THE EFFECT OF FLUID DYNAMICS ON NOX REDUCTION IN H2/AIR NONPREM1XED JET FLAMES
IntroductionGlobal environmental impacts from hydrocarbon emissions have been accelerating the utilization of hydrogen as an alternative energy source. From the environmental point of view, the advantage of hydrogen combustion is that it does not produce the greenhouse gas CO2 or various other pollutants. However, the hydrogen flame has very high temperature compared to those of other hydrocarbon fuels, which causes the production of high levels of NOx. Considering that the effects of prompt NO, re-burning NO and radiative cooling due to soot in hydrocarbon flame are not included in a hydrogen nonpremixed flame, fluid mechanics such as aerodynamic strain and local mixing play a dominant role in the formation of Nox. Drake et al. 1 showed that increasing the strain rate on a laminar counter flow flame reduces the flame temperature and the thermal NO levels. Chen et al. 2 reported that forcing coaxial air into hydrogen flames can result in a significant reduction of the Nox emission index. In these publications, Nox reductions were explained in terms of residence time, reaction volume zone, local mixing, etc., by the change of coaxial air velocity and swirl intensity. However, although these parameters affecting fluid mechanics include the effect of turbulence intensity on Nox production, it is difficult to identify independently the role of turbulence intensity on Nox emission.
Jong-Hyun Kim Cheol-Hong Hwang Jong-Min Kim Chang-Eon Lee
School of Mechanical Engineering, Inha University, South Korea Building and Fire Research Lab., N1ST, USA
国际会议
The 7th China-Korea Workshop on Clean Energy Technology(第七届中韩清洁能源技术研讨会)
太原
英文
185-186
2008-06-25（万方平台首次上网日期，不代表论文的发表时间）