基于非等温热重分析法的醋糟燃烧动力学特性分析

利用非等温热重分析法,在不同升温速率、样品粒径及氧气体积分数条件下对特殊的生物质醋糟进行了燃烧特性的研究,分析了不同条件对醋糟燃烧特性参数的影响,并且建立了醋糟的燃烧动力学方程,计算了燃烧动力学参数及机理函数。结果表明:升温速率的增大有助于醋糟的燃烧。样品粒径及氧气体积分数的影响相对较小,且其值变化到一定值后影响不再明显。由Satava-Sestak法计算得到了醋糟燃烧动力参数:活化能Es、指前因子As、机理函数的积分形式G(α)。得到G(α)=[-ln(1-α)]3,醋糟的挥发分析出和燃烧阶段及固定碳燃烧阶段的Es和lgAs都比较相近,Es为120～130 kJ/mol,lgAs为9～11。

Combustion Kinetics Characteristic Analysis on Vinegar Residue Based on Non-isothermal Thermogravimetric Analysis

The combustion behavior of vinegar residue was studied under the different heating rate,particle size,and oxygen volume fraction by non-isothermal thermogravimetric analysis.The influence of different conditions on burning performance parameters of vinegar residue was investigated.A combustion kinetic equation of vinegar residue was built,and the combustion kinetic parameters were obtained.The results showed that the increase of heating rate was helpful to the combustion of vinegar residue.The influence of particle size and oxygen volume fraction was relatively small.And when the value changes to a certain value,the influence was not obvious any more.According to the calculation of Satava-Sestak method,the combustion kinetic parameters,such as activation Es and pre-exponential factor As and mechanism function G(α) of vinegar residue were got.And G(α)=[-ln(1-α)]3.The values of Es and lgAs in the devolatilization and combustion stage and the fixed carbon combustion stage were similar.Es was about 120～130kJ/mol,and lgAs was about 9~11.