Problem With Auger/ Auger Extension/ Coupling Grinding Coal

Stoker Coal Boilers automatically feed the coal and have controls and pumps just like any conventions boiler. They are intended to be used as a primary heat and often have domestic hot water coils as an added bonus. They can be set up independently or in dual sytem with your existing oil/gas boiler. They can accommodate both hot water base board or steam plumbing.
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LsFarm
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Stoker Coal Boiler: Axeman Anderson 260
Hand Fed Coal Boiler: Self-built 'Big Bertha' SS Boiler
Baseburners & Antiques: Keystone 11, Art Garland
Location: Michigan

Post Sun. Mar. 17, 2013 2:14 pm

Anyone have a photo of the correct 'ball' connector??

Berlin, Bill [bksaun] suggested on the phone that your auger to tube gap is way too large.
His auger to tube gap is 1/8" leaving 1/16" on each side of the auger flights.. yours is double that..

Personally I can't see any size or type of coal 'liking' to be pushed into a gap in the flights then being
picked up again by the next set fo flights. Each time it must grind up some more..

Berlin: can you compare the diameter, pitch and shaft size of the GJ auger to your Stokermatic or Combustioneer auger??

Greg L
Burning Pea/Buckwheat through an antique stoker [semi retired SSboiler],
Running an Axeman-Anderson 260M boiler burning Pea, About 150-250#per day
Farming, Fixing, Fabricating and Flying: 'spare time' what's that?

Pacowy
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Stoker Coal Boiler: H.B. Smith 350 Mills boiler/EFM 85R stoker
Coal Size/Type: Buckwheat/anthracite
Location: Dalton, MA

Post Sun. Mar. 17, 2013 5:51 pm

I don't have a GJ coupling, but I do have some dimensions from a new (i.e., unused since installed) GJ pot auger that might be of help. From the end of the flighting to the center of the pin hole is 3/4" and from the center of that hole to the end of the shaft is 3/8". If the dimensions on the end of the bin auger are the same, and if the coupling leaves no space between the two shafts, the gap in the flighting should be around 2.25".

Also, on all of the old school EFM couplings I have, the couplings are secured with pins with rounded/low profile heads.

Ideally. I think there should be more than 2 but less than 3 flights exposed beyond the end of the bin auger tube. Based on the flighting of the pot auger I have, 5" exposed could be a little too long. If the shaft of the bin auger gets trimmed a little, that could help both the exposure and the gap.

Mike

P.S. If any of this is useful, please thank Rob, who PM'd me about this issue.

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Short Bus
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Stoker Coal Boiler: Kewanee boiler with Anchor stoker
Coal Size/Type: Chestnut / Sub-bituminous C
Other Heating: Propane wall furnace back up only
Location: Cantwell Alaska

Post Mon. Mar. 18, 2013 1:14 am

Posibly the unworn auger is delivering more coal to the coupling than the used auger is taking away?
If it was as easy as burning oil, everybody would be burning coal.
Forum reality, If you ask wheres a good steak house? You will be informed that what you really want is pork chops.
Enjoy it for what it is worth.

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Berlin
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Hot Air Coal Stoker Furnace: Will-Burt Combustioneer 77B
Coal Size/Type: Ohio BITUMINOUS pea stoker coal
Location: Buffalo/Adirondacks, NY

Post Mon. Mar. 18, 2013 6:38 pm

Thanks everyone for the suggestions.

1. I will reduce the exposed length of the auger in the bin; I'll try three full flights.
2. The gap in the flights in the coupler is indeed close to 2.25"
3. Will try it with pins pressed in the coupler, not bolts.
4. I have a new, thicker, smooth auger extension pipe, will try that.
5. I have carefully inspected the stoker auger and it is in similar excellent shape to the extension auger.
6. the angle on the joint is only a few degrees; I will try it with the joint straight.

The measurements I posted initially were entirely wrong :oops2: . I have a number of different bit coal augers/auger tube measurements written down and somehow posted those NOT the measurements for the GJ stoker that I had questions about. The correct auger/tube measurements for THIS stoker are as follows:

stoker pipe - ID-2 1/4" auger - 2 1/8"

feed pipe (extension) 2 1/4" auger (extension) - 1 15/16"

If this doesn't work out, I may just get rid of this stoker and buy one that is a similar straight -through design with a larger (as close to 3" as possible) auger/auger tube. I would just use one of my bit stokers, but I'm trying to do a bin-feed setup.
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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Scottscoaled
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Stoker Coal Boiler: EFM 520, 700, Van Wert 800 GJ 61,53
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Coal Size/Type: Lots of buck
Other Heating: Slant Fin electric boiler backup
Location: Malta N.Y.

Post Mon. Mar. 18, 2013 6:46 pm

Why are your augers not the same diameter/pitch. That could cause all kinds of problems.
I think a man does what he can, untill his destiny is revealed. Right now that is trying to sell my EFM plate boilers in 520 and 700 sizes.

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LsFarm
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Stoker Coal Boiler: Axeman Anderson 260
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Location: Michigan

Post Wed. Mar. 20, 2013 11:03 am

Berlin: try reducing the exposed flights to 1 or 1 and a half.

Greg
Burning Pea/Buckwheat through an antique stoker [semi retired SSboiler],
Running an Axeman-Anderson 260M boiler burning Pea, About 150-250#per day
Farming, Fixing, Fabricating and Flying: 'spare time' what's that?

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Berlin
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Posts: 1847
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 Sun. Jun. 23, 2013 10:37 pm

UPDATE:

I was able to get the GJ stoker to feed buck ant. ok without excessive grinding. New bin pipe (smooth) and coupled straight to stoker pipe. No "coupler" on the outside of pipe, just butted the pipes together and used sheet metal and hose clamps to keep the pipe from moving or twisting. Still will not feed bit pea coal to the pot w/ out excessive grinding. I believe that the pot design itself is partly at fault. The opposing augers just under the retort rather than a slope for the coal to "flow" is contributing to the problem w/ bit coal IMO. Thus I've decided to replace it with an Allen stoker unit from Matt D. Picked it up two weeks ago and will be installing and testing within the next couple of weeks. Thanks again to those who contributed ideas; will be keeping this thread updated with final results.
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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