I Have an EFM DF 520 coal stoker boiler heating abouy 50% of my 10,000 sq ft 100 year old B&B in NW new Jersey. I was previously burning 3000 gals of oil per season, now I am using about 15 tons of coal/yr. I am very happy with my boiler but have resorted to burning buckwheat coal as my only supplier who delivers, only stocks that, no rice, unfortunately. I inted to build a larger bin and get 23 tons at a time by triaxle for next winter. In the meantime I am going thru 5 or more shear pins a week. I am assuming this is because of the size and hardness of the coal. Could there be another issue at play? Might I have compacted fines in the stoker tube worsenig this problem? I will make it thru the season but this is a nuisance as the system quits too often.
Could I upgrade the shear pin and what is the downside of that?
I am also making an auger type ash removal system with an 8 foot screw from Egan Co. and a small 60 rpm gear reduced electic motor..