木粉爆炸最大压力预测模型的修正  

Modification of the prediction model of the maximum explosion pressure of wood powder

作　　者：胡涛平[1] 喻孜[1] 郭露 徐长妍 HU Taoping;YU Zi;GUO Lu;XU Changyan(College of Science,Nanjing Forestry University,Nanjing 210037,China;College of Materials Science and Engineering,Nanjing Forestry University,Nanjing 210037,China)

机构地区：[1]南京林业大学理学院,南京210037 [2]南京林业大学材料科学与工程学院,南京210037

出　　处：《林业工程学报》2020年第5期40-44,共5页Journal of Forestry Engineering

基　　金：国家重点研发计划(2016YFD0600703-1)。

摘　　要：粉尘爆炸一旦发生,极可能造成重大人员伤亡及经济损失。因此,构建准确的粉尘燃爆理论模型,可为粉尘燃爆防控、相关技术研发以及行业加工安全生产提供理论依据。针对木粉爆炸的试验数据,通过热力学基本原理及燃烧反应动力学对木粉爆炸最大压力进行理论建模。与Callé模型相比,本模型考虑了爆炸过程中爆炸压力受未燃烧木粉吸热的影响,并利用分子碰撞理论和过渡态理论修正了反应速率常数。利用本模型对试验数据进行拟合,得到最大爆炸压力理论计算值与试验值偏差最小为0.1%。此外,本模型还仿真计算了Callé模型未理论计算的3组不同质量木粉的试验数据,结果表明:以本模型计算得到的爆炸压力上升曲线与试验数据高度吻合,最大爆炸压力理论计算值与试验数据的平均偏差为1.3%左右;计算结果弥补了Callé模型的不足,并很好地诠释了试验现象。本模型进一步拟合了木粉质量连续变化情况下的最大爆炸压力曲线,最大爆炸压力先随木粉质量的增加而上升,在到达极大值后,再随木粉质量的增加而下降,与试验测量结果完全一致。通过对连续木粉质量的计算,本模型可以预估给定木粉质量时的最大爆炸压力,为燃爆的防控提供理论依据。Once the dust explosion occurred,it would probably cause heavy casualties and huge economic losses.Therefore,the establishment of an accurate theoretical model of dust explosion could provide theoretical basis for the prevention and control of dust explosion,the research and development of related technologies and the safe production of the industrial processing.Based on the experimental data of wood powder explosion,the theory of wood powder maximum explosion pressure was modeled from the basic principles of thermodynamics and combustion reaction kinetics.Compared with the theoretical model established by Calle,this proposed theoretical model considered the effect of heat absorption of unburned wood powder on the explosion pressure,the molecular collision theory and the transition state theory were used to revise the reaction rate constant.This model was used to fit the experimental data.It could be found that the minimum deviation between the theoretical calculation result of the maximum explosion pressure and the experiment value was only 0.1%.In the Calle’s model,the thermal conductivity of wood powder was considered to be very low,so the endothermic effect of unburned wood powder on the reaction of explosion was neglected.However,the increase of explosion pressure was due to the increase of temperature caused by the heat absorption of gas.Therefore,if the heat that should be absorbed by the unburned wood powder was ignored,it must be calculated as the heat absorption of the gas,so the calculated pressure was higher than the measured value of the experiment.In addition,this model also numerically simulated and calculated the experimental data of three groups of wood powder with different masses without theoretical calculation of Calle’s model.The results showed that the explosion pressure curve fitted by this model was highly consistent with the experimental data,and the average deviation between the calculated value of the maximum explosion pressure and the experimental data was about 1.3%.The results ma

关 键 词：木粉 爆炸 最大爆炸压力 理论分析 

分 类 号：S781.3[农业科学—木材科学与技术]