Evaluation of fermented waste energetic characteristics and the numerical modelling of nitrogen oxides concentrations during combustion

Abstract

The paper presents the numerical modelling methodology of separated gaseous pollutants concentrations assess and results obtained by comparison with the experiment values. Gaseous pollutants separate when the solid fuel, which is consisting of different types of, fermented (also another organic and municipal) waste, are burned. It was found a new formula to calculate the conversion factor of nitrogen, which is in fuel. Also it can be used to another organic types NOx concentrations assess. The simulation results are presented applying the new values of conversion factors. The suggestion that the theoretical amount of air is proportional to the calorific value was used to check the known fuel species composition analyses data. The two equations are set by Least-squares method. It can be assessed in combustion air and combustion products theoretical quantities. Based on these addictions can be determined not only fermented waste Voro t and Vd t, but knowing only the calorific value of fuels and other fuels theoretical values. The prepared equation which presented in paper can be used to describe the dependence of nitrogen conversion in solid fuels from the nitrogen content. NOx concentration values determined during Gaska&Wandrasz model differ, on average, by 12.7 % from values identified during investigations, except for those established for fermented grain substrate. The main assumption for the formation of larger inadequacies can be related with instability of fuel combustion that is preconditioned by the bulkiness, porosity or ash content of fuel along with other factors. More detained research on the physical characteristics of fuel is necessary to have this assumption confirmed.