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

Table 9

Difference between the feed coal (pulverized, as received) quality for the two groups of tests.

	Average		𝑡-statistic	Significant* difference?
	Coarser	Finer
Ash (%)	14.15	14.98	1.28	No
Volatile content (%)	38.43	38.22	0.37	No
Volatile content^RC (%)	32.5	31.5	1.66	No
Moisture (%)	15.2	17.35	N/A	N/A
Moisture^RC (%)	27.1	30.6	MWT	Yes
Heat Val, kJ/kg (BTU)	19,337 (8320)	18,774 (8078)	4.1	Yes
Fixed carbon content	32.3	29.5	N/A	N/A
HGI	34	37.8	3.8	Yes

*At 95% confidence, RC: raw coal, MWT: Mann-Whitney test [11].