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HYBRID HEAT EXCHANGERS

机译：混合换热器

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Whetherfor cooling, heating, condensing or evaporating, heat exchangers are a vital component in a variety of industrial processes. Their role in applying or recovering costly thermal energy from process gases or liquids means that the efficiency of heat exchangers impacts directly on energy use and therefore on the operating costs and environmental performance of a plant or process. As energy costs rise and the environmental footprint of industrial processes is increasingly in the spotlight, heat exchanger technology is also evolving to respond to new, more demanding criteria. For more than 100 years, the classic shell-and-tube heat exchanger has been the solution for many applications, especially those involving solids or contaminants, but its efficiency is limited. Plate-and-frame heat exchangers, first developed by Dr. Richard Seligman of APV in 1923, offer higher heat transfer efficiency and cost effectiveness combined with low downtime and relatively small size and weight, thus reducing installed space requirements. The major contributor to the higher efficiency of plate-and-frame heat exchangers is the plate corrugation pattern in combination with a relatively narrow gap between the heat transfer plates. However, the fluids being handled must be relatively clean because the plates have limitations when solids or other contaminants are involved. In addition, the gaskets, which traditionally provide the seal between plates, limit the operating pressures and temperatures to typically 300 psig (20 bar) and 400℉ (200℃), respectively.
机译：无论对于冷却，加热，冷凝还是蒸发，热交换器都是许多工业过程中的重要组成部分。它们在从工艺气体或液体中应用或回收昂贵的热能的作用意味着，热交换器的效率直接影响能源使用，进而影响工厂或过程的运营成本和环境绩效。随着能源成本的上升以及工业流程对环境的影响日益受到关注，换热器技术也在不断发展，以响应新的，更高要求的标准。一百多年来，经典的管壳式换热器已成为许多应用的解决方案，尤其是那些涉及固体或污染物的应用，但其效率受到限制。板框式换热器由APV的Richard Seligman博士于1923年首先开发，具有更高的传热效率和成本效益，同时停机时间短，尺寸和重量相对较小，从而减少了安装空间需求。板框式换热器效率更高的主要原因是板的波纹形式以及传热板之间相对较窄的间隙。但是，要处理的流体必须相对清洁，因为当涉及固体或其他污染物时，板子会受到限制。另外，传统上在板之间提供密封的垫圈将操作压力和温度分别限制在300 psig（20 bar）和400℉（200℃）。

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  • 来源
    《Process Heating》 |2014年第3appa期|34-36|共3页
  • 作者

    Carl T. Kozacki;

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