基于温度和功率控制的微波干燥研究

Study on microwave drying based on temperature and power control

基于一种可自动连续调节微波功率和自动控温的微波干燥系统,以土豆片为原料,采用3种不同温度和功率控制组合的干燥模型。对3种干燥模型的产品进行品质分析和能耗计算以寻求优良的土豆片微波干燥工艺。研究表明,无温度控制的微波干燥在干燥后期易发生过热现象使产品焦糊,基于预定功率分布的可变微波功率与反馈温度控制相结合,可以得到最佳的温度控制效果和产品质量;同时,干燥系统采取可变微波功率的控温方案比固定微波功率的控温方案要节约35%的能耗。

Based on a microwave drying system, automatically and continuously regulating microwave power and temperature control, a drying model composed of three different temperature and power controls was used to investigate the potato chips. After analyzing the drying quality and energy consumption of the three drying models, a good microwave drying process for potato chips was found. The re- search showed that the microwave drying without temperature control was easy to overheat in the last drying stage and made the product burnt. However, the optimal temperature control effect and product quality could be obtained by combining the variable microwave power with the feedback temperature control based on the scheduled power distribution. Moreover, in the microwave drying process, taking the temperature control scheme of variable power could save about 35% energy consumption than fixed microwave power.