摘要
以直吸式太阳能热化学反应器为研究对象,运用数值模拟的方法,以甲烷裂解反应为例,分析入射辐射焦点位置对反应效率的影响。使用反应转化率和化学储能效率为评价指标,结合氢气质量分数云图、辐射强度分布云图等进行分析。结果表明焦点位置越靠后,反应器的集热效果和反应效果越好,入射光线最大夹角从90°减至53°,反应转化率和化学储能效率的增长最明显,当入射光线最大夹角小于53°,随着角度的减小,反应的转化率和化学储能效率变化并不明显。该文研究结果可为直接吸收式太阳能热化学反应器及聚光器的设计提供参考。
Taking direct absorption solar thermochemical reactor as the research object,numerical simulation and UDF(user-defined function)is used to study how reactor efficiency changed at different focus position.For evaluating methane decomposition in solar reactor,some contours have been drawn and two efficiencies including reaction conversion rate and chemical energy storage efficiency have been calculated.It shows that the best efficiency can be achieved when beam direction is perpendicular to the incident surface on the reactor.The reaction conversion rate and thermochemical energy storage efficiency increase obviously when the angle between incident rays induces from 90°to 53°.In particular,when the position of focus is greater than 70 mm,the change of efficiency is not obvious with position moving forward.The length should be appropriate for the reactor.This work can provide a reference for the design of direct absorption solar thermochemical reactors and solar concentrators.
作者
孙全
朱群志
张涛
段芮
Sun Quan;Zhu Qunzhi;Zhang Tao;Duan Rui(College of Energy and Mechanical Engineering,Shanghai University of Electric Power,Shanghai 200090,China)
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2021年第4期299-306,共8页
Acta Energiae Solaris Sinica
基金
国家自然科学基金(51576119)。
关键词
太阳能
热化学反应
辐射换热
反应器
焦点位置
甲烷裂解
solar energy
thermochemistry
radiative transfer
reactor
focus position
methane decomposition
