摘要
为了研究多孔介质结构特征对燃烧强化作用的影响,在孔隙率和孔径基础上,引入新的结构参数弯曲度表征多孔介质的形貌结构特性,并对不同结构参数条件下多孔介质中低热值H_(2)/CO混合气的燃烧稳定性开展实验研究。结果表明,多孔介质可提高稳燃上限,拓宽贫燃极限并降低污染物排放。与孔隙率和孔径对燃烧稳定性的非单调影响特性不同,实验中弯曲度对燃烧稳定性的影响呈单调变化趋势,高弯曲度结构具有更强的燃烧增强效果。通过优化结构参数,可以扩大多孔介质燃烧的稳燃范围。此外,三个结构参数针对不同的燃烧状态也表现出不同的影响,对于高功率密度燃烧,采用高孔隙率结构可以实现更低的CO排放,对于极贫燃燃烧则应采用高弯曲度、低孔隙率的结构。
To investigate the impact of the porous media structural characteristics on combustion enhancement,a new structural parameter tortuosity was introduced on the basis of porosity and pore size to characterize the structural properties of porous media,porosity and pore size.Experimental studies were conducted to explore the combustion stability of low calorific value H_(2)/CO mixture within porous media under varying structural parameter conditions.The results show that porous media can improve the upper limit of stable combustion,broaden the lean combustion limit and reduce pollutant emissions.In contrast to the non-monotonic influence exhibited by porosity and pore size on combustion stability,the effect of tortuosity on combustion stability in the experiment shows a monotonic change trend,and the high tortuosity structure has a stronger combustion enhancement effect.By optimizing the structural parameters,the flame stability in porous media can be significantly improved.Additionally,the three structural parameters exhibit different impacts depending on the combustion states.In scenarios involving high power density combustion,a structure with high porosity contributes to the reduction of CO emissions,whereas for ultra-lean combustion,a structure with high tortuosity and low porosity is recommended.
作者
李亮
张扬
张海
LI Liang;ZHANG Yang;ZHANG Hai(Department of Energy and Power Engineering,Tsinghua University,Key Laboratory for Thermal Science and Power Engineering of Ministry of Education,Beijing 100084,China;Shanxi Research Institute for Clean Energy,Tsinghua University,Taiyuan 030032,Shanxi,China)
出处
《化工学报》
2025年第10期5351-5361,共11页
CIESC Journal
基金
国家自然科学基金项目(52176116)
华能集团总部科技项目基础能源科技研究专项(三)((HNKJ22-H105)-U22YYJC11)。
关键词
多孔介质燃烧
多孔介质形貌
弯曲度
低热值气体
porous media combustion
porous morphology
tortuosity
low calorific syngas
作者简介
通信作者:张海(1967—),男,博士,教授,haizhang@mail.tsinghua.edu.cn;第一作者:李亮(1997—),男,博士研究生,ll20@mails.tsinghua.edu.cn。
