CFD investigation on combustion and NO x emission characteristics in a 600 MW wall-fired boiler under high temperature and strong reducing atmosphere(PDF)
发布时间：2025-04-30
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- 发布时间：
- 2025-04-30
- 论文名称：
- CFD investigation on combustion and NO x emission characteristics in a 600 MW wall-fired boiler under high temperature and strong reducing atmosphere(PDF)
- 发表刊物：
- Applied Thermal Engineering
- 摘要：
- 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.
- 合写作者：
- Yongbo Du , Chang’an Wang, Qiang Lv , Debo Li , Hu Liu , Defu Che ,
- 是否译文：
- 否
- 发表时间：
- 2017-07-22