微生物污垢对典型换热器传热影响研究  

Study on Influence of Biofouling on the Typical Heat Exchanger Transfer

作　　者：曹生现[1] 崔长龙[1] 关晓辉[1] 刘洋[1] 徐志明[1] 杨善让[1] 

机构地区：[1]东北电力大学自动化工程学院,吉林132012

出　　处：《工程热物理学报》2015年第3期631-635,共5页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.51376042);吉林省科技发展计划资助项目(No.20125050);吉林市科技发展计划资助项目(No.201262504)

摘　　要：本文以电厂循环冷却塔塔底黏泥中分离纯化出的致垢微生物铁细菌为实验介质,利用污垢热阻动态模拟实验台,在恒定工况下(水温30℃,流速0.4 m·s-1),动态模拟了光管、缩放管、横纹管三种不锈钢典型换热器微生物污垢形成过程。在分析比较三种典型换热器传热性能的基础上,实验测试了三种换热器的污垢热阻,并对垢样成分进行了分析。结果表明:强化管(缩放管和横纹管)传热性能和抑垢能力优于光管,光管、缩放管和横纹管的污垢诱导期分别为;25 h、40 h和45 h,污垢热阻值为:6×10^(-4)m^2·K·W^(-1)、2×10^(-4)m^2·K·W^(-1)和3×10^(-4)m^2·K·W^(-1),由此表明三种换热管的传热和抑垢能力:缩放管>横纹管>光管。在铁细菌形成的污垢垢样成分分析中Fe元素含量最多,其次是C,表明循环冷却水中铁含量的多少是污垢形成的重要因素之一。This study use the iron bacteria of fouling microorganisms as the experimental medium.The bacteria was isolated and purified from cooling tower bottom of the power plant.The dynamic simulation experiment station star to run under the constant conditions(water temperature 30℃,flow rate of 0.4 m·s^(-1)).The formation process of biofouling were dynamic simulated about the light tube,zoom tube and stripes tube typical stainless heat exchanger.On the basis of analysis of the comparison of three typical heat exchanger performance,fouling resistance of the three heat exchanger was monitored and the fouling samples components was analyzed.The results show that:the enhanced tube(zoom tube and stripes tube) heat transfer performance and inhibition ability is better than light tube.Light tube,zoom tube and stripes tube fouling induction period are 25 h,40 h and 45 h.The fouling resistance value are 6×10^(-4) m^2·K·W^(-1),2×10^(-4) m^2·K·W^(-1) and 3×10^(-4)m^2·K·W^(-1).It is suggested that the ability of the three tubes of the heat transfer and inhibition:zoom tube>stripes tube>light tube.The analysis of fouling sample components formed in the iron bacteria show that Fe content is the hightest,followed by C content.It is suggested that the iron concentration is one of the important factors in the formation of biofouling in the circulating cooling water.

关 键 词：换热器 微生物污垢 铁细菌 传热性能 

分 类 号：TK172[动力工程及工程热物理—热能工程] TK124