工业循环冷却水系统中运行条件对污垢的影响

Effects of Running Conditions on Fouling in Industrial Circulating Cooling Water System

为解决污水再生后回用于工业循环冷却水易产生管道结垢和微生物滋生等问题，动态模拟了循环冷却水系统，探索温度、流速、浓缩倍数对污垢量和污垢中EPS、多糖（PS）、蛋白质（PN）、细菌总数（TB）、粘液形成菌（SFB）、铁细菌（IB）及硫酸盐还原菌（SRB）的影响。结果表明，温度升高，污垢量增加，35℃时的TB、SFB和IB含量最高。流速提高，污垢量变化不大；0．8～1．0m／s时TB、SFB、lB和SRB数量最多。增大浓缩倍数，循环冷却水系统中的污垢量增加，浓缩倍数为4．0时微生物对系统影响最大。建议系统温度宜控制在30℃以内，流速宜大于1．0m／s，浓缩倍数宜避开4．0倍。

To solve the problem of pipe scaling and microbial breeding by reuse water when it was used as circulating water., we adopted the dynamic simulation device to simulate circulating cooling water system in this study. The foulant weight, EPS and PS, PN, total number of bacteria, slime-forming bacteria, IB and SRB in EPS affected by temperature, flow rate and concentration ratio was investigated. Results showed that more fouling occurred when increasing temperature. Specifically, total number of bacteria, slime-forming bacteria and iron bacteria reached its maximum at 35℃. The foulant weight remained steady with the variation of flow velocity. To be more specific, total number of bacteria, slime-forming bacteria, iron bacteria and SRB maximized at 0.8-1.0 m/s. Further, more fouling was observed when concentration increased. The concentration ratio with the value of 4.0 N showed the largest influence on the whole system. Suggestion was proposed that the system temperature should be controlled within 30℃, while the flow rate should greater than 1.0 m/s and the concentration ratio should avoid 4.0 N.