Simulation Optimization And Experimental Verification Of Airflow Of Feed Belt Dryer Based On CFD

Among other dryers,belt dryer is widely used in feed drying due to its simple design and high efficiency.Extruded feed is not uniformly dried through the drying process when drying rate over 6 tons/h is required for industrial demand.Moisture non-uniformity of feed affects the drying efficiency,resulting in the high energy consuming of dryer.Moisture uniformity is good for storage and may increase production cost.The key to solve the problem of moisture uniformity is to make the airflow in dryer uniform.In this thesis,the design process of dryer and manufactured was introduced first,including the type selection of heater and exhaust fan,the design of belt conveyor.The effects of input parameters(feed thickness,exhaust fan frequency,side duct size,two kinds of dryer design)to the airflow distribution were investigated.The research focused on the effects of feed layer thickness parameters(20mm,30mm,40mm),exhaust fan frequency parameters(25Hz,30Hz,35Hz)and side air-duct size(0.5m,0.6m,0.7m)on the airflow velocity distribution on the feed layer surface in the double-layer feed belt dryer.Based on Computational Fluid Dynamics(CFD),the simulation of the internal airflow field of the dryer under the same conditions as the experiment was carried out.The calculation results were obtained by taking the points on the eloud map and vector diagram of the airflow velocity field.The experiment was conducted to verify experimental results by the belt dryer in the National Feed Processing Equipment Engineering Technology Research Center.The experimental results were compared with the simulation results.The results showed that the internal airflow velocity field distribution of the dryer is relatively uniform when the feed thickness is 40mm,frequency of the circulating fan is 40 Hz and lateral air-duct size is 0.6 m.This study provides a theoretical basis for designing a large belt dryer.This study provides a theory for designing belt-feed dryer while considering internal airflow distribution on the surface feed using CFD.The airflow velocity distribution on the feed surface was obtained,and more uniform airflow velocity distribution is selected for developing next generation dryers.