Abstract
The characteristics of flow, combustion, heat transfer and NOx emission were numerically investigated under the different load operation for a 1 000 MW ultra-supercritical swirling opposed coal-fired utility boiler. The simulated results agree well with the measured values. The results show that compared with the increase of oxygen, pulverized coal burnout rate increase, fly ash carbon content is reduced, combustion efficiency, and NOx emissions 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.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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