热解半焦颗粒携带流中着火特性的数值模拟  

Numerical Simulation of Ignition Characteristics of Pyrolytic Semi-Coke Particles in Entrained Flow

作　　者：袁梦帆 孙锐[1] 齐洪亮 李昱澎 Yuan Mengfan;Sun Rui;Qi Hongliang;Li Yupeng(Institute of Combustion Technology,Harbin Institute of Technology,Harbin 150001,China;Research Center of Midea Group Co.,Ltd,Foshan 528311,China)

机构地区：[1]哈尔滨工业大学燃烧工程研究所,哈尔滨150001 [2]美的集团中央研究院,佛山528311

出　　处：《燃烧科学与技术》2021年第6期591-598,共8页Journal of Combustion Science and Technology

基　　金：国家重点研发计划资助项目(2017YFB0602002).

摘　　要：采用实测法获得了适用于热解半焦的单方程热解动力学参数:E=230 kJ/mol,k_(0)=4×10^(11)s^(-1),并建立了携带流条件下热解半焦颗粒的瞬态着火模型,研究了氧体积分数和环境温度对热解半焦颗粒着火特性的影响.结果表明:提高氧体积分数和环境温度可使热解半焦的着火提前;随氧体积分数增加,着火模式由均相着火向联合着火模式转变;在环境温度为1600~1800K范围内,5%~15%氧体积分数下为均相着火模式,20%~30%氧体积分数下为联合着火模式;同一氧体积分数下,环境温度由1600K增加到1800K时不改变着火模式.The single equation kinetic parameters suitable for pyrolytic semi-coke were obtained by the measured method,i.e.,E=230 kJ/mol and k_(0)=4×10^(11) s^(-1).The transient ignition model of pyrolytic semi-coke particles was established under the condition of entrained flow.The effects of oxygen volume fraction and ambient temperature on the ignition characteristics of pyrolytic semi-coke particles were studied.The results show that the ignition of pyrolytic semi-coke can be advanced by increasing the oxygen volume fraction and ambient temperature.With the increase of oxygen volume fraction,the ignition mode changes from homogeneous to combined.In the range of ambient temperature from 1600K to 1800K,the homogeneous ignition mode is observed at 5%—15%oxygen volume fraction,and the combined ignition mode is observed at 20%—30%oxygen volume fraction.Under the same oxygen volume fraction,the ignition mode does not change when the ambient temperature increases from 1600K to 1800K.

关 键 词：热解半焦 高温携带流 脱挥发分模型 瞬态着火模型 数值计算 

分 类 号：TK16[动力工程及工程热物理—热能工程]