Best Rice or Barley Sized Coal Stoker to Tolerate Fines?

A Coal stoker furnace or stove controls most operations including automatically feeding the coal. They are quite similar to any conventional oil and gas units and easily operated for extended periods of time. They commonly use rice coal but may use larger sizes like buckwheat. They can be used as primary heat, supplementary heat or have a dual set up with your existing oil/gas furnace.
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Which one of these stokers is most likely to tolerate the most fines?

Poll ended at Wed. Feb. 06, 2013 6:28 pm

Liesure Line
0
No votes
Keystoker
3
38%
Harman
0
No votes
EFM
5
63%
 
Total votes: 8

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Short Bus
Member
Posts: 510
Joined: Sun. Jan. 10, 2010 12:22 am
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. Jan. 07, 2013 6:28 pm

History;
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 Harman 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.

Percived problem;
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.

Solution;
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.

Question;
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 7:10 pm, edited 1 time in total.
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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Scottscoaled
Member
Posts: 2597
Joined: Tue. Jan. 08, 2008 9:51 pm
Stoker Coal Boiler: EFM 520, 700, Van Wert 800 GJ 61,53
Baseburners & Antiques: Magic Stewart 16, times 2!
Coal Size/Type: Lots of buck
Other Heating: Slant Fin electric boiler backup
Location: Malta N.Y.

Post Mon. Jan. 07, 2013 6:49 pm

While they are not as much as the stokers/boiler combo prices you were quoting, EFM's comand a fair price. The 700, 900, and 1300 boilers would really shine with there rotating pot and auger system. There isn't that much sub bituminous down here to try them out on so it would be a crap shoot. I would say that between them and the larger rotating pot Van Wert series of stokers, you would have the best luck. With the rotating pot, it would be nothing to install a knife edge to trim the clinkers off the side. The EFM machines burn 30-45 lbs of material at a 80% efficiency rate. The Van Werts burn more. Older conversion stokers would work well for your applications also.
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.

User avatar
Short Bus
Member
Posts: 510
Joined: Sun. Jan. 10, 2010 12:22 am
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. Jan. 07, 2013 7:06 pm

I agree that the EFM boilers are great, and worth the money.
These rotating ring stokers are mostly large and comand top dollar, for good products, but helping somone find a used or new unit, then helping them mate it to a used or new boiler, then adding a hydronic system to the house is a tall order, and problaby makes more heat than is needed and consumes alot of precious shop space.
I'm shooting for simple yet stoker.
If we can get some stoker stoves working reliably around town we can move to better systems.
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.


User avatar
LsFarm
Member
Posts: 7385
Joined: Sun. Nov. 20, 2005 8:02 pm
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 Mon. Jan. 07, 2013 10:25 pm

I don't believe you will be able to use a keystoker or Harman or Leisure line flat bed stoker with Bit or Sub-bit coal.,

only an underfeed stoker like an EFM will tolerate this type of coal.

An old prill or other rotating pot underfed stoker is best, like the bigger EFM's.

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?

User avatar
Scottscoaled
Member
Posts: 2597
Joined: Tue. Jan. 08, 2008 9:51 pm
Stoker Coal Boiler: EFM 520, 700, Van Wert 800 GJ 61,53
Baseburners & Antiques: Magic Stewart 16, times 2!
Coal Size/Type: Lots of buck
Other Heating: Slant Fin electric boiler backup
Location: Malta N.Y.

Post Tue. Jan. 08, 2013 8:01 am

You should contact Matt D. He just posted a slew of underfeed rotating pot stoker units. They can be adapted to furnaces or boilers. :)
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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