| Summary: | 碩士 === 國立成功大學 === 航空太空工程學系 === 86 === Catalytically stabilized combustion is considered one of the
most succ- essful techniques in improving lean stability and
reducing NOx emissions tosub-10ppm level. The major objective of
this research is to conduct a prel-iminary study to investigate
the operation and performance characteristics of the
catalytically stabilized combustion using labdesigned combustor
witha honeycomb monolith catalyst and the result data will
provide useful insi-ght to the design of an improved catalytic
combustion system. Results revealed that the catalytic
combustion may be controlled by mass-transfer or kinetic
processes depending on the equivalence ratio and the residence
time resulting in different catalyst-bed outlet temperature
andfuel conversion ratio characteristics. Moreover, the gas
temperature at the outlet of catalyst bed is seen to increase
with the inlet equivalence ratioand enchances stabilization of
the downstream flame. When operated with high equivalence ratio
and long residence time, the released energy from the catalyst
bed heats up the inlet gas temperature by radiation transfer.
Fuel conversion ratio strongly depends on the equivalence ratio
and the gasvelocity. An optimal fuel conversion ratio can be
achieved by adapting theequivalence ratio. NOx emissions can be
improved significantly, however, COemissions increase with
reducing the residence time. Significant fuel sav-ing is
observed in experiment when comparing with other type of
combustor.
|
|---|
