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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。
In this paper, the fouling bacteria iron bacterium isolated and purified from the bottom slime of power plant cooling tower was used as experimental medium. Using the fouling resistance thermal simulation experiment bench, under constant conditions (water temperature 30 ℃, flow rate 0.4 m · s -1 ), Dynamic simulation of the light pipe, scale tube, cross-tube three typical stainless steel heat exchanger microbial fouling formation process. Based on the analysis of the heat transfer performance of the three typical heat exchangers, the fouling resistance of the three heat exchangers was experimentally tested and the fouling-like components were analyzed. The results showed that the fouling induction periods of the intensified tube (scale tube and transverse tube) were better than those of the light tube, light tube, scale tube and transverse tube, respectively. The induction period of fouling was 25 h, 40 h and 45 h, The thermal resistance of fouling was 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), which shows the heat transfer and scale inhibition ability of the three kinds of heat transfer tubes: tube> tube> tube. In the fouling-like composition analysis of iron bacteria, the content of Fe was highest, followed by C, indicating that the amount of iron in the circulating cooling water was one of the important factors in the formation of fouling.