engleski

Experimental and optimization study on NOx emissions of a full-scale industrial pulverized coal combustor with pre-combustion chamber

The increasingly stringent emission standards in China lead to lower emission requirements on the coal-fired industrial boilers, and it is difficult for the existing industrial boiler to meet the emission standards without the selective catalytic reduction (SCR) technology. This paper presents a new type of low-NOx coal- fired industrial burner. The effects of primary air ratio, secondary air ratio, swirl vane angle, FGR ratio and OFA ratio on the NOx emission. The results show that the NOx concentration gradually increases as the primary air ratio increases from 7.8% to 8.5%. As the inner secondary air ratio increases from 0.67 to 1.32, the NOx concentration gradually increases. The amount of NOx concentration decreases first and then increases with the angle of swirl vane increases from 30 ° to 60 °. The OFA ratio has a feeble influence on NOx, and the overall trend is to decrease first and then increase with increasing OFA ratio. The NOx concentration decreases and and the extent of decrease slows down as the FGR ratio increases from 0 to 13.3%. The NOx emission is 175 mg/m3 (9% O2) while the carbon in fly ash is 14.94 % and the boiler thermal efficiency is 91.7%.

NOx emission ; FGR ratio ; Pre-combustion chamber ; Low NOx burner ; Industrial boiler

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