Formation of NO in staged-air combustion with flue gas recirculation

• Main Authors: Tsai, Ching-Chao, 蔡景昭
• Other Authors: Ma, Hsiao-Kang
• Format: Others
• Language: zh-TW
• Published: 1994
• Online Access: http://ndltd.ncl.edu.tw/handle/13856964859023225127

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.