Effects of swirling combustion on soot characteristics in 2,5-dimethylfuran/n-heptane diffusion flames
Effects of swirling combustion on soot characteristics in 2,5-dimethylfuran/n-heptane diffusion flames
复制标题
旋流燃烧对2,5-二甲基呋喃/正庚烷扩散火焰中烟尘特性的影响
DOI：
10.1016/j.applthermaleng.2018.04.049
复制
发表时间：
2018-07
影响因子：
6.4
通讯作者：
Liu Dong
中科院分区：
文献类型：
--
作者：
Jia Penghui;Ying Yaoyao;Luo Minye;Jiang Bo;Liu Dong
发动机和锅炉燃烧产生的烟尘颗粒严重威胁着人类的健康。本文研究了2，5-二甲基呋喃（DMF）/正庚烷非旋流和旋流火焰中碳烟颗粒的纳米结构和氧化反应性。采用高分辨透射电镜（HRTEM）、X射线衍射（XRD）和热重分析（TGA）研究了不同DMF/正庚烷混合比条件下，旋流和收集时间对碳烟颗粒纳米结构和氧化反应性的影响。结果表明，50%正庚烷/50%DMF火焰的碳烟为典型的核壳结构，具有较大的平面层，而纯庚烷和80%正庚烷/20%DMF火焰的碳烟为部分石墨化和部分非晶化结构。旋流燃烧可以增强氧化剂流和燃料流的混合性，减少掺加20%和50%DMF火焰中活性碳烟颗粒的存在。纯庚烷旋流火焰由于减少了停留时间，收集了更多的活性碳烟颗粒。收集时间对纯庚烷和80%正庚烷/20%DMF火焰中的烟灰颗粒影响不显着。而对于50%正庚烷/50%DMF火焰中的碳烟颗粒，由于收集过程中提供了氧化性气氛，碳烟颗粒的石墨化度随着收集时间的增加而明显增加。
Soot particles emitted from the combustion of engines and furnaces threaten human health gravely. The present work focuses on the nanostructure and oxidation reactivity of soot particles formed from 2,5-dimethylfuran (DMF)/n-heptane non-swirling and swirling flames. Effects of swirling and collection time on the nanostructure and oxidation reactivity of soot particles under the conditions of different 2,5-dimethylfuran (DMF)/n-heptane blending ratios were investigated in details using the high resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), and thermogravimetric analysis (TGA). Results demonstrated that soot from 50%n-heptane/50% DMF flame presented a typical core–shell structure with larger planar lamellae, while partly graphitic and partly amorphous structures were found in soot from puren-heptane and 80%n-heptane/20% DMF flames. Swirling combustion could strengthen the mixability of the oxidizer stream and fuel stream, decreasing the existence of reactive soot particles from the flames doped with 20% and 50% DMF. More reactive soot particles were collected by puren-heptane swirling flame due to the reduction of residence time. The effect of collection time was non-significant on soot particles from puren-heptane and 80%n-heptane/20% DMF flames. However, for soot particles from the 50%n-heptane/50% DMF flames, the graphitization degree was increased obviously with the increase of collection time due to the oxidizing atmosphere provided during the collecting process.
登录
查看更多内容
DOI：
10.1016/j.ijthermalsci.2016.06.015
发表时间：
2016-11-01
影响因子：
4.5
作者：
Kotb, Ashraf;Saad, Hany
通讯作者：
Saad, Hany
影响因子：
7.4
作者：
Alumah Arad;E. Sher;G. Enden
通讯作者：
Alumah Arad;E. Sher;G. Enden
乙烯/戊醇火焰中初生烟灰颗粒的纳米结构和氧化反应性
影响因子：
3.2
作者：
Dong Liu;Bo Jiang;Pengfei Wang;Wei Wang
通讯作者：
Wei Wang
影响因子：
6.4
作者：
B. Rohani;C. Bae
通讯作者：
B. Rohani;C. Bae
影响因子：
6.4
作者：
Yangbo Deng;Hongwei Wu;F. Su
通讯作者：
Yangbo Deng;Hongwei Wu;F. Su