Effect of tube length on combustion characteristics of a Self-aspirating Radiant Tube Burner (SRTB)

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Published: Oct 16, 2018
Keywords:
Radiant tube burner Self-aspirating Heat recirculation Porous heat exchanger

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Chanon Chuenchit
Combustion and Engine Research Laboratory (CERL), Department of Mechanical Engineering, Faculty of Engineering, King Mongkut’s University of Technology Thonburi, Bangkok, Thailand
Sumrerng Jugjai
Combustion and Engine Research Laboratory (CERL), Department of Mechanical Engineering, Faculty of Engineering, King Mongkut’s University of Technology Thonburi, Bangkok, Thailand

Abstract

Radiant tube burners (RTBs) are widely used in heating process of industrial production such as batch annealing and heat treating process. Most of the RTBs operate at high capacity that use a lot of fuel and combustion air to yield high gas temperature. Therefore, the air compressor is needed in order to supply the sufficient air for completely combustion. The objective of this research is to study the effect of the tube length on combustion characteristics of a self-aspirating radiant tube burner (SRTB) equipped with an energy recirculation using a porous heat exchanger concept. Three different lengths of Ushaped tube of 10 cm in diameter were selected, i.e. 0.8 m, 1.0 m and 1.25 m, respectively, which are called as tube S, M and L in the study. Because the combustion air is naturally entrained through the venturi burner by the momentum of fuel jet, therefore the air compressor is not used in this method. Temperature distribution along the SRTB and emission (NOx & CO) were measured. The results show that the temperature distribution of the tube L is higher than the other tubes at the same firing rate (FR). The flame can stabilize inside the SRTB for the FR in the range of 3.66-8.28 kW. The maximum temperature inside SRTB is 1,481oC. The NOx and CO emission are less than 336 ppm and 450 ppm, respectively.

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How to Cite
Chuenchit, C., & Jugjai, S. (2018). Effect of tube length on combustion characteristics of a Self-aspirating Radiant Tube Burner (SRTB). Journal of Research and Applications in Mechanical Engineering, 1(2), 19–23. Retrieved from https://ph01.tci-thaijo.org/index.php/jrame/article/view/150693
Issue
Vol. 1 No. 2 (2012)
Section
RESEARCH ARTICLES

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