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A New Approach for Mitigating Biofouling by Promoting Online Cleaning Using a Sacrificial Paraffin Coating

机译：通过使用牺牲石蜡涂层促进在线清洁来减轻生物污染的新方法

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摘要

The presence of biofouling layers on heat transfer surfaces can reduce heat transfer efficiency markedly. A new method for inhibiting biofouling growth and promoting rapid online cleaning for heat exchangers recovering thermal energy from treated sewage streams based on a temporary coating is reported. A paraffin wax coating is cast in place without needing to disassemble the device, while the low roughness and the hydrophobicity of the coating inhibit bacterial growth. The coating and any attached biofouling can be removed by raising the surface temperature above the wax melting point. The effectiveness of this online cleaning and inhibition strategy was investigated using a simple laboratory test channel, representing a plate heat exchanger, and a process stream simulating treated sewage. The thermal resistance was monitored and showed that the reduction in biofouling thermal resistance eventually outweighed the additional thermal resistance resulting from the coating. A techno-economic analysis is presented to quantify the advantages of the paraffin coating method in terms of energy saving and cost reduction.
机译：传热表面上生物污垢层的存在会显着降低传热效率。据报道，一种新的方法可以抑制生物积垢的生长并促进热交换器的在线快速清洁，该方法可以基于临时涂层从处理过的污水流中回收热能。石蜡涂层被浇铸到位而无需拆卸设备，而涂层的低粗糙度和疏水性抑制了细菌的生长。可以通过将表面温度提高到蜡熔点以上来去除涂层和任何附着的生物污垢。使用代表板式热交换器的简单实验室测试通道和模拟处理后的污水的工艺流，研究了这种在线清洁和抑制策略的有效性。监测热阻并显示出生物污损热阻的降低最终超过了由涂层产生的附加热阻。提出了一项技术经济分析，以量化石蜡包衣方法在节能和降低成本方面的优势。

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  • 来源
    《Heat Transfer Engineering》 |2015年第8期|695-705|共11页
  • 作者

    QIANPENG YANG; D. IAN WILSON; SIYUAN CHANG; LIN SHI;

  • 作者单位

    Department of Thermal Engineering, Tsinghua University, Beijing, China;

    Department of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge, United Kingdom;

    Department of Thermal Engineering, Tsinghua University, Beijing, China;

    Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Thermal Engineering, Tsinghua University, Beijing 100084, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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