oxygen content， and an increase in carbon dioxide content in the material layer. The appropriate exhaust negative pressure at the bottom of the trolley and material layer thickness are 12 kPa and 0.6 m， respectively. The temperature of the combustion zone is close to 1 500 K， and the volume fractions of oxygen and carbon dioxide in the combustion zone are about 11% and 10%， respectively.

Key words: sinter, porous media, sintering process, mass and heat transfer, numerical simulation