Numerical Investigation of Combustion Performance of Coke Oven Gas in a Model Gas Turbine Combustor

In this study, the combustion performance of coke oven gas was investigated as an alternative fuel in a model gas turbine combustor. Coke oven gas realesed by carbonization may be an alternative fuel for gas turbine combustor. The non-premixed turbulent combustion in this combustor was modelled by using Ansys Fluent code. Numerical models used in this study involved the k-epsilon model of turbulent flow, the Mixture Fraction/PDF model of non-premixed combustion and P-1 radiation model. The modelling was performed for 60 kW heat input and lambda=1.1, lambda=1.3 and lambda=1.5 excess air ratios. According to the results, the maximum temperature for 60 kW and lambda=1.1 methane combustion condition was 2230 K and this temperature value was the maximum temperature for all combustion conditions. Temperature decreases in the combustor and combustor's exit zone were observed with increasing secondary air and with adding dilution air. In similar conditions, the maximum temperature distribution was observed of 2150 K for 60 kW and lambda=1.1 combustion condition for coke oven gas combustion. The temperature levels obtained for coke oven gas were slightly lower than temperature levels for methane combustion. Although slight difference between the temperature levels, temperature distributions for both fuels are very similar and coke oven gas may be an alternative to methane for gas turbine combustors.