The blast-cups have local effects on the coke descent and have little effects on whether the cokes flow smoothly or net in case that coke bed has enough height.

• 风帽对焦炭下降的影响是区域性的，当料层高度足够时，各种下降条件下风帽的选择不会使焦炭的下降均匀性及顺畅性产生本质的变化。