normal coal consumption?

normal coal consumption?

PostBy: snopro700 On: Sun Feb 09, 2014 12:10 pm

Hey guys, newb here from New Haven, CT. Just wondering what amount of nut coal is normal to burn per day? Its been about 20-30 degrees out, 1200 sq ft house and we have a good size Jensen wood/coal forced air furnace.

We recently picked up a full skid (1.2 ton) of coal, since our wood supply is running low this year. Started burning yesterday around 1pm, now at 11am the next day ive shoveled about 90lbs of coal into it, just keeping the house around 70*. at this rate it doesnt seem like a full skid will go as far as we hoped. Or, is it just normal to use alot of coal getting a good bed going and then using less once its nice and deep?

As for my setup, it as a variable speed combustion blower 75cfm i believe, 8" flue with manual damper. Looking for any tips on the best way to set up the blower/damper, as coal seems to respond much differently than wood to adjustments.

should i use more air? less? keep the flue more open or closed?

Thanks!
-Kurt.
snopro700
 
Hand Fed Coal Furnace: Jensen wood/coal forced air furnace
Coal Size/Type: Nut/Anthricite
Other Heating: Oil-fired boiler- hot water Baseboard/radiator

Re: normal coal consumption?

PostBy: SMITTY On: Sun Feb 09, 2014 12:15 pm

Yeah if you calculate off the first loading, it's going to be way high. Gotta figure, your loading the ENTIRE firebox up. When you refresh the fire in the coming days, your only loading about 2/3 at the most.

I used to burn about 70 lbs. every 24 hours with my Mark III - that figure would drop to every 16-18 hours on a below-zero morning in January.
SMITTY
 
Stoker Coal Boiler: Patriot Coal - custom built by Jim Dorsey
Hand Fed Coal Stove: Harman Mark III (not currently in use)
Coal Size/Type: Rice / Blaschak anthracite
Other Heating: Oil fired Burnham boiler

Re: normal coal consumption?

PostBy: snopro700 On: Sun Feb 09, 2014 12:27 pm

SMITTY wrote:Yeah if you calculate off the first loading, it's going to be way high. Gotta figure, your loading the ENTIRE firebox up. When you refresh the fire in the coming days, your only loading about 2/3 at the most.

I used to burn about 70 lbs. every 24 hours with my Mark III - that figure would drop to every 16-18 hours on a below-zero morning in January.



ok thats kinda what i figured, hoping to get her down to about a bag a day, that would get us about 2 months out of a skid.

now as far as actually burning it, compared to wood, do you recommend more or less combustion air?
snopro700
 
Hand Fed Coal Furnace: Jensen wood/coal forced air furnace
Coal Size/Type: Nut/Anthricite
Other Heating: Oil-fired boiler- hot water Baseboard/radiator

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Re: normal coal consumption?

PostBy: Rob R. On: Sun Feb 09, 2014 12:30 pm

Less air, and it must come up through the coal.
Rob R.
 
Stoker Coal Boiler: EFM DF520
Hand Fed Coal Stove: Hitzer 50-93
Coal Size/Type: Lehigh Rice
Other Heating: Dad's 1953 EFM Highboy

Re: normal coal consumption?

PostBy: Carbon12 On: Sun Feb 09, 2014 12:49 pm

You're probably going to use a lot more coal starting up AND learning the nature of the beast. Once the learning curve becomes less steep, you should burn less. I'm guessing, of course, but you will probably burn more than a ton between now and the end of the season.
Carbon12
 
Stoker Coal Boiler: Keystoker KA-6
Coal Size/Type: Rice/Anthracite
Other Heating: Heat Pump/Forced Hot Air Oil Furnace

Re: normal coal consumption?

PostBy: Carbon12 On: Sun Feb 09, 2014 12:50 pm

How much wood have you burned so far this year? How much do you burn in a "normal" year?
Carbon12
 
Stoker Coal Boiler: Keystoker KA-6
Coal Size/Type: Rice/Anthracite
Other Heating: Heat Pump/Forced Hot Air Oil Furnace

Re: normal coal consumption?

PostBy: snopro700 On: Sun Feb 09, 2014 12:57 pm

Rob R. wrote:Less air, and it must come up through the coal.


The combustion blower pushes air directly into the bottom of the coal bed so i got that covered. :D
I will try turning down the air a bit more then, just trying to have a good steady fire going without burning through way more fuel than i need to.

heres a couple pics of my setup, and the fire i have going now.
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snopro700
 
Hand Fed Coal Furnace: Jensen wood/coal forced air furnace
Coal Size/Type: Nut/Anthricite
Other Heating: Oil-fired boiler- hot water Baseboard/radiator

Re: normal coal consumption?

PostBy: snopro700 On: Sun Feb 09, 2014 1:02 pm

Carbon12 wrote:How much wood have you burned so far this year? How much do you burn in a "normal" year?


usually we burn probably burn 5 cord of wood, but we had only split about 3-4 cord this year, and been through at least 2-1/2 cord so far.
snopro700
 
Hand Fed Coal Furnace: Jensen wood/coal forced air furnace
Coal Size/Type: Nut/Anthricite
Other Heating: Oil-fired boiler- hot water Baseboard/radiator

Re: normal coal consumption?

