1st Nordic Drying Conference - NDC'01, Trondheim, Norway, June 27-29, 2001

MODELING OF INDIRECT-RADIANT GAS BURNERS FOR DRYING APPLICATIONS Iwona Smucerowicz and Stig Stenström Lund University, Chemical Engineering 1, P.O. Box 124, 221 00 Lund, Sweden Phone: + 46 46 222 8301, Fax: + 46 46 222 45 26, Email: Iwona.Smucerowicz@kat.lth.se Keywords: radiant heat transfer, IR gas burners, paper drying ABSTRACT Radiant gas burners are efficient devices offering a number of advantages like: providing high heat fluxes with use of compact equipment; absorption of radiation directly by the product without heating the surrounding and easy controlling of their operation. Infrared burners have found applications in ventilation systems for heating air, boilers, curing paints, baking and drying processes. Mathematical models are basic tools in analysis of the heat transfer processes in order to improve the burner performance and efficiency. In the project a basic model of an IR gas burner equipped with quartz window through which the radiation is emitted to the environment/product has been developed. The specific construction of the modeled burner prevents mixing of flue gases with the ambient air and the dried product. This feature is important in food drying process. The developed model of the heat transfer in the IR burner is used to obtain burner surface, window and flue gases temperatures, as well as the radiation efficiency of the system. A number of experiments were conducted to validate the model, where an IR pyrometer was used to measure the window temperature. A satisfactory agreement was achieved.

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