CFD investigation on combustion and NO x emission characteristics in a 600 MW wall-fired boiler under high temperature and strong reducing atmosphere(PDF)

Release Time:2025-04-30  Hits:

• Date:2025-04-30
• Title of Paper:CFD investigation on combustion and NO x emission characteristics in a 600 MW wall-fired boiler under high temperature and strong reducing atmosphere(PDF)
• Journal:Applied Thermal Engineering
• Summary:In this paper, a modified air staging technology for pulverized coal boilers was proposed, to notably
  reduce NO x emission by creating a zone with high temperature and strong reducing atmosphere
  (HT&SRA) in furnace. Here, the conventional air staging technology was employed in combination with
  increasing O 2 fraction of feeding gas in primary zone (O 2.p ). The new technology was numerically verified
  in a 600 MW wall-fired boiler and the temperature distribution, the char burnout and the effectiveness in
  NO x reduction were mainly examined. The results indicate that a sufficiently low stoichiometric O 2 ratio
  in primary zone (SR p ) is essential to reduce NO x emission by increasing O 2.p . The effectiveness in NO x
  reduction by increasing O 2.p also depends greatly on the injection position of over fire air (OFA). Under
  the condition of 0.7 SR p and a relatively high OFA position, the NO x emission could be reduced by
  27.6% when O 2.p is increased from 21% to 33%, while the incomplete combustion heat loss only shows
  a slight rise. In addition, the NO x reduction ratio could reach to >60% through the proposed low-NO x com-
  bustion technology compared with the current operation condition.
• Co-author:Yongbo Du , Chang’an Wang, Qiang Lv , Debo Li , Hu Liu , Defu Che ,
• Translation or Not:No
• Date of Publication:2017-07-22