In recent years,China economy develops fastly,which is based on the power of coal.The residue of coal combustion is call flyash.The quantity of flyash increses sharply.Flyash can be used as a source after some treatment.Removing C from flyash has becoming a hot research topic.The method of tribo-electrostatic separation has developed a lot.Triboelectrostatic Separator is a wonderful machine.In this paper,the research in mainly about particles motion in triboelectrostatic separator based on Computational Fluid Dynamics(CFD).It combined CFD and expremental test to study the best separating condition.This paper summarized the development of flyash treatment and the development of CFD including turbulence model and discrete phase models,also summarized the application of CFD in recent years.The computational theory was organized.The main forces on particle were gravity,drag force of airflow and electric field force through theorical analysis.Through the experimental tests,the factors of flyash separation was feeding speed,feeding airflow speed,assistant airflow speed,friction wheel reveloving speed and voltage of the electrode plate.And the optimal condition were 1.70m/s of feeding speed,1m/s of feeding airflow speed,0.1m/s of assistant airflow speed,1815r/min of friction wheel reveloving speed and 26 k V of the electrode plate.The lowest loss on ignition(LOI)is 5.58%.Simulation used turbulence model,discrete phase model(DPM)and magnetohydrodynamics model(MHD).Based on the optimal condition,simulation used the optimum parameters as the boundary condition.Through the simulation,airflow field in triboelectrostatic separator was analyzed.The increase of feeding airflow speed will increases the speed of air in the friction chamber and turbulence intensity;when feeding airflow speed was set,the increase of friction wheel reveloving speed would cause the increase of air field speed and speed gradient;assistant airflow speed had an effect on the air field in separating chamber.When the boundary condition’s parameters were 1.70m/s of feeding speed,1m/s of feeding airflow speed,0.1m/s of assistant airflow speed,1815r/min of friction wheel reveloving speed,the movement of single-particle from different feeding position and particles group were analyzed.The results of mumerical simulation would explain the phenomenon of detention of flyash in friction chamber and the yield change in products.Based on the comparision of experiments’ results and simulation results,the accuracy of simulation was tested,and it showed that numerical simulation had a reasonable accuracy. |