Abstract Periodic operation has emerged to increase process performance focused on imposing a transient operating regime, however, it has not been employed in industrial grain hydration yet. Thus, periodic operation for wheat grains hydration process with temperature oscillation as a single manipulated variable was investigated. Periodic hydration experiments were performed considering the temperatures of isothermal hydration, with 10 °C and 20 °C amplitude. In order to compare the performance of periodic with isothermal operation, hydration experiments were carried out at three mean temperatures: 22 °C, 30 °C and 40 °C. Kinetic models were studied, among them the generalized diffusion model presented the best fit with a maximum deviation of 7%. The hydration at 30 °C and 40 °C with 20 °C amplitude intensified the process, with increase in rate mass transfer leading to a 40% reduction in process time. This study proves that periodic operation with temperature oscillation is a highly promising strategy for hydration process intensification.

中文翻译：

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通过定期操作强化小麦水化过程

摘要 周期性操作已经出现以提高过程性能，重点是施加瞬态操作制度，但是，它尚未用于工业粮食水化。因此，研究了以温度振荡作为单一操纵变量的小麦籽粒水化过程的周期性运行。考虑到等温水化的温度，以 10 °C 和 20 °C 的幅度进行定期水化实验。为了比较周期性和等温操作的性能，在三个平均温度下进行水化实验：22°C、30°C和40°C。对动力学模型进行了研究，其中广义扩散模型拟合效果最好，最大偏差为 7%。在 30 °C 和 40 °C 下以 20 °C 的幅度进行水合会加剧该过程，随着传质速率的增加，工艺时间减少了 40%。该研究证明，具有温度波动的周期性操作是水化过程强化的一种非常有前景的策略。