Feed Rate

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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billw
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Stove/Furnace Make: EFM 520
Stove/Furnace Model: GOODBYE OIL COMPANY
Location: Dallas, PA

Post Sun. Jan. 11, 2009 6:07 pm

I was playing with my feed rate since installing my 520. I found 3 teeth works for fall weather. I switched to 4 teeth towards the end of November. With this sub 0 weather on it's way do you think I should be moving to 5 teeth? I won't be home during the day to tell if the system is running constantly so I'm thinking the day before the extreme cold gets here I may just bump it up another notch.

Have any of you experienced owners made adjustments like this or do you just set it at one rate and leave it for the winter?

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coal berner
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Joined: Tue. Jan. 09, 2007 12:44 am
Stoker Coal Boiler: 1986 Electric Furnace Man 520 DF
Stove/Furnace Make: Electric Furnace Man
Stove/Furnace Model: DF520
Location: Pottsville PA. Schuylkill County PA. The Hart Of Anthracite Coal Country.

Post Sun. Jan. 11, 2009 6:26 pm

billw wrote:I was playing with my feed rate since installing my 520. I found 3 teeth works for fall weather. I switched to 4 teeth towards the end of November. With this sub 0 weather on it's way do you think I should be moving to 5 teeth? I won't be home during the day to tell if the system is running constantly so I'm thinking the day before the extreme cold gets here I may just bump it up another notch.

Have any of you experienced owners made adjustments like this or do you just set it at one rate and leave it for the winter?
You already know what my answer will be. 4 is enough but if you want to add 2.5 lbs more Per hr go right ahead. The air
at 5 teeth is 4.5
J.C.

Heating house & water with a 1986 electric furnace man DF520 using buckwheat Anthracite coal

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Pa Dealer
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Joined: Fri. Aug. 15, 2008 10:12 am
Stoker Coal Boiler: EFM 520 DF
Coal Size/Type: Rice
Other Heating: Keystoker
Stove/Furnace Make: EFM DF 520
Stove/Furnace Model: Keystoker
Location: NEPA

Post Sun. Jan. 11, 2009 6:48 pm

At four teeth your net BTU's are 74670, at five teeth net BTU's are 93340 not knowing the square feet of what you are trying to heat, and domestic coil demands five teeth 4 1/2 air is good for most situations.

R.Y

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cArNaGe
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Location: Montrose, PA
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Post Sun. Jan. 11, 2009 7:03 pm

I'm at 6 teeth/ 5.5 air.
My Air Handler is 135,000 btu.
I ran it at 4 teeth but it would drop the boiler temp.
My boiler only runs when my air handler runs.

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coal berner
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Posts: 3591
Joined: Tue. Jan. 09, 2007 12:44 am
Stoker Coal Boiler: 1986 Electric Furnace Man 520 DF
Stove/Furnace Make: Electric Furnace Man
Stove/Furnace Model: DF520
Location: Pottsville PA. Schuylkill County PA. The Hart Of Anthracite Coal Country.

Post Sun. Jan. 11, 2009 7:40 pm

Pa Dealer wrote:At four teeth your net BTU's are 74670, at five teeth net BTU's are 93340 not knowing the square feet of what you are trying to heat, and domestic coil demands five teeth 4 1/2 air is good for most situations.

R.Y
Well Them BTU Numbers Will depend on what the coal is Putting out per lb Not all coal Put out the same amount of BTU's
Per lb That will be more important then anything . And as you should already Know That them efm Number are way on the Conservative Side These units will put out way more BTU's then they Advertise . Down here in this area coal will range
from 13.100 BTU's Per lb uP to 13.800 Per lb Now Take any of them and X that by the feed rate per lb going in to the
Furnace Your Gross output then subtract your heat loss thew the boiler /water and chimney Your net output So lets say we take off 2k per lb of coal for heat loss. At 4 teeth feed rate 10lbs Per Hr. say the coal is 13.500 BTU per lb x 10lbs that is 135.000 BTU going in Gross output. Now take off say 2K per lb 11.500 per lb x 10lbs per hr. coming out Net output will

be 115.000 BTU's Per hr.What efm Advertise is at 4 teeth feed rate 10 lbs per hr . is 85.870 btuh Gross output & Net output is 74.670 btuh So that means the coal that they tested was 8.587 BTU Per Lb Gross output going in and the Net output coming out was 7.467 BTU Per Lb. Now Anyone That knows Anthracite coal knows that them Numbers are not
even in a Anthracite BTU's Scale or for that matter even Bituminous coal BTU scale Them numbers are Sub Anthracite & Sub Bituminous BTU scale and even Anthracite waste Products btuh scale .

I have asked EFM many times where them numbers or how they come up with them from and Never got a real Answer.
Now if you know first hand where & How they come up with them number Please let us know .
Not trying To be a Jackass but I would like to know . And I am sure many other's would want to know aswell .
Last edited by coal berner on Sun. Jan. 11, 2009 9:33 pm, edited 1 time in total.
J.C.

