Characteristics of Pyrolysis and Copyrolysis Products Sewage Sludge in Different Temperature Ranges

Table 3

Variance analysis results of pyrolysis orthogonal test (L934) (α = 0.05).

Factor	Sum of square of deviations	Freedom	F ratio	F critical value	Significance
Carrier gas flow rate a	16.487	2	8.800	6.940
Bed thickness b	0.020	2	0.011	6.940
Constant temperature time c	12.887	2	6.879	6.940