Two-dimensional modelling of deposits formation on platen superheaters in pulverized coal boilers
Two-dimensional modelling of deposits formation on platen superheaters in pulverized coal boilers
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DOI：
10.1016/j.fuel.2009.02.023
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发表时间：
2009-08
期刊：
影响因子：
7.4
通讯作者：
J. Tomeczek;K. Wacławiak
中科院分区：
文献类型：
--
作者：
J. Tomeczek;K. Wacławiak
一维沉积物形成模型不能很好地描述锅炉传热管附近气体和颗粒的流动。特别是，回流区在下游侧的管是不可能重现的一维模型。已知的应用程序的计算流体动力学代码的沉积建模是能够复制的表面上的颗粒沉积的速率，而实际的原因，最重要的信息是沉积物的形状和大小，因为它能够预测的传热减少与锅炉运行时间。本文介绍了煤粉锅炉屏式过热器沉积物的二维模拟。特别地，在工业锅炉中观察到的管间距的桥接再现的模型，其中提出的灰粘附概率的颗粒尺寸依赖。结果表明，灰粒尺寸在沉积物生长机理中起着重要作用。
The 1D modeling of deposits formation is not able to describe properly the gas and particles flow in the vicinity of heat transfer tubes in boilers. Especially, the recirculation zones in the down-stream side of tubes are not possible to reproduce by the 1D models. Known applications of the CFD codes to deposition modelling were able to reproduce only the rate of particles deposition on surfaces, while for practical reasons the most important information is the shape and size of deposits, because it enables prediction of heat transfer abatement with boiler operation time. Paper presents 2D modelling of deposits on platen superheaters in pulverized coal boilers. Particularly, the observed in industrial boilers bridging of the tubes spacing was reproduced by the model in which the particle size dependence of the ash sticking probability was proposed. It has been demonstrated that the ash particles size play important role in the deposits growth mechanism.