Table 3. Changes of Light and Heavy Components after Tar Cracking.

	calcination power
	coal	PC	HPC	ZHPC-45W	ZHPC-60W	ZHPC-75W
light component (g)	0.3551	0.4390	0.4537	0.3551	0.3693	0.3740
heavy component (g)	0.9689	0.7620	0.5512	0.2813	0.2535	0.3123
light component ratio (%)	26.8	36.55	45.15	57.01	59.30	54.50