Run of mine coal

Does anyone have any information on what it is like to burn (Run of mine coal) in a biasi boiler or any hand fired boiler..I have coal with a lot of fines but if i pick out pieces 3 to 6 inch it seems to run good,I can get run of mine which is much larger but not sure how it would work...PS-the coal i am burning is bituminous....Thanks

Run-of-mine is different depending on how the coal is mined, the initial crusher, and the particulars of the coal itself. Some ROM has lots of fines and small sizes, some doesn't. With bit coal the largest sizes you can easily fit in your boiler are the best sizes to burn. When ROM is burned, often there are too many smaller sizes that pack around the larger ones thus obstructing air flow and causing very poor burns with certain coal. If you want to buy ROM and then pick out only the larger chunks (baseball size and larger) to burn in your boiler, you will probably be alright.

hers some more info.to read
Run of Mine