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Energies 2018, 11(8), 2173; https://doi.org/10.3390/en11082173

Combustion Characteristics and NOx Emission through a Swirling Burner with Adjustable Flaring Angle

1
Mechanical Engineering College, Xi’an Shiyou University, Xi’an 710065, China
2
Xi’an Thermal Power Research Institute Co., Ltd., Xi’an 710032, China
3
State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China
*
Authors to whom correspondence should be addressed.
Received: 1 July 2018 / Revised: 13 August 2018 / Accepted: 18 August 2018 / Published: 20 August 2018
(This article belongs to the Special Issue Cleaner Combustion)
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Abstract

A swirling burner with a variable inner secondary air (ISA) flaring angle β is proposed and a laboratory scale opposed-firing furnace is built. Temperature distribution and NOx emission are designedly measured. The combustion characteristics affected by variable β are experimentally evaluated from ignition and burnout data. Meanwhile, NOx reduction by the variable β is analyzed through emissions measurements. Different inner/outer primary coal-air concentration ratios γ, thermal loads and coal types are considered in this study. Results indicate that β variation provides a new approach to promote ignition and burnout, as well as NOx emission reduction under conditions of fuel rich/lean combustion and load variation. The recommended β of a swirling burner under different conditions is not always constant. The optimal βopt of the swirling burner under all conditions for different burning performance are summarized in the form of curves, which could provide reference for exquisite combustion adjustment. View Full-Text
Keywords: swirling burner; flaring angle; fuel rich/lean combustion; low load; combustion adjustment swirling burner; flaring angle; fuel rich/lean combustion; low load; combustion adjustment
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Zhang, Y.; Luo, R.; Dou, Y.; Zhou, Q. Combustion Characteristics and NOx Emission through a Swirling Burner with Adjustable Flaring Angle. Energies 2018, 11, 2173.

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