摘要
氨基热化学储能是一种极具研究价值的热化学储能方式,氨反应器内的反应特性更是与太阳能流密度息息相关。以非均匀热流密度下的氨反应器为研究对象,建立了一个基于反应动力学和传热传质的催化氨分解三维反应器模型。针对氨反应模型,揭示了固体和流体的换热系数、有效导热系数以及有效扩散系数对氨分解的内在影响机制。通过定量定性的分析和讨论催化剂颗粒直径、孔隙率以及径向孔隙率分布对氨反应特性的影响,给出了优化氨反应管性能的方法。模拟结果表明,催化剂颗粒直径越小,孔隙率越小,氨的分解率越大,同时壁面峰值温度越低;采用孔隙率径向线性减小的分布方式可以在降低壁面峰值温度的同时又不降低氨分解率。最终优选的反应管参数为:颗粒直径为0.5 mm,孔隙率为径向分布0.8~0.2。
Amino thermochemical energy storage method is of great research value,and the reaction characteristics in ammonia reactor are closely related to solar energy flow density.This paper takes the ammonia reactor under non-uniform heat flux as the research object,and establishes a three-dimensional reactor model of catalytic ammonia decomposition based on reaction kinetics and heat and mass transfer.In view of the ammonia reaction model,the heat transfer coefficient of solids and fluids,effective thermal conductivity and effective diffusion coefficient are revealed to affect the internal influence mechanism of ammonia decomposition.Through quantitative and qualitative analysis and discussion of the influence of catalyst particle diameter,porosity and radial porosity distribution on ammonia reaction characteristics,a method to optimize the performance of ammonia reaction tubes is put forward.The simulation results show that the smaller the catalyst particle diameter,the smaller the porosity,the greater the decomposition rate of ammonia,and the lower the peak wall temperature.The distribution method of radial linear reduction of porosity can reduce the peak temperature of the wall without reducing the ammonia decomposition rate.The final optimal reaction tube parameters are:the particle diameter is 0.5 mm,and the porosity is radially distributed from 0.8 to 0.2.
作者
阮景昕
邓泽宏
胡甜
王跃社
RUAN Jingxin;DENG Zehong;HU Tian;WANG Yueshe(State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China;Science and Technology on Reactor System Design Technology L aboratory ,Nuclear Power Institute of China ,Chengdu 610213,China;Powerchina Solar Thermal Power Engineering Research Center, Xi'an 710065, China)
出处
《西北水电》
2021年第5期119-126,共8页
Northwest Hydropower
基金
国家自然科学基金国际合作与交流项目(51961135102).
关键词
热化学储能
氨分解反应
单管反应器
三维模型
thermochemical energy storage
ammonia decomposition reaction
single tube reactor
three-dimensional model
