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

Table 2

Major ash constituents in fuels (%).

Fuel	K	Na	Ca	Mg	Al	Si	Fe
Straw	1.96	0.78	0.84	0.072	1.69	1.83	0.17
Corn stalk	1.88	0.64	1.20	0.069	3.16	2.24	0.16
Cotton stalk	0.86	0.35	0.84	—	1.65	0.51	0.25
Bitumite	0.081	0.11	1.05	0.50	15.87	21.71	3.99
Lean coal	0.098	0.16	1.61	0.86	15.38	24.36	5.66