不同粒径城市污泥热解和燃烧动力学研究  

Research on the Pyrolysis and Combustion Kinetics of Sewage Sludge of Different Sizes

作　　者：翟云波[1] 彭文锋[1] 蒋剑虹[2] 庞道雄[1] 陈红梅[1] 王尝[1] 李彩亭[1] 路培[1] 

机构地区：[1]湖南大学环境科学与工程学院,湖南长沙410082 [2]中机国际工程设计研究院有限责任公司,湖南长沙410021

出　　处：《湖南大学学报（自然科学版）》2012年第3期66-70,共5页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(50908080;51108169);湖南省自然科学基金重点资助项目(11JJ2032);中央高校基本科研业务费资助项目

摘　　要：采用德国耐驰公司STA 409pc热重分析仪,对3个不同粒径的污泥颗粒(d≤0.25mm,0.25mm<d≤0.83mm和d>0.83mm)以升温速率20℃/min在纯氮和空气气氛中进行实验,并对污泥进行了元素分析和工业分析,对金属的含量进行测定.采用MATLAB 7.11.0(R2010b)中的surface fitting tool进行平面拟合的方法计算了相关的动力学参数.结果表明,污泥的热解可以分为3个阶段:水析出阶段(100～180℃)、挥发份热解阶段(205～550℃)和部分难挥发有机物与无机物的降解阶段(550～900℃).而污泥的燃烧可以分为4个阶段:水析出阶段(100～180℃)、挥发份的燃烧阶段(180～475℃)、碳燃烧阶段(475～595℃)和无机盐分解阶段(595～900℃).不同粒径下污泥热解第2阶段活化能约为48kJ/mol,反应级数为1.5～1.8.燃烧第2阶段的活化能约为33kJ/mol,反应级数为1.1～1.8.燃烧第3阶段活化能约为176kJ/mol,反应级数为1.1～1.2.The pyrolysis and combustion of sewage sludge particles （d≤0.25 mm, 0.25 mm〈d 40.83 mm and d〉0. 83 mm） were analyzed with the thermogravimetric analyzer （TGA, STA 409 model, NETZSCH, Germany） at the heating rate of 20 ℃/min. To determine the chemical characteristics of sew- age sludge, elemental and proximate analysis was carried out, and the metal content of the dry sewage sludge was determined. Meanwhile, a new method was developed to calculate pyrolysis kinetic parameters with surface fitting tool in software MATLAB7. ll. 0 （R2010b）. The results have shown that sewage sludge pyrolysis process are divided into three stages, water evaporation （100-180 ℃）, volatile matter pyrolysis （205-550℃） and inorganic salt decompose （550-900 ℃）. Sewage sludge combustion process are divided into four stages： water evaporation （100-180 ℃）, volatile matter combustion （180-475℃）, carbon combustion （475-595 ℃） and inorganic salt decompose （595-900℃）. The pyrolysis kinetic parameters of the second stage are as follows： the reaction orders are in the range of 1.5-1.8 and the activation energy is about 48 kJ/mol. The combustion kinetic parameters of the second stage and the third stage are as follows： the reaction orders are in the range of 1.2- 1.3 and 1.1 - 1.2, and the activation energy is about 48 kJ/mol and 176 kJ/mol respectively.

关 键 词：污泥 热解 燃烧 动力学 

分 类 号：X705[环境科学与工程—环境工程]