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Particle history from massively parallel large eddy simulations of pulverised coal combustion in a large-scale laboratory furnace

机译：大型实验室炉中粉煤燃烧大型平行大型涡流模拟的颗粒史

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摘要

A study on the coal particle history during combustion in a large-scale furnace using large eddy simulation is presented. The massively parallel execution produces a high-resolution representation of the fluid mixing and particle dispersion throughout the whole computational domain. The coal combustion is modelled using wellestablished, cost-effective combustion models. A specific feature of the devolatilization model is the optimisation of the kinetic constants for the furnace operating condition, which were obtained through an iterative procedure between particle heating rates from full large eddy simulation runs and the advanced model Chemical Percolation Devolatilization. In a previous work, we showed that the classical coal combustion models, when used in a high-resolution massively parallel large eddy simulation, lead to satisfactory predictions of the in-flame gas properties, namely gas temperature and gas species concentrations. In this work, we went beyond the comparisons between gas phase measurements and predictions. Single particles were tracked over time and instantaneous ensambles were collected to obtain a better understanding of the conditions that coal particles are subjected to in the investigated test case. The particles trajectory, combustion history and instantaneous state distribution were analysed. The volatile flame features were related with the characteristic trajectory of different sized particles. The combustion history revealed that particles are subjected to large variations of heating rates, including very short sequential periods alternating between heating and cooling during the early stages of combustion, due to the high turbulence intensity in the near burner region. Finally, the state distribution of the ensamble provided a global picture of the instantaneous coal combustion process.
机译：介绍了大型涡流模拟中大型炉中燃烧过程中煤颗粒史的研究。大规模并行执行在整个计算结构域中产生流体混合和颗粒分散的高分辨率表示。煤燃烧采用合成，经济效益的燃烧模型进行了建模。脱挥石模型的特定特征是炉操作条件的动力学常数优化，这是通过粒子加热率之间的迭代过程获得的，从全大型涡流仿真运行和先进的模型化学渗透脱挥发化。在以前的工作中，我们表明，在高分辨率大平行大涡模拟中使用的古典煤燃烧模型导致对火焰气体特性的令人满意的预测，即气体温度和气体物种浓度。在这项工作中，我们超越了气相测量和预测之间的比较。随着时间的推移跟踪单个颗粒，收集瞬时基因，以更好地理解在研究的测试用例中进行煤颗粒的条件。分析了颗粒轨迹，燃烧历史和瞬时状态分布。挥发性火焰特征与不同尺寸颗粒的特征轨迹有关。燃烧历史表明，由于近燃烧器区域中的高湍流强度，颗粒经受大量加热速率的大量加热速率变化，包括在燃烧的早期阶段期间的加热和冷却之间交替的非常短的顺序。最后，Ensamble的状态分布提供了瞬时煤燃烧过程的全球图像。

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  • 来源
    《Fuel》 |2020年第jul1期|117587.1-117587.12|共12页
  • 作者

    Rabacal Miriam; Costa Mario; Rieth Martin; Kempf Andreas M.;

  • 作者单位

    Univ Lisbon Inst Super Tecn Mech Engn Dept IDMEC Lisbon Portugal|Swiss Fed Inst Technol Aerothermochem & Combust Syst Lab Zurich Switzerland;

    Univ Lisbon Inst Super Tecn Mech Engn Dept IDMEC Lisbon Portugal;

    Univ Duisburg Essen Inst Combust & Gas Dynam Chair Fluid Dynam Duisburg Germany|Sandia Natl Labs Livermore CA 94550 USA;

    Univ Duisburg Essen Inst Combust & Gas Dynam Chair Fluid Dynam Duisburg Germany;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Large eddy simulation; Massively parallel execution; Large-scale coal combustion; Coal particle history; Particle state;

    机译：大涡模拟;大规模平行执行;大规模的煤燃烧;煤粒子历史;粒子状态;

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