| 弱旋湍流火焰合成纳米二氧化钛的机理研究 | |
| 马斌 ; 李水清 ; 蔡子嘉 ; 姚强 ; MA Bin ; LI Shui-Qing ; CAI Zi-Jia ; YAO Qiang | |
| 2010-05-13 ; 2010-05-13 | |
| 关键词 | 弱旋湍流火焰 火焰合成 纳米颗粒 二氧化钛 low swirl turbulent flame flame synthesis nano-particles Titanium dioxides TK16 |
| 其他题名 | SYNTHESIS OF TIO_2 NANO-PARTICLES IN LOW-SWIRL TURBULENT PREMIXED FLAMES |
| 中文摘要 | 湍流效应在火焰合成纳米TiO_2颗粒工业化规模放大中具有重要影响。本文基于一种内加环形旋流片的弱旋火焰开展了合成TiO_2纳米颗粒的实验研究。对于内径12 mm管式燃烧器,加入旋片后火焰贫燃极限大幅度降低16%～33%,火焰高度也从9.0 cm减少到3.0 cm,焰区温度约减少20%～30%。研究表明,弱旋湍流火焰具有流速大、可燃当量比低和温度低的特点,使其相对无旋火焰可以合成粒径较小、烧结程度较低的TiO_2纳米颗粒。; Turbulence effect plays an important role in the scale-up and industrialization of flame aerosol processes,since most of lab-scale burners for flame synthesis of nano-particle operate in the laminar zone such as co-flow burner,flat-flame burner and counter-flow burner.In this paper,a low swirl burner (LSB) was firstly developed for the flame synthesis of TiO_2 nano-particles.The swirler section is comprised of an annular vane section along the inside wall of the tubular burner (i.d.12 ram) and a central bypass into a smaller vertical tube with a perforated screen.The LSB can access a remarkably wide range of stable operating conditions,which reduces the lean flammability limit by 16%～33% compared to the normal Bunsen flame without the swirler.The flame height and the temperature of low-swirl turbulent flame are both decreased.TEM results indicate that,the size of TiO_2 particle from low-swirl flame is about 20 nm and less aggregated,while that from Bunsen flame without the swirler is about 50 nm and more aggregated. |
| 语种 | 中文 ; 中文 |
| 内容类型 | 期刊论文 |
| 源URL | [http://hdl.handle.net/123456789/31518]  |
| 专题 | 清华大学 |
| 推荐引用方式 GB/T 7714 | 马斌,李水清,蔡子嘉,等. 弱旋湍流火焰合成纳米二氧化钛的机理研究[J],2010, 2010. |
| APA | 马斌.,李水清.,蔡子嘉.,姚强.,MA Bin.,...&YAO Qiang.(2010).弱旋湍流火焰合成纳米二氧化钛的机理研究.. |
| MLA | 马斌,et al."弱旋湍流火焰合成纳米二氧化钛的机理研究".(2010). |
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