The combustion of biomass – The impact of its types and combustion technologies on the emission of nitrogen oxide
2016
Mladenović, Milica R. (Institute of Nuclear Sciences Vinča, Belgrade (Serbia). Laboratory for Thermal Engineering and Energy) | Dakić, Dragoljub V. (Faculty of Mechanical Engineering, Belgrade (Serbia). Innovation Center) | Nemoda, Stevan Đ. (Institute of Nuclear Sciences Vinča, Belgrade (Serbia). Laboratory for Thermal Engineering and Energy) | Paprika, Milijana J. (Institute of Nuclear Sciences Vinča, Belgrade (Serbia). Laboratory for Thermal Engineering and Energy) | Komatina, Mirko S. (Faculty of Mechanical Engineering, Belgrade (Serbia)) | Repić, Branislav S. (Institute of Nuclear Sciences Vinča, Belgrade (Serbia). Laboratory for Thermal Engineering and Energy) | Erić, Aleksandar M. (Institute of Nuclear Sciences Vinča, Belgrade (Serbia). Laboratory for Thermal Engineering and Energy)
Harmonization of environmental protection and the growing energy needs of modern society promote the biomass application as a replacement for fossil fuels and a viable option to mitigate the greenhouse gas emissions. For domestic conditions this is particularly important as more than 60% of renewables belongs to biomass. Beside numerous benefits of using biomass for energy purposes, there are certain drawbacks, one of which is a possible high emission of NOx during the combustion of these fuels. The paper presents the results of the experiments with multiple biomass types (soybean straw, cornstalk, grain biomass, sunflower oil, glycerin and paper sludge), using different combustion technologies (fluidized bed and cigarette combustion), with emphasis on the emission of NOx in the exhaust gas. A presentation of the experimental installations is given, as well as an evaluation of the effects of the fuel composition, combustion regimes and technology on the NOx emissions. As the biomass combustion took place at temperatures low enough that thermal and prompt NOx can be neglected, the conclusion is the emissions of nitrogen oxides primarily depend on the biomass composition - it is increasing with the increase of the nitrogen content, and decreases with the increase of the char content which provides catalytic surface for NOx reduction by CO.
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