板式换热器黏液形成菌与CaCO_3混合污垢实验  

Mixed fouling characteristics of CaCO_3 and slime forming bacteria in plate heat exchanger

作　　者：徐志明[1] 胡春阳[1] 王景涛[1] 刘坐东[1] 

机构地区：[1]东北电力大学能源与动力工程学院,吉林省吉林市132012

出　　处：《化工学报》2017年第1期72-78,共7页CIESC Journal

基　　金：国家自然科学基金项目(51476025)~~

摘　　要：为了探究黏液形成菌(SFB)与CaCO_3混合污垢在板式换热器(PHEs)中的成垢规律,对不同浓度的CaCO_3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CaCO_3污垢热阻渐近值之间,CaCO_3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CaCO_3对黏液形成菌存在抑制作用。维持其他条件不变,随着CaCO_3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。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.

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 

分 类 号：TK124[动力工程及工程热物理—工程热物理]