首页|Experimental study of operating parameters on the performance of a novel U-type radiant tube with dual flue gas self-circulation structures
Experimental study of operating parameters on the performance of a novel U-type radiant tube with dual flue gas self-circulation structures
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NSTL
Elsevier
Faced with the challenges of gas-fired radiant tube performance improvement and increasingly stringent environmental requirements, we proposed a novel U-type radiant tube (N-URT) with dual flue gas self-circulation structures for heat treatment furnaces. A 1:1 scale experimental system was established to evaluate heating characteristics of the N-URT under different operating conditions. The effects of input power (P) and excess air coefficient (α) on temperature uniformity, NOx emission and thermal efficiency were analyzed and discussed in-depth. It was found that the N-URT can significantly improve the heating performance compared to conventional U-type radiant tube. As P increased from 35 to 50 kW, the maximum wall temperature difference decreased from 86.9 to 63.2 °C, the thermal efficiency dropped from 92.7% to 89.1%, and the outlet NOx emission increased from 89.6 to 103.6 mg·m?3 @8% O2. As α increased, the temperature uniformity increased, but the heat recovery and NOx reduction decreased. In addition, the effect of P on NOx emission and maximum wall temperature difference was more significant than α, indicating that the air supply strategy for a given P should be carefully considered. Accordingly, the experimental results can provide a theoretical guidance for the development and application of the radiant tube.
Dilution combustionFlue gas recirculationNOx emissionRadiant tubeWall temperature difference
Li W.、Fan H.、Feng J.、Bai W.、Zhao Y.、Xie K.、Gao J.、Liu C.、Yan D.、Zhao H.
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Angang Steel Co Ltd Technology Center
School of Energy and Environmental Engineering University of Science and Technology Beijing
School of Intelligent Manufacturing Weifang University of Science and Technology
School of Civil and Resource Engineering University of Science & Technology Beijing
NSTL
Elsevier
