My friend 3 days ago got 1 ton of rice from uae Harmony and previously he used this coal as well as I in our EFM520's. and it burned excellent until he gave me a call to come check out what (the new coal from Harmony) is doing> the coal burned and created a clinker straight up off of the pot to the roof of the boiler like a huge popcorn ball
for the and outened the fire in the pot and jammed up the stoker mechanism and sheared the pins on the worm assmembly
after getting everything back to normal it did it again and again i> I get my coal in the summer to load up it makes me wonder if i should do that again i cant imagine shoveling 10 tons and having that problem. i think i might be looking for a new supplier also maybe blashack coal i know it is a litter more pricier but closer to my house and 35 more a ton seems to be worth the aggrivation of saving some money.
p.s. we also tried different settings and it keeps doing it the only thing u have to keep up is poking the clinker apart. and the grates and gaskets are fine this boiler is on the 5th ton ever burned in it.
my solution is to try maybe mixing blashack coal with it until the harmony coal is gone to control the fusing of ash. any solutions are welcomed