Numerical analysis of effects of over-fired air on NO reduction in a down-fired furnace
ZHANG Junxia
SHEN Jianbiao
LI Haodong
LI Pengteng
Abstract：To investigate effects of over-fired air on NO reduction in a down-fired furnace,Fluent6. 3. 26 which was used to calculate fluid mechanics was adopted to simulate the combustion process of pulverized coal in a down-fired furnace. Parameters in the furnace were ob-tained at three kinds of over-fire air position,including temperature fields,velocity fields and concentration fields. The interaction of bluff body and over-fire air formed a lean-oxygen area which prohibited the formation of NO. As the over-fire air moved downward,and a larger recirculating zone of pulverized coal appeared. NO content at the outlet of the furnace reduced. The NO at the outlet of the furnace were compared to the experimental data in reference,the error were less than 18. 4%.
Keywords：down-fired furnacepulverized coal combustionNOtemperature fieldvelocity fieldconcentration field
Publication Date：2015-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 85-90 )