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首页> 外文会议>International conference on heat exchanger fouling and cleaning: challenges and opportunities; 20070701-06; Tomar(PT) >HITRAN~? WIRE MATRIX INSERTS IN FOULING APPLICATIONS
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HITRAN~? WIRE MATRIX INSERTS IN FOULING APPLICATIONS

机译：希特兰〜？电线电缆插入在故障处理中的应用

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摘要

Fouling characteristics are dictated largely by the properties of the thermal and hydrodynamic boundary layers. As a result, fouling mitigation strategies must take into account the conditions in this region. hiTRAN~? wire matrix tube inserts are a useful tool in altering the conditions near the tube wall, especially in the laminar and transition flow regions. This review paper considers Particle Image Velocimetry (PIV) and Laser Doppler Velocimetry (LDV) measurements, which were employed in order to show the hydrodynamic differences between plain tubes and those containing inserts. Measurements indicate that the wall shear rate in tubes containing hiTRAN~? inserts operating in the laminar flow regime is similar to that for plain bore tubes operating in the turbulent flow regime. Moreover, the increased tube side heat transfer coefficient which results from the reduction of the thermal boundary layer allows operation with smaller EMTDs. This enables the designer to reduce the tube wall temperature to a level below the fouling threshold temperature, e.g. to combat crude oil fouling. The results from the laser analyses into the hydrodynamic boundary layer are backed up by recent research data investigating the effect of hiTRAN~? inserts on sedimentation and particulate fouling. The thickness of the fouling layer was measured by applying a combination of photographic and laser measurement techniques. The results are compared to plain tube data and are reported as a function of both flow rate and hiTRAN~? insert packing density. The impact of altering the hydrodynamic and thermal conditions near to the wall is subsequently demonstrated for different fouling mechanisms. Studies of the impact of hiTRAN~? inserts on biological and chemical reaction fouling in crude oil processing are also reviewed. A better understanding of the threshold shear rates and wall temperatures for different fouling mechanisms is required for any study into the impact of fouling. Combining this knowledge with the principles outlined in this paper clearly emphasises the benefit of using hiTRAN~? wire matrix inserts as a powerful tool to mitigate fouling.
机译：结垢特性主要由热和流体动力边界层的特性决定。结果，结垢缓解策略必须考虑该地区的情况。 hiTRAN〜？线基管插入物是改变管壁附近条件的有用工具，特别是在层流和过渡流动区域。这篇评论论文考虑了粒子图像测速（PIV）和激光多普勒测速（LDV）测量，它们的使用是为了显示普通管与包含嵌件的管之间的流体力学差异。测量表明，含有hiTRAN〜？的试管中的壁剪切速率。在层流状态下工作的插入件与在湍流状态下工作的普通管类似。而且，由于热边界层的减少而导致的增加的管侧传热系数允许以较小的EMTD运行。这使设计人员能够将管壁温度降低到结垢阈值温度以下的水平，例如，打击原油污染。激光分析进入流体动力边界层的结果得到了研究hiTRAN〜？效果的最新研究数据的支持。插入沉淀和颗粒结垢。通过应用照相和激光测量技术的组合来测量结垢层的厚度。将结果与普通管数据进行比较，并报告为流速和hiTRAN_？的函数。插入包装密度。随后针对不同的结垢机理证明了改变壁附近的流体动力和热条件的影响。研究hiTRAN〜？还对原油加工过程中生化反应结垢的文章进行了综述。对于结垢影响的任何研究都需要对不同结垢机理的阈值剪切速率和壁温有更好的了解。将此知识与本文概述的原理相结合，显然会强调使用hiTRAN〜？的好处。线材插入物是减轻结垢的有力工具。

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