Abstract：
This study provides a comprehensive analysis of the vacuum drying process for sludge drying, with a focus on optimizing energy efficiency and emission control. The study used both lab-scale static and pilot-scale vacuum drying systems to test various parameters like vacuum levels, heat source temperatures, and sludge thicknesses. The results indicated that optimal drying conditions were achieved at a vacuum level of -0.06 MPa, a heat temperature of 140 °C, and a sludge thickness of 3.4 mm, where the drying rate reaches 0.13278 g·g-1·min-1. The study underscores the significant influence of vacuum level, temperature, and sludge thickness on drying rates. The Page model was used to analyze drying kinetics, elucidating how changes in these parameters affect drying characteristics. Furthermore, the study also examined the pollutant emissions and energy efficiency at the pilot scale. It found that high vacuum environments could efficiently dry sludge using low-temperature heat source, leading to average energy consumption per unit evaporation of 3020.29 kJ/kg, which is lower compared to traditional methods. By harnessing low-grade industrial waste heat, this can be further reduced to 875.76 kJ/kg. This study offers valuable insights for sustainable sludge management systems, highlighting the environmental and economic benefits of vacuum drying technology. The detailed experimental approach and thorough analysis make a significant contribution to the field of the sludge drying.
摘要：
本研究全面分析了真空干燥工艺对污泥干燥,重点是优化能源效率和排放控制。该研究使用了实验室规模的静态和中试规模的真空干燥系统来测试各种参数，例如真空度，热源温度,和污泥厚度。结果表明，在-0.06MPa的真空度下实现了最佳的干燥条件，加热温度为140°C，污泥厚度为3.4毫米，其中干燥速率达到0.13278g·g-1·min-1。这项研究强调了真空水平的显著影响，温度,和污泥厚度对干燥速率的影响。Page模型用于分析干燥动力学，阐明这些参数的变化如何影响干燥特性。此外，该研究还以试点规模检查了污染物排放和能源效率。研究发现，高真空环境可以利用低温热源有效地干燥污泥，导致单位蒸发平均能耗为3020.29kJ/kg，与传统方法相比更低。通过利用低品位工业余热，这可以进一步降低到875.76kJ/kg。这项研究为可持续污泥管理系统提供了有价值的见解，突出了真空干燥技术的环境和经济效益。详细的实验方法和透彻的分析为污泥干燥领域做出了重大贡献。
