摘要
Experiments have been conducted to investigate NO x concentration profiles along bed height and influences of temperature and excess air on NO x emission in the range from 700 ℃ to 900 ℃, when waste water containing 5% Hexamethylenediamine incinerated in a bench scale hot fluidized bed. The testing results indicate that the concentration of NO 2 is larger than that of NO along bed height except in the freeboard at 900 ℃, where NO, NO 2 concentrations are zero. Temperature and excess air play significant role on NO x emission. With increasing in temperature the NO x emission decreases very rapidly in the range from 700 ℃ to 900 ℃. With increasing in excess air, NO x emission increases considerably at 700 ℃, but it is almost independent of excess air at 800 ℃,and at 900 ℃ NO x emission is zero indicating that NH 2 from NH 2(CH 2) 6NH 2 has strong effect on de NO x with increasing in temperature and excess air. NO x concentration profiles decrease progressively with bed height because of reduction of NO x by NH 2. The mechanism of NO x formation and destruction is presented in the paper.
Experiments have been conducted to investigate NO x concentration profiles along bed height and influences of temperature and excess air on NO x emission in the range from 700 ℃ to 900 ℃, when waste water containing 5% Hexamethylenediamine incinerated in a bench scale hot fluidized bed. The testing results indicate that the concentration of NO 2 is larger than that of NO along bed height except in the freeboard at 900 ℃, where NO, NO 2 concentrations are zero. Temperature and excess air play significant role on NO x emission. With increasing in temperature the NO x emission decreases very rapidly in the range from 700 ℃ to 900 ℃. With increasing in excess air, NO x emission increases considerably at 700 ℃, but it is almost independent of excess air at 800 ℃,and at 900 ℃ NO x emission is zero indicating that NH 2 from NH 2(CH 2) 6NH 2 has strong effect on de NO x with increasing in temperature and excess air. NO x concentration profiles decrease progressively with bed height because of reduction of NO x by NH 2. The mechanism of NO x formation and destruction is presented in the paper.
