Unburnt coal

Re: it's not necessarily unburnt coal.

PostBy: Richard S. On: Fri Feb 24, 2006 12:16 pm

nwaelder wrote:2) I have heard that "Banked" coal also will not burn. (I haven't personally seen it though, so I can't confirm). Years ago I'm told, the smaller fines (rice and pea) were not of use, so they were "Banked", piled up and left on the side. So the story goes, the banked coal is now being mixed in with freshly mined coal. After being banked for 75 years or so, all the volitiles in it have evaporated.


The rrice,buck&barley... was used for fill, commonly on railways so it was covered the entire time. Right up until someone realized you could burn it with a forced draft. Now it's the exact opposite and it's the rice which is in demand. As for how well it burns I really don't know, AFAIK all the coal I'm getting is freshly mined. They do test on site daily and have it tested off site periodically. It has to meet the specs or they can't sell it...

For what it's worth, I'm not sure I buy the banked coal explanation for unburned coal. I think that the grate design of all stokers I've seen are capable of burning pure carbon.


My guess is that it's the stoker factor, essentially you're forcing it to burn and it isn't given sufficient amount of time. As I've mentioned before the same coal burned in a hand-fired unit will burn up to nothing but dust...and I do mean dust... yet will have a chunky ash from the stoker. Same load of coal from the very same bin. Wish I had taken pictures when we had the hand fired unit running because you would not believe the difference, it was like night and day. The ash can even differ for us according to the season, the summer ash is without a doubt more fully burned than the winter... again it has more time to burn because there is little demand.
Richard S.
 
Stoker Coal Boiler: Van Wert VA1200
Coal Size/Type: Buckwheat/Anthracite

Re: Unburnt coal

PostBy: stovehospital On: Mon Nov 07, 2011 8:31 am

I have a coal sifter. It sits on top of a metal ash barrel. I just dump in all the ash and turn the handle. The ash drops into the barrel and the chunks roll through to the other end and drop back into the coal hod. I get back about 20% of the coal and just add it to the fire. These old coal sifters can be found in junk shops and antique shops. The last one I found was rescued from being a planter---works great. I have others that are simple screens in a frame that hooks onto the barrel rim. They work well but you will quickly learn to stand upwind when using one. I'll send some photos if anyone wants some. Emery
stovehospital
 
Stove/Furnace Make: 250 stoves in barns
Stove/Furnace Model: #6 Herald baseheater

Re: Unburnt coal

PostBy: freetown fred On: Mon Nov 07, 2011 9:01 am

Emery, how bout a pix? ;) I'd like to see it/them. :)
freetown fred
 
Hand Fed Coal Stove: HITZER 50-93
Coal Size/Type: BLASCHAK Nut/Stove mix


Re: Unburnt coal

PostBy: stovehospital On: Wed Nov 09, 2011 7:55 pm

Here are some photos of an ash sifter. IO use one to sift my coal and recycle the stuff that does not fall throughg. You would be surprised at what does not get burn t on the first pass. Thge photo is in a work area so ignor the stoves in the background
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stovehospital
 
Stove/Furnace Make: 250 stoves in barns
Stove/Furnace Model: #6 Herald baseheater

Re: Unburnt coal

PostBy: freetown fred On: Wed Nov 09, 2011 8:11 pm

By God, that looks like it would work smoother then a lil baby's butt. Thanx for the pix my friend :)
freetown fred
 
Hand Fed Coal Stove: HITZER 50-93
Coal Size/Type: BLASCHAK Nut/Stove mix

Re: Unburnt coal

PostBy: bobcat10_4 On: Wed Nov 09, 2011 8:33 pm

I myself have had unburned coal in my Kerr; You can "recycle" it by taking 1/4" mesh from a auto parts store, cutting it so it fits inside your ash bucket, and sifting it. Move it around on the mesh while your sifting or "shaking" the bucket.
Bobcat
bobcat10_4
 
Stove/Furnace Make: HS Tarm
Stove/Furnace Model: 303

Re: Unburnt coal

PostBy: nortcan On: Wed Nov 09, 2011 8:35 pm

I would like to know from where comes from that 20% unburnt coal? Seems a lot of unburnt coal?
nortcan
 
Stove/Furnace Make: Stuart,Peterson/ Grander
Stove/Furnace Model: Sunnyside/ Golden Bride

Re: Unburnt coal

PostBy: stovehospital On: Wed Nov 09, 2011 8:49 pm

I think it is stuff that falls through the grate before getting burnt properly. The other possibility is too much grate shaking causes some to drop through
stovehospital
 
