Slag in my Defiant Coal Stove

Slag in my Defiant Coal Stove

PostBy: mrpete64 On: Sun Oct 26, 2008 4:50 pm

I must not be cleaning the grates correctly on my Defiant because I let it burn out to clean it and found large chunks of slag. Those of you that have the newer Defiant I would appreciate a "tutorial" on how to avoid this and how to keep the grates open to let the dust go into the ash pan.
Thanks for you insight(s).
Mr. Pete--->
mrpete64
 
Stove/Furnace Make: vermont casting coal stove

Re: Slag in my Defiant Coal Stove

PostBy: LsFarm On: Sun Oct 26, 2008 5:36 pm

Do you have a photo of these pieces of 'slag' ?? These may be clinkers which is melted-together ash from a hot fire...

Greg L

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

Re: Slag in my Defiant Coal Stove

PostBy: mrpete64 On: Mon Oct 27, 2008 8:32 am

This is the "stuff" I took out of my stove. I assume that it is from burning the stove to hot. It is taking me a while to "catch on" to burning coal after burning wood for 35 years. Coal is much less forgiving!!
Mr.Pete--->
mrpete64
 
Stove/Furnace Make: vermont casting coal stove

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Re: Slag in my Defiant Coal Stove

PostBy: tsb On: Mon Oct 27, 2008 8:19 pm

Coal is not at all like wood. A wood stove will burn with a surface temperature up to 700 degrees. The coal stove will be about 350-450 at most.
Coal likes to burn slow and steady. The fire should glow, not blaze. Your getting clinkers from over firing the stove. Some coal is better then others, but if you do have clinker problems, try slowing down the burn. It may seem like your not getting anything out of the stove, but coal gives you a nice even heat 24 / 7.
Good luck

TSB
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Stoker Coal Boiler: Binford 2000
Hot Air Coal Stoker Stove: LL Pioneer top vent
Hand Fed Coal Stove: Saey Hanover II

Re: Slag in my Defiant Coal Stove

PostBy: VigIIPeaBurner On: Tue Oct 28, 2008 11:36 am

tsb wrote:Coal is not at all like wood. A wood stove will burn with a surface temperature up to 700 degrees. The coal stove will be about 350-450 at most.TSB


TSB, is 350 - 450 for a forced air stove? He's burning in a Vigilant II that's totally radiant. Paraphrasing from what I recall from the manual, the Vigilant should operate 400 -700. That's taking a measurement right from the top of the cast top loading door that sits directly above the fire.

Be careful of what tools you use to measure with. I've had three different magnetic stove top thermometers that calibrated ok when suspended in boiling water. They all read differently when on the stove top. Trying to be more accurate, I bought an IR thermometer. It agrees with other calibrated thermometers I've checked it against. When my stove is burning at 700, the max recommended, I'm putting 85-90 Lbs of pea thru it a day. According to other calculations I've gleaned from this forum, that works out to close to 50,000 btu/hr - max output for the Vigilant.
VigIIPeaBurner
 
Hot Air Coal Stoker Furnace: Keystoker Koker
Hand Fed Coal Stove: Vermont Casting Vigilant II 2310
Other Heating: #2 Oil Furnace

Re: Slag in my Defiant Coal Stove

PostBy: tsb On: Tue Oct 28, 2008 8:28 pm

700 seems a little hot for a coal stove. I would be afraid of clinkers and some casting damage.

TSB
tsb
 
Stoker Coal Boiler: Binford 2000
Hot Air Coal Stoker Stove: LL Pioneer top vent
Hand Fed Coal Stove: Saey Hanover II

Re: Slag in my Defiant Coal Stove

PostBy: VigIIPeaBurner On: Tue Oct 28, 2008 10:53 pm

Yes it does seem hot and it does throw some heat! 700 might be for steel but the stove is cast iron. I've been playing it by the rules for seven seasons and no major wear. Replaced the fire brick once and am on the third season on the replacements. I do have a front grill on order, the original on has sagged a bit from seven years of burning but is still functional. I'd recommend an IR thermometer as the three stove top units I had were off as much as 25%. Going by something that far off could really get into over fire conditions unless your gut told you better :!:

Range of 400-700 is on page 17 of the manual. http://www.vermontcastings.com/catalog/ ... gilant.pdf
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VigIIPeaBurner
 
Hot Air Coal Stoker Furnace: Keystoker Koker
Hand Fed Coal Stove: Vermont Casting Vigilant II 2310
Other Heating: #2 Oil Furnace

Re: Slag in my Defiant Coal Stove

PostBy: tsb On: Wed Oct 29, 2008 5:45 pm

If that what the man say, then let it rip. Keep the grand kids and the dog clear.

TSB
tsb
 
Stoker Coal Boiler: Binford 2000
Hot Air Coal Stoker Stove: LL Pioneer top vent
Hand Fed Coal Stove: Saey Hanover II

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