Abstract
ABSTRACTA 3D computational fluid dynamic (CFD) simulation is performed on a 35t/h grate boiler to investigate the compound combustion, consisting of grate firing of lump coal on the fire grate and suspension combustion of pulverized coal sprayed in the middle of the stoker. A grate boiler-based low-nitrogen combustion method is proposed in the present study. The influences of this technology on the boiler temperature field and flue gas components as well as NOxare studied by comparing two different combustion modes before and after the transformation. Results show that the compound combustion technology can significantly improve the boiler efficiency and reduce the NOx concentration at the outlet. Therefore, the proposed method may have favorable applications in different industries. It is found that the boiler NOx emission can reach an optimal status, when the pulverized coal feed rate of the burner and the proportion of pulverized coal are set to 20m/s and 20%, respectively. It is observed that when the forward spinning arrangement form is adopted, the emission can be reduced up to 58.08%. The NOx at the outlet of a 35t/h boiler was reduced by 35.71% after retrofitting, which is in consistency with the obtained results.
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