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首页> 外文会议>Clearwater clean coal conference;International technical conference on clean energy >Predicting Particle Deposition Temperature for Flow Over a Boiler Tube in Combustion Environments
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Predicting Particle Deposition Temperature for Flow Over a Boiler Tube in Combustion Environments

机译：预测燃烧环境中流经锅炉管的颗粒沉积温度

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摘要

Particle deposition on heat exchanger tubes is a serious concern in solid fuel combustion and gasification systems, such as power plants and syngas coolers. In order to predict deposition rates, which affect heat transfer efficiencies, several detailed computational fluid dynamic (CFD) models have been developed. However, these models are computationally expensive and cannot be used for quick determination of deposition and/or slagging tendencies. On the other hand, particle impaction efficiency correlations have been developed. While not as accurate as the detailed models, they are easier to use and indicate the impaction of particles on the heat exchanger tubes. However, since deposition and slagging are not just functions of particle impaction rates, but also their sticking propensity, which is related to the particle temperature at impact, the impaction efficiency correlations fail to provide sufficient information. In this work, similar correlations for particle temperature at impact have been developed, based on a non-dimensional parameter that captures the flow and boundary conditions, as well as particle properties. When used alongside the impaction efficiency correlations, the new correlations developed here can provide a reasonable estimate of the deposition and slagging tendencies, at negligible computational expense.
机译：在固体燃料燃烧和气化系统（例如发电厂和合成气冷却器）中，热交换器管上的颗粒沉积是一个严重的问题。为了预测影响传热效率的沉积速率，已经开发了几种详细的计算流体动力学（CFD）模型。然而，这些模型在计算上是昂贵的，并且不能用于快速确定沉积和/或排渣趋势。另一方面，已经开发了粒子碰撞效率相关性。尽管不如详细模型精确，但它们更易于使用，并表明颗粒在热交换器管上的撞击。但是，由于沉积和成渣不仅是颗粒撞击率的函数，而且还是它们的粘附倾向，这与撞击时的颗粒温度有关，因此撞击效率的相关性不能提供足够的信息。在这项工作中，基于捕获流动和边界条件以及粒子特性的无量纲参数，已经开发了与撞击时的粒子温度相似的相关性。与冲击效率相关性一起使用时，此处开发的新相关性可以以可忽略的计算费用提供沉积趋势和结渣趋势的合理估计。

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