论文部分内容阅读
【目的】为研究微生物污垢在换热表面的沉积规律,实验研究了交叉缩放椭圆管与光管的微生物污垢的沉积特性。【方法】实验以松花江水中分离纯化出的铁细菌为菌种,利用污垢动态模拟试验系统,采用对比的试验方法研究了铁细菌在工业运行环境下流速及水质参数的变化对表面污垢行程的影响。【结果】由于交叉缩放椭圆管的强化湍流作用,使交叉缩放椭圆管内污垢沉积量小于光管;水的流速越大,换热管内铁细菌平均沉积量越小;交叉缩放椭圆管内工质pH、电导率随微生物污垢的沉积先升高、然后趋于平缓;而二价铁离子含量、COD值、溶解氧含量随微生物污垢的沉积逐渐下降。【结论】交叉缩放椭圆管的抗垢性能优于光管;微生物污垢形成对冷却水水质参数的变化影响明显。
【Objective】 The purpose of this study was to investigate the deposition of microbial fouling on the heat transfer surfaces and to investigate the deposition characteristics of microbial fouling on the cross-scaled oval tubes and tubes. 【Method】 The experiments were conducted on the iron bacteria isolated and purified from Songhua River water. Using the experimental system of soil dynamic simulation, comparative experiments were carried out to study the effects of the changes of flow rate and water quality parameters on the surface fouling of iron bacteria under industrial operating conditions Impact. 【Result】 Due to the intensive turbulence of the cross-scaled oval tube, the amount of soil fouling in the cross-scaled oval tube was smaller than that of the light pipe. The larger the flow rate of water, the smaller the average amount of iron bacteria deposited in the heat transfer tube. The conductivity increased first with the deposition of microbial fouling and then tended to be gentle. However, the ferrous iron content, COD value and dissolved oxygen content decreased gradually with the deposition of microbial fouling. 【Conclusion】 The cross-scaled oval tube has better anti-fouling performance than the light pipe. Microbial fouling has a significant effect on the change of the cooling water quality parameters.