TY - JOUR
TI - Numerical simulation of NOx emission characteristics during combustion in 350 MW supercritical cogeneration tangentially boiler
AU - Wang Wei-Shu
AU - Huang Zhi-Hao
AU - Tian Miao
AU - Wang Ji-Hong
AU - Shangguan Shan-Shan
AU - Yao Ming-Yu
JN - Thermal Science
PY - 2020
VL - 24
IS - 5
SP - 2717
EP - 2728
PT - Article
AB - In light of a 350 megawatt supercritical cogeneration tangential boiler, the  combustion and the nitrogen oxides release mechanism in the furnace were  numerically simulated. The combustion characteristics were analyzed, and  the influencing factors, such as the pulverized coal concentration, the  velocity of separated over-fire air and the boiler load, on nitrogen oxides  release in the furnace were also systematically studied. The results show  that the central airflow in the furnace rises spirally, and an inverted “V”  type temperature distribution is formed. The generation of nitrogen oxides  can be effectively restrained by increasing the concentration of pulverized  coal properly. Compared with the conventional concentration, the  concentration of nitrogen oxides at the furnace exit can be reduced by  29.63% by taking high pulverized coal concentration. The concentration of  NOx at the furnace exit can be drastically reduced by increasing the  velocity of separated over-fire air. When decreasing boiler load, the  concentration of NOx at furnace exit declines at first and then increases.