Yang Qianpeng, Chang Siyuan, Shi Lin
a Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Thermal Engineering , Tsinghua University , Beijing 100084 , People's Republic of China.
Environ Technol. 2015;36(21):2778-85. doi: 10.1080/09593330.2015.1049211. Epub 2015 Jun 3.
Heat exchangers used for treated sewage energy recovery usually suffer from the composite fouling problem, which seriously impairs the heat transfer efficiency. Treated sewage heat exchanger composite fouling is mostly composed of biofouling and is notably affected by interactions between the biofouling and suspended matter. Experiments were performed using simulated treated sewage and two kinds of simulated suspended matter, silicon dioxide particles and polyamide filaments, to model the interactions. Different flow velocities, particle sizes and concentrations were tested with their influences presented by the fouling wet weight changes. Empirical equation and threshold were developed based on the results to predict whether the suspended matter promotes or impedes fouling growth. The results indicate that proper control of the flow velocities, particle sizes and concentrations of suspended matter using empirical equation and threshold can inhibit fouling by reducing unwanted positive interactions and promoting beneficial negative interactions. The filament interactions were analysed and the unique attachment mechanisms of filaments were discussed for the first time.
用于处理后污水能量回收的热交换器通常会遭遇复合污垢问题，这严重损害了传热效率。处理后污水热交换器的复合污垢大多由生物污垢组成，并且显著受到生物污垢与悬浮物之间相互作用的影响。使用模拟处理后污水以及两种模拟悬浮物——二氧化硅颗粒和聚酰胺长丝进行了实验，以模拟这些相互作用。测试了不同的流速、颗粒尺寸和浓度，并通过污垢湿重变化呈现其影响。基于实验结果建立了经验方程和阈值，以预测悬浮物是促进还是阻碍污垢生长。结果表明，利用经验方程和阈值适当控制悬浮物的流速、颗粒尺寸和浓度，可以通过减少不必要的正向相互作用并促进有益的负向相互作用来抑制污垢。首次分析了长丝之间的相互作用，并讨论了长丝独特的附着机制。
