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首页> 外文期刊>Energies >Assessment against Experiments of Devolatilization and Char Burnout Models for the Simulation of an Aerodynamically Staged Swirled Low-NO x Pulverized Coal Burner
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Assessment against Experiments of Devolatilization and Char Burnout Models for the Simulation of an Aerodynamically Staged Swirled Low-NO x Pulverized Coal Burner

机译：空气动力学分级旋流式低NOx煤粉燃烧器模拟的脱挥发分和炭烧尽模型的实验评估

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In the next few years, even though there will be a continuous growth of renewables and a loss of the share of fossil fuel, energy production will still be strongly dependent on fossil fuels. It is expected that coal will continue to play an important role as a primary energy source in the next few decades due to its lower cost and higher availability with respect to other fossil fuels. However, in order to improve the sustainability of energy production from fossil fuels, in terms of pollutant emissions and energy efficiency, the development of advanced investigation tools is crucial. In particular, computational fluid dynamics (CFD) simulations are needed in order to support the design process of low emission burners. Even if in the literature several combustion models can be found, the assessment of their performance against detailed experimental measurements on full-scale pulverized coal burners is lacking. In this paper, the numerical simulation of a full-scale low-NO x , aerodynamically-staged, pulverized coal burner for electric utilities tested in the 48 MW th plant at the Combustion Environment Research Centre (CCA - Centro Combustione e Ambiente) of Ansaldo Caldaie S.p.A. in Gioia del Colle (Italy) is presented. In particular, this paper is focused on both devolatilization and char burnout models. The parameters of each model have been set according to the coal characteristics without any tuning based on the experimental data. Thanks to a detailed description of the complex geometry of the actual industrial burner and, in particular, of the pulverized coal inlet distribution (considering the entire primary air duct, in order to avoid any unrealistic assumption), a correct selection of both devolatilization and char burnout models and a selection of suited parameters for the NO x modeling, accurate results have been obtained in terms of NO x formation. Since the model parameters have been evaluated a priori, the numerical approach proposed here could be suitable to be applied as a performance prediction tool in the design of pulverized coal burners.
机译：在未来几年中，即使可再生能源将持续增长且化石燃料的份额将减少，但能源生产仍将严重依赖化石燃料。预计在未来的几十年中，煤炭将继续作为主要能源发挥重要作用，因为与其他化石燃料相比，煤炭的成本更低且可用性更高。但是，为了提高化石燃料能源生产的可持续性，就污染物排放和能源效率而言，开发先进的调查工具至关重要。特别是，需要计算流体动力学（CFD）仿真，以支持低排放燃烧器的设计过程。即使在文献中可以找到几种燃烧模型，也缺乏针对全尺寸煤粉燃烧器的详细实验测量来评估其性能的评估。本文在Ansaldo燃烧环境研究中心（CCA-Centro Combustione e Ambiente）的48 MW工厂进行了全尺寸低NOx空气动力学分级粉煤燃烧器的数值模拟，该燃烧器用于电力公司介绍了Gioia del Colle（意大利）的Caldaie SpA。特别是，本文主要关注脱挥发分和炭烧尽模型。每个模型的参数都是根据煤的特性设置的，无需根据实验数据进行任何调整。由于详细描述了实际工业燃烧器的复杂几何形状，尤其是粉煤入口分布（为避免任何不切实际的假设，考虑了整个一次风道），因此需要对脱挥发分和焦炭进行正确选择燃尽模型以及为NO x建模选择合适的参数后，就NO x的形成获得了准确的结果。由于已经对模型参数进行了先验评估，因此本文提出的数值方法可能适合用作粉煤燃烧器设计中的性能预测工具。

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