Unburnt coal - Quality problem?

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Unburnt coal - Quality problem?

PostBy: tcalo On: Sat Jan 21, 2012 10:31 pm

I've been having issues with unburnt coal. Should the coal burn completely to ash? If left unattended I'm always left with a small layer of unburnt coal. I'm burning Blaschak...clean with very little fines. Ash seems chunky, not chalky! Does brand affect quality? Any advice would be greatly appreciated!
tcalo
 
Hand Fed Coal Stove: Chubby Coal Stove
Coal Size/Type: Nut Anthracite

Re: Unburnt coal - Quality problem?

PostBy: Coalfire On: Sat Jan 21, 2012 10:46 pm

where is this small layer located?



Eric
Coalfire
 
Hand Fed Coal Stove: DS Machine 96K btu Circulator
Coal Size/Type: Nut

Re: Unburnt coal - Quality problem?

PostBy: tcalo On: Sat Jan 21, 2012 10:50 pm

Sorry, I should've been more specific :hammer: . I have a coal chubby with a suspended fire pot. The unburnt layer of coal is left on the grate.
tcalo
 
Hand Fed Coal Stove: Chubby Coal Stove
Coal Size/Type: Nut Anthracite

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Re: Unburnt coal - Quality problem?

PostBy: Coalfire On: Sat Jan 21, 2012 10:52 pm

tcalo wrote:
Coalfire wrote:where is this small layer located?

Sorry, I should've been more specific :hammer: . I have a coal chubby with a suspended fire pot. The unburnt layer of coal is left on the grate.



What do you mean left on the grate.


Left on as chokes the air flow? or when you leave the stove burn out?


Eric
Coalfire
 
Hand Fed Coal Stove: DS Machine 96K btu Circulator
Coal Size/Type: Nut

Re: Unburnt coal - Quality problem?

PostBy: tcalo On: Sat Jan 21, 2012 11:01 pm

I let the stove burn out and there is unburnt coal left on the grate. I assumed the coal would completely burn to ash.
tcalo
 
Hand Fed Coal Stove: Chubby Coal Stove
Coal Size/Type: Nut Anthracite

Re: Unburnt coal - Quality problem?

PostBy: 2001Sierra On: Sat Jan 21, 2012 11:19 pm

Coal will not burn to ash when allowed to burn out. Coal always needs new coal to complete the burn of previous coal as is goes through its burn cycle. We are burning stone not trees.
2001Sierra
 
Hot Air Coal Stoker Stove: Keystoker 90 Chimney vent
Coal Size/Type: Rice
Other Heating: Buderus Oil Boiler 3115-34
Stove/Furnace Model: Keystoker 90 Chimney Vent

Re: Unburnt coal - Quality problem?

PostBy: tcalo On: Sat Jan 21, 2012 11:38 pm

2001Sierra wrote:Coal will not burn to ash when allowed to burn out. Coal always needs new coal to complete the burn of previous coal as is goes through its burn cycle. We are burning stone not trees.



Good to know. New to coal so I'm still learning. I was loosing my marbles trying to figure this out. I burn both wood and coal and thought maybe the wood ash was choking the fire so I switched to strictly coal for the past few days. I haven't had a problem when I have a continuous fire burning, but once the fire gets too low it seems to peter out leaving an unburnt layer behind. I've been experimenting with the MPD to see if it helps.
tcalo
 
Hand Fed Coal Stove: Chubby Coal Stove
Coal Size/Type: Nut Anthracite

Re: Unburnt coal - Quality problem?

PostBy: 2001Sierra On: Sat Jan 21, 2012 11:40 pm

Keep the faith, you will do well :P
2001Sierra
 
Hot Air Coal Stoker Stove: Keystoker 90 Chimney vent
Coal Size/Type: Rice
Other Heating: Buderus Oil Boiler 3115-34
Stove/Furnace Model: Keystoker 90 Chimney Vent

Re: Unburnt coal - Quality problem?

PostBy: Coalfire On: Sun Jan 22, 2012 8:45 am

tcalo wrote:
2001Sierra wrote:Coal will not burn to ash when allowed to burn out. Coal always needs new coal to complete the burn of previous coal as is goes through its burn cycle. We are burning stone not trees.



Good to know. New to coal so I'm still learning. I was loosing my marbles trying to figure this out. I burn both wood and coal and thought maybe the wood ash was choking the fire so I switched to strictly coal for the past few days. I haven't had a problem when I have a continuous fire burning, but once the fire gets too low it seems to peter out leaving an unburnt layer behind. I've been experimenting with the MPD to see if it helps.



Fire should not get to low, if you are on a regular shake and refill schedule. Yes the MPD will keep more heat in the stove so you can use less coal. Do you fill the stove all the way? what are your shake and reload schedules?, Hows hot do you run the stove?

You will get the knack of it


Eric
Coalfire
 
Hand Fed Coal Stove: DS Machine 96K btu Circulator
Coal Size/Type: Nut

Re: Unburnt coal - Quality problem?

PostBy: cokehead On: Sun Jan 22, 2012 11:51 am

I do a lot of burn out/restart cycles with a little hot water boiler. I always have a layer of partially burned coal on the top of the ash after the burn out. When I do my shake downs I decided to get out the ash but leave as much of the partially burned coal on the grates before I do my restart because I hate waste. I build my new fire on top of that residue. I don't get crazy about picking out the partially burned stuff out of the ash, just what is obvious. Once the fire is re-established that partially burned stuff gets burned and passes through the grate during routine shake downs, minimal waste. Unburned residue on burnout is just the nature of the beast.

I get some chunky ash as well.
cokehead
 
Stove/Furnace Make: Locke, Godin, Tarm in da works
Stove/Furnace Model: Warm Morning 617-A, 3721, 502

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