NO and N2O formation during the combustion of wood, straw, malt waste and peat
1999
Winter, F. | Wartha, C. | Hofbauer, H.
The NO and N(2)O formation behavior of six biofuels (spruce wood, beech wood, alder wood, straw, malt waste, peat) was studied in a formation-rate unit under conditions relevant to a fluidized-bed combustor and a grate-furnace. The concentrations of CO(2), CO, CH(4), other hydrocarbons, NO, N(2)O, HCN, and NH(3) were measured in the flue gas, shortly after the burning fuel particles. Most of the fuel nitrogen was released during devolatilization (66-75%). Relatively high conversions to NO were found. N(2)O was formed but also rapidly destroyed by the reaction: N(2)O + H leads to N(2) + OH. HCN was also formed in quantities similar to NH(3) even during wood combustion. The HCN/NH(3) ratios seemed to depend on the fuel H/N ratios. The experimental results supported the hypothesis that the nitrogen of wood and other biofuels also exists in heterocyclic structures. With the proposed NO and N(2)O formation mechanism the effects of fuel nitrogen content, temperature and oxygen partial pressure can be explained.
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