Smoke in Coal Bin

Re: Smoke in Coal Bin

PostBy: Rob R. On: Sun Jan 26, 2014 5:40 pm

I still can't comprehend why you are the only person that seems to have this issue. Regardless, you have not given up and have engineered a "fix". The principle is good, but the application is not.

I discussed this with a friend, and he pointed out that if you shear a pin (and the auger stops turning) the fire will chase the coal and air...right down the tube and past the edge of the base. It will melt your plastic fittings, and possibly start a fire or at a minimum fill the basement with fumes.
Rob R.
 
Stoker Coal Boiler: EFM DF520
Hand Fed Coal Stove: Hitzer 50-93
Other Heating: Dad's 1953 EFM Highboy

Re: Smoke in Coal Bin

PostBy: daluds On: Sun Jan 26, 2014 6:37 pm

Rob,

Wet fines dry and clog the 7 holes, then the pressure of the fan pushes the smoke down the tube and into the bin/house.

The Kimmel's coal I get in bags are wet, and I try to dry about 300lbs of coal before putting it into my bigger bin. I drain water from the bin and pre-bin, and wet vac a couple gallons for every 300lbs or so. Unfortunately, there is no other source of coal up where I live. I tried to buy a different brand, but they could not deliver until December so I went back to Kimmel's coal.

The only other thing I haven't changed is the upper/lower auger. I will try this later in the fall since these are expensive. I can disconnect the air feed to the pipe easily. I'll buy a new upper pipe if I get new coal source and augers next season. I can easily plug the top of the blower with 3/4" MIP plug since its tapped to go back to normal.

Draft is good. Pipes are new. Pot rebuilt last season. Once I clear the 7 holes in the upper pipe it runs normal so I know the cause, but don't know how to stop the 7 holes from clogging. I am sure its from the wet coal once the fines dry. Hopefully, I will be able to buy a different brand next year and have new augers.

Unfortunately, there are no EFM service guys in MA. I am not sure they can provide any more input than what I have already tried. BTW, this has never happen to the other EFM DF520 I run at my parents in PA. However, they get coal delivered dry and fills up bin which has 4-5 ton capacity in the basement.

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

Re: Smoke in Coal Bin

PostBy: stoker-man On: Sun Jan 26, 2014 8:37 pm

Rob brings up a valid point in the event of an outfire. An outfire control is shown in the manual and it shuts down the blower in the event the fire goes out. You just enter a temperature below which the boiler temp would not go with the fire going.

The shear pin looks like a nail and can be seen just behind the hairpin clip in this picture about one inch in from the left.

http://nepacrossroads.com/download/file ... &mode=view
stoker-man
 
Hand Fed Coal Boiler: 1981 efm wcb-24 in use 365 days a year
Coal Size/Type: Anthracite/Chestnut
Other Heating: Hearthstone wood stove

Re: Smoke in Coal Bin

PostBy: daluds On: Sun Jan 26, 2014 9:56 pm

Thanks - I do have the shear pin installed. I have the thermostat to shutdown the boiler when temp is below 130-140ish.
daluds
 
Stoker Coal Boiler: EFM DF520
Coal Size/Type: Rice
Stove/Furnace Make: EMF
Stove/Furnace Model: DF-520

Re: Smoke in Coal Bin

PostBy: daluds On: Wed Jan 29, 2014 9:14 am

I was also considering making a tool to clean out the 7 holes without taking the pipe out of the pot. Maybe a see saw type of tool with nail on the end to poke up to clear the holes? This would only require taking the pipe halves apart, and pull the upper auger.

After running with the the external hose a full day, I have found the coal is burning more (hotter) on the side where the feed pipe comes in. If I reduce the air flow into the top of the upper feed pipe it burns more evenly, but still more air on the inlet side.

I'll keep experimenting, but can always go back to normal operation. I'll look into replacing the PVC with metal parts if I keep this solution.

Thanks,

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

Re: Smoke in Coal Bin

PostBy: daluds On: Thu Jan 30, 2014 9:06 pm

The 1" air tube was too large, and making the right side of the pot (other side of coal inlet) not have enough air. I reduced the air tube to 1/2" and three holes in the feed pipe. Seems to provide more even air flow in the pot.

While fussing with the air, I notice my LF70A tempering valve was leaking so I went to shut off the water supply and the ball valve handle broke off completely. Seems every ball value of this brand is stuck open. All the Watts ball valves work great. Any suggestions on how to unstick these? They are Mueller Global (what junk). Can I fix the one I broke without replacing it?
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Routed 1/2" air tube down under boiler. Used 1/2" barb to 3/4" MIP elbow. Now can put on the blower cover.
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Routed 1/2" air tube under boiler with only 3 holes open in the pipe. Used 1/2" barb to 3/4" MIP in the cap.
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Ring looks more uniform with 1/2" hose and fewer holes.
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Valve handle broke off turning water off.
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Bin and Coal Drying
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Look! No SMOKE!!!
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daluds
 
Stoker Coal Boiler: EFM DF520
Coal Size/Type: Rice
Stove/Furnace Make: EMF
Stove/Furnace Model: DF-520

Re: Smoke in Coal Bin

PostBy: daluds On: Thu Feb 06, 2014 9:50 pm

Still working great! No smoke in the bin at all.

Upper pipe runs very cool with the air attachment.

Ashes are filling up even too.

So nice not to have to pull the boiler apart every month or smell the sulfur in the basement when those holes clog.

The EFM 520 is saving me a lot of money, and is a fun project.
daluds
 
Stoker Coal Boiler: EFM DF520
Coal Size/Type: Rice
Stove/Furnace Make: EMF
Stove/Furnace Model: DF-520

Re: Smoke in Coal Bin

PostBy: freetown fred On: Thu Feb 06, 2014 10:10 pm

As long as it's workin safely & your happy with the results. :)
freetown fred
 
Hand Fed Coal Stove: HITZER 50-93
Coal Size/Type: BLASCHAK Nut/Stove mix

Re: Smoke in Coal Bin

PostBy: daluds On: Sun Feb 09, 2014 7:28 pm

Works great! The upper feed pipe runs cool, and there is no sign of coal burning deeper in the pot. I'll keep monitoring it daily, but still looks good.

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

Re: Smoke in Coal Bin

PostBy: daluds On: Thu Aug 28, 2014 9:21 pm

Changed coal bags from Kimmels to Coal Contractors and no problems any more. Trying another brand this year.
daluds
 
Stoker Coal Boiler: EFM DF520
Coal Size/Type: Rice
Stove/Furnace Make: EMF
Stove/Furnace Model: DF-520

Re: Smoke in Coal Bin

PostBy: Lightning On: Fri Aug 29, 2014 10:55 am

Deep Purple anyone??

Smooooooke in the coal bin....
A fire in the stove..

:band:
:lol:
Lightning
 
Hand Fed Coal Furnace: Clayton 1537G
Coal Size/Type: Nut/Stove Size Mix