Heating house & water with a 1986 electric furnace man DF520 using buckwheat Anthracite coal

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coal berner
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Posts: 3591
Joined: Tue. Jan. 09, 2007 12:44 am
Stoker Coal Boiler: 1986 Electric Furnace Man 520 DF
Stove/Furnace Make: Electric Furnace Man
Stove/Furnace Model: DF520
Location: Pottsville PA. Schuylkill County PA. The Hart Of Anthracite Coal Country.

Post Sun. Jan. 11, 2009 7:49 pm

cArNaGe wrote:I'm at 6 teeth/ 5.5 air.
My Air Handler is 135,000 btu.
I ran it at 4 teeth but it would drop the boiler temp.
My boiler only runs when my air handler runs.
And if you go by efm numbers 6 teeth feed rate is 15 lbs per hr. with a Gross output of 128.810 BTUH & Net output BTUH 112.010 with 747 FT. Water Net . So what does that tell you about there Gross output BTUH & Net output BTUH Numbers
What is your low & High setpoint at
Last edited by coal berner on Sun. Jan. 11, 2009 9:46 pm, edited 2 times in total.
J.C.

Heating house & water with a 1986 electric furnace man DF520 using buckwheat Anthracite coal

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e.alleg
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Stove/Furnace Make: EFM
Stove/Furnace Model: 520
Location: western ny

Post Sun. Jan. 11, 2009 8:42 pm

I would keep it at 4 teeth and see how it goes. I had to bump mine up a notch because during sub zero temps the boiler water would get down to 130 or so and when taking a shower while the house is calling for heat made for a not so hot shower.
Burning coal is definitely worth the extra work involved.
"Good enough" is not good enough.

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Pa Dealer
Member
Posts: 244
Joined: Fri. Aug. 15, 2008 10:12 am
Stoker Coal Boiler: EFM 520 DF
Coal Size/Type: Rice
Other Heating: Keystoker
Stove/Furnace Make: EFM DF 520
Stove/Furnace Model: Keystoker
Location: NEPA

Post Sun. Jan. 11, 2009 9:20 pm

coal berner wrote:
Pa Dealer wrote:At four teeth your net BTU's are 74670, at five teeth net BTU's are 93340 not knowing the square feet of what you are trying to heat, and domestic coil demands five teeth 4 1/2 air is good for most situations.

R.Y
Well Them BTU Numbers Will depend on what the coal is Putting out per lb Not all coal Put out the same amount of BTU's
Per lb That will be more important then anything . And as you should already Know That them efm Number are way on the Conservative Side These units will put out way more BTU's then they Advertise . Down here in this area coal will range
from 13.100 BTU's Per lb uP to 13.800 Per lb Now Take any of them and X that by the feed rate per lb going in to the
Furnace Your Gross output then subtract your heat loss thew the boiler /water and chimney Your net output So lets say we take off 2k per lb of coal for heat loss. At 4 teeth feed rate 10lbs Per Hr. say the coal is 13.500 BTU per lb x 10lbs that is 135.000 BTU going in Gross output. Now take off say 2K per lb 11.500 per lb x 10lbs per hr. coming out Net output will

be 115.000 BTU's Per hr.What efm Advertise is at 4 teeth feed rate 10 lbs per hr . is 85.870 btuh Gross output & Net output is 74.670 btuh So that means the coal that they tested was 8.587 BTU Per Lb Gross output going in and the Net output coming out was 7.467 BTU Per Lb. Now Anyone That knows Anthracite coal knows that them Numbers are not
even in a Anthracite BTU's Scale or for that matter even Bituminous coal BTU scale Them numbers are Sub Anthracite & Sub Bituminous BTU scale and even Anthracite waste Products btuh scale .

I have asked EFM many times where them numbers or how they come up with them from and Never got a real Answer.
Now if you know first hand where & How they come up with them number Please let us know . Not trying To be a Jackass
but I would like to know . And I am sure many other's would want to know aswell .
Hey J.C. I don't know where they got those BTU ratings, but I always thought they seemed on the low side. It does matter on the type of coal and its btu, by the way nice explanation.I kinda figured the J in J.C. didnt stand for jack ass! :D Have a good night.

R.Y

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coal berner
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Stoker Coal Boiler: 1986 Electric Furnace Man 520 DF
Stove/Furnace Make: Electric Furnace Man
Stove/Furnace Model: DF520
Location: Pottsville PA. Schuylkill County PA. The Hart Of Anthracite Coal Country.

Post Sun. Jan. 11, 2009 9:44 pm

e.alleg wrote:I would keep it at 4 teeth and see how it goes. I had to bump mine up a notch because during sub zero temps the boiler water would get down to 130 or so and when taking a shower while the house is calling for heat made for a not so hot shower.
Ed Did you ever Just bump up you high & low set point or Just your Feed rate keeping the water at a higher temp will help
you when the water wants to drop say you have yours at 140 low 180 high with a 10 diff when when calling for heat & a
shower the water will drop to 130 then start to go back up if you set it at 150 L or 160 L then you high at 190 or 200 then
when it drops it will be at 140 or 150 instead of 130 try 160 low and 200 high with a 10 diff you will have lots of hot water for a shower Plus with the high Numbers The stoker does not work as much it will keep the boiler more satisfied
J.C.

