Numerical Simulation of Methane Non-premixed Combustion of Annular Venturi Injector Group

被引：0
|
作者：
Cao W. [1 ]
Xu J. [1 ]
Wang Z. [1 ]
Qin P. [1 ]
机构：
[1] School of Metallurgy and Energy, North China University of Technology, Hebei Province, Tangshan
来源：
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | 2023年 / 43卷 / 19期
关键词：
flue gas recirculation; low NO[!sub]x[!/sub; natural gas; pilot combustion; venturi injector;
D O I：
10.13334/j.0258-8013.pcsee.221232
中图分类号：
学科分类号：
摘要：
Based on the actual structure and heat transfer conditions of a 0.8MW boiler in a factory, the correlation law between the jet characteristics and the circulation characteristics of the flue gas furnace in the non-premixed combustion process of methane under the structure of the annular Venturi injector group is mainly studied. The simulation method explores the influence of fuel grading ratio and flue gas internal circulation intensity on the flow field, temperature distribution and nitrogen oxide generation characteristics in the furnace. Results show that there is an optimal value for the fuel grading ratio; excessive transfer of fuel heat load to the furnace will not only destroy the combustion stability, but also enhance the local high temperature and lead to an increase in the concentration of nitrogen oxides; without the interference of other factors, the larger the volume of smoke in the ejector, the better the effect of nitrogen reduction, and then it is difficult to describe the actual situation reasonably only by using the flue gas circulation rate ѡ index. Using the synergistic technology of large-scale fine gas classification and high-intensity flue gas internal circulation, a low NOx combustion effect of less than 10mg/Nm3 can be achieved. The nitrogen oxide concentration at the outlet is reduced by 97.5%. ©2023 Chin.Soc.for Elec.Eng.
引用
收藏
页码：7539 / 7548
页数：9
相关论文
共 20 条
  • [11] WANG Guochang, WANG Bo, SI Jicang, Effects of fuel dilution and nozzle arrangement on non-premixed MILD Oxy-combustion of methane[J], Chinese Journal of Electrical Engineering, 41, 17, pp. 5973-5982, (2021)
  • [12] CHEN Weijie, Study of MLD combustion burner for NG-fired boiler, (2018)
  • [13] SI Jicang, SHU Ziyun, WANG Guochang, Numerical investigation on impacts of diluent and oxygen concentration on non-premixed MILD oxy- combustion of methane[J], Chinese Journal of Electrical Engineering, 41, 11, pp. 3692-3701, (2021)
  • [14] DONG Zhiyong, WANG Enyu, Experimental research of porous medium burner for ultra-low calorific gas[J], Journal of Engineering Thermophysics, 36, 10, pp. 2298-2302, (2015)
  • [15] VANDADI V, PARK C, 3-Dimensional numerical simulation of superadiabatic radiant porous burner with enhanced heat recirculation[J], Energy, 115, pp. 896-903, (2016)
  • [16] HOSSEINI A A，, GHODRAT M, MOGHIMAN M, Numerical study of inlet air swirl intensity effect of a Methane-Air Diffusion Flame on its combustion characteristics[J], Case Studies in Thermal Engineering, 18, (2020)
  • [17] IAVARONE S，, CAFIERO M, FERRAROTTI M, A multiscale combustion model formulation for NOx predictions in hydrogen enriched jet flames [J], International Journal of Hydrogen Energy, 44, 41, pp. 23436-23457, (2019)
  • [18] WANG Long, Study of high temperature low oxygen combustion process in industrial furnace with exhaust gas Auto-circulation, (2014)
  • [19] TAO Wenquan, Numerical Heat Transfer, (2001)
  • [20] Zehao LYU, Gensheng LI, SONG Xianzhi, Comparative numerical analysis and optimization in downhole combustion chamber of thermal spallation drilling[J], Applied Thermal Engineering, 119, pp. 481-489, (2017)
12