Date:

2025-04-30

Title of Paper:

Effect of Two-level Over-fire Air on the Combustion and NOx Emission Characteristics in a 600 MW Wall Fired Boiler

Journal:

Numerical Heat Transfer, Part A: Applications

Summary:

This paper accomplishes a numerical investigation on the effect of two-level over-fire air
(OFA) on the combustion and NOx emission in a supercritical 600MW wall-fired boiler.
Different arrangements of two-level OFA nozzles and different airflow ratios between the
two layers are set to examine NOx emission and the carbon content in fly ash. According
to the simulation results, the two-level OFA case releases the NOx between the single upper
layer and the single lower layer of the two-level OFA nozzles in operation. Moreover, the
two-level OFA arrangement gives a lower carbon content in fly ash than the single-level
OFA cases. In addition, both low NOx emissions and low carbon content in fly ash can be
obtained simultaneously when the two levels of OFAs are injected from Layers 1 and 4 with
rlower at 0.5.

Co-author:

Hu Liu, Lei Zhang, Hua Zhu, Li Nie, Defu Che

Translation or Not:

No

Date of Publication:

2014-12-26