People are starting to ask more about coal with #1 oil up over 4$ and coal at 65$ per ton, 40 miles away, at 7500btu/pound, chestnut size about 1 1/2".
Traditional stokers for this coal start at 5k and need another 10K for a boiler, then we need to put hydronics in the house, even if it is just a heat exchanger in the air duct.
Hand fed with this coal is a smoky proposition, and we already have one hand outdoor boiler smugging up the valley. The warm morning stoves look good but still will smudge and with close neighbors this could be a problem, we need a cleaner introduction to burning coal, my underfeed Will Burt style stoker is clean burning.
We have access to small coal about 3/8" and under, real close to rice with a signifigant percentage of fines.
I realize these stokers are all listed as anthricite only, but some sell in Wyoming, and my underfed stoker looks alot like the Harmon feeder, and the "modern" rotating grate is alot like the sloped grate feeders.
The relativly low cost stokers that use rice and barley sized coal seem appealing.
Coal with fines hold to much water, and gum up the feeder with coal paste.
Sub bituminous coal will clinker and pull the fire off the grate, only about half my combustion product is clinker.
Find one of these relativly low cost used stokers that will work with this coal, install it in a shop or garage for a test run with the coal available, fines and all.
Which of these stokers is most likely to tolerate the most fines?
Feel freee to vote, twice, as there may be more than one answer.
Coments about how moisture and subituminous coal will effect these stokers are also welcome.
I realize to achive rated BTU input thest units will need to be fed at maximum speed or stroke.
Last edited by Short Bus
on Mon Jan 07, 2013 8:10 pm, edited 1 time in total.