Resolved simulations of single char particle combustion in a laminar flow field
Resolved simulations of single char particle combustion in a laminar flow field
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DOI：
10.1016/j.fuel.2016.11.011
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发表时间：
2017-08
期刊：
影响因子：
7.4
通讯作者：
Sima Farazi;M. Sadr;Seongwon Kang;M. Schiemann;N. Vorobiev;V. Scherer;H. Pitsch
中科院分区：
文献类型：
--
作者：
Sima Farazi;M. Sadr;Seongwon Kang;M. Schiemann;N. Vorobiev;V. Scherer;H. Pitsch
这项工作的目的是研究空间和化学分解的颗粒燃烧情况，以了解化学和层流传输过程，并支持模型开发。在本研究中，研究了位于空气或由氧气、二氧化碳和蒸汽组成的含氧燃料气氛中的单个炭颗粒的燃烧过程。在高分辨率的数值模拟中，包括对表面和气相化学的详细描述，代表了炭烧烬。在固气界面，考虑了碳氧化和气化等表面反应引起的热和质量通量。通过对平焰燃烧器中焦炭燃尽阶段的实验验证了该模型的正确性。我们通过改变颗粒大小、相对速度、稀释剂和周围气体中的氧成分，进行了一套全面的全分辨反应性二维模拟。讨论了大气co2和n2含量的模拟结果，突出了全氧燃料燃烧的影响。此外，通过改变颗粒大小和相对滑移速度的相对雷诺数，研究了颗粒流运动对颗粒周围形成的火焰的影响。
The aim of this work is to study spatially and chemically resolved particle combustion cases to understand chemical and laminar transport processes and to support model development. In the present study, the combustion process of a single char particle located in air or oxy-fuel atmosphere composed of oxygen, carbon dioxide, and steam is investigated. Char burnout is represented in highly resolved numerical simulations including a detailed description of the surface and the gas phase chemistry. At the solid-gas interface, heat and mass fluxes due to the surface reactions involving carbon oxidation and gasification are considered. The model is validated based on experimental results for char burnout phase in a flat flame burner. We perform a comprehensive set of fully resolved reactive 2-D simulations by varying particle size, relative velocity, diluent, and oxygen composition in the surrounding gas. The simulation results are discussed regarding the CO 2 and N 2 content of the atmosphere highlighting the effects of oxy-fuel combustion. Furthermore, the impact of the particle flow motion on the flame that forms around the char particle is investigated by varying relative Reynolds number with particle size and relative slip velocity.