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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-421-2

International Heat Transfer Conference 15
August, 10-15, 2014, Kyoto, Japan

Pilot Test and Model Analysis of Plastic Heat Exchanger for Flue Gas Heat Recovery

Get access (open in a dialog) DOI: 10.1615/IHTC15.eef.008661
pages 2055-2064

Résumé

Low temperature corrosion to metal heat exchangers is one of the main problems in flue heat recovery. With the development of polymer materials, it is possible to use plastic to make anti-corrosion heat exchangers to overcome the limitation. In this paper, a fin tube heat exchanger made of special thermally conductive plastic was designed and manufactured. Pilot tests on corrosion, thermal stability and overall heat transfer coefficient were carried out to confirm the feasibility of plastic heat exchanger for flue heat recovery in power plants. Calculation model using empirical and experimental correlations was also developed. With this model, influence of thermal conductivity of material, fouling thermal resistance and geometric parameters were studied. It is found that fouling thermal resistance can lead up to 20% of performance reduction. The thermal conductivity of material needs to reach a threshold value of 15~20W/mK to achieve satisfactory heat transfer performance. And the geometric parameters not only affect the heat transfer performance, but also determine the material consumption which relates to initial investment. Hopefully, the findings in this paper will give some reference for further optimization and future application.