交叉缩放椭圆管中微生物污垢特性  

Microbial fouling characteristics of the alternating elliptical axis tube

作　　者：徐志明[1] 郝占龙[1] 张一龙[2] 刘坐东[2] 王磊[1] 王景涛[1] 

机构地区：[1]东北电力大学,吉林吉林132012 [2]华北电力大学,北京100000

出　　处：《微生物学通报》2013年第11期1978-1986,共9页Microbiology China

基　　金：国家自然科学基金项目(No.51076025)

摘　　要：【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] For the study of the deposit pattern of the microbial fouling attaching on the surface of the heat exchanger, the deposit properties represented, respectively, through the alternating elliptical axis tube and pure tube were discussed by experiments. [Methods] The scheme was framed by taking iron bacteria as the strain, which is refined and purified from the natural Songhua River. In this work, the fouling dynamic simulation system was invited, together with the contrast experiments mean, it helped to achieve the influence analyses of fouling formation preformed by iron bacteria with the change of the flow rate and variation of water quality parameters under the industrial environments. [Results] The results demonstrated that, due to the increasing the flow turbulence caused by the alternating elliptical axis tube, the fouling precipitation amount in the alternating elliptical axis tube was less than that in the pure tube; moreover, the higher the flow rate was, the lower of the average precipitation amount of iron bacteria in the heat exchanger tube was. In addition, two parameters, including working fluids’ pH in the alternating elliptical axis tube and electrical conductivity, would increase first, and then tended to be stable; whilst the other parameters, involving the Fe2＋, COD, DO’s content would show the decline tendency along with the accumulation of microbial fouling. [Conclusion] In general, the anti-fouling capacity of the alternating elliptical axis tube is superior to the pure tube, and the formation of the microbial fouling does have evident and remarkable effect on the water quality parameter of cooling water.

关 键 词：微生物垢 交叉缩放椭圆管 污垢热阻 水质参数 

分 类 号：TK12[动力工程及工程热物理—工程热物理]