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ISSN Online: 2377-424X

ISBN Print: 0-89116-909-1

International Heat Transfer Conference 9
August, 19-24, 1990 , Jerusalem, Israel

MATHEMATICAL MODELLING OF HEAT TRANSFER IN A GAS-FIRED REHEATING FURNACE OPERATING UNDER NON-STEADY STATE CONDITIONS

Get access (open in a dialog) DOI: 10.1615/IHTC9.720
pages 221-226

Sinopsis

This paper examines the use of a long furnace mathematical model to determine the radiation heat transfer within a natural gas-fired, continuous, pusher furnace which heats steel billets to a nominal discharge temperature of 1200°C. Predictions of the transient performance of this furnace are compared with experimental data acquired during a single shift operating period including a "cold start-up" and various production delays. The model was arranged so that the natural gas input to the burners was varied in response to the temperature indicated by a roof-mounted, control thermocouple, as occurs in practice. Good agreement was achieved between the measured and predicted start up and continuous energy consumptions, and billet discharge temperatures were also accurately predicted provided that the radiation leakage through the furnace door was taken into account. The model is subsequently used to examine the effects of controlling the furnace by measurement of the stock temperature, and in addition the benefits of using alternative forms of waste heat recovery are discussed.