Ashes do not shake down

Ashes do not shake down

PostBy: mal91152 On: Sun Jan 04, 2009 6:34 pm

I need to pick the brains of this site. When I run my Stelrad boiler on nut coal or pea coal the ashes do not drop down, they need to be proded, then they drop fine. I have tried shaking different times, running slow, and different size and type of coal. Pea coal seems to be better but not perfect. Any help would greatly be appreciated. :?: :?:
mal91152
 
Stove/Furnace Make: reading stoker

Re: Ashes do not shake down

PostBy: coaledsweat On: Sun Jan 04, 2009 7:26 pm

I'll guess you have a V shaped firebox, this is a common problem with the design as the fuel wedges itself as it collapses from the previous shake. The solution is what you are doing.
coaledsweat
 
Stoker Coal Boiler: Axeman Anderson 260M
Coal Size/Type: Pea

Re: Ashes do not shake down

PostBy: mal91152 On: Sun Jan 04, 2009 7:34 pm

No fire box is square about 18" x 18"x18"deep. i can put at least 80 lbs in as a full load.
mal91152
 
Stove/Furnace Make: reading stoker

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Re: Ashes do not shake down

PostBy: Devil505 On: Sun Jan 04, 2009 7:38 pm

mal91152 wrote:When I run my Stelrad boiler on nut coal or pea coal the ashes do not drop down, they need to be proded, then they drop fine.


This is a problem common to all the stoves & coal I have ever used, after the fire has been running for about a week. It's called "bridging" & the top of the firebed acts like the crust of a cake. You can shake down & accomplish nothing but mainly moving air below the crust .(brfdge) My procedure is to poke down into the top of the bed (in a number of places) after I have livened up the fire by opening the ash door for a few minutes. Often times, when you poke down, you will see the crust collapse into the air pocket below the crust & then you can shake it down & have room for fresh coal to fill the air pocket. Sounds like you are already doing that so just keep it as part of your normal procedure.
Devil505
 
Stove/Furnace Make: Harman
Stove/Furnace Model: TLC-2000

Re: Ashes do not shake down

PostBy: MountainPreacher On: Tue Jan 13, 2009 6:50 pm

One thing I have found with the similar problem is to open the bottom door and let the stove heat up to 4-500, throw on some coal, enough to cover over the whole bed, let that coal get started good and then shake the ashes. Putting the layer of coal not only helps to break the bridging on top, it also gives you a good start for the coal you will add once you are done shaking out those ashes.
MountainPreacher
 
Stove/Furnace Make: Harman
Stove/Furnace Model: Magnafire Mark II

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