Possibly for a certain rank of coal, applying coal blending and making proper enlargement on particle size are of effective means for increasing BF coal rate and replacement ratio of coal.

• 采用混合喷吹和对一定煤种适当扩大煤粉粒径，尤其是烟煤的粒径，可能是进一步提高喷煤量和置换比的有效措施。