Heating house & water with a 1986 electric furnace man DF520 using buckwheat Anthracite coal

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billw
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Location: Dallas, PA

Post Mon. Jan. 12, 2009 7:55 pm

I think I'll let it go as is. Worst case is I have to turn it up once I get home. I love playing with the settings, I probably should keep track of what I'm doing on paper instead of just in my head.

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coal berner
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Posts: 3591
Joined: Tue. Jan. 09, 2007 12:44 am
Stoker Coal Boiler: 1986 Electric Furnace Man 520 DF
Stove/Furnace Make: Electric Furnace Man
Stove/Furnace Model: DF520
Location: Pottsville PA. Schuylkill County PA. The Hart Of Anthracite Coal Country.

Post Mon. Jan. 12, 2009 8:15 pm

billw wrote:I think I'll let it go as is. Worst case is I have to turn it up once I get home. I love playing with the settings, I probably should keep track of what I'm doing on paper instead of just in my head.
What is your Low & High set pionts you bump the high up a bit to with this cold spell I went from 140 low 180 High
10 Diff. to 160 low 200 High 10 Diff. The unit works less with the higher set points the boiler stays hotter longer and when the house calls for heat the water temp does not drop as far so the cycle time is even shorter 15 to 20 minutes untill the t stat upstairs is satisfied 2 to 3 times in 24 hrs. Before with the other setting it was 25 to 35 minutes 3 to 4 cycle times in 24 hrs. Try it and see how it works for you .
J.C.

Heating house & water with a 1986 electric furnace man DF520 using buckwheat Anthracite coal

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billw
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Post Mon. Jan. 12, 2009 10:19 pm

2 to 3 heat calls in 24 hrs? Holy *censored*, what do you have as insulation? cast iron radiators? I noticed the cast iron radiators I have in the basement stay warm for hours. I'm working on my wife so I can change out the radiators in the first and second floors. They're pretty cheap in the Paper shop.

I moved my aquastat up to 160 low, 200 high in December. That does make a big difference. Most times my boiler is sitting at 180, until I get a call for heat.

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e.alleg
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Post Mon. Jan. 12, 2009 10:45 pm

JC the problem I had was the wind was sucking the heat out of the house so the stoker kept stoking to keep up and after a while the boiler temp went down below where I wanted it, simply a case of not enough fire to replenish the heat being stripped out of the water.
Burning coal is definitely worth the extra work involved.
"Good enough" is not good enough.

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coal berner
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Posts: 3591
Joined: Tue. Jan. 09, 2007 12:44 am
Stoker Coal Boiler: 1986 Electric Furnace Man 520 DF
Stove/Furnace Make: Electric Furnace Man
Stove/Furnace Model: DF520
Location: Pottsville PA. Schuylkill County PA. The Hart Of Anthracite Coal Country.

Post Mon. Jan. 12, 2009 10:55 pm

billw wrote:2 to 3 heat calls in 24 hrs? Holy *censored*, what do you have as insulation? cast iron radiators? I noticed the cast iron radiators I have in the basement stay warm for hours. I'm working on my wife so I can change out the radiators in the first and second floors. They're pretty cheap in the Paper shop.

I moved my aquastat up to 160 low, 200 high in December. That does make a big difference. Most times my boiler is sitting at 180, until I get a call for heat.
10 cast iron radiators upstairs and one downstairs with 90 feet of baseboard downstairs 275 ft of 3/4" copper pipe 275 ft of 1 " copper pipe 55ft of 1 1/4" copper pipe 295 ft of 1/2 copper pipe 41gals in the boiler I put the Jackets on the boiler that help alot keeping the boiler hot temps went up 40 to 50 degress. as for Insulation None in the walls it is a 1948 ranch coal ash cinder block house. The attic has the old paper blown in Insulation . Upstairs is 1640 sqft basement is
1500 sqft. When I had it at 140 Low 180 High with a 10 Diff My temp in the boiler would be 160 to 170 sometimes hitting 180 with out the jackets on . Now with it set at 160 low 200 high 10 diff with the Jackets on the temps are now staying
190 200 some times 210. So the Jackets do help Oh That is without the Insulation on the boiler. Plus the boiler room went from 80f to 70f much nicer to work down there .
J.C.

Heating house & water with a 1986 electric furnace man DF520 using buckwheat Anthracite coal

lincolnmania
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Hot Air Coal Stoker Furnace: efm af-150 1982
Hot Air Coal Stoker Stove: alaska kodiak stoker 1986
Hand Fed Coal Stove: warm morning 1980 kenmore
Location: newtown/zerbe pa
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Post Tue. Jan. 13, 2009 1:14 am

when it gets really bitter cold outside, I have to increase the feed to 6 teeth (iirc the max on my stoker) to get the shop above 60 degrees.......but i'm running a hot air furnace in a large shop....i know the af150 is grosly undersized, but it was free lol......i can only dream of someday ripping out the floors and putting in floor heat and some overhead heat exchangers and a efm boiler......gotta keep the building from falling in first.

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