Abstract: Based on the porous media characteristics of cement clinker accumulation body in grate cooler, a seepage heat transfer model of grate cooler is established with the thermal non-equilibrium theory and the Forchheimer-Brinkman-Darcy extended model. The model is utilized to make the numerical simulation of the cooling process of cement clinker in grate cooler and then the temperature variation of air and clinker can be achieved in different wind speed and different grate speed. The results show that the established model can reflect the cooling process of cement clinker accumulation body more accurately. The increase of wind speed is conducive to the cooling of clinker, but it will lower the wind temperature of the recovery. The reasonable range of wind speed is 1.5-2.0 m/s. Secondly, the increase of grate speed can strengthen the front quenching in the case of a fixed yield, which is good to formatting high-quality clinker. But the gas temperature in the front of grate cooler will decrease if the grate speed is too fast. In this way, the sintering of cement clinker is not very well. In the case of a fixed bed depth, the increase of grate speed can improve the recovery wind temperature and the discharging temperature. The discharging temperature is on the high side when the grate speed is too high. By comprehensive consideration of the influence of grate speed on the cooling process under the fixed yield and the fixed bed depth, the reasonable range of grate speed is 0.006-0.008 m/s.

Key words: cement clinker, non-equilibrium, numerical simulation, porous media