PostBy: titleist1 On: Sun Feb 09, 2014 1:11 pm

welcome to the forum!!!

it is very useful when trying to maximize efficiency to have a couple temp gauges, one for the fire box and one for the flue pipe and to have a manometer to measure the draft in the flue vs fire box, especially since you have a combustion fan you will vary.

Only change one setting at a time and give it an hour or two to become stable after the change.
titleist1
 
Hot Air Coal Stoker Stove: Harman Mag Stoker (old style) one in basement, one in workshop
Hand Fed Coal Stove: Harman Mark III on standby for long power outages
Coal Size/Type: Rice/Anthracite; Nut/Anthracite

Re: normal coal consumption?

PostBy: snopro700 On: Sun Feb 09, 2014 1:23 pm

titleist1 wrote:welcome to the forum!!!

it is very useful when trying to maximize efficiency to have a couple temp gauges, one for the fire box and one for the flue pipe and to have a manometer to measure the draft in the flue vs fire box, especially since you have a combustion fan you will vary.

Only change one setting at a time and give it an hour or two to become stable after the change.


yes I noticed that coal isn't as quick to respond to changes.

However, I do hvac for work, so I can measure draft and temps, need to grab a couple good thermometers for it. Ideally though, what should I be looking to get for draft and firebox/flue temp?
snopro700
 
Hand Fed Coal Furnace: Jensen wood/coal forced air furnace
Coal Size/Type: Nut/Anthricite
Other Heating: Oil-fired boiler- hot water Baseboard/radiator

Re: normal coal consumption?

PostBy: Carbon12 On: Sun Feb 09, 2014 1:49 pm

The draft and temperature setting should be in the owners manual. If you don't have one, do a search on the forum and the web. Just be careful not to over fire, especially with a combustion blower. If anything starts glowing, you're over firing. Make sure you have a bunch of carbon monoxide detectors as well. They are not optional. :)
Carbon12
 
Stoker Coal Boiler: Keystoker KA-6
Coal Size/Type: Rice/Anthracite
Other Heating: Heat Pump/Forced Hot Air Oil Furnace

Re: normal coal consumption?

PostBy: Freddy On: Sun Feb 09, 2014 2:11 pm

Welcome to the forum!

Do you have CO detectors? If not, shut down now & get one or more. Do not sleep without CO detectors!

Do you have a barometric damper and manometer? If you don't know your draft you could be losing a lot of heat up the chimney.
Freddy
 
Stoker Coal Boiler: Axeman Anderson 130 (pea)
Hot Air Coal Stoker Stove: Reading piece o' junk in the barn (rice)
Coal Size/Type: Pea size, Superior, deep mined

Re: normal coal consumption?

PostBy: titleist1 On: Sun Feb 09, 2014 2:12 pm

if you don't have an owners manual, i'd shoot for .04 on the draft in the flue pipe to start, make sure you are not pressurizing the firebox with the combustion fan blowing too much air in there.

Temps are going to be really different depending on stove / weather / house / etc. The stove temp will tell you how intensely to fire the stove to get the house comfortable in different weather, you should have an idea from burning wood what a good target temp is to start with. The flue / stove temp differential will tell you how efficient you are with your burn. flue temp should be less than half the stove body temp, for example, this morning my stoker was at 680* above the door and 230* on the stack measured with an ir temp gauge before the baro. after the baro it was 155*.
Last edited by titleist1 on Sun Feb 09, 2014 2:46 pm, edited 1 time in total.
titleist1
 
Hot Air Coal Stoker Stove: Harman Mag Stoker (old style) one in basement, one in workshop
Hand Fed Coal Stove: Harman Mark III on standby for long power outages
Coal Size/Type: Rice/Anthracite; Nut/Anthracite

Re: normal coal consumption?

PostBy: snopro700 On: Sun Feb 09, 2014 2:42 pm

Yes we have CO monitors.

As for draft, our furnace is only equipped with manual damper, so I can set it that way.
I do have a manometer I can shoot for .4" WC and go from there. Right now she's burning hot enough the forced air blower kicks on and off every 5-10 minutes and stack temp is just hot enough I can't place my hand on it for more than a few seconds....I will have to dig out my presion digital thermometer from work and get some temp readings.

I do have some of the owners manual for the furnace, but only what the previous owner gave me. Will have to flip though what I have but I don't remember it going any further than starting a coal fire and shaking it down.
snopro700
 
Hand Fed Coal Furnace: Jensen wood/coal forced air furnace
Coal Size/Type: Nut/Anthricite
Other Heating: Oil-fired boiler- hot water Baseboard/radiator

Re: normal coal consumption?

PostBy: lsayre On: Sun Feb 09, 2014 2:43 pm

When everything is dialed out for wood and dialed in for coal you should burn about one ton of coal for every 1.5 cords of wood.
lsayre
 
Stoker Coal Boiler: AHS S130 Coal Gun
Coal Size/Type: Stockton Anthracite Pea
Other Heating: Resistance Boiler (13.5 KW)

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