摘要
本文建立了线性菲涅尔式太阳能吸热/反应器光热–化学反应过程三维数值模型,并对其缩小模型进行了研究,探究了典型的外部因素(太阳能热流分布)和内部因素(催化剂颗粒半径)对系统流动换热与热化学反应综合性能的影响。首先,基于离散元法建立了催化剂颗粒随机堆积床模型。其次,基于蒙特卡罗光线追迹法与多目标优化遗传算法获得了太阳能热流分布。然后,对比了优化前的、优化后的以及理想情况下的系统综合性能,进一步分析了催化剂颗粒半径的影响。研究发现,热流优化后的系统化学反应性能接近于理想,而减小颗粒半径也可促进化学反应,但会增加流动阻力。催化剂颗粒大小的优选或可综合考虑反应程度、流动阻力和烧结温度限制等进行权衡选取。
In this paper, a three-dimensional numerical model of the linear Fresnel solar receiver/reactor(LFSRR) photo-thermal-chemical reaction process is established. The miniature LFSRR packed bed model is studied to explore the effects of the typical external factor(e.g., the solar heat flux distribution) and internal factor(e.g., the catalyst particle radius) on the comprehensive performance of the fluid flow, heat transfer and thermochemical reaction of the LFSRR system.Firstly, the random packing bed model of catalyst particles was established based on the discrete element method. Secondly, the solar heat flux distribution was obtained based on the Monte Carlo ray tracing method and multi-objective optimization genetic algorithm. Then, the comprehensive performance of LFSRRs before optimization, after optimization and under the corresponding ideal condition was compared. Subsequently, the influence of the catalyst particle radius was further analyzed. It is found that the chemical reaction performance of the LFSRR system after optimization is close to ideal. Reducing the particle radius can also promote the chemical reaction, but it will increase the flow resistance. There could be a tradeoff between chemical reaction performance, flow resistance and sintering temperature limit for optimizing the particle size.
作者
门静婧
高哲
卫元珂
程泽东
何雅玲
MEN Jingjing;GAO Zhe;WEI Yuanke;CHENG Zedong;HE Yaing(Key Laboratory of Thermo-Fluid Science and Engineering of Ministry of Education,School of Energy and Power Engineering,Xi'an Jiaotong University,Xi'an,Shaanxi,710049,China;Nanjing Institute of Future Energy System,Nanjing,Jiangsu,211135,China)
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2023年第2期497-504,共8页
Journal of Engineering Thermophysics
基金
国家自然科学基金面上项目(No.51976158)
陕西省自然科学基础研究计划项目(No.2019JQ-186)。
关键词
线性菲涅尔聚光集热器
颗粒堆积床
甲醇蒸汽重整制氢
热流条件
综合性能
linear Fresnel concentrator
particle packed bed
methanol steam reforming for hydrogen production
heat flux conditions
comprehensive performance
