Under the condition of coal charge with the same ratio of blending, the coke strength out of the sumitomo process is superior to that from NSC's.

Techno-economic indicators such as coke ratio equivalent and utilization factor have been improved based on finding charge rules of bell-less BF top, optimizing operating and adjusting tuyere layout.

And the facility methods of establishing and maintaining the funnel charge level by using additional coke or normal material charge and charge coke are put forward.