More Air Out of Right Side of Pot

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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Rob R.
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Stoker Coal Boiler: EFM DF520
Hand Fed Coal Stove: Hitzer 50-93
Coal Size/Type: Lehigh Rice
Other Heating: Dad's 1953 EFM Highboy
Location: Chazy, NY

Post Fri. Dec. 14, 2012 10:43 pm

You need to get a second drum or a small bin to "stage" the coal in and dry it out...orherwise you will continue to have problems.

daluds
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Stoker Coal Boiler: EFM DF520
Coal Size/Type: Rice
Stove/Furnace Make: EMF
Stove/Furnace Model: DF-520

Post Thu. Dec. 20, 2012 11:59 pm

I'll have to figure out how to drain the bags before I put them in the coal bin. Need to screen the coal before I put it in the bin.

Here is the rebuilt pot after getting some rope gasket:

Thanks,

Dave
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Rob R.
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Joined: Fri. Dec. 28, 2007 4:26 pm
Stoker Coal Boiler: EFM DF520
Hand Fed Coal Stove: Hitzer 50-93
Coal Size/Type: Lehigh Rice
Other Heating: Dad's 1953 EFM Highboy
Location: Chazy, NY

Post Fri. Dec. 21, 2012 2:40 am

Nice job. Did you ever get a new pot auger?

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daluds
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Stoker Coal Boiler: EFM DF520
Coal Size/Type: Rice
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Stove/Furnace Model: DF-520

Post Fri. Dec. 28, 2012 11:57 pm

DF520 is running again. Switched over from oil back to coal today.

I rebuilt the pot, cleaned the chimney flue, cleaned the smoke pipes, cleaned inside the boiler, replaced the lower pipe, extended the lower pipe so only 3 to 4 inches of the auger extended into the coal pile instead of 8-10 inches, drilled bigger drainage holes in the bottom of the coal bin, updated the coal bin with bird house over the pipe made from cinder block like in manual, removed the draft inducer, and cleaned the blower.

The air flow is even out of the pot, the coal burns like it did when new, and I am not getting any smoke in the coal bin.

I'll check it again tomorrow, but appears to be working again.

Thanks for everyone's help!

Dave

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stoker-man
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Hand Fed Coal Boiler: 1981 efm wcb-24 in use 365 days a year
Coal Size/Type: Anthracite/Chestnut
Other Heating: Hearthstone wood stove
Location: Lehigh Valley, PA

Post Sat. Dec. 29, 2012 7:42 am

daluds wrote: I am not getting any smoke in the coal bin

That could be the result of:
daluds wrote: cleaned the chimney flue, cleaned the smoke pipes, cleaned inside the boiler,
daluds wrote:The air flow is even out of the pot, the coal burns like it did when new
That could be the result of:
daluds wrote:I rebuilt the pot
daluds wrote:cleaned the blower
You've touched all the bases, but haven't quite pinpointed the original problem. Glad to hear you're up and running again.
‹(•¿•)›

daluds
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Posts: 282
Joined: Fri. Jun. 20, 2008 9:27 am
Stoker Coal Boiler: EFM DF520
Coal Size/Type: Rice
Stove/Furnace Make: EMF
Stove/Furnace Model: DF-520

Post Tue. Jan. 01, 2013 8:14 pm

I suspect the plates were loose allowing air out between the plates and top/bottom. There may have been a clump of dried fines preventing circular flow of air based on the pictures I took, so those would be my first guess. I also think the worm was too long in the bin causing excessive fines when it was full adding to the problem.

I created a "roof" on top of the pipe like the manual shows, but don't believe this is necessary and its causing uneven flow of coal in the bin so I have to keep it full. Make take this out, and just run with the shorter exposed worm from the pipe.

Dave

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daluds
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Posts: 282
Joined: Fri. Jun. 20, 2008 9:27 am
Stoker Coal Boiler: EFM DF520
Coal Size/Type: Rice
Stove/Furnace Make: EMF
Stove/Furnace Model: DF-520

Post Thu. Jan. 03, 2013 12:13 am

Rob R. wrote:You need to get a second drum or a small bin to "stage" the coal in and dry it out...orherwise you will continue to have problems.
I'll try this tomorrow. Switched back to oil again after having a lot of smoke pushed back into the coal bin, and coal not burning in the pot correctly. It was doing fine with dry coal so I'm assuming its due to the wet cold coal clogging up the operation.

However, I'm stumped. I'll check the blower too.

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Rob R.
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Joined: Fri. Dec. 28, 2007 4:26 pm
Stoker Coal Boiler: EFM DF520
Hand Fed Coal Stove: Hitzer 50-93
Coal Size/Type: Lehigh Rice
Other Heating: Dad's 1953 EFM Highboy
Location: Chazy, NY

Post Thu. Jan. 03, 2013 1:31 pm

The wet coal is likely the source of all your problems. A large piece of coal or wood can also cause the auger to run empty and let gas blow back into the bin.

The blower is pretty simple...if it spins counterclockwise when viewed from the gearbox and isn't full of dirt/dust, it is probably fine.

daluds
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Posts: 282
Joined: Fri. Jun. 20, 2008 9:27 am
Stoker Coal Boiler: EFM DF520
Coal Size/Type: Rice
Stove/Furnace Make: EMF
Stove/Furnace Model: DF-520

Post Sun. Jan. 06, 2013 10:00 pm

Rob,

I picked up another "bin" to hold bags of coal to let them unfreeze and drain. I place the bags upright and cut small holes in the bottom corners of the bags and let them sit over night. The second bin is an inexpensive green xmas tree container, and holds 5 50lb bags upright. The first batch of 5 bags produced just short of 5 gallons of water which I measured by pouring into empty milk containers.

The DF520 is burning much better with the less wet coal now, but will keep checking it since I have started to dry out the coal before putting in the coal bin.

This seems like a science project. :-) However with the green second bin, I can now say I burn "green" coal.

EFM should offer a coal drying attachment similar to the salad drying mechanism:

Image

So it appears the uneven burning is due to wet coal building up on the far side of the pot from the feed pipe too. Thanks for all the help and suggestions.

Dave

daluds
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Posts: 282
Joined: Fri. Jun. 20, 2008 9:27 am
Stoker Coal Boiler: EFM DF520
Coal Size/Type: Rice
Stove/Furnace Make: EMF
Stove/Furnace Model: DF-520

Post Wed. Jan. 09, 2013 10:56 pm

EFM running great now with dryer coal...

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