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Utilizing CFD as an Efficient Tool for Improved Equipment Design

机译:利用CFD作为改进设备设计的有效工具

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This paper presents a case study of a heat recovery system in an incinerator of waste sludge from a pulp mill. The aim of this study is to find an optimized design of additional measures to be installed in the exhaust duct of the incinerator to help prevent fouling in a connected heat exchanger. A Computational Fluid Dynamics (CFD) approach is a natural choice for this application as no experimental evaluation of the proposed solutions can be performed. Input data are obtained from the process using simpler, balance-based approaches. CFD analysis is first used to determine what causes the fouling and then optimize the duct design in order to eliminate the undesirable phenomena. Several solution alternatives are proposed consisting of sets of vanes with different geometries. The finite volume model employed in the computations is described, and the adopted approach, assumptions, and simplifications are discussed. The studied alternatives are evaluated and the best of them is found using a flow uniformity index based on velocity distribution in a reference cross-section. It is concluded that the insight gained by CFD analysis is decisive for arriving at an improved design in this application.
机译:本文介绍了一个纸浆厂废渣焚烧炉中热回收系统的案例研究。这项研究的目的是找到在焚化炉排气管中安装的其他措施的优化设计,以帮助防止所连接的热交换器结垢。计算流体动力学(CFD)方法是此应用程序的自然选择,因为无法对提出的解决方案进行实验评估。使用更简单的基于余额的方法从过程中获取输入数据。 CFD分析首先用于确定引起结垢的原因,然后优化管道设计以消除不良现象。提出了几种解决方案,包括具有不同几何形状的叶片组。描述了计算中使用的有限体积模型,并讨论了采用的方法,假设和简化。对所研究的替代方案进行评估,并根据参考截面中的速度分布使用流量均匀性指数来找到最佳方案。结论是,通过CFD分析获得的见解对于在此应用中获得改进的设计具有决定性的作用。

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