Hardin Help !!!

Stoker coal boilers and hot air furnaces and stoves using bituminous coal to heat your home or business. A stoker automatically feeds coal and combustion air
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wyowa
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Posts: 40
Joined: Mon. Oct. 12, 2009 11:29 am
Stove/Furnace Make: Hardin
Stove/Furnace Model: Automatic Coal Furnace/ stoker
Location: Douglas Wy

Post Sat. Jan. 23, 2010 6:04 pm

Stove slagged up and pushed ring off of auger drive, I had slowed feed rate down for finer coal. had air draft less than a 1/4 open. will it help to open up draft more. Lost some eyebrow and hair when I opened the door to clean ashes. also found elbow was partially plugged.now cleand
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slag ring.jpg

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rockwood
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Posts: 1371
Joined: Sun. Sep. 21, 2008 7:37 pm
Hot Air Coal Stoker Furnace: Stokermatic coal furnace
Hand Fed Coal Stove: Rockwood Stoveworks Circulator
Baseburners & Antiques: Malleable/Monarch Range
Coal Size/Type: Soft coal: Lump and stoker (slack coal)
Location: Utah

Post Sat. Jan. 23, 2010 10:23 pm

I don't have hands on experience with stokers with rotating ring/elevated retort like yours but I think there's to much fine coal and with the feed rate slowed you get excessive clinker because ash/clinkers aren't pushed out of the retort before they fuse together and push the ring up. I think increasing the air would create even more clinkers. You may want to consider screening fines out til you get coal with no more than 25% fines. Any coal smaller than 1/4 inch I would consider as "fines" and soft coal stokers use 1/4 to 1 1/4 inch coal.
What percentage fines is there in your coal?
"None are more hopelessly enslaved than those who falsely believe they are free." -Goethe

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wyowa
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Posts: 40
Joined: Mon. Oct. 12, 2009 11:29 am
Stove/Furnace Make: Hardin
Stove/Furnace Model: Automatic Coal Furnace/ stoker
Location: Douglas Wy

Post Sun. Jan. 24, 2010 5:14 am

guess I will have to screen, this last load is really high in fines over 25 percent I guess. I did turn feed rate back up some and cleaned stove and chimney.
i have not checked it yet today. will post when I do. thanks

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wyowa
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Posts: 40
Joined: Mon. Oct. 12, 2009 11:29 am
Stove/Furnace Make: Hardin
Stove/Furnace Model: Automatic Coal Furnace/ stoker
Location: Douglas Wy

Post Sun. Jan. 24, 2010 8:58 am

burning much better so far with the higher feed rate. Has appeared to have burned the buildup off the inside of stove. Had carbon sparks out of top of chimney for a bit this morning,


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steinkebunch
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Posts: 174
Joined: Thu. Feb. 15, 2007 3:01 pm
Stove/Furnace Make: Homemade Bituminous Hand-Fed
Stove/Furnace Model: Prill underfed stoker Model M8
Location: Wyoming

Post Sun. Jan. 24, 2010 5:07 pm

I noticed on my Prill that when I slowed the feedrate down, I got more clinkers. Good thing in my case, as it melted ash and reduce the volume, but it still falls into the ash pan and doesn't cause a problem. Reduce my ash hauling by about 1/2. But in your case, it didn't work that way.

I noticed that when I have more fines (get to the bottom of the bin, etc) I seem to get a hotter fire.

I wonder - if you are getting enough heat out of the lower feed rate, it's probably more efficient than the higher feed rate. Might be worth trying to get the lower feedrate to work.

If you could rotate the ash ring faster but maintain the same feed rate, maybe you could break the clinkers up before they cause any problems. Problem is that the auger runs the ring, so slowing the feedrate automatically slows the ring rotation. Only thing is that some stokers only rotate the ring one cog per auger revolution, some rotate it two cogs per auger revolution. If your's is the former, you could modify it to rotate twice as often.

Just some ideas.

Good luck

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wyowa
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Posts: 40
Joined: Mon. Oct. 12, 2009 11:29 am
Stove/Furnace Make: Hardin
Stove/Furnace Model: Automatic Coal Furnace/ stoker
Location: Douglas Wy

Post Thu. Jan. 28, 2010 8:14 pm

Hi, I started screening coal . first in a chicken wire screen then in a 1/4 inch mesh . Hand breaking anything larger than about an 1 1/4 in size. question is what to do with fines,I now have a 55 gallon barrel full with no idea what to do with them. Any ideas.
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coal1.jpg
coal out of truck
coal2.jpg
first screening with chicken wire
coal3.jpg
1/4 inch screening

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Berlin
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Joined: Thu. Feb. 09, 2006 1:25 pm
Hot Air Coal Stoker Furnace: Will-Burt Combustioneer 77B
Coal Size/Type: Ohio BITUMINOUS pea stoker coal
Location: Buffalo/Adirondacks, NY

Post Thu. Jan. 28, 2010 9:38 pm

for the price you pay for coal, i'd use them to fill depressions in the yard - they're not good for much else. perhaps you can try selling them back to the mine :P

a few years ago when I was screening coal for my stoker (I wanted to use up larger sizes that I had before I bought stoker size) I crushed what I had by putting it in rows in my driveway and driving my diesel pickup tires over them. then to screen it I took 1" mesh, rolled it into the size of a 55 gal drum, framed it w/ 2/2's and put a rebar shaft down the middle, and a hand crank on the end, it was sloped @ about 15º. this allowed me to shovel the coal into it, screen it into one wheelbarrow, and have the pieces too large to fit through the screen drop out the other end into another wheelbarrow; worked well. since your getting coal that needs to be screened, you might want to set something like this up, only perhaps w/ an electric motor and a dryer belt to spin it if you want it to be an easy/quick one man operation.
Burning western Pennsylvania Bituminous in WNY using model 77 stoker furnace. BITUMINOUS equiptment: 2 hand fired stoves of my own design, Many Combustioneer Model 77 stokers, stokermatic furnace, Many Will-Burt stokers, & and Two Iron firemen.

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