摘要

Heat transfer between a clinker layer and cooling air was studied by using the mechanics of the flow in porous media. Considering local thermal nonequilibrium and thermal dispersion effect, a seepage heat transfer model for compressible fluid flowing through a porous clinker layer was constructed with variable properties of a grate cooler. A solution algorithm for thermally coupled seepage was proposed. The effects of main working parameters, wind pressure, and grate speed on the clinker cooling process were shown. The simulation results showed that there was a large deviation between the variable properties model and constant properties model. The variable properties model can make a more accurate description for the temperature distribution of the clinker layer. With increase in wind pressure, the air temperature and clinker temperature drop while the seepage velocity increases. When raising the grate speed at an invariant feed rate, the seepage velocity increases, the air temperature inside the clinker layer and the clinker temperature at the top of the front clinker layer drop, while the clinker temperature in other regions increases. When raising the grate speed at a certain thickness of the clinker layer, the low velocity area increases while the air temperature and clinker temperature in the clinker layer increase.