Experimental Study Of Volatile-N Conversion At O-2/Co2 Atmosphere In A Drop Tube Furnace
CLEANER COMBUSTION AND SUSTAINABLE WORLD(2012)
Abstract
In coal combustion, NOx is largely formed from the oxidation of volatile nitrogen compounds such as HCN and NH3. The experiments on the volatile-N conversion to NO at O-2/CO2 atmosphere were carried out in a drop tube furnace. The effects of the excess oxygen ratio lambda (0.6-1.4), temperature (1000-1300 degrees C), O-2/CO2 ratio, and as well as CH4/NH3 mole ratio were investigated. To further understand the importance of NO reburn during volatile combustion, experiments were also performed with different concentrations of background NO (0-950 ppm). The results show that volatile-N conversion to NO is sensitive to excess oxygen ratio lambda at strongly oxidizing atmosphere. For volatile combustion, there is an optimal temperature and inlet O-2 concentration to minimize the volatile-N conversion to NO. The CH4/NH3 mole ratio plays an important role on the NO formation under oxidizing atmosphere. High levels of background NO prohibit the volatile-N conversion to NO significantly as the volatile-N conversion ratio decreases by 19-36%. The reburn fractions of recycle NO in fuel-rich and fuel-lean condition are 14.8% and 9.8% at 1200 degrees C, respectively.
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Key words
Volatile-N, NO release, O-2/CO2 combustion
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