GAS-solid convection heat transfer of particle from moving-bed during heat recovery from centrifugal granulation of furnace slag

In this paper, the gas-solid heat transfer characteristics of high-temperature slag particle in the moving-bed were studied. The cooling behavior of slag particle in the gas-solid heat transfer process in the moving bed was investigated. The key factor, such as the influence of initial temperature of the particle and airflow rate on the temperature distribution and gas-solid convection in the bed was obtained. When the particle inlet temperature raised from 166 °C to 335 °C, the average cooling rate of the particle increases from 0.6 °C·s^-1 to 1.4 °C·s^-1.When the air inlet velocity increased from 0.4 m·s^-1 to 0.7 m·s^-1, the average temperature of the layer decreased from 190.8 °C to 147.4 °C, and the average convective heat transfer coefficient of the layer increased from 40.46 W·m^-2·K^-1 to 70.81 W·m^-2·K^-1. The increasing of the inlet air velocity did not significantly enhance the heat transfer, but greatly increased the system energy consumption.