数字农科院2.0

Thermodynamics and non-uniformity in convective reversing drying wheat

文献类型： 外文期刊

作者： Jianchun Yan;Hai Wei;Huichang Wu;Zhaoyan You;Huanxiong Xie

作者机构：

关键词： Airflow reversal;Energy;Exergy;Fixed-bed drying;Wheat

期刊名称： Applied Thermal Engineering

ISSN： 1359-4311

年卷期： 2023 年 231 卷

页码：

收录情况： SCIE（2023版） ; ; EI（2023版）

摘要： To address the gaps in the study of periodic airflow reversal and its influence on the thermodynamic behaviour of fixed-bed drying, several wheat drying experiments were conducted at varying air temperatures, velocities, and reversing times. This study investigated the distributions of energy and exergy consumed, energy utilisation ratio, energy efficiency, exergy efficiency, and drying non-uniformity happened inside the drying chamber. The consumed energy was distributed among wheat temperature increase (9.77%), water evaporation (32.29%), loss by wall (0.87%), and air outflow (57.07%); the consumed exergy was distributed among air outflow (37.74%), wheat temperature increase (7.53%), loss by wall (0.27%), water evaporation (43.81%), and destruction by irreversible processes (10.65%). These observations suggest that higher air temperatures led to higher energy utilisation ratios, energy efficiencies, exergy efficiencies, and drying non-uniformities. Furthermore, higher air velocities resulted in lower energy utilisation ratios, energy efficiencies, exergy efficiencies, and drying non-uniformities. Airflow reversal can effectively diminish moisture non-uniformity after drying. However, excessively frequent reversals result in energy emissions that do not benefit for the reduction in moisture non-uniformities. Instead, it leads to lower energy-utilisation ratios, and energy and exergy efficiencies. The results of this study provide important insights for balancing thermodynamic behaviour and non-uniformity in actual applications.

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