Numerical simulation of pilot fuel percentage on NOx formation in an annular combustion chamber

被引：0
|
作者：
Shi L. [1 ]
Fu Z. [1 ]
Shen Y. [1 ]
Liu B. [1 ]
机构：
[1] Key Laboratory of Condition Monitoring and Control for Power Plant Equipment (North China Electric Power University), Ministry of Education, Changping District, Beijing
来源：
| 1600年 / Chinese Society for Electrical Engineering卷 / 36期
关键词：
Annular combustion chamber; Gas turbine; NO[!sub]x[!/sub] formation; Pilot fuel percentage; Stoichiometric ratio;
D O I：
10.13334/j.0258-8013.pcsee.151543
中图分类号：
学科分类号：
摘要：
The computational fluid dynamics (CFD) method was employed to simulate the impact of pilot fuel percentage on NOx formation characteristic in a heavy duty gas turbine annular combustion chamber. The predicted results show that proper adjusting pilot fuel percentage to control peak temperature and region with high temperature is an effective mean to decrease the emission of NOx in combustion chamber. Increase of pilot fuel percentage to improve the temperature of pilot diffusion flame is beneficial for ignition and stable combustion of premixed fuel gas. However, thermal NOx formation rate relatively rises with increasing of pilot fuel percentage in the region near central axis of the combustion chamber. The stoichiometric ratio in premixed stream decreases with the increasing of pilot fuel percentage which compress the premixed flame temperature and the formation of thermal NOx near the back flow region after the boss. There exists an optimal pilot fuel percentage to minimum NOx emission for this heavy duty gas turbine. Further increasing pilot fuel percentage will greatly improve the emission of NOx due to the diffusion combustion mode of pilot flame. © 2016 Chin. Soc. for Elec. Eng.
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页码：6156 / 6163
页数：7
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