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℃.
作者
孟庆杭
宋刚
胡远丰
胡光涛
王晓波
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)
出处
《广州化工》
CAS
2021年第17期87-91,共5页
GuangZhou Chemical Industry
关键词
城市污泥
低温
干燥模型
有效扩散系数
表观活化能
municipal sludge
low temperature
drying model
effective diffusion coefficient
apparent activation energy