Beijing Municipality Key Lab of Heating, Gas Supply, Ventilation and Air Conditioning Engineering, Beijing University of Civil Engineering and Architecture, Beijing, People's Republic of China.
Collaborative Innovation Center of Energy Conservation & Emission Reduction and Sustainable Urban-Rural Development in Beijing, Beijing University of Civil Engineering and Architecture, Beijing, People's Republic of China.
Environ Technol. 2024 Dec;45(28):6237-6248. doi: 10.1080/09593330.2024.2330474. Epub 2024 Mar 25.
Heat pump drying is a low-carbon method of sludge drying. The operating temperature of a heat pump is generally not more than 70℃. To improve the drying efficiency of heat pump dryers, the effects of air parameters and additives on sludge drying characteristics at low temperatures were studied. The sludge drying experiments were conducted at an air temperature 50-70℃ and an air velocity of 0.5-1.7 m/s. The experimental results showed that the increase of air temperature, velocity and the addition ratio of additives can accelerate the sludge drying process. The average and maximum drying rates of sludge pre-conditioned by CaO and sawdust increased by 14.23% and 25.71%, respectively, compared with those of pure sludge. The two-way analysis of variance (ANOVA) revealed that the influence of air temperature on the sludge drying was higher than that of air velocity. Five reference models were fitted by the drying experiment data. The Page model has the highest R, so it is the most suitable model to predict the drying time of sludge at low temperatures.
热泵干燥是一种低碳的污泥干燥方法。热泵的运行温度一般不超过 70℃。为了提高热泵干燥器的干燥效率，研究了空气参数和添加剂对低温下污泥干燥特性的影响。在空气温度为 50-70℃和空气速度为 0.5-1.7 m/s 的条件下进行了污泥干燥实验。实验结果表明，空气温度、速度和添加剂添加比例的增加可以加速污泥干燥过程。与纯污泥相比，用 CaO 和木屑预处理的污泥的平均和最大干燥速率分别提高了 14.23%和 25.71%。双向方差分析（ANOVA）表明，空气温度对污泥干燥的影响高于空气速度。通过干燥实验数据拟合了五个参考模型。Page 模型的 R 值最高，因此是预测低温下污泥干燥时间最适用的模型。
