Abstract
In this paper, a numerical simulation is performed on the basis of a combustion chamber of 9E gas turbine, to study the effect of premix uniformity on the NOx emission concentration. The results show that when the 9E gas turbine is working under the baseload with a fuel flow ratio of the primary nozzle R fuel deviates within an optimal interval of 78 % to 84 %, an increment in the number of secondary nozzle fuel injection points leads to a decline in NOx emission concentration. Since purge air nozzles of DLN are placed in upstream of swirl generator while the nozzles are placed downstream of swirl generator in LEC, the impact of the purge airflow rate on the NOx emission in the DLN has an opposite trend with that in the LEC. Besides, the increment of the mixed air proportion R air leads to a distinct enhancement in the local equivalence ratio peak value of the primary combustion zone outlet. Also, the distribution of the equivalence ratio changes. The NOx emission concentration is influenced as a result.
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