摘要
腐殖质是森林地下火阴燃的主要对象,分析其热解特性、计算动力学参数,对于预测和扑灭地下火有重要的理论意义。本研究以落叶松林地的腐殖质为研究对象,利用热重分析仪进行3种升温速率下的热解试验,针对试验数据的动力学参数计算提出一种多峰拟合模型。模型基于失重速率和加速率曲线获得特征点,在特征点计算拟合峰,每条曲线得到4个拟合峰,利用其计算动力学参数。结果显示:拟合峰Ⅰ的活化能较低,对应DTG曲线第一个峰部;拟合峰Ⅱ、Ⅲ的活化能处于中等水平,对应DTG曲线的第一个肩部和第二个峰部;拟合峰Ⅳ的活化能最高,对应DTG曲线的最后一个肩部。模型的参数计算结果与Gorbatchev积分法计算的动力学参数区间吻合。对模型进行残差和拟合优度检验,拟合检验(F检验)的P<0.0001,均方根误差RMSE<0.005,拟合优度R2≥0.99。检验结果表明,多峰拟合模型能有效地分解腐殖质热解的子反应并计算动力学参数值,具有一定的理论意义和实践指导价值。
Humus is the main object of forest underground fire shaded combustion,and analyzing its pyrolysis characteristics and calculating kinetic parameters are of great theoretical significance for predicting and extinguishing underground fires.In this study,humus from larch woodland was taken as the object of study,and pyrolysis experiments were carried out under three kinds of heating rates using a thermogravimetric analyzer,and a multi-peak fitting model was proposed for the calculation of kinetic parameters of the experimental data.The model was based on the weight loss rate and acceleration rate curves to obtain the characteristic points,and the fitted peaks were calculated at the characteristic points,and four fitted peaks were obtained for each curve,which were utilized to calculate the kinetic parameters.The results showed that:the activation energy of the fitted peakⅠwas low,corresponding to the first peak of the DTG curve;the activation energies of the fitted peaksⅡandⅢwere in the middle level,corresponding to the first shoulder and the second peak of the DTG curve;the activation energy of the fitted peakⅣwas the highest,corresponding to the last shoulder of the DTG curve.The results of the model's parameter calculations coincide with the kinetic parameter intervals calculated by the Gorbatchev integration method.The residual and goodness-of-fit tests were performed on the model,and the P<0.0001,root mean square error RMSE<0.005,and goodness-of-fit R2≥0.99 of the fit test(F-test)were obtained.The test results indicated that the multi-peak fitting model can effectively decompose the sub-reactions of humus pyrolysis and calculate the kinetic parameter values,which has certain theoretical significance and practical guidance value.
作者
池泓颖
辛颖
黄天棋
张敏
Chi Hongying;Xin Ying;Huang Tianqi;Zhang Min(College of Mechanical and Electrical,Northeast Forestry University,Heilongjiang Harbin 150040,China)
出处
《消防科学与技术》
CAS
北大核心
2024年第7期1016-1022,共7页
Fire Science and Technology
基金
中央高校基本科研业务费专项资金资助项目(2572015CB05)
黑龙江省自然科学基金联合引导项目(LH2020C047)。
关键词
落叶松
腐殖质
地下火
热解动力学
多峰拟合模型
Larix gmelinii
humus
kinetics
pyrolysis kinetics
multi-peak fitting model
