Alkaline gases emission estimation and paraconsistent logic techniques application to label bagasse combustion conditions

•Application of flame espectrometry techniques and Paraconsistent logic algoritms to label bagasse combustion conditions.•Inverse methods to flame temperature calculation and application of biomass empirical correlations to Na and K emission in biomass combustion.•Experimental findings that relate flame temperature and alkali emission in sugarcane bagasse combustion.•Combustion conditions labeled for differents Na and K emission concentrations in sugarcane bagasse combustion.