Abstract
The combustion process and pollutant emission of an annular combustion chamber for a heavy-duty gas turbine were investigated by numerical method. The realizable k-ε model and finite rate/eddy dissipation model were adopted for calculations of turbulence and combustion. The effects of different swirling numbers of the double-swirler inlet on the temperature distribution and the thermal NOx formation in the combustion chamber were analyzed. The results show that the change of the swirling number of the outer swirling flow has a greater influence on the generation of the thermal NOx when compared with that of the inner swirling flow. The maximum average temperature of the central cross section of the combustor does not exceed 1760K. The average mass fraction of the generated thermal NOx at the exit decreases with the increasing outer swirling number. When the outer swirling number is less than 0.8, the generation of the thermal NOx is severe at the side wall of the combustion chamber.
Highlights
With the progress of human science and technology and the rapid development of society, environmental problems are becoming increasingly concerned
The pollutants emission of combustion chamber must be taken into account in addtion to its high efficiency and stable combustion in power generation
In order to ascertain the effects of inlet swirling strength on the pollutant emission in a combustor, we study numerically the combustion process in an annular combustion chamber of a heavy-duty gas turbine with hybrid swirlers
Summary
With the progress of human science and technology and the rapid development of society, environmental problems are becoming increasingly concerned. The pollutants emission of combustion chamber must be taken into account in addtion to its high efficiency and stable combustion in power generation. It is understood that the most widely employed method is using the Dry Low-NOx (DLN) emission combustion technology. The adopted DLN technology is always combined with the method of stabilizing combustion such as using the swirling flow. It can promote the mixing of hot and cold gas in the combustion chamber in addition to stabilization of combustion. In order to ascertain the effects of inlet swirling strength on the pollutant emission in a combustor, we study numerically the combustion process in an annular combustion chamber of a heavy-duty gas turbine with hybrid swirlers. The physical model, the mathematical model and the detailed results on temperature distribution and generation of thermal NOx affected by the inner and outer swirling numbers are introduced successively
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