N'ihi ọbịbịa nke oyi na ụbara ọkụ ọkụ, ndị ọchịchị China agbanweela ikike mmepụta ọkụ ọkụ ụlọ iji chịkwaa ọnụ ahịa coal mgbe ọ na-abawanye ụbara coal. Ọdịnihu coal dara maka ugboro atọ n'usoro, mana ọnụ ahịa coke ka na-ebili. abawanyela n'ihu n'okpuru mmetụta a.
