不同通风方式对就仓干燥效果的数值模拟研究OA

Current in-bin grain drying techniques still exhibit limitations in airflow distribution,drying rate,and energy consumption control.Investigating the feasibility of cross-flow ventilation in in-bin drying can provide a more efficient design pathway for process equipment in vertical silos.Based on porous media fluid dynamics and heat-mass transfer theory,this study optimized hopper-bottom vertical silos designed for vertical ventilation and cross-flow ventilation by reasonably adjusting airduct layouts.Numerical simulations were performed to compare the operational performance of the two drying systems,with particular focus on airflow distribution inside the silo,grain bulk temperature,grain bulk moisture content,drying rate,drying uniformity,and energy consumption and drying cost during the drying process.The results showed that the cross-flow ventilation system achieved an energy consumption of 2 328 kWh,reduced the drying cost to 21.4 CNY/t,and attained a specific moisture extraction rate(SMER)of 3.3 kg/kWh.Compared with the vertical ventilation system,the cross-flow ventilation process outperformed it in airflow distribution uniformity,drying rate,and energy consumption,and was therefore identified as the optimal drying process configuration.