Abstract
Waste tire powder was used to reduce NO emission by reburning and burnout in a two-stage furnace with simulated flue gas. Ceramic tubes were used as the flow reactor. The reburning temperature was 1150 °C and burnout temperature was 1250 °C respectively. The simulated flue gas consisted 16.8% vol. CO2, 1.95% vol. O2, and 0.05% and 0.08% vol. NO in a helium base. 4 kinds of ashes were used to abate the reburning intermediate products, HCN and NH3 in order to improve the final NO reduction efficiency after burnout. Resutls showed that waste tire was very good reburning fuel. More than 95% NO reduction efficiency was achieved after reburning of waste tire when the stoichiometric ratio for reburning, SR2, was 0.9. When waste tire powder was mixed with lignite ash collected by baghouse at power plant and used as reburning fuel, the final NO reduction efficiency after reburning and burnout was as high as 86%, which was very close to that of natural gas. Further test showed that lignite ash could effectively reduce HCN and NH3 during reburning. The present research demonstrated that waste tire is a very effective reburning fuel.
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