Development of Reducing and Direct Fire Heating Technology

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Title Development of Reducing and Direct Fire Heating Technology
Creator Suzuki, Yutaka; Kaminaka, Motofumi; Takashima, Hiroyuki
Publisher Digitized by J. Willard Marriott Library, University of Utah
Date 1991
Spatial Coverage presented at Honolulu, Hawaii
Abstract A recent majar problem in continuous heat treatment furnaces for steel sheet is the achievement of high productivity without deterioration of Quality. Therefore, as a heating method, a reducing and direct flame heating technology which leads to non-oxidation and Quick heating is attractive . The conventional technolog with pre-mixed gas burners have some problems, such as the limit of maximum steel sheet temperature, the difficulty of use of hot combustion air and the life of burners. To improve these problems, a new technology has been developed. At the first stage, a high performance burner was developed with a small test furnace which was made up of a heating chamber installed a test burner and a nitrogen gas cooling box for heated steel sheets. The features of the newly developed burner are: - well mixing in a burner nozzle with a swirling airflow. - forming a large single flame with a ring-slit burner nozzle. - stabilizing a flame with swiring flow and a cone type burner tile. At the second stage, various characteristics of the developed burner such as maximum steel sheet temperatures for non-oxidation heating, heat-ing rate and NOx formation were investigated with a continuous annealing furnace model which was made up of a pre-heating chamber by waste gas, a heating chamber installed two burners, a soaking chamber with a radiant tube and a nitrogen cooling chamber. The results are as follows. l) Maximum non-oxidation heating temperature is more than 900°C. 2) Heating rate of 0.8t steel sheet is about 100°C/sec at the condition of 1330°C furnace temperarure. 3) Converted concentration of NOx in the pre-heating chamber is less than 50ppm(11%O2) .
Type Text
Format application/pdf
Language eng
Rights This material may be protected by copyright. Permission required for use in any form. For further information please contact the American Flame Research Committee.
Conversion Specifications Original scanned with Canon EOS-1Ds Mark II, 16.7 megapixel digital camera and saved as 400 ppi uncompressed TIFF, 16 bit depth.
Scanning Technician Cliodhna Davis
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Setname uu_afrc
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Reference URL https://collections.lib.utah.edu/ark:/87278/s6js9t0r