Relationship between Particle Size Distribution of Low-Rank Pulverized Coal and Power Plant Performance

Table 8

Difference in results between the two groups of tests.

	Average		𝑡-statistic	Significant difference?
	Coarser	Finer
Efficiency	0.2305	0.2375	3.44	Yes
Unburned carbon (fly ash)	3.1	1.53	4.6	Yes
Unburned carbon (bottom ash)	9.6	3.8	N/A	N/A
SO2	118	129	2.5	Yes
NOx	158	149	1.9	No
CO	1256	674	2.1	No