Combustion characteristics of the two-dimensional simplified combustor were simulated numerically for methane

marsh gas and biomass gas

with introduction of standard k-ε turbulence model

eddy-dispassion turbulence combustion model and P-1 radiation heat transfer model. The temperature distribution

NOx mass fraction distribution

flow field structure in the combustor were analyzed to obtain the combustion characteristics of fuels with different calorific values by comparing the combustion situations of different cross sections. Results show that

under the condition of same mass flow of inlet air and fuel

the combustion temperature decreases with the decline of calorific value of fuels

the temperature distribution is more uniform

the NOx emissions are diminished

and the flow velocity is reduced; the proper regulation of excess air coefficient can improve the effect of combustion burning

and the temperature distribution still meets the law that combustion temperature of fuels with high calorific value is higher than that of fuels with low calorific value; the mixing of combustible components with different calorific values in biofuels syngas will change the calorific value of syngas

and the appropriate mixing ratio can play a better role for biofuels.