Characteristics of the Initial Stage of CaCO₃ Crystallization Fouling on Straight Oblique Fin Tube

Abstract:

To investigate the effect of CaCO₃ concentration and velocity on scaling fouling process on plain and SOFT, experiments have been done at different CaCO₃ concentration and velocity on the two kind tubes. The results are that the homogeneous nucleation rate and the growth rate are both increase when CaCO₃ concentration increases. This make the scaling particle concentration and foulant ions concentration increase, the former gets more scaling on tubes and the later enlarges the heterogeneous nucleation rate and growth rate. Higher velocity decreases the nucleation of scaling, scaling crystal and fouling resistance, but it can prolong the induction period. Higher velocity increases nucleation rate on SOFT first, but the induction period extends and the mass of scaling and fouling resistance decrease. SOFT has a bigger heat transfer coefficient than PT at both clean and fouling conditions and it has smaller fouling resistance even a little more scaling.

• Periodical: Advanced Materials Research (Volumes 671-674)
• Pages: 2535-2541
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.671-674.2535
• Online since: March 2013
• Authors: Ping Zhao, Jian Sheng, Hua Zhang
• Keywords: CaCO₃, Crystallization Fouling, Oblique Fin Tube, Pyrology

References

[1] Rabas T J, Panchal C, Sasscer D, et al. Comparison of power plant condenser cooling-water fouling rates for spirally indented and PTs, In: Chenoweth J M, ed. Fouling and Enhancement Interactions. New York: ASME, 1991, 164: 29-37.

DOI: 10.1080/01457639308939811

[2] Xu Zhi-ming, Yang San-rang, Gan Yun-hua. Experimental investigation on heat transfer and fouling characteristics of spiral-grooved tube, Journal of Thermal Science and Technology, 2003, 2(2): 136-139.

[3] Liu jin-ping, Liu Xu-feng. Economic analysis of rifled tube condenser considering fouling resistance, Journal of Thermal Science and Journal of South China University of Technology (Natural Science Edition), 2005, 33(1): 66-69.

[4] Liu Zhen, Chen Yongc-chang, Shao Bing-hua, et al. Experimental investigation on fouling characteristic of outer spirally corrugated tube, Journal of Engineering Thermophysics, 2011, 32(1): 93-96.

[5] Shuai Zhi-ming, Feng Hai-xian, Li Xue-tai. Experimental investigation on scaling in spiral indented tube，IN: Proceedings of the CSEE, 1994, 14(2): 7-12.

[6] Zhang Zhong-bin, Xu Zhi-ming, Shao Tian-cheng. Experimental investigation on the heat transfer and fouling characteristics of corrugated tube, Journal of North China Electric Power University, 2007, 34(5): 68-71.

[7] Zhu Dong-sheng, Zeng Li-ding, Qian Song-wen. Experimental investigation of fouling characteristics and fouling prevention in corrugated tube， Fluid machinery, 2007, 35(4): 9-11.

[8] Wei Li, Ralph L. Webb. Fouling characteristics of internal helical-rib roughness using low-velocity cooling tower water [J], International Journal of Heat and Mass Transfer, 2002, 45(8): 1685-1691.

DOI: 10.1016/s0017-9310(01)00263-0

[9] Panchal C B, Sasser D S. Biofouling and corrosion fouling of plain and enhanced aluminum surfaces, IN: Fouling Enhanced Interaction ASME, 1991, 164: 9-15.