[Retracted] Kinetics of Sludge Superheated Steam Drying and Optimization of Process Parameters

Table 8

Fitting parameter and results from the logarithmic model under different drying conditions.

Fixed factor condition	Variable factor condition	Model coefficients	R^2	χ^2 ×10^−4	RMSE ×10^−3
6 mm, 22 m^3/h	180°C	a = 1.90262, k = 6.56429 × 10^−4, and b = −0.65808	0.9957	0.326	5.71
	195°C	a = 1.72213, k = 8.21507 × 10^−4, and b = −0.51401	0.9997	0.228265	4.78
	220°C	a = 1.71767, k = 0.00111, and b = −0.44029	0.99973	0.207048	4.55
	260°C	a = 1.70801, k = 0.00133, and b = −0.46258	0.99924	0.582682	7.63
220°C, 22 m^3/h	2 mm	a = 2.22072, k = 0.00172, and b = −0.9725	0.99977	0.173039	4.16
	3.5 mm	a = 1.93788, k = 0.00117, and b = −0.6802	0.999874	1.0211	10.1
	6 mm	a = 1.64436, k = 0.00111, and b = −0.38803	0.99852	1.17649	10.85
	10 mm	a = 1.52454, k = 9.04004 × 10^−4, and b = −0.29954	0.99944	0.424216	6.51
220°C, 6 mm	22 m^3/h	a = 1.77499, k = 7.2396 × 10^−4, and b = −0.5898	0.99965	0.265167	5.15
	29 m^3/h	a = 1.69364, k = 0.00101, and b = −0.457	0.99948	0.392325	6.26
	36 m^3/h	a = 1.63835, k = 0.0012, and b = −0.43739	0.9995	0.389692	6.24
	40 m^3/h	a = 1.6045, k = 0.00148, and b = −0.36632	0.99885	0.918012	9.58

Note. a, k, and b are fit parameters.