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基于等温热重分析技术,采用化学动力学法拟合燃烧过程中质量损失率与时间的单方程模型,对不同燃烧温度与成型密度下柱状玉米秸秆成型颗粒的快速燃烧特性进行研究。结果表明:玉米秸秆成型颗粒在600℃下成型密度较大,燃尽时间较长,到达热失重速率(DTG)曲线峰值时间较长;相同密度的成型颗粒,随温度的升高,燃尽时间缩短,DTG峰值高度越高,到达峰值的时间越短;在该实验变量控制范围内,成型密度和外部环境温度对燃尽率无明显作用;通过动力学计算得到玉米秸秆成型颗粒的反应级数在0.5~0.7之间。由实验数据曲线拟合得到拟合方程,求解出活化能E及指前因子A。
Based on isothermal gravimetric analysis (TGA), the single-equation model of mass loss rate and time in the combustion process was fitted by chemical kinetic method, and the rapid combustion characteristics of the columnar corn stalks with different combustion temperatures and molding densities were studied. The results showed that the molding temperature of corn stalks was higher at 600 ℃, longer burnout time, and reached the peak value of DTG curve at longer time. With the increase of temperature and burnout time Shortened, the peak height of DTG is higher and the peak time is shorter; within the control range of the experimental variables, the molding density and the external ambient temperature have no significant effect on the burn-up rate; the reaction order of the corn stalks forming particles is obtained through the kinetic calculation Between 0.5 ~ 0.7. The fitting equation is obtained from the experimental data curve fitting, and the activation energy E and the pre-exponential factor A are solved.