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Title	Advancement of Furnace Technology by Highly Preheated Air Combustion and Its Future Evolution
Creator	Katsuki, Masashi
Publisher	Digitized by J. Willard Marriott Library, University of Utah
Date	1998
Spatial Coverage	presented at Maui, Hawaii
Abstract	Recent advancement in industrial furnaces brought by highly preheated air combustion is reviewed. A large amount of waste heat can be recovered by alternating flow regenerators, and the temperature level of preheated air has reached within 100 K of the furnace temperature by an well-designed regenerator, which has resulted higher thermal efficiency of furnaces, hence the reduction of carbon dioxide emission. Adding this fact, it is noted that combustion in low oxygen atmosphere, produced by dilution of preheated air with a plenty of burned gas in the furnace, generates lower flame temperatures even with the use of highly preheated air, which contributes to reduce nitric oxide emission. As a result, energy saving and reduction of nitric oxide emission are compatible in the new technology using highly preheated air. This is the most important and attractive character of highly preheated air combustion. Further, a high quality heating process can be realized by use of regenerative burners, in which uniform heating of materials, higher heat transfer rate, and better controlabity of operation are expected. Optimum design procedure should be taken into account in the application of the technology to new fields.
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
ARK	ark:/87278/s6qn69ch
Setname	uu_afrc
ID	10422
Reference URL	https://collections.lib.utah.edu/ark:/87278/s6qn69ch

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Title	Page 4
Format	application/pdf
OCR Text	Show "flameless oxidation" in the review by Wunning [26]. O During the collaboration among industries, n e w potential for high quality heating, such as controllability of the heating pattern of the processes, uniform quality of heated materials and down sizing of the processes, w a s also recognized [16,17], although high thermal efficiency due to high flame temperature had been stressed frequently. These attractive characteristics of highly preheated air combustion are expected to bring about remarkable advancement of furnace technology, although they have not been studied intensively due to its short history. open pilot burner A pilot burner B close fuel spark plug • QJL 4-way switching valve insulation ceramic honeycomb Fig.1 Schematic structure of heat-recirculating furnace operated with high frequency alternating flow regenerators. Heat exchanger Although excess heat in exhaust gases can be transferred thoroughly to the incoming cold combustion air using an infinite long heat exchanger, the actual heat
Setname	uu_afrc
ID	10410
Reference URL	https://collections.lib.utah.edu/ark:/87278/s6qn69ch/10410