chambers, coal grinding equipment has been around for many years. Ball mills are usually used and can be sized as needed, the final product is like talcum powder. I think waste heat from the boiler is used to reduce moisture. I can't see that it's practical to use a KDS except for extremely small operations. Static electricity may be a problem with the KDS since the coal powder is explosive. Just my semi-educated opinion! LOL!
Cash is King until further notice!!!
My comments on companies are usually my opinion of long term success (years). The PPS may go up or down greatly in the meantime depending on the number of greedy suckers with money.