Abstract: Taking 360m² sintering machine with the annual output of 3900kt sinter in an iron and steel company as a research sample， a mathematical model of gas-solid heat transfer process in sinter vertical tank was established. The main factors affecting the gas-solid heat transfer process in vertical tank and their influence rules were studied through numerical simulation and the suitable operation parameters was determined. The results show that with the decrease of gas superficial velocity and the increase of air inlet temperature， the sinter outlet temperature gradually increases， as well as the outlet temperature of cooling air. The decrease of sinter particle diameter results in the decrease of sinter outlet temperature and the increase of air outlet temperature. The optimal operation parameters of vertical tank are as follows: the air inlet flow under the standard condition is 455000m³/h， the particle equivalent diameter is 0.025m and the air inlet temperature is 130℃.

Key words: sinter, vertical tank, porous media, numerical simulation, optimization