Numerical Simulation Of Gas-Clinker Two-Phase Flow And Heat Transfer In The Grate Cooler

As the basic raw material of the construction industry,cement occupies the important position in the national economic production of our country.After the development of cement production technology,the new dry cement production process has become the mainstream cement production method in Chinese cement enterprises.As the important equipment,the grate cooler is responsible for the cooling ?transportation and heat recovery of the clinker in cement production line.However,because of the complexity of the system structure and the internal heat transfer of grate cooler,traditional experimental measure cannot obtain the temperature field of the clinker and air.Therefore,there is an increasingly important research focus on establishing the simulation model of the grate cooler and exploring the thermal process.Based on the grate cooler of some cement production line in the north of China,the article simulate the flow and heat transfer process between clinker and air by applying Euler multiphase flow model?standard k-? turbulence model and porous medium model of CFD software.Comparing the calculating results with the field monitoring date,it proved the correctness of the simulation.By this simulation,this paper studied and analyzed the distribution of velocity field?pressure field and temperature field within the grate cooler.The main thermal parameters' influence on the grate cooler internal heat transfer is analyzed,which include the average particle diameters,layer thickness of cement clinker,the wind rate of wind box,and the wind temperature of wind box.Temperature field distribution of cement clinker and air under different working conditions were obtained.On this basis,The method to improve the heat transfer of the grate cooler on the cement production line is put forward.The article studied and analyzed the flow and heat transfer of the clinker and air in the grate cooler,which is equipped the exhaust gas recirculation system,and the optimum air flow rate is figured out.Numerical results for the grate cooler provide a reliable theoretical basis for heat recovery engineering,and a reference for the operation of grate cooler.Based on the actual operating condition of the grate cooler,the energy balance model and exergy balance model are established on the foundation of the law of thermodynamics,the distribution of energy and exergy use and loss of are revealed.By the exergy balance model,the paper analyzed the exergy use and loss of the grate cooler equipped with the exhaust gas recirculation system.