Zanašení polymerového výměniku tepla z duchých vláken

PARTICULATE FOULING OF POLYMERIC HOLLOW FIBER HEAT EXCHANGER

různé

en

Thermal effectiveness of heat exchangers working in contaminated conditions is negatively affected by fouling. Surface of polymers is smooth and low-adhesion which provide additional antifouling resistance and defouling possibility. We prepared polymeric hollow fiber heat exchanger and tested it to cool down water contaminated by titanium dioxide (TiO2). Thermal performance tests showed its high effectiveness and good fouling resistance. It was found that particle deposit develops rapidly and achieves its asymptotic values during hours. It should be mentioned that high rates of fouling evolution were associated with low liquid velocities. Asymptotic (maximal) fouling level was low enough causing small influence on heat transfer. Associated decrease of overall heat transfer coefficient (HTC) was 5-20 % depending on flow regimes. Moreover it was found that particle deposit is not strong and can be easily detached and removed from the fiber surface by local increase of liquid velocity. The injection of air bubbles in the heat exchanger shell was tested as the defouling procedure and showed good efficiency.

Članek popisuje experimentalní zkoumani zanašení výměníku tepla z dutých vláken časticemi oxidu titánu.

Thermal effectiveness of heat exchangers working in contaminated conditions is negatively affected by fouling. Surface of polymers is smooth and low-adhesion which provide additional antifouling resistance and defouling possibility. We prepared polymeric hollow fiber heat exchanger and tested it to cool down water contaminated by titanium dioxide (TiO2). Thermal performance tests showed its high effectiveness and good fouling resistance. It was found that particle deposit develops rapidly and achieves its asymptotic values during hours. It should be mentioned that high rates of fouling evolution were associated with low liquid velocities. Asymptotic (maximal) fouling level was low enough causing small influence on heat transfer. Associated decrease of overall heat transfer coefficient (HTC) was 5-20 % depending on flow regimes. Moreover it was found that particle deposit is not strong and can be easily detached and removed from the fiber surface by local increase of liquid velocity. The injection of air bubbles in the heat exchanger shell was tested as the defouling procedure and showed good efficiency.

plasty, dytá vlákna, zanašení

polymer, hollow fiber, fouling, heat transfer

14.07.2013

233–239

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