Analysis of gaseous pollutants generated during natural gas and waste material combustion process

Taking into account the obligations of Poland under Treaty of Accession concerning waste management order, the most important problem is the waste recovery and waste disposal. Sewage sludge is wastes which can be include to the biomass-based materials. The waste storage should be limited, because of obligations of the municipal waste reduction. The increasing charges of waste storage and limited possibilities of waste disposal in agriculture (caused by heavy metals) are the factors, which suggest searching new technologies. One of waste disposal method is the thermal utilization. The thermal utilization is an energy production method as well as a chemical waste utilization. This paper presents the numerical modelling of the possibilities of using sewage sludge in the combustion processes. The computer simulation makes possible to analyse complex phenomena which are otherwise difficult to observe. The aim of this work was modelling the natural gas combustion process with sewage sludge used as reburning fuel to predict the amount of pollutants generated (NOx, CO, SO2) in the exhaust gases. The numerical calculations were done using the CHEMKIN program. Results of calculations were done taking into account the influence of temperature, pressure and residence time.