Mixed fouling characteristics of CaCO3 and slime forming bacteria in plate heat exchanger

doi:10.11949/j.issn.0438-1157.20160878

Abstract

Abstract:

An experimental study on the mixed fouling characteristics of CaCO₃ and slime forming bacteria(SFB) in plate heat exchangers(PHEs) was carried out.The influence of concentration of CaCO₃ and slime forming bacteria on the mixed fouling was investigated.CaCO₃ had a inhibitory effect on slime forming bacteria, which was different from previous studies about mixed fouling.The results showed that the slime forming bacteria fouling played an important role in the mixed fouling.Under the same working conditions, the asymptotic thermal resistance of the mixed fouling was between the asymptotic thermal resistance of the slime forming bacteria fouling and CaCO₃ fouling.With the increase of the concentration of CaCO₃, the mixed fouling thermal resistance decreases.Conversely, with the increase of the concentration of slime forming bacteria, the mixed fouling thermal resistance increases.

Key words: plate heat exchanger, heat transfer, biofouling, crystallization fouling, biofilm, deposition

摘要：

为了探究黏液形成菌（SFB）与CaCO₃混合污垢在板式换热器（PHEs）中的成垢规律，对不同浓度的CaCO₃与黏液形成菌混合进行了实验研究。结果表明：混合污垢中，黏液形成菌微生物污垢占成垢的主要地位。微生物污垢的热阻渐近值最大，混合污垢的热阻渐近值介于微生物污垢的热阻渐近值和CaCO₃污垢热阻渐近值之间，CaCO₃污垢热阻渐近值最小。这不同于以往得到的混合污垢之间相互促进的结论，说明CaCO₃对黏液形成菌存在抑制作用。维持其他条件不变，随着CaCO₃浓度的增大，混合污垢热阻值随之减小。反之，随着黏液形成菌浓度的增大，混合污垢热阻值随之增大。

关键词: 板式换热器, 传热, 微生物污垢, 析晶污垢, 生物膜, 沉积物

CLC Number:

TK124

XU Zhiming, HU Chunyang, WANG Jingtao, LIU Zuodong. Mixed fouling characteristics of CaCO₃ and slime forming bacteria in plate heat exchanger[J]. CIESC Journal, 2017, 68(1): 72-78.

徐志明, 胡春阳, 王景涛, 刘坐东. 板式换热器黏液形成菌与CaCO₃混合污垢实验[J]. 化工学报, 2017, 68(1): 72-78.

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Mixed fouling characteristics of CaCO₃ and slime forming bacteria in plate heat exchanger

板式换热器黏液形成菌与CaCO₃混合污垢实验

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