Study On Emission Of NO_x For Nitrogen-Organic Wastewater In Double Temperature Fluidized Bed

The treatment of high concentrated nitrogen-organic wastewater is difficult by conventional methods. Organic wastewater usually embodies heating value, so incineration is generally adopted to deal with it at abroad and home. In this paper, the emission of NOx has been investigated as nitrogen organic compounds in wastewater were incinerated in a bench-scale fluidized bed with double temperature, when the wastewater contains CH3CN, CH3NO2 and C6H5NH2 respectively. The results show that the emission of NOx could be decreased efficiently as an incinerator combined by low temperature fluidized beds gasification and high temperature combustor in a rich oxygen state.The difference of emission and conversion of NOx is great for three kinds of wastewaters as temperatures vary from 500℃to 700℃in low temperature fluidized bed (LTFB) and 800℃to 950℃in high temperature combustor (HTC).In LTFB, for methyl cyanide, the emission and conversion of NOx are low and decrease a bit with increasing excess air, which varies from 0.6 to 1.2, but they increase to a peak and then fall down with increasing excess air from 1.2 to 1.4, and then achieve to maximum when excess air approaches 1.4. For nitromethane, the conversion of NOx increases gently with increasing excess air and decreases a bit with increasing temperatures. For aniline, the emission and conversion of NOx increase gradually with increasing excess air.In HTC, for methyl cyanide, the emission and conversion of NOx decrease a bit with increasing excess air. For nitromethane, they gradually decrease to a vale and then increase with excess air increasing, and achieve to minimum when excess air approaches 2.0. For aniline, the emission and conversion of NOx increase to a peak and then fall down with the growing excess air and achieve to maximum when excess air approaches 2.5.