Location characteristics of the nozzle structure in the double P-type radiant tube

XU Qian; FENG Jun-xiao; ZHOU Wen-hua; CHEN Yan-mei

doi:10.13374/j.issn2095-9389.2017.05.014

Volume 39 Issue 5

May 2017

Turn off MathJax

Article Contents

Article Navigation > Chinese Journal of Engineering > 2017 > 39(5): 756-761

XU Qian, FENG Jun-xiao, ZHOU Wen-hua, CHEN Yan-mei. Location characteristics of the nozzle structure in the double P-type radiant tube[J]. Chinese Journal of Engineering, 2017, 39(5): 756-761. doi: 10.13374/j.issn2095-9389.2017.05.014

Citation:

XU Qian, FENG Jun-xiao, ZHOU Wen-hua, CHEN Yan-mei. Location characteristics of the nozzle structure in the double P-type radiant tube[J]. Chinese Journal of Engineering, 2017, 39(5): 756-761. doi: 10.13374/j.issn2095-9389.2017.05.014

Citation:

PDF( 3894 KB)

Location characteristics of the nozzle structure in the double P-type radiant tube

doi: 10.13374/j.issn2095-9389.2017.05.014

School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China

Received Date: 2016-07-04

Abstract

Abstract

To optimize combustion efficiency, the structural characteristics of the zoned and staged double P-type gas-fired radiant tube were improved. The corresponding experimental and numerical studies were performed on the new radiant tube and the results show that deviations in the monitoring parameters are less than 1%, except for a NO_x concentration of 11.6%, which proves the reliability of the model. On this basis, the gas and wall temperatures were compared by changing the nozzle position and structure parameters of main and branch pipes. The results show that as the nozzle position moves outward, the highest value of the surface temperature of the radiant tube gradually decreases and the minimum value of the wall temperature gradually increases. When the nozzle of the branch pipe locates at the intersection of the tee and branch pipes, it helps to reduce the impact of the high temperature gas on the pipe wall, improve the uniformity of the branch radial temperature, and prolong the service life of the radiation tube. When the nozzle is fully premixed, the temperature difference is minimized. When the pipe nozzle is asymmetric, the difference in the wall temperatures is minimized and the thermal combustion efficiency is the highest.
- radiant tube,
- nozzle,
- air-fuel ratio,
- structure,
- nitrogen oxide control

FullText(HTML)

References(14)

References

[1]	Ahanj M D, Rahimi M, Alsairafi A A. CFD modeling of a radiant tube heater. Int Commun Heat Mass Transfer, 2012, 39(3):432
[2]	Zhong G Q, Wang D F, Wu D H. Application of double-regenerative radiant tube technology on roller hearth normalizing furnace. Energ Procedia, 2015, 66:201
[3]	Tsioumanis N, Brammer J G, Hubert J. Flow processes in a radiant tube burner:combusting flow. Energ Convers Manage, 2011, 52(7):2667
[4]	Irfan M, Chapman W. Thermal stresses in radiant tubes:a comparison between recuperative and regenerative systems. Appl Therm Eng, 2010, 30(2):196
[7]	Liu J X, Gao S, Jiang X M, et al. NO emission characteristics of superfine pulverized coal combustion in the O₂/CO₂, atmosphere. Energ Convers Manage, 2014, 77:349
[8]	Wu H, Kim Y J, Vandadi V, et al. Experiment on superadiabatic radiant burner with augmented preheating. Appl Energ, 2015, 156:390
[10]	Saleh H E. Effect of exhaust gas recirculation on diesel engine nitrogen oxide reduction operating with jojoba methyl ester. Renewable Energ, 2009, 34(10):2178
[13]	Saravanan P, Sahoo G, Srikanth S, et al. Failure analysis of radiant tube burners in continuous annealing line (CAL) of an integrated steel plant. J Failure Anal Prevention, 2011, 11(3):286
[14]	Hájek J, Jegla Z, Vondál J. Numerical analysis of radiant section of fired heater focused on the effect of wall-tube distance. Comput Aided Chem Eng, 2014, 33:331
[15]	Jegla Z, Hájek J, Vondál J. Numerical analysis of heat transfer in radiant section of fired heater with realistic imperfect geometry of tube coil. Chem Eng Trans, 2014, 39:889
[16]	Normann F, Andersson K, Leckner B, et al. High-temperature reduction of nitrogen oxides in oxy-fuel combustion. Fuel, 2008, 87(17):3579
[18]	Reihani A, Razavi S A, Abbasi E, et al. Failure analysis of welded radiant tubes made of cast heat-resisting steel. J Failure Anal Prevention, 2013, 13(6):658
[19]	Gao H L, Li H Y, Shi Y Z, et al. Discussion on the structure of low-temperature radiant heater of gate station. Appl Mech Mat, 2015, 700:660
[21]	Li X, Zhang J, Yang H, et al. Combustion characteristics of non-premixed methane micro-jet flame in coflow air and thermal interaction between flame and micro tube. Appl Therm Eng, 2016, 112:296