Fellow Tech Forum members.

I have a few questions on Coal Quality that you may be able to help me with.
1) What effect does a change in the ratio between Free moisture and Inherent Moisture (moisture driven off at 105°C) have on the milling of coal? 
2) What is the optimum total moisture of milled coal as fired to the kiln? What are the rule of thumb min/max values that are considered best practice? What effect would running outside this range on both the low and the high end have?

Many thanks

Leo