TY - JOUR
T1 - Improving the asymmetric phenomenon effects on the combustion characteristics in an opposed-fired pulverized coal boiler
AU - Liu, Wenhua
AU - Yang, Mo
AU - Zhang, Yuwen
AU - Li, Yubing
AU - Ying, Xuchen
AU - Huang, Weijia
N1 - Publisher Copyright:
© 2022 Taylor & Francis Group, LLC.
PY - 2023
Y1 - 2023
N2 - Numerical investigations were performed on an opposed-fired boiler to better understand the formation of the asymmetric phenomenon and its effects on the combustion characteristics. It is revealed that with the increasing of the inlet Reynolds numbers, the in-furnace flow and temperature fields evolve from symmetry to asymmetry under the symmetric combustion conditions. Nonlinearity was elaborated to explain this phenomenon. Three asymmetric combustion modes were proposed to optimize the deflected flowfield. The final optimal combustion pattern was established via comprehensive consideration of the general air stoichiometric ratio and reduction zone heights. Compared to the original symmetric combustion mode, asymmetric air disturbance creates better internal flowfield recirculation and improves the combustion performance, which obtains a significant NOx reduction from 369.16 mg/Nm3 to 216.16 mg/Nm3 and lowers the carbon content in fly ash from 3.465% to 2.07%, respectively.
AB - Numerical investigations were performed on an opposed-fired boiler to better understand the formation of the asymmetric phenomenon and its effects on the combustion characteristics. It is revealed that with the increasing of the inlet Reynolds numbers, the in-furnace flow and temperature fields evolve from symmetry to asymmetry under the symmetric combustion conditions. Nonlinearity was elaborated to explain this phenomenon. Three asymmetric combustion modes were proposed to optimize the deflected flowfield. The final optimal combustion pattern was established via comprehensive consideration of the general air stoichiometric ratio and reduction zone heights. Compared to the original symmetric combustion mode, asymmetric air disturbance creates better internal flowfield recirculation and improves the combustion performance, which obtains a significant NOx reduction from 369.16 mg/Nm3 to 216.16 mg/Nm3 and lowers the carbon content in fly ash from 3.465% to 2.07%, respectively.
KW - Asymmetric combustion
KW - combustion mode optimization
KW - low-NOx high-burnout combustion
KW - nonlinear characteristic
KW - opposed-fired furnace
UR - https://www.scopus.com/pages/publications/85146219803
U2 - 10.1080/10407782.2022.2157914
DO - 10.1080/10407782.2022.2157914
M3 - 文章
AN - SCOPUS:85146219803
SN - 1040-7782
VL - 83
SP - 790
EP - 813
JO - Numerical Heat Transfer; Part A: Applications
JF - Numerical Heat Transfer; Part A: Applications
IS - 7
ER -