Journal of South China University of Technology(Natural Science Edition) ›› 2026, Vol. 54 ›› Issue (1): 1-9.doi: 10.12141/j.issn.1000-565X.250027

• Energy,Power & Electrical Engineering •     Next Articles

Study on Low Nitrogen Combustion Characteristics of Metal Fiber Burner in Limited Space

GAN Yunhua1(), CHEN Kui1, CHEN Ningguang1, CHENG Jing2(), XU Yan2   

  1. 1.School of Electric Power Engineering,South China University of Technology,Guangzhou 510640,Guangdong,China
    2.Shenzhen Special Equipment Safety Inspection Institute,Shenzhen 518038,Guangdong,China
  • Received:2025-01-21 Online:2026-01-10 Published:2025-07-18
  • Contact: CHENG Jing E-mail:ganyh@scut.edu.cn;511385726@qq.com
  • Supported by:
    the National Natural Science Foundation of China(52376108)

Abstract:

Metal fiber surface combustion technology has become one of the most promising low nitrogen combustion technologies for gas boilers because of its advantages of stable combustion process and uniform temperature distribution. Based on the low-nitrogen combustion experimental data of metal fiber surface in limited space, this study established a three-dimensional physical model of metal fiber surface combustion and carried out the full-premixed combustion numerical solution based on the porous medium resistance model, metal fiber turbulence model and EDC combustion model. It obtained the flame combustion conditions and the velocity characteristics of hot smoke flow field of metal fiber surface combustion in limited space, as well as the temperature field distribution and fuel distribution in furnace. Considering the influence of different excess air coefficient, it studied the emission characte-ristics and average generation rate distribution of prompt NO x and thermal NO x on metal fiber surface. The results show that under different excess air coefficients, the generation rate of prompt NO x is faster than that of thermal NO x . However, limited by the effective reaction space and reaction duration, the volume occupied by prompt NO x in the furnace is much smaller than that of thermal NO x .With the increase of excess air coefficient, the generation rate and emission of thermal NO x gradually decrease. When α=1.6, the emission of NO x from flue gas outlet is 22.55 mg/m3, which meets the standard of low nitrogen combustion. Therefore, in addition to changing the flame temperature, oxygen concentration and combustion mode, the generation of thermal NO x can be suppressed by controlling the excessive air coefficient, and ultra-low nitrogen combustion of industrial gas boilers can also be effectively achieved.

Key words: low nitrogen combustion, metal fiber burner, surface combustion, numerical simulation

CLC Number: