|
| 市政污泥干燥特性的实验研究和模拟分析 |
| Experimental study and simulation analysis on drying characteristics of municipal sludge |
| 投稿时间：2019-05-13 |
| DOI：10.13259/j.cnki.eri.2021.01.002 |
| 中文关键词: 市政污泥 干燥 模拟 有效扩散系数 活化能 |
| 英文关键词:municipal sludge drying simulation effective diffusion coefficient activation energy |
| 基金项目:上海理工大学科技发展项目（2019KJFZ201） |
|
| 摘要点击次数: 2506 |
| 全文下载次数: 2297 |
| 中文摘要: |
| 采用薄层干燥的方式对嘉兴市某污水处理厂的脱水市政污泥在不同厚度和温度下的干燥特性进行实验研究，并通过引入薄层干燥模型，对薄层市政污泥干燥过程进行模拟分析。结果表明：厚度越小或干燥温度越高，污泥干燥速率越快。当温度从70 ℃上升到130 ℃时，最大干燥速率从0.025 87 g·（g·min）-1上升到0.081 58 g·（g·min）-1；从节能角度考虑，温度过高会导致有更多的能量消耗在污泥干质上，不利于能量的有效利用；Midilli模型很好地描述了市政污泥含水率的变化与时间的关系；应用Fick扩散定律推导出70～130 ℃下薄层市政污泥干燥的水分有效扩散系数变化范围为5.96×10-9～3.24×10-8 m2·s-1，并利用Arrhenius方程建立有效扩散系数与温度的关系，得到薄层市政污泥水分扩散的活化能为31.32 kJ·mol-1。 |
| 英文摘要: |
| The drying characteristics of dewatered municipal sludge from a municipal wastewater treatment plant in Jiaxing City at different thicknesses and temperature were experimentally studied. Furthermore, the simulation analysis of its drying process was performed by thin layer drying models. The results showed that the drying rate of the sludge became larger with the decrease of thickness or drying temperature. The maximum drying rate increased from 0.025 87g·（g·min）-1 to 0.081 58 g·（g·min）-1 when the temperature rose from 70 ℃ to 130 ℃. In the view of energy saving, higher temperature led to more energy consumption, which was detrimental to the effective utilization of energy. Midilli model could describe the relationship between the change of moisture content in the sludge and time well. The effective diffusion coefficients for the thin layer drying of municipal sludge ranged within 5.96×10-9 and 3.24×10-8 m2·s-1. The relationship between effective diffusion coefficient and temperature was established by Arrhenius equation. The activation energy of moisture diffusion for the thin layer of the sludge was 31.32 kJ·mol-1. |
| HTML 查看全文 查看/发表评论 下载PDF阅读器 |
| 关闭 |
