超声处理对污泥热解特性及反应动力学影响  

Effects of ultrasonic treatment on pyrolysis characteristics and reaction kinetics of municipal sludge

作　　者：张秀霞[1] 贾宏宇 刘炳琨 ZHANG Xiuxia;JIA Hongyu;LIU Bingkun(College of Mechanical Engineering in China University of Petroleum(East China), Qingdao 266580, China)

机构地区：[1]中国石油大学(华东)化学工程学院,山东青岛266580

出　　处：《中国石油大学学报（自然科学版）》2022年第1期171-176,共6页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：中国石油科技创新基金研究项目(2018-5007-0605,2017-5007-0601);中国石油集团安全环保关键技术项目(2017D-4613)。

摘　　要：采用热重分析法研究超声处理对城市污泥热解过程的影响,依据Coats-Redfern积分法和截距相对误差筛选原则对其热解动力学进行分析,确定超声处理污泥热解最概然机制函数和动力学参数,考察超声处理对污泥热解特性及动力学参数的影响。结果表明经超声处理后,污泥热解机制在热解温度300~440℃内由三维扩散发展成为随机成核和随后生长,该区间的表观活化能由18.29 kJ·mol^(-1)提高到26.32 kJ·mol^(-1),频率因子由24.78 min^(-1)提高到2761.62 min^(-1),热解总反应的平均活化能由15.21 kJ·mol^(-1)降低到14.65 kJ·mol^(-1),超声处理加快了污泥热解反应整体的反应速率。The effect of ultrasonic treatment process on pyrolysis reaction kinetics of municipal sludge was studied.On the basis of the Coats-Redfern integral method and relative error intercept screening principle,the pyrolysis kinetics was analyzed,the most probable mechanism function and kinetic parameters of ultrasonic treatment sludge were determined.The effect of ultrasonic pretreatment on the sludge pyrolysis characteristics was investigated.The results show that the sludge pyrolysis mechanism is becoming from three-dimensional diffusion to random nucleation and subsequent growth in the pyrolysis temperature range of 300-440℃.The apparent activation energy in this temperature zone is increased from 18.29 kJ·mol^(-1) to 26.32 kJ·mol^(-1),and pre-exponential factor is increased from 24.78 min^(-1) to 2761.62 min^(-1).The average activation energy of pyrolysis total reaction is decreased from 15.21 kJ·mol^(-1) to 14.65 kJ·mol^(-1).The pyrolysis reaction can be carried out more easily for the sludge after ultrasonic pretreatment.

关 键 词：超声处理 污泥 热解 热重试验 反应动力学 

分 类 号：X705[环境科学与工程—环境工程]