Characteristics of Corrosion Related to Ash Deposition on Boiler Heating Surface during Cofiring of Coal and Biomass

Table 5

Fitting correlations of corrosion mass gain under different proportion of straw biomass blended to coal for metal samples coated with ash.

Proportion of straw biomass blended to coal (%)	Fitting correlations (ΔG = kτ^1/2 + C)	k	R^2
100	ΔG = 1.2737τ^1/2 − 1.6477	1.2737	0.9945
70	ΔG = 0.3913τ^1/2 − 0.2843	0.3913	0.9967
50	ΔG = 0.3992τ^1/2 − 0.3659	0.3992	0.9975
20	ΔG = 0.2221τ^1/2 − 0.1707	0.2221	0.9894
0	ΔG = 0.1906τ^1/2 − 0.2145	0.1906	0.9969
No fuel ash	ΔG = 0.1695τ^1/2 − 0.1980	0.1695	0.9862