Abstract: Gas-solid heat transfer process in sinter bed layer is one key factor deciding whether waste heat recovery with vertical tank is feasible. Using Comsol Multiphysics software, the heat exchange in vertical tank was calculated on the basis of the steady heat transfer condition. The results showed that the ratio of gas to sinter and the depth of bed layer are the main factors affecting the heat exchange in vertical tank. The outlet temperature of the sinter and cooling gas is reduced gradually with increase of the ratio of gas to sinter. The value of exergy carried by the cooling gas increases firstly and then decreases with increase of the ratio of gas to sinter. The outlet temperature of cooling gas increases gradually and the ratio of gas to sinter increases with the increase of depth of bed layer. The value of exergy carried by the cooling gas increases firstly and then decreases with increase of depth of bed layer. When matching a single vertical tank for a 360 m² sintering machine, the appropriate height is 6~7 m and the ratio of gas to sinter should be in the range of 1500~1650 m³/t. When matching two vertical tank for the 360 m² sintering machine, the appropriate height is 5~6 m and the ratio of gas to sinter should be in the range of 1360~1550 m³/t.