Combustion of Methane and Biogas Fuels in Gas Turbine Can-type Combustor Model

Abstract

The paper presents the numerical simulation on combustion of methane and biogas mixtures in the swirl burner can-Type of gas turbine combustion chamber. The study deals with the impact of mass fraction of carbon dioxide for biogas on emissions of noxious compounds during combustion. The investigations were done for four different fuels: pure methane (100% CH4), three biogases (90%CH4+10%CO2, 75%CH4+25%CO2 and 70%CH4+30%CO2), with the constant value of equivalence ratio ( = 0.95). The numerical results show that a low content of carbon dioxide in methane-air mixture leads to a better flame stability through an increase of the volume of the recirculation zone. The numerical analysis has shown that the biogas fuel allows a reduction of about 33% on the NO emissions and about 10% on the CO emissions and carbon dioxide contained in the fuel leads to the lowering of the flame temperature, whose effect reduces NO emissions. The results of the investigation clearly demonstrate that it is possible to use such fuels in combustion systems with swirl burners.

Mathematical investigation of syngas fired burner with various configurations in the BERL combustor

“…Multiple studies (Fischer et al 19 ; Khaleghi et al 20 ) looked into the effect of CO 2 content in biogas on CO formation for non-premixed and premixed combustion in burners and modelled combustors, and the results showed that higher CO 2 content leads to lower flame stability and temperature, and thus higher CO emission. A monotonic NOx reduction with increasing CO 2 level in biogas was previously documented in a similar study (Guessab et al 21 ). By altering the H 2 and CO 2 levels in biogas, the combustion properties can be changed.…”

Effect of helium dilution on the dynamic stability of lean premixed methane flame in a model gas turbine combustor

“…The flame propagation speed increased with the increase in the hydrogen ratio. Guessab et al, [3] investigated the combustion of methane and biogas fuels in a model gas turbine burner. In the study where the addition of CO2 at different rates was tested, it was observed that the increase in the CO2 ratio increased the flame stability.…”