Analysis of oxygen enriched combustion characteristic of 350 MW utility boiler based on computational fluid dynamics

摘要

Three dimensional model of 350 MW utility boiler furnace was established by CFD to explore the combustion characteristics of pulverized coal at different O2 / CO2 ratios. The temperature field, sub-concentrations distributions, burner wall heat loads and movement trajectories of pulverized coal particles were analyzed and compared with those in the air atmosphere. The numerical results shows: the furnace temperature increases as the value of O2 concentration and the peak value of radiation appears at 20 metres in furnace; Oxygen enrichment combustion process can effectively reduce the exhaust flue gas temperature; The combustion condition with 30 % oxygen concentration is the closest to air combustion.