KA6 Coking up in the Grates

Stoker Coal Boilers automatically feed the coal and have controls and pumps just like any conventions boiler. They are intended to be used as a primary heat and often have domestic hot water coils as an added bonus. They can be set up independently or in dual sytem with your existing oil/gas boiler. They can accommodate both hot water base board or steam plumbing.
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BennyLumpkin
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Stove/Furnace Make: Keystoker
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Post Tue. Jan. 28, 2014 7:03 am

Burning Millard and a little bit of Blaschak that's in my bin. I keep having my ash/coal bed coke up then not push off and then it stacks up and pushes coal over the sides. ... why?

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BennyLumpkin
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Post Tue. Jan. 28, 2014 7:22 am

If my reference to coking up doesn't make sense. .... what it's doing is burning into a solid clump and then won't push off the grate. It's hit and miss when it does it but usually in extreme cold when it's running longer.

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oliver power
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Post Tue. Jan. 28, 2014 7:23 am

Coal a little wet/damp? Friction on grate? The carpet on my Kaa-2 is more flat than your Ka-6. I don't have any problem. Dry wet/damp coal. Maybe sand grates. Any wax, or any other residue on grates from starting fire? Maybe try Buck size coal. I burn buck.

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blrman07
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Post Tue. Jan. 28, 2014 7:28 am

Your getting what I call clinker cakes. When your running your unit hard and burning a coal with a lower ash fusion rate, the ash will actually fuse together from the heat into a solid cake. This usually happens with coal that has a higher iron content or what is referred to as red ash coal. The fix is to mix in some buck or back off the air so it doesn't burn quite so hot. The long term fix is to blend in some white ash coal or coal that is lower in iron content.

This is not due to anything your doing and you don't have a problem with your Keystoker. It's the nature of the beast with higher iron content ash that is burned HOT in this cold weather. When the weather warms up a tad and it's not running so hard it will more than likely go away on its own.

Rev. Larry
New Beginning Church
Ashland Pa.
Rev. Larry
Ashland Pa.

1 John 1:9... If we sin and we confess that sin He is faithful and just and will forgive us and cleanse us from all unrighteousness.

waldo lemieux
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Post Tue. Jan. 28, 2014 7:43 am

Ill bet if you mix in some wood pellets that will work also :yes:
When faced with a seemingly impossible task, my grandfather always said "can't never can, untill try comes along"

BennyLumpkin
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Post Tue. Jan. 28, 2014 8:35 am

I'm needing to get coal this weekend. I've been burning Mallard (Harmony) and I had tried Blaschak which I hated.....I drive from Central PA so I can go pretty much anywhere. Any suggestions? It never did this with the old Harmony coal.

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McGiever
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Post Tue. Jan. 28, 2014 9:03 am

Best to call ahead for who will have your coal...stockpiles are maybe low at breakers cause dealers are replentishing their stockpiles and breakers can't operate in these temps.

As w/ all heating fuels, supplies are dwindling. :o
SLOW AND STEADY WINS THE RACE

BennyLumpkin
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Post Tue. Jan. 28, 2014 9:14 am

That's what had me worried. ....I just want good coal. Mallard does ok until it's below 10 then it seems to cake up.

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McGiever
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Post Tue. Jan. 28, 2014 9:30 am

Remember, someone said to try some Buck and/or back off the air a little. ;)
It's not all the coals fault.
SLOW AND STEADY WINS THE RACE

BennyLumpkin
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Post Tue. Jan. 28, 2014 12:10 pm

I'm not sure how much to back the air down. My draft is having perfect. I'm picking up buck from a local guy. .... he sells Blaschak but I'll give it a try. Will I need to make any major feed our air adjustments with the change?

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McGiever
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Location: Junction of PA-OH-WV

Post Tue. Jan. 28, 2014 12:21 pm

No, nothing major. Just do your usual manometer tweaks for draft after a 1/2 hr. steady run.
Then adjust the feed to proper position near end of grate.

Blaschaks usually has a higher fusion temp so you shouldn't see anymore "clinker cookies". :)
SLOW AND STEADY WINS THE RACE

BennyLumpkin
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Post Tue. Jan. 28, 2014 8:32 pm

So I'm giving some buckwheat a try. Cleaned out all the rice and got it burning with buck and adjusted my air and damper to get my draft right after I had a normal coal bed and it's coking up again. When I cleaned the rice out I cleaned the whole boiler out do nothing is on the grates. What gives?

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blrman07
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Hand Fed Coal Boiler: Bucket a Day
Hand Fed Coal Stove: Vigilant Casting 2310
Coal Size/Type: Pea/Nut/Wood in the VC and anything that will fit in the Bucket a Day. It's not fussy.
Location: Girardville Pa.

Post Wed. Jan. 29, 2014 4:03 am

If your clinker cakes didn't go away with switching to the buck then you need to back off the air flow a bit and cool the fire down. I always had clinkers when I ran the UAE original. Your coal may just have a higher iron content. If you can get to the Keystone Anthracite site on Route 54 in Girardville Pa. Their coal has a lower iron content and I don't get clinker cakes anymore since I started using their coal.

What you got to lose right? Give it a try. Always remember, mileage may vary based on individual usage and performance.

Rev. Larry
New Beginning Church
Ashland Pa.
Rev. Larry
Ashland Pa.

1 John 1:9... If we sin and we confess that sin He is faithful and just and will forgive us and cleanse us from all unrighteousness.

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Rob R.
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Post Wed. Jan. 29, 2014 5:16 am

How much ash is on the end of your grate at full load?

Air will go through the buck easily, turn it down until the fire stops just before the last set if air holes on the grates. (Do this when the stoker has been running hard for about 30 minutes)

BennyLumpkin
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Post Wed. Jan. 29, 2014 7:13 am

Which air are you referring to? The fan that runs all the time or the flapper on the bottom?

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