低温等离子体预处理对马铃薯薄层热风干燥特性的影响

李帅; 赵岩岩; 曾英男; 谷雨

doi:10.13386/j.issn1002-0306.2021080161

低温等离子体预处理对马铃薯薄层热风干燥特性的影响

Effect of Low-temperature Plasma Pretreatment on Hot-air with Thin-layer Drying Characteristics of Potatos

摘要

摘要: 为实现马铃薯高效干燥，缩短干燥时间，提高干燥效率。本文以薄层热风干燥实验为基础，在马铃薯热风干燥前，采用低温等离子体对其预处理，研究马铃薯在不同等离子体预处理时间（20、30、40、50、60 s）、等离子体预处理功率（100、200、300、400、500 W）和干燥温度（50、70、90 ℃）条件下的干燥特性，并将其与未预处理马铃薯相比较。结果表明，等离子体预处理可有效提高马铃薯热风干燥速率，缩短干燥时间。水分有效扩散系数在3.785×10⁻¹¹~11.868×10⁻¹¹ m²/s之间。当等离子体处理功率为500 W，处理时间30 s，热风温度70 ℃时，干燥效果最佳，较对照组干燥时间缩短35.71%。本研究为马铃薯热风干燥预处理方法的研究提出了新思路，对等离子体技术在新领域的应用进行了探讨，同时为马铃薯高效干燥预处理技术的研究提供新的参考和理论依据。

Abstract: In order to achieve the efficient drying of potatoes, shorten the drying time and improve the drying efficiency. In this study, low-temperature plasma technology was used to pretreat potatos for hot-air with thin-layer drying experiment. Study on different plasma pretreatment time (20, 30, 40, 50, 60 s), plasma pretreatment power (100, 200, 300, 400, 500 W) and drying temperature (50, 70, 90 ℃) conditions of drying characteristics, and compared it with unpretreated potatoes. The research results showed that plasma pretreatment could effectively accelerate the drying rate and shorten the drying time.The effective moisture diffusivity was in the range of 3.785×10⁻¹¹~11.868×10⁻¹¹ m²/s. After pretreatment power of 500 W for 30 s at 70 ℃, drying time was shortened by a maximum of 35.71%, compared with the control group. This research put forward new ideas for the research of potato hot-air drying pretreatment methods, discussed the application of plasma technology in new fields, and provided new reference and theoretical basis for the research of potato high-efficiency drying pretreatment technology.