Abstract
The influence of industrial processing parameters, especially high temperature, on NOx abatement in the absence of oxygen has been experimentally. NOx reduction efficiency is significantly promoted with increasing residence time and NSR and optimal residence time and NSR are 0.7 s and 1.5, respectively, when temperature exceeds 1400 ℃. NOx reduction is strongly dependent on temperature. When temperature is lower than 1000 ℃, NO consumption is hindered due to lack of O radicals. The denitrification efficiency is significantly promoted with the increase of temperature because thermal decomposition of CO2 and NO is quite sensitive to temperature. However, NO formation from pyrolysis of HNO begins plays an important role since temperature exceeds 1400 ℃, which results in decline in NOx reduction efficiency. And the peak value of NO reduction efficiency can reach almost 100% at temperature range of 1300–1400 ℃ with NSR of 1.5. Four chemistry mechanisms have been adopted to simulate NOx reduction by ammonia. Validation shows that results calculated by POLIMI chemistry mechanism agrees better with experimental data than other 3 mechanisms.
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