微波热解玉米穗轴颗粒数值模拟  

Numerical simulation on microwave pyrolysis of corn cob

作　　者：裴云雾 陈雪雪 王欣然 肖心满 蒋莉[1] 周文鳞 PEI YUNJI;CHEN Xuexue;WANG Xinran;XIAO Xinman;JIANG Li;ZHOU Wenlin(School of Resources and Environmental Engineering,Jiangsu University of Technology,Changzhou 213001,China;Laboratory and Equipment Management Center,Jiangsu University of Technology,Changzhou 213001,China)

机构地区：[1]江苏理工学院资源与环境工程学院,江苏常州213001 [2]江苏理工学院实验室与设备管理中心,江苏常州213001

出　　处：《江苏理工学院学报》2025年第1期118-126,共9页Journal of Jiangsu University of Technology

基　　金：国家自然科学基金青年基金项目(41907116),14C示踪法研究微塑料对土壤中三氯生归趋和生物有效性的影响及机制;江苏理工学院研究生实践创新计划项目(XSJCX24_89),微波热解定向玉米芯生物炭制备及环境经济效益分析。

摘　　要：为了提高微波加热生物质的效率,采用基于有限元的COMSOL仿真软件对玉米穗轴颗粒的加热过程进行数值模拟。探究了波导位置(侧馈和底馈)和波导数量(单馈、双馈和三馈)对腔内电场、温度场分布的影响。模拟的微波频率为2.45 GHz,功率为300 W。模拟结果表明:波导的位置和数量都会影响样品内部物理场的分布;相同热解时间条件下,底馈微波反应器比侧馈微波反应器的电场强度更高,可达2.5×10^(4) V/m,因此加热速率更快、获得的末温更高;相同热解时间内,双波导微波反应器的最高电场强度与底馈微波反应器相同,但末温更高,可达900℃,温度分布也更均匀;三馈既不能提高电场强度,也不能获得均匀的温度分布。实验所测温度和模拟温度的均方根差仅为9.4℃,表明运用COMSOL模型进行生物质样品的热解模拟是可行的。In order to improve the efficiency of microwave heating of biomass,the finite element based COMSOL simulation software is used to numerically simulate the heating process of corn cob particles.The influence of the waveguide position(side-fed and bottom-fed)and waveguides quantity(single-fed,double-fed,and triple-fed)on the distribution of the electric field and temperature field inside the cavity are investigated.The simulated microwave frequency is 2.45 GHz and the power is 300 W.The simulation results indicate that the position and number of waveguides will affect the distribution of the physical field inside the sample.Under the same pyrolysis time conditions,the bottom fed microwave reactor has a higher electric field strength than the side fed microwave reactor,reaching 2.5×10^(4) V/m,resulting in a faster heating rate and higher final temperature obtained.Within the same pyrolysis time,the maximum electric field strength of the dual waveguide microwave reactor is the same as that of the bottom fed microwave reactor,but the final temperature is higher,reaching up to 900℃,and the temperature distribution is also more uniform.Three waveguides can neither increase the electric field strength nor obtain a uniform temperature distribution.The root mean square difference between the measured temperature and the simulated temperature in the experiment is only 9.4℃,indicating that using the COMSOL model for biomass sample pyrolysis simulation is feasible.

关 键 词：微波 波导 电磁-热耦合 数值模拟 

分 类 号：TQ352.6[化学工程]