为了探索疏浚底泥有效干燥处理的新途径, 对疏浚底泥进行微波干燥试验, 探讨了不同底泥厚度和微波功率 对疏浚底泥微波干燥特性的影响, 分析了微波干燥过程中单位能量消耗, 并引入薄层干燥模型对底泥干燥过程进行 模拟。结果表明, 随着底泥厚度的依次增加, 干基含水率下降速率逐渐降低, 干燥所需时间逐渐延长; 微波功率越 大, 干燥时间明显缩短; 10 mm 厚底泥最大干燥速率约是 40 mm 的 3 1 0 倍。单位耗能分析表明, 不同厚度底泥在 280 W 下单位耗能较低, 能量利用更加充分。通过分析试验数据, 确定了疏浚底泥微波干燥过程中水分比变化适用 M odified Page 2I 模型, 且模型拟合较好, 可用于预测不同厚度疏浚底泥微波干燥至不同含水率所需干燥时间。

In this paper, microwave drying of dredged sediment was carried out using domestic microwave oven in order to ex2 plore a new way of effective dry processing for dredge sediment. Effects of different sediment thicknesses and microwave power outputs on the drying characteristics of dredged sediment by microwave energy were discussed and the unit energy consumption was analyzed, and thin layer drying modelwas introduced to simulate the drying process. The results showed that the decreasing rate of dry basis moisture content reduced and the drying time extended with the increasing of sediment thickness successively the drying time shortened significantly with the increasing of the powers; and the maximum drying rate of 10 mm thick sediment was about 3. 0 times of that of 40 mm thick sediment. T he unit energy consumption analysis showed that the unit energy con2 sumption was lower under 280 W for different thicknesses of sediment, and energy utilization was more effective. Modified Page 2 I model was determined to be applicable to analyze the microwave drying of sediment through the analysis of experimental data, and the model had good fittings. Therefore, the model can be used to predict the drying time for different thicknesses of dredged sediment with different moisture contents.