摘要
已有的废塑料热裂解过程中动力学模型计算方法不准确,在机理函数模型的选择时,通常出现模型活化能与实际活化能之间存在较大误差的问题。研究了一种新的修正模型的计算方法,该算法由2个模型中活化能相对最优的模型根据其权重进一步构建出的一个新模型,修正模型的模型活化能比原来的2个最优模型的模型活化能更接近于实际活化能。首先由FWO、KAS和STA 3种无模型法计算出实际的活化能,再使用该修正模型结合Coats-Redfern方程对其模型活化能和机理函数G(α)进行计算。以PP与LDPE的实验数据进行计算,对比分析了升温速率、无模型法和修正系数比对误差造成的影响,结果表明,与原模型相比,修正模型误差降低了1%~14%。准确的机理函数能够使动力学模型计算方法更加准确,有助于优化废塑料裂解过程中的各个工艺参数。
The kinetic model calculation methods used in the current pyrolysis process of waste plastics are inaccurate.The selection of the mechanism function model often encounters significant discrepancies between the model activation energy and the actual activation energy.A new calculation method for a modified model was explored here.This algorithm constructs a new model by further combining the two relatively optimal model activation energies according to their weights.The activation energy of the modified model was closer to the actual activation energy than the original optimal models.First,the actual activation energy was calculated using the FWO,KAS,and STA model-free methods.Then,the modified model was used in conjunction with the Coats-Redfern equation to calculate the model activation energy and the mechanism function G(α).The pyrolysis data of PP and LDPE were used for the calculations,and the effects of heating rate,model-free methods,and the error caused by the correction factor ratio were compared.The results showed that the error of the modified model was reduced by 1%~14%compared to the original model.An accurate mechanism function could lead to a more precise calculation of the kinetic model,optimizing various process parameters in the pyrolysis of waste plastics.
作者
李亚峰
张茗昱
刘硕
康圣明
尹凤福
LI Yafeng;ZHANG Mingyu;LIU Shuo;KANG Shengming;YIN Fengfu(School of Mechanical and Electrical Engineering,Qingdao University of Science and Technology,Qingdao,Shandong 266100,China)
出处
《塑料》
北大核心
2025年第6期47-51,共5页
Plastics
关键词
动力学
塑料热解
指前因子
活化能
机理函数
dynamics
pyrolysis of plastics
preexponential factor
activation energy
mechanistic functions
