| 摘要 |
Provided is a catalyst feeder which includes: a hollow type cylinder connected to a catalyst injecting pipe and a catalyst discharging pipe; and a rotary valve which is a rotary piston having, on the circumferential surface, different sizes of grooves where catalysts can be filled, and which is provided in the way that one of the grooves corresponds to the end parts of the catalyst injecting pipe and catalyst discharging pipe connected to the hollow type cylinder depending on the position that the rotary piston is rotated and translated in the hollow type cylinder. |
