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城镇二级出水热能回用过程中换热表面产生微生物污垢与颗粒污垢等共生的混合污垢。为分析无机颗粒对微生物污垢形成过程影响,以可控微生物种类及浓度和无机颗粒含量的模拟二级出水为成垢介质,采用污垢质量测定、热阻实时监测、微观结构观察相结合方法研究了污垢形成过程特性,并分析了垢样组成。结果表明,微生物污垢与颗粒污垢间存在多重性交互作用,导致随颗粒浓度升高污垢质量呈增长趋势,而污垢热阻则先上升后下降。出现此结果的原因是,颗粒影响污垢组成、密度、导热系数、微观结构等,并使其呈现不同变化趋势。
Urban secondary effluent heat reuse process heat transfer surface microbial fouling and granular dirt and other symbiotic mixed dirt. In order to analyze the influence of inorganic particles on the formation of microbial fouling, the simulated secondary effluent with controllable microorganism species and concentration and inorganic particle content as scale-forming medium was used to study the effects of fouling quality, real-time monitoring of thermal resistance and microstructure observation Soil fouling process characteristics were analyzed and scale-like composition was analyzed. The results showed that there was a multiplicity interaction between microbial fouling and granular fouling, which resulted in an increasing trend of fouling quality with the increase of granular concentration, while the fouling thermal resistance firstly increased and then decreased. The reason for this result is that the particles affect the dirt composition, density, thermal conductivity, microstructure and so on, and make it show different trends.