Abstract
The characteristics of flow,combustion,heat transfer and NOx emission were numerically investigated under the different load operation for a 3000 T/H ultra-supercritical boiler.The simulated results agree well with the measured values. The results show that there is significant influence when oxygen amount in flue gas is different. The results show that compared with the increase of oxygen,coal burnout rate increase,fly ash carbon content is reduced,combustion efficiency is raised,and NOx emissions is reduced greatly,the flue gas temperature is reduced greatly chamber exports,which helps reduce panel superheater hang the tendency of slag,wall maximum thermal load obvious move down to middle burner and the lower between the burner area,boiler oxygen best in between 3.0 and 3.5.The direction information can be provided for mastering the combustion characteristics of this type of boiler,adjusting and optimizing the operation by the research result.
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