The thermogravimetric analysis experiment on sludge, sawdust and their mixture were carried out by thermogravimetric analyzer. Based on the double extrapolation method, the most probabilistic mechanism functions of the co-pyrolysis process of the mixture were obtained by combining several conventional solid pyrolysis mechanism functions. The results showed that there were two weight loss peaks in the DTG curve with mass ratio of sludge to sawdust 9:1. The main decomposition temperature range was 230-500℃ with a weight loss of about 47.1 %. The addiction of sawdust reduced the apparent activation energy (E) of the mixture and the peak appeared to shift to the high temperature. TheE value of DTG peak varied slightly with the increase of heating rate, and there was a kinetic compensation effect betweenE and pre-exponential factor (A). The most probable mechanism functions of co-pyrolysis of the mixture before and after the DTG peak (230-350 and 350-500℃) were the Nucleation-Growth (n=4) and Chemical reaction (second order), respectively.%利用热重分析仪对污泥、锯末及其混合物进行了热重分析实验.基于双外推法,结合几种常规固体热解机理函数确定了污泥与锯末共热解过程最概然机理函数.结果表明:污泥与锯末按质量比9:1混合共热解热重(DTG)曲线存在两个失重峰,主要热分解温度区间为230~500℃,失重量约47.1%;锯末的加入使混合物的表观活化能(E)降低,波峰出现右移;DTG波峰前后E值随升温速率增大有微小变化,且E与指前因子(A)之间具有动力学补偿效应;污泥与锯末共热解DTG峰前(230~350℃)最概然机理函数为Nucleation-Growth(n=4)模型,峰后(350~500℃)为Chemical reaction(second order)模型.
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