低温条件下城市污泥干燥特性及动力学分析  

Analysis of Characteristics and Kinetics of Municipal Sludge Drying at Low Temperature Conditions

作　　者：孟庆杭 宋刚[1] 胡远丰 胡光涛[1] 王晓波[1] MENG Qing-hang;SONG Gang;HU Yuan-feng;HU Guang-tao;WANG Xiao-bo(Jiangsu Xukuang Comprehensive Utilization Power Co.,Ltd.,Jiangsu Xuzhou 221000,China)

机构地区：[1]江苏徐矿综合利用发电有限公司,江苏徐州221000

出　　处：《广州化工》2021年第17期87-91,共5页GuangZhou Chemical Industry

摘　　要：为研究低温条件下城市污泥的干燥特性,分别在40℃、50℃、60℃、70℃下对3 mm、5 mm、7 mm、10 mm厚的污泥进行了干燥实验,得出干燥模型,并分析了干燥动力学。结果表明:污泥干燥速率与污泥厚度、干燥温度有密切关系;Midilli模型能很好的模拟污泥低温干燥过程;3 mm、5 mm、7 mm、10 mm厚污泥在40-70℃下的水分有效扩散系数分别为3.610×10^(-8)-7.440×10^(-8) m^(2)/s、5.670×10^(-8)-1.226×10^(-7)m^(2)/s、1.033×10-7-2.562×10^(-7)m^(2)/s、1.459×10-7-3.850×10^(-7)m^(2)/s;污泥在40-70℃下表观活化能分别为21.20 kJ/mol、23.13 kJ/mol、26.58 kJ/mol、29.32 kJ/mol。In order to study the drying characteristics of municipal sludge under low temperature conditions,drying experiments were carried out on 3 mm,5 mm,7 mm and 10 mm thick sludge at 40℃,50℃,60℃and 70℃respectively,the drying model was got by calculating the experimental results and analyzing its drying kinetics.The results showed that the sludge drying rate was closely related to the thickness and drying temperature.The Midilli model can simulate the low-temperature drying process of the sludge well.The water effective diffusion coefficients of 3 mm,5 mm,7 mm and 10 mm thick sludge was 3.610×10^(-8)-7.440×10^(-8) m^(2)/s,5.670×10^(-8)-1.226×10^(-7)m^(2)/s,1.033×10-7-2.562×10^(-7)m^(2)/s,1.459×10-7-3.850×10^(-7)m^(2)/s at 40-70℃.The apparent activation energy of sludge was 21.20 kJ/mol,23.13 kJ/mol,26.58 kJ,29.32 kJ/mol at 40-70℃.

关 键 词：城市污泥 低温 干燥模型 有效扩散系数 表观活化能 

分 类 号：TQ018[化学工程]