A. Jančauskas “Reduction of nitrogen and sulfur compound emissions in biofuel boilers using combined methods” doctoral dissertation defence

Author, Institution: Adolfas Jančauskas, Kaunas University of Technology

Science area, field of science: Technological Sciences, Energetics and Power Engineering, T006

Scientific Supervisor: Assoc. Prof. Dr. Kęstutis Buinevičius (Kaunas University of Technology, Technological Sciences, Energetics and Power Engineering, T006)

Dissertation Defence Board of Energetics and Power Engineering Science field:
Dr. Nerijus Striūgas (Lithuanian Energy Institute, Technological Sciences, Energetics and Power Engineering, T 006) – chairperson
Prof. Dr. Hab. Dagnija Blumberga (Riga Technical University, Latvia, Technological Sciences, Energetics and Power Engineering, T006)
Prof. Dr. Algirdas Jasinskas (Vytautas Magnus University Agriculture Academy, Technological Sciences, Environmental Engineering, T004)
Prof. Dr. Hab. Gintautas Miliauskas (Kaunas University of Technology, Technological Sciences, Energetics and Power Engineering, T004)
Dr. Raimondas Pabarčius (Lithuanian Energy Institute, Technological Sciences, Energetics and Power Engineering, T006)

The doctoral dissertation is available at the library of Kaunas University of Technology (K. Donelaičio g. 20, Kaunas).

Annotation:

The prevailing technologies for boiler flue gas desulphurisation and denitrification are selective.  The combined impact on the reduction of overall emissions of biofuel reciprocating grate boilers has not been sufficiently studied. This dissertation is intended to determine the combined effects of primary and secondary measures on nitrogen and sulfur emissions. Experimental studies were carried out in industrial boilers (4 – 12 MW) and research stands (20 kW) of similar design and operating conditions, burning wood and waste of agricultural, industrial and animal origin. Selective non-catalytic reagents (NH₃, (NH₂)₂CO), solid reagent (CaO), flue gas recirculation, excess air and combination of these measures on flue gas NO₂, N₂O, NH₃, HCN, SO₂, SO₃ and H₂S emissions were determined. Flue gas recirculation and insufficient excess air have been found to reduce NO, NO₂, NH₃, SO₃ and H₂S emissions but increase SO₂, HCN and N₂O emissions. These methods must therefore be combined with additional desulphurisation measures. Experimental measurements also showed that selective non-catalytic reagent ((NH₂)₂CO) reduces not only NO, NO₂, but also SO₂ and H₂S concentrations in biofuel combustion products. The dissertation presents a methodology for the calculation of NOx and SO₂ concentrations in flue gas based on the results of experimental research, which allows for the optimal selection of emission reduction measures.