高斯拟合在污泥热重曲线解析中的应用  

Application of Gaussian fitting in resolution of sludge thermo-gravimetric curves analyzing

作　　者：程诚[1] 黄亚继[1] 孙宇[1] 王昕晔[1] 

机构地区：[1]东南大学能源与环境学院,能源热转换及其过程测控教育部重点实验室,江苏南京210096

出　　处：《中南大学学报（自然科学版）》2014年第11期4081-4086,共6页Journal of Central South University:Science and Technology

基　　金：国家重点基础研究发展规划("973"计划)项目(2011CB201505);国家自然科学基金资助项目(51006023)~~

摘　　要：对2种不同种类污泥的燃烧过程进行热重分析（TG）,研究升温速率对燃烧特性的影响,运用高斯多峰拟合方法对热重曲线解析,基于平行反应机理将燃烧过程分解为3个独立的平行反应。根据平行反应机理建立动力学模型,计算不同升温速率下各组分活化能。研究结果表明：热重曲线可以分解为3个彼此交叉的高斯拟合峰,分别对应污泥中挥发分、生物可降解物质和固定碳的燃烧过程,挥发分的燃烧区间为200-400℃,生物可降解物质的燃烧区间为400-500℃,固定碳的燃烧区间为500-800℃。各组分活化能随升温速率的变化趋势表明：无限制增加升温速率反而不利于各组分活化能的降低。The combustion characteristics of two samples of sewage sludge were investigated by thermo-gravimetry（TG）technology to analyze the combustion characteristics at different heating rates. Based on parallel reaction model,multi-peaks Gaussian fitting was utilized to analyze the first derivative curves of mass loss. The dynamic model was established based on parallel reaction model to achieve activation energy at different heating rates. The results show that thermo-gravimetric curves can be decomposed into three independent parallel reactions attributed to the combustion of volatile at 200-400 ℃, the combustion of biodegradable substances at 400-500 ℃ and the combustion of fixed carbon at500-800 ℃ respectively. Trend of activation energy with the heating rate indicates that increasing heating rate to excess is not beneficial to the reducing of activation energy of each component.

关 键 词：污泥 高斯多峰拟合 热重分析 活化能 

分 类 号：X705[环境科学与工程—环境工程]