| Summary: | 碩士 === 國立臺灣大學 === 機械工程研究所 === 82 === The purpose of this research is to study the control of NOx
formation and destruction by using air-staged combustion tech-
nology with natural gas fuel. The experiments include changing
the strength of swirl in primary combustion zone ( PCZ ),
lowing the local combustion temperature, and adjusting flue gas
re- circulation ( FGR ) amount to optimize the reduction of NOx
emission in a small-scale 70,000 Btu/hr furnace. The available
experimental results are used to identify the best operating
condition for controling NOx emission. The exhausting amount of
NO is mainly dependent upon the fuel-air mixing in the PCZ by
using air-staged combustion. The moderate adjusting the staged
air and the strength of swirl can efficiency are found in L/
D=5.2 region when in the case .PHI.= 1.00 and S=0.56. It is
also found that the adding of 17% FGR into PCZ may improve the
NO-reduction. However, while increasing the amount of FGR over
17%, the NO-emission will not be improved and the flame is in
instable condition.
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