A Preliminary Study of Catalytically Stabilized Combustion

• Main Authors: Hsu, Hung-Wei, 許紘瑋
• Other Authors: Chao Yei-Chin
• Format: Others
• Language: zh-TW
• Published: 1998
• Online Access: http://ndltd.ncl.edu.tw/handle/21706796424273906895

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.