Feeder Speed for Coal mills.
Feeder Speed for Coal mills.
(OP)
I need some information on minimum feeder speed requirements for coal mills. Right now the minimum feeder speed on the mills is 20%. I would like to drop that to 15%. Could this create any problems when starting, or stopping a mill under normal operation? I could not find anything specific in NFPA 85.





RE: Feeder Speed for Coal mills.
RE: Feeder Speed for Coal mills.
1 To maintain a stable coal bed.
2 Maintain a max PA to fuel ratio in the PF lines for flame stability.
3 The PF piping system turndown depending of mill to fuel ratio control
These areas must be investigated to decide to reduce the feeder speed
RE: Feeder Speed for Coal mills.
We run 25% for minimum and move up quickly from there. Our burner flames are not stable (from the operator's point of view) without oil at that level.
RE: Feeder Speed for Coal mills.
What about your coal, Is your Volatile/coal ratio higher than 1.5 ?