puff back with wood stove?

puff back with wood stove?

PostBy: soultinter On: Mon Feb 03, 2014 1:10 pm

Has anyone ever had a puff back or violent explosion while burning wood? I have a hitzer 983 freestanding with double doors and spinner knobs, in addition to top sliders and the bottom ash pan slider that i dont use at all b cus i only burn wood not coal. But I have been experiencing some serious small explosions that scare the hell out of me and im worried the stove pipe is gonna blow off ! I know people get these with coal due to volatiles from the coal, but wood? and its not even after i stoke it, it seems slightly random. HELP!!!
soultinter
 
Stove/Furnace Make: hitzer
Stove/Furnace Model: 983 freestanding

Re: puff back with wood stove?

PostBy: Carbon12 On: Mon Feb 03, 2014 1:23 pm

Wood produces volatiles that can ignite. Look up wood gasification. Steam can also erupt from less than well seasoned wood.
Carbon12
 
Stoker Coal Boiler: Keystoker KA-6
Coal Size/Type: Rice/Anthracite
Other Heating: Heat Pump/Forced Hot Air Oil Furnace

Re: puff back with wood stove?

PostBy: franco b On: Mon Feb 03, 2014 1:40 pm

i would give it under fire air as well. Wood when it reaches the charcoal stage is much like coal. Wood has far more volatiles than coal. Half is gas. Normally if the air is restricted the gas goes up the chimney as smoke which is the carbon particles in the gas which have precipitated out because there is not enough air or heat to burn them. When conditions are right they can burn all at once or explode. Obviously you have to change how the fire is being managed. Under fire air will better burn the charcoal and also probably provide more velocity and better mixing of the air and fuel.

You will just have to experiment to get the cleanest fire with a reasonable burn time as well as eliminating those puff backs. Too low a draft could also be a problem.
franco b
 
Hand Fed Coal Stove: V ermont Castings 2310, Franco Belge 262
Baseburners & Antiques: Glenwood Modern Oak 114
Coal Size/Type: nut and pea


Re: puff back with wood stove?

PostBy: freetown fred On: Mon Feb 03, 2014 1:42 pm

The only time I ever had BIG puff backs with my wood beast was if I forgot to close my MPD some after stuffing her full of new wood & there was a good wind????????????
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freetown fred
 
Hand Fed Coal Stove: HITZER 50-93
Coal Size/Type: BLASCHAK Nut/Stove mix

Re: puff back with wood stove?

PostBy: Carbon12 On: Mon Feb 03, 2014 1:46 pm

Hey Fred,....what's with the wood burner??? No wonder you use so little coal! :lol:
Carbon12
 
Stoker Coal Boiler: Keystoker KA-6
Coal Size/Type: Rice/Anthracite
Other Heating: Heat Pump/Forced Hot Air Oil Furnace

Re: puff back with wood stove?

PostBy: freetown fred On: Mon Feb 03, 2014 1:51 pm

She's just a conversation piece in the far back of the house( kinda my personal museum) :clap: toothy unless the kids & grandkids come up for ski-ing or boarding--then I fire her up--that used to heat the whole 2800 sq. It sat where the coal stove is now--7 full cord per season--she's a kick ass wood burner:)
freetown fred
 
Hand Fed Coal Stove: HITZER 50-93
Coal Size/Type: BLASCHAK Nut/Stove mix

Re: puff back with wood stove?

PostBy: Carbon12 On: Mon Feb 03, 2014 1:52 pm

Always good to have a back up to the back up system!!!
Carbon12
 
Stoker Coal Boiler: Keystoker KA-6
Coal Size/Type: Rice/Anthracite
Other Heating: Heat Pump/Forced Hot Air Oil Furnace

Re: puff back with wood stove?

PostBy: Lightning On: Mon Feb 03, 2014 1:54 pm

My coworker gets puff backs with wood. I don't intend to teach him coal burning... for obvious reasons :lol:
Lightning
 
Hand Fed Coal Furnace: Clayton 1537G
Coal Size/Type: Nut/Stove Size Mix

Re: puff back with wood stove?

PostBy: Carbon12 On: Mon Feb 03, 2014 1:56 pm

You might as well start burning coal! We KNOW how to prevent puff backs with coal :D
Carbon12
 
Stoker Coal Boiler: Keystoker KA-6
Coal Size/Type: Rice/Anthracite
Other Heating: Heat Pump/Forced Hot Air Oil Furnace

Re: puff back with wood stove?

PostBy: soultinter On: Mon Feb 03, 2014 2:53 pm

yea, lots of info on preventing puff backs w coal, not so much w wood.
I cant give it underfire air b cus i lined the bottom and sides with firebricks sooooo... not operational.
My wood is well seasoned, possibly too well according to one source ?
I have an exterior triple wall stainless chimney w 6" flue Flue on stove is 8" was told by many and hitzer people that would b a problem but i have never gotten great draft from it i suspect its b cus the prevailing wind blows from the west, hits the peak of my roof and blows "over" my chimney. wish i could draw a pic but less than ideal
soultinter
 
Stove/Furnace Make: hitzer
Stove/Furnace Model: 983 freestanding

Re: puff back with wood stove?

PostBy: Lightning On: Mon Feb 03, 2014 2:54 pm

Just give it more combustion air and use the manual pipe damper to slow it down.
Lightning
 
Hand Fed Coal Furnace: Clayton 1537G
Coal Size/Type: Nut/Stove Size Mix

Re: puff back with wood stove?

PostBy: freetown fred On: Mon Feb 03, 2014 2:55 pm

How high over your roof peak is the chimney?
freetown fred
 
Hand Fed Coal Stove: HITZER 50-93
Coal Size/Type: BLASCHAK Nut/Stove mix

Re: puff back with wood stove?

PostBy: freetown fred On: Mon Feb 03, 2014 2:56 pm

2 more questions--you have black pipe inside the house to ceiling??? do you have a MPD in that?? Do you have a cap on the top of the chimney?
freetown fred
 
Hand Fed Coal Stove: HITZER 50-93
Coal Size/Type: BLASCHAK Nut/Stove mix

Re: puff back with wood stove?

PostBy: freetown fred On: Mon Feb 03, 2014 2:58 pm

PS--I don't believe reducing to 6" is a problem--I went from 8" t0 6" on my wood beast & have never had a problem--I'm on top of a VERY windy hill
freetown fred
 
Hand Fed Coal Stove: HITZER 50-93
Coal Size/Type: BLASCHAK Nut/Stove mix

Re: puff back with wood stove?

PostBy: ONEDOLLAR On: Mon Feb 03, 2014 3:08 pm

I had a couple of puffbacks with wood in a Morso Squirrel in the early years with it. The stove had a very small firebox and when loaded with wood and not burning properly the smoke would have a hard time exiting. When enough air was introduced you could get a little "boom". Each time it happened it was my fault. As I didn't let the fire get established prior to dialing her back on the air. No damage ever resulted other than being forced to open a door or two and some windows to air the house out a bit.
ONEDOLLAR
 
Hand Fed Coal Stove: 2014 Chubby Prototype
Baseburners & Antiques: Crawford #2 Base Heater
Coal Size/Type: Nut/Anthracite