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首页> 外文会议>ASME Power Conference 2005: Includes Papers from the 2005 International Conference on Power Engineering(ICOPE) pt.A >DEVELOPMENT OF A CFD-BASED COAL PIPE DESIGN TOOL
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DEVELOPMENT OF A CFD-BASED COAL PIPE DESIGN TOOL

机译：基于CFD的煤管设计工具的开发

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摘要

In a coal-fired power plant, pulverized coal, using air as a transport medium, is pneumatically transported toward different burner nozzles by splitting the large pipe into small pipes through bifurcators or trifurcators. The combustion efficiency of the burner is dependent on matching the air and coal in these pipes. Increasingly tight emission standards also make the balance of air and coal a very critical factor for the success of the power plant. Coal roping occurs when the gas-solid flow passes through a curved pipe. The momentum of the particles carries them to the outside of the wall, concentrating in a small region. Therefore, the particle concentration in this small region is much higher than the other part of the pipe cross-section. Coal roping upstream of a coal distributor (bifurcator) can create a significant imbalance in coal loading in the split between the two branches. This can significantly impact plant performance and increase NOx production. Previous research has shown that coal rope characteristics depend on many parameters; the geometry (i.e., elbow radius of curvature-to-pipe diameter ratio, pipe orientation, orifice opening, and the locations of orifices) of the coal pipe, which is determined at the design stage, will strongly affect the coal distribution in the outlet of coal pipes. This characteristic of coal roping indicates that optimizing the pipe geometry may be helpful in getting a more uniform coal distribution at the pipe's outlet cross-section and minimizing the problems caused by imbalance between burners. In this paper, we present the CFD-based coal pipeline design tool to achieve the evenly distributed coal particle distribution across the pipe cross-section.
机译：在燃煤发电厂中，使用空气作为输送介质的煤粉通过将大型管道通过叉车或三叉车分成小管道而气动地朝着不同的燃烧器喷嘴输送。燃烧器的燃烧效率取决于这些管道中的空气和煤是否匹配。日益严格的排放标准也使空气和煤的平衡成为电厂成功的非常关键的因素。当气固流通过弯曲的管子时，煤就会结扎。粒子的动量将它们带到壁的外部，集中在一个很小的区域。因此，在这个小区域中的颗粒浓度远高于管道横截面的其他部分。在两个分支机构之间的分支中，煤炭在配煤器（分叉器）上游的绳索缠绕会造成煤炭负荷的严重失衡。这会严重影响工厂性能并增加NOx的产生。先前的研究表明，煤绳的特性取决于许多参数。在设计阶段确定的煤管的几何形状（即弯头曲率半径与管径之比，管的方向，孔口的开口以及孔口的位置）将严重影响出口处的煤分布煤管。煤条的这种特性表明，优化管道的几何形状可能有助于在管道出口横截面处获得更均匀的煤分布，并最大程度地减少由燃烧器之间的不平衡引起的问题。在本文中，我们介绍了基于CFD的煤炭管道设计工具，以实现整个管道横截面内煤颗粒的均匀分布。

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