Ash Evaluation of Indonesian Coal Blending for Pulverized Coal-Fired Boilers

Table 1

Chemical composition of coal.

		KT	SS	KP	TK	KS	BD-1A	BD-1B	BD-2A	BD-2B	BD-3A	BD-3B	BD-4A	BD-4B
Total ash	adb	5.24	7.36	6.14	6.43	2.18	6.30	6.30	5.69	5.69	5.84	5.84	3.71	3.71
Total sulfur	adb	0.71	0.36	0.50	0.20	0.13	0.54	0.54	0.61	0.61	0.46	0.46	0.42	0.42
Gross energy	Ar	5,256	4,889	5,229	4,198	4,923	5,073	5,073	5,243	5,243	4,727	4,727	5,090	5,090
AFT red	Deformation	1,130	1,200	1,160	1,120	1,160	1,120	1,180	1,100	1,110	1,140	1,130	1,130	1,110
	Spherical	1,140	1,300	1,170	1,130	1,170	1,210	1,220	1,110	1,120	1,160	1,140	1,150	1,120
	Hemisphere	1,160	1,320	1,220	1,160	1,200	1,230	1,250	1,120	1,160	1,180	1,180	1,160	1,140
	Flow	1,200	1,340	1,240	1,180	1,220	1,260	1,280	1,160	1,200	1,200	1,200	1,170	1,180
AFT oxy	Deformation	1,160	1,220	1,230	1,230	1,220	1,180	1,200	1,140	1,140	1,180	1,200	1,150	1,140
	Spherical	1,170	1,330	1,250	1,250	1,250	1,230	1,260	1,160	1,200	1,230	1,240	1,180	1,190
	Hemisphere	1,180	1,340	1,280	1,260	1,260	1,260	1,280	1,180	1,240	1,240	1,250	1,240	1,240
	Flow	1,320	1,400	1,300	1,300	1,300	1,280	1,300	1,220	1,260	1,260	1,260	1,280	1,260
Ash composition	SiO2	44.97	68.78	52.74	35.83	33.32	56.88	51.61	48.86	45.38	40.40	43.79	39.15	45.10
	Al2O3	12.84	16.03	20.19	18.24	12.00	14.44	20.78	16.52	16.74	15.54	18.34	12.42	15.78
	Fe2O3	9.04	3.36	7.35	14.02	13.95	6.20	7.05	8.20	9.86	11.53	11.91	11.50	9.84
	CaO	9.85	3.14	5.19	18.65	16.25	6.50	5.08	7.52	9.12	14.25	11.52	13.05	10.4
	MgO	3.20	1.46	3.44	4.64	10.10	2.33	2.38	3.32	3.41	3.92	2.66	6.65	4.12
	TiO2	0.45	0.48	0.64	0.63	0.66	0.465	0.61	0.55	0.58	0.54	0.65	0.56	0.64
	Na2O	4.29	3.36	2.83	0.50	2.99	3.83	4.18	3.56	3.82	2.40	2.10	3.64	3.50
	K2O	0.99	0.59	2.04	0.62	0.86	0.79	0.97	1.52	1.31	0.81	0.86	0.93	1.30
	Mn3O4	0.066	0.058	0.042	0.348	0.176	0.062	0.064	0.054	0.057	0.207	0.345	0.121	0.071
	P2O5	0.216	0.222	0.292	0.085	0.144	0.219	0.596	0.254	0.364	0.151	0.198	0.180	0.394
	SO3	13.85	2.28	5.02	6.22	9.35	8.07	6.42	9.44	9.20	10.04	7.50	11.60	8.68