不锈钢缩放管中典型致垢微生物致垢能力  

Study on fouling ability of typical fouling microorganisms in the stainless steel zoom pipe

作　　者：关晓辉[1] 崔长龙[1] 曹生现[1] 鲁敏[1] 付俊杰[1] 孙玲玲[1] 杨善让[1] 

机构地区：[1]东北电力大学化学工程学院,吉林吉林132012

出　　处：《化工进展》2013年第6期1429-1434,共6页Chemical Industry and Engineering Progress

基　　金：国家自然科学基金(50806010);吉林省科技发展计划(20125050);吉林市科技发展计划(201262504)项目

摘　　要：以电厂循环冷却塔塔底黏泥中分离纯化出的3种致垢微生物铁细菌(IB)、硫酸盐还原菌(SRB)、黏液形成菌(HB)为实验菌种,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),动态模拟了3种致垢菌及其混合菌的微生物污垢形成过程。实验测得了3种致垢菌和混合菌的污垢热阻,并对垢样成分进行了ICP-MS和阴离子分析。结果表明:污垢诱导期分别为28h、45h、70h和18h;污垢热阻渐近值为2 10-4m2·K/W、1.75 10-4m2·K/W、1.45 10-4m2·K/W和4.9 10-4m2·K/W。由此表明致垢菌的致垢能力大小为:混合菌>IB>SRB>HB。垢样成分分析结果表明:IB垢样成分分析中Fe、C和NO3-含量较多,而重金属离子及Cl-含量较少,说明其具有较强的致垢能力而腐蚀能力较弱;SRB垢样分析显示,S、Fe及Cl-相对较高,且重金属Ni、Cr含量较多,说明其致垢的同时具有较强的腐蚀特性;HB形成的污垢主要以C、N及NO3-为主,且含有一定量的Cl-,表明此菌也具有一定的腐蚀性质。This study simulated dynamical fouling process of three fouling microorganisms, i.e. iron bacteria （IB）, sulfate-reducing bacteria （SRB）, and slime forming bacteria （HB）, and their mixtures isolated from the slime in the bottom of circulating cooling tower. Experimental conditions were kept constant at 30℃ water temperature and 0.4 m/s flow rate. The fouling resistances for IB, SRB, HB and their mixture were by ICP-MS and anion analysis of fouling samples was investigated. The results showed that the induction time of fouling for the four groups were 28 h, 45 h, 70 h and 18 h, respectively. The fouling resistance asymptotic values were 2 × 10-4 m_2·K/W, 1.75 × 10.4 m_2·K/W, 1.45 × 10-4m2·K/W and 4.9 × 10-4m2·K/W, respectively. The fouling abilities of the four groups were in the order of mixture 〉 IB 〉 SRB 〉 HB. The composition analysis of fouling samples showed that IB contained relatively high concentrations of Fe, C and NO3- , and low contents of heavy metal ions and CI-, indicating abilities of strong fouling and weak corrosion. The SRB sample contained mainly S, Fe, CI-, Ni and Cr, indicating strong corrosion abilities. The HB sample mainly contained C, N, NO3-and certain amount of CI-, showing its ability of corrosion.

关 键 词：铁细菌（IB） 黏液形成菌（HB） 硫酸盐还原菌（SRB） 微生物污垢 致垢能力 

分 类 号：TE08[石油与天然气工程]