Stove/Furnace Make: 250 stoves in barns
Stove/Furnace Model: #6 Herald baseheater

Re: Unburnt coal

PostBy: nortcan On: Wed Nov 30, 2011 10:29 pm

I still wonder why with stoves, oops, the best stoves there are about 20% of anthracite lost in the ash pan? Does it means that 20% reduces the stoves' efficiency of 20%?
Anyways, there is a 20% not burned. Is it normal? With the best stove ....having to play in the ash to find the 20% unburned ant. seems not normal.
Not complete combustion seems the first thing to consider and study.
nortcan
 
Stove/Furnace Make: Stuart,Peterson/ Grander
Stove/Furnace Model: Sunnyside/ Golden Bride

Re: Unburnt coal

PostBy: Cyber36 On: Thu Dec 01, 2011 1:51 pm

I say 10% is a better guesstimate...........
Cyber36
 
Hand Fed Coal Stove: Marathon/Logwood

Re: Unburnt coal

PostBy: nortcan On: Thu Dec 01, 2011 9:59 pm

Cyber36 wrote:I say 10% is a better guesstimate...........


Emery wrote :"about 20%". (few posts before this one)
Anyway, 10% makes : 400 Lbs for 2 tons
20% "" : 800 Lbs for 2 tons
We all try to get the best anthracite to BURN not to send it unburnt in the ash pan ?
Are the grates at the best they can be? Not sure!
nortcan
 
Stove/Furnace Make: Stuart,Peterson/ Grander
Stove/Furnace Model: Sunnyside/ Golden Bride

Re: Unburnt coal

PostBy: wsherrick On: Thu Dec 01, 2011 10:05 pm

I have very little unburned coal in my ash pan. With either Glenwood: The No 6 with the prismatic grates or the Glenwood No 9 with the standard round shaker grate. I use the largest sized coal the stove will take and do not over shake the grate. The No 9 Glenwood leaves nothing but powder in the ash pan.
I think often that it is not the grate that is faulty but the operator's method could be improved upon.
wsherrick
 
Hand Fed Coal Stove: Glenwood Base Heater, Crawford Base Heater
Baseburners & Antiques: Crawford Base Heater, Glenwood, Stanley Argand
Coal Size/Type: Chestnut, Stove Size

Re: Unburnt coal

PostBy: stovehospital On: Thu Dec 15, 2011 7:58 am

That is exactly what I find. My #6 Herald is similar to the #6 Glenwood and drops more coal. My Magee is similar to the #9 Glenwood and the coal goes right to dust. I sift the stuff from the #6 and burn it in my shop with the Magee. It,too , ends up as dust.
stovehospital
 
Stove/Furnace Make: 250 stoves in barns
Stove/Furnace Model: #6 Herald baseheater

Re: Unburnt coal

PostBy: backwoodbill On: Fri Dec 21, 2012 11:21 am

hello all!
this is my first year burning coal and have experienced a wide learning curve on clean coal burning I tried reclaiming unburnt coal with two different sifting methods first one was using a fryolator fry basket shaking it into a vintage ash can it worked great and the second way one of those mailbox shaped hand cranked squirrel cage sifters that sit on top of the ash can i have it also worked great and was extremely fast compared to the fry basket method next i tried burning it with success by putting a light layer over freshly stoked coal and it did burn the draw back was it would fuse together into very large clinkers which caused me to have to take the poker to it and we all know that to leave a well established bed of coal alone but i had to poke it as a lot of the time it would create a crust sheet that would be some where around the middle depth of the coal bed resulting in when you shook down the coal bed it would prevent the top layer from properly shaking the ash down not to mention how bad it would jamb the grates by the way i have a harman mrk II hand fed so from there I had gone away for three days and when i got back i completely emptied out all the ash even on top of the grates and started out fresh and built a new bed of coal and observed when it came time to shake it down to my amazement it was about 95% fine powder ash and the grates operated smoothly I was impressed with that so much i deemed it not woth my time to any longer sift the ashes to save very little unburnt coal it is better recycled in my roads pot holes and spread on ice to gain traction and spare myself being on the brink of an asthma attack from sifting it and that was doing it outdoors with the wind to my back! so ultimately the only gain i got out of all that labor was exercise and time passed as iam retired so take what i say for what it is worth who has the time realistically in these financial times to waste when theres a living to be made!
backwoodbill
 
Stove/Furnace Make: harman
Stove/Furnace Model: mark II