Improvement of Life and NOx Emission of Radiant Tube Heating System by Elastic-Plastic Creep Analysis

The radiant tube heating system has been widely applied to the furnaces which require isolatation of the heating atmosphere from the combustion atmosphere. However, the conventional system has a short life and it is difficult to reduce NOx emission when it is used at a high furnace temperature under...

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Published inKAGAKU KOGAKU RONBUNSHU Vol. 25; no. 3; pp. 435 - 442
Main Authors NAKAGAWA, TSUGUHIKO, NUTA, KUNIHIRO, ABE, YOSHIO, ARAI, NORIO
Format Journal Article
LanguageEnglish
Japanese
Published The Society of Chemical Engineers, Japan 1999
Subjects
burner
creep analysis
heating method
life
NOx emission
radiant tube
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Summary:The radiant tube heating system has been widely applied to the furnaces which require isolatation of the heating atmosphere from the combustion atmosphere. However, the conventional system has a short life and it is difficult to reduce NOx emission when it is used at a high furnace temperature under high combustion load, because the fuel is burned in a small space. In order to solve this problem, we have studied the cause of radiant tube life by elastic-plastic creep analysis, and have made it clear that radiant tube life depends on the uniformity of the temperature distribution along the radiant tube. We have developed a new burner using a two-stage combustion method with exhaust gas self-recirculation. As a result, the life of the new system has been increased by a factor of two or more, and NOx emission has been reduced by 20 % from previous levels. This paper presents an outline of the elastic-plastic creep analysis and the new burner, and describes the effect of its use on system life.
ISSN:0386-216X
1349-9203
DOI:10.1252/kakoronbunshu.25.435