Research on combustion and NOx emission characteristics in a cylinder combustion chamber of an F-class gas turbine

• 1、East China Electric Power Test and Research Institute China Datang Corporation Science and Technology Research Institute Co. Ltd., Hefei 230009, China
• 2、School of Mechanical Engineering, Hefei University of Technology, Hefei 230009, China

Abstract：This work aims to provide technical reference for the combustion adjustment and autonomous upgrade of China\'s F-class gas turbine combustion system. Specifically, a full three-dimensional physical model of a cylinder annular combustion chamber in an F-class gas turbine was employed, and the Realizable k-ε turbulence model and the flamelet generated manifold (FGM) combustion model were used to study the effects of the deflection angle of the excess air coefficient, the main swirl vanes and the pilot fuel ratio on the combustion characteristics in the combustion chamber. The results show that both the maximum and average temperatures at the outlet surface of the single cylinder reduce with the rise of the excess air coefficient at the inlet of single cylinder,, and the outlet temperature distribution coefficient (OTDF) increases slightly, which is not conducive to the uniformity of temperature distribution at the exit surface. However, the NOx emissions showed a trend of first sharp decline and then slow increase. By appropriately increasing the deflection angle of the main swirl vanes, the maximum temperature in the combustion chamber and on the outlet surface can be reduced, the temperature uniformity can be improved, and the emission of NOx pollutants presents a downward trend. When the pilot fuel ratio increases from 4% to 8% and the total fuel flow remains unchanged, the inlet distribution of the fuel has little effect on the temperature field characteristics of the outlet surface, while a significant increase in the NOx emission was observed.

Keywords： gas turbine cylinder combustor temperature field NOx numerical simulation