摘要
本文通过数值模拟和在实际锅炉上的试验,研究了310 MW Foster Wheeler技术W型火焰锅炉F层二次风下倾15°对炉内燃烧过程的影响。通过对模拟和试验的分析表明,F层二次风下倾后对炉内燃烧的影响主要表现在火焰行程延长,煤粉停留时间增加,还原区扩大,一次风与二次风的混合推迟等方面。试验和模拟结果都表明,F层二次风下倾后锅炉的火焰中心下降,飞灰含碳量降低,锅炉效率提高且NO_x排放明显减少。
The work studies the effects of declination of F secondary air with the angle of 15 degree on coal combustion and NOx emission in an 310 MW arch fired furnace by numerical simulation and field tests. The simulation results are verified by field experiments and it shows that F secondary air declination prolongs the flame path of primary coal/air flows, extends the reduction zones, increases the residence time of coal particles in the flame, and delays the mixing of primary air with the secondary air. The simulation and the experiments both demonstrate that declination of F secondary air makes the flame center moved down, unburnt carbon content decreased, and the combustion efficiency increased with NOx emission decreased at the same time.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2009年第6期1055-1058,共4页
Journal of Engineering Thermophysics
基金
国家863专题课题(No.2006AA05Z301)
国家自然科学基金资助项目(No.50721005)
关键词
W型火焰锅炉
F层二次风下倾
煤粉燃烧
提高效率
降低NOx
arch fired furnace
F secondary air declination
coal combustion
combustion efficiency
NOx emission
