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Research Papers

The Antifouling Effects of Copper-Oxide Filler Incorporated Into Paint-Based Protective Films Applied to Steam Surface Condenser Tubes

[+] Author and Article Information
H. C. R Reuter, M. Owen

Department of Mechanical Engineering,
Stellenbosch University,
Stellenbosch 7599, South Africa

J. L. Goodenough

G-line Engineering,
Durban 4051, South Africa
e-mail: johngoodenough@hotmail.co.za

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received May 3, 2017; final manuscript received January 14, 2018; published online May 8, 2018. Assoc. Editor: Amir Jokar.

J. Thermal Sci. Eng. Appl 10(4), 041015 (May 08, 2018) (6 pages) Paper No: TSEA-17-1148; doi: 10.1115/1.4039354 History: Received May 03, 2017; Revised January 14, 2018

Paint-based protective films (PPFs) are used to protect condenser tubes from corrosion and erosion but have been shown to be susceptible to biofouling. Here, the biocidal properties of copper-oxide fillers incorporated into PPFs are explored in this paper. Specifically, two PPFs filled with 20% and 50% filler (by weight) are tested in parallel with a nonbiocidal ordinary epoxy PPF, and bare stainless steel tube. Using double-pipe co-current flow heat exchangers installed at a thermal power plant, actual cooling water exiting the condenser is evenly distributed between the test tubes. Heat transfer in the condenser is simulated by heated water flowing through each annulus of the double-pipe heat exchangers, thereby maintaining repeatable outer convection conditions. An exposure test of 125 days shows that the 50% biocide-filled PPF has the lowest fouling factor of all the tubes. The nonbiocidal epoxy has the highest fouling factor and the 20% filled PPF behaves similarly. Both of these are greater than the bare stainless steel control tube. The 50% filled PPF is compared to the fouling of an existing admiralty brass tube and the shapes of the fouling curves are similar. This evidence suggests that provided the filler concentration is sufficiently high, there is the potential for the copper-oxide filler to reduce the asymptotic composite fouling factor by virtue of its antibacterial properties.

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References

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Figures

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Fig. 1

Schematic showing common inverted manometers for static pressure measurement

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Fig. 2

Heat transfer path across test tube

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Fig. 3

Measured fouling factors versus exposure time

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Fig. 4

Measured fouling factors versus exposure time (brass versus biocidal PPFs)

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Fig. 5

Cleanliness factors versus exposure time

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Fig. 6

Measured friction factors

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Fig. 7

Bulk fouling fluid velocity during test

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