Can't get good burn time with sub-bit coal

Re: Can't get good burn time with sub-bit coal

PostBy: dmay On: Wed Jan 11, 2012 6:08 pm

Well I'm getting the times but the temp on the furnace is still dropping. No matter if the span draft is at 1/2 or 4 temp on furnace don't go up please help or am I worrying about nothing
dmay
 
Stove/Furnace Make: us stove
Stove/Furnace Model: hot blast 1500

Re: Can't get good burn time with sub-bit coal

PostBy: LsFarm On: Wed Jan 11, 2012 10:11 pm

Each type of coal has different burning characteristics. All coal seems to have more heat energy in the first 30% of it's burn cycle, that 's from catching fire till it is burnt out to ash.

IWhen I was hand stoking my self designed and home [shop] fabricated 'big Bertha' boiler, I noticed that the fresh loads of coal produced the most heat, and a few hours later the coal was all red, making heat but at a much lower level than when first added to the fire.

I think this is why stokers appeal to me, whenever the water temp drops, the stoker fires up to reheat the water, and fresh coal is added, and this fresh coal burns much hotter than coal that is at it's 'half life'..

Since your coal has much lower BTU content than either Bit or Anthracite, I think you are doing as good as you can.

Can you get a ton or so of high quality Bit coal, and give it a try for a comparrison? maybe you could mix your free sub-bit with good bit and still
be on the 'less expensive' side compared to everyone else here on the forum.

Greg L
LsFarm
 
Stoker Coal Boiler: Axeman Anderson 260
Hand Fed Coal Boiler: Self-built 'Big Bertha' SS Boiler
Baseburners & Antiques: Keystone 11, Art Garland

Re: Can't get good burn time with sub-bit coal

PostBy: dmay On: Thu Jan 12, 2012 5:07 pm

Well Greg this is the 2nd type coal in eastern KY I have gotten. Popular wood does better then the coal that just don't seam right. I'm not sure the type if it is sub or bit. Thanks for the help I just don't understand why I can't get coal to burn any better but the wood does samething
dmay
 
Stove/Furnace Make: us stove
Stove/Furnace Model: hot blast 1500


Re: Can't get good burn time with sub-bit coal

PostBy: Willis On: Thu Jan 12, 2012 6:01 pm

If it is Ky mined coal it is definitely bituminous coal. Sub bit coal is more common out west in states such as Wyoming and Montana
Willis
 
Hot Air Coal Stoker Furnace: Combustioneer 24 FA w/ Will-Burt s-30
Hot Air Coal Stoker Stove: Combustioneer 77, Stokermatic
Hand Fed Coal Stove: Warm Morning 520,521
Coal Size/Type: Washed stoker- Bituminous

Re: Can't get good burn time with sub-bit coal

PostBy: dmay On: Thu Jan 12, 2012 7:57 pm

I know that we are supposed to have good coal in eastern. Ky so I wish I could get this 1500 hot blast to working right. I think it should. Hold the temp in furnace for longer time then 3 or 4 hrs. If I'm. Wrong please tell me then I guess I'll leave you'll alone and quit bothering you'll
dmay
 
Stove/Furnace Make: us stove
Stove/Furnace Model: hot blast 1500

Re: Can't get good burn time with sub-bit coal

PostBy: LsFarm On: Fri Jan 13, 2012 12:53 am

It sounds like you need to run the 'hot blast' at maximum to stay at your desired heat level/output.. To me, it sounds like it's too small a unit for your
heating needs.

Greg L
LsFarm
 
Stoker Coal Boiler: Axeman Anderson 260
Hand Fed Coal Boiler: Self-built 'Big Bertha' SS Boiler
Baseburners & Antiques: Keystone 11, Art Garland

Re: Can't get good burn time with sub-bit coal

PostBy: dmay On: Fri Jan 13, 2012 8:46 am

So around 300 is where the hot blast should hold at after the first stage of burn. Greg thanks for the help
dmay
 
Stove/Furnace Make: us stove
Stove/Furnace Model: hot blast 1500

Re: Can't get good burn time with sub-bit coal

PostBy: Dennis On: Fri Jan 13, 2012 9:21 am

Dmay,
are you sifting or screening your sub-bit, not sure if you need to or not. Maybe your getting too much dirt and fines mixed in and smothering the fire.I saw stephen in soky thread on "run of the mine" and he was screening his lump coal. Maybe Berlin or someone with more experence with bit. coal can chime in and see if you need to screen your coal if your not already doing that. Dennis
Dennis
 
Hand Fed Coal Boiler: AHS/WOC55-multi-fuel/wood,oil,coal
Coal Size/Type: Anthracite/stove size

Re: Can't get good burn time with sub-bit coal

PostBy: dmay On: Fri Jan 13, 2012 9:41 am

The coal is dirty but I'm using big lump size from football to volleyball not smaller than baseball
dmay
 
Stove/Furnace Make: us stove
Stove/Furnace Model: hot blast 1500

Re: Can't get good burn time with sub-bit coal

PostBy: dmay On: Fri Jan 13, 2012 10:12 am

I sure hope somebody can help me get it working right got fire going again at 7:00 and the furnace is still running at 500 at 9:00 at 1 and 1/2
dmay
 
Stove/Furnace Make: us stove
Stove/Furnace Model: hot blast 1500

Re: Can't get good burn time with sub-bit coal

PostBy: Dennis On: Fri Jan 13, 2012 10:26 am

Dmay,
does the house and DHW keep temps. that you need?
Dennis
 
Hand Fed Coal Boiler: AHS/WOC55-multi-fuel/wood,oil,coal
Coal Size/Type: Anthracite/stove size

Re: Can't get good burn time with sub-bit coal

PostBy: dmay On: Fri Jan 13, 2012 10:34 am

Yell the temp in the house well hold if temp don't drop in the 20s or lower
dmay
 
Stove/Furnace Make: us stove
Stove/Furnace Model: hot blast 1500

Re: Can't get good burn time with sub-bit coal

PostBy: Dennis On: Fri Jan 13, 2012 10:52 am

well,maybe with your coal and your furnace that may be all you will get out of the situation. Keep reading and tweeking you might stumble onto something that works. Are your heat ducts insulated going from the out building to the house. How cold does it get down there.
Dennis
 
Hand Fed Coal Boiler: AHS/WOC55-multi-fuel/wood,oil,coal
Coal Size/Type: Anthracite/stove size

Re: Can't get good burn time with sub-bit coal

PostBy: dmay On: Fri Jan 13, 2012 11:33 am

The duct work from furnace to the underground duct work is not.then it come out from under ground under the floor of house into flex duct in to the house the flex duct is insulated.it is 25 outside now at 10:30 .maybe I need to insulate ductwork in building .I'm getting the blue flame after about 3 hrs they are about 6" high in the furnace is that good
dmay
 
Stove/Furnace Make: us stove
Stove/Furnace Model: hot blast 1500

Re: Can't get good burn time with sub-bit coal

PostBy: Dennis On: Fri Jan 13, 2012 11:45 am

Defenitly would help to insulate, but at 25* that's a summer project.When temps. get that low many others have problems keeping up with heat also.As long as you can keep the house warm, that's the most important thing. Sounds like your getting good burn times now.
Dennis
 
Hand Fed Coal Boiler: AHS/WOC55-multi-fuel/wood,oil,coal
Coal Size/Type: Anthracite/stove size