Table 8. Overview of the Results under the Secondary Air Ratio Effects in Relation to the Key Parameters at the Exit of the Biomass Boiler.

parameters		Case 1-SA30%	Case R-SA40%	Case 2-SA50%
O2 (% dry)		2.62	2.62	2.64
flue gas temperature (K)		642	623	586
NOx emission (ppm, 6% O2)		141	116	90
UBC (wt %)	fly ash	1.50	1.54	0.76
	bottom ash	35.41	40.71	59.99
bottom ash release		269 kg/h	247 kg/h	402 kg/h
char conversion		97.36	97.33	97.16