考虑水分影响的木材热解过程数学模拟  

Mathematical model of wood pyrolysis considering effects of moisture

作　　者：严晓龙[1] 袁兵[2] 余春江[3] 方梦祥[3] 

机构地区：[1]浙江省消防总队,浙江杭州310014 [2]江苏省电力设计院,江苏南京210024 [3]浙江大学能源清洁利用与环境工程教育部重点实验室,浙江杭州310027

出　　处：《消防科学与技术》2005年第6期679-684,共6页Fire Science and Technology

基　　金：国家重点基础研究发展规划项目(2001CB409600)

摘　　要：针对常见可燃物在典型火场情形中的热解行为提出了一种考虑水分影响的数学模型。模型采用了一阶阿仑尼乌斯热解动力学,考虑了固体内部瞬间传热过程、对流传热、热解过程的热效应,水分和挥发分流动等过程,模型揭示了热解木材中的温度、失重率和水分变化等重要特性。计算得到的结果和试验值吻合较好,通过对不同辐射,不同含水率下的木材可燃物热解过程的模拟计算,预测了木材在典型火灾环境中的热解行为。A mathematical model of the wood pyrolysis based on typical materials in fire which includes effects of moisture is presented. This model adopted Arrenhius kinetic schemes, include transient conduction, heat convection, gas and water convection and endothermic effects of pyrolysis, can provide detailed information of a series of important parameters, such as temperature, mass loss rate and water evaporation. Good agreements between experimental and theoretical results are obtained. It was also observed that moisture content and radiant heat flux are very important factors tending to affect on pyrolysis characteristic by analyzing the model results.

关 键 词：辐射热流量 热解 数学模型 木材 

分 类 号：TK12[动力工程及工程热物理—工程热物理] TQ351.2[动力工程及工程热物理—热能工程]