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Simplified Analysis of Radiation Heat Exchange in Boiler Superheaters

2009; Taylor & Francis; Volume: 30; Issue: 8 Linguagem: Inglês

10.1080/01457630802659953

1521-0537

Dawid Taler, Jan Taler,

Thermochemical Biomass Conversion Processes

Abstract This article describes the determination of the radiation heat transfer coefficient in radiant platen superheaters and on convective heating surfaces. A new simple formula for determination of the heat transfer coefficient is derived on the basis of a diffusivity model of radiation heat exchange. The radiation heat transfer coefficients are determined on the tube surface in a convective evaporator, in a second stage convective heat superheater, and in a platen superheater of a pulverized coal-fired boiler. The calculations were carried out applying the method presented in this article, the Central Institute for Boilers and Turbines method, and formulas resulting from the analysis of heat exchange in an enclosure containing a gas of a constant temperature. In order to assess the accuracy of the achieved results, the flow of flue gas and the heat exchange were modeled using a commercial computational fluid dynamics program. Acknowledgments Dawid Taler is Assistant Professor of Mechanical Engineering at the University of Science and Technology in Cracow, Poland. He obtained his Ph.D. in 2002 from the University of Science and Technology of Cracow. He is the author of two books and many articles on heat exchangers and thermal measurements. Jan M. Taler is Professor of Mechanical Engineering at the Cracow University of Technology in Poland. He obtained his Ph.D. and D.Sc. degrees in Mechanical Engineering from the Cracow University of Technology. Since joining the university in 1974 he has authored more than 250 papers and three books in heat transfer. His research interests are heat transfer, inverse heat transfer problems, dynamics of large steam boilers and thermal stresses.