What makes a klinker?

What makes a klinker?

PostBy: Got a match On: Wed Dec 04, 2013 1:48 am

Just started burnin coal and was wonderin what causes the klinkers and if there's a way to reduce them. They look like oyster shells and I poke the bed and lift them out. Burning stove coal in a Harmon sf 360 in NE Btitish Columbia.
Got a match
 
Stove/Furnace Make: Harman
Stove/Furnace Model: sf 360

Re: What makes a klinker?

PostBy: grumpy On: Wed Dec 04, 2013 1:58 am

Thats a great question..
grumpy
 

Re: What makes a klinker?

PostBy: Berlin On: Wed Dec 04, 2013 2:46 am

What causes clinkers? Answer: allowing the fuel bed to exceed the AFT (ash fusion temp.) of the coal.

Some coals won't even clinker in a (clinkering-type) underfeed stoker (designed to make the coal clinker to melt the ash down = reduce ash volume)

Some coals will clinker in hand-fired stoves under a good hot fire (or even not so hot) as you've found out.

typically, pyritic sulfur (iron) will give red ash coals which will give lower AFT's and a greater propensity to clinker under home heating use.


To reduce the likelyhood of clinkers showing up in your fuel bed DON'T poke or disturb coal bed from top, keep a DEEP fuel bed (8-14"+), and reduce the underfire air to the minimum necessary to heat the house. If following those instructions doesn't help, you may need a larger appliance for the coal you're burning - a larger stove will allow you to not have to burn it as hot.
Berlin
 
Hot Air Coal Stoker Furnace: Will-Burt Combustioneer 77B
Coal Size/Type: Ohio BITUMINOUS pea stoker coal

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Re: What makes a klinker?

PostBy: blrman07 On: Wed Dec 04, 2013 9:01 am

The general consensus is that klinkers form only in hand fired appliances. Nyet!!! I had a D&S stoker stove from Schylkill Haven Pa. that burned rice coal and it was a HOT momma. I was good with just about everything except rice coal from the old UAE mine. Every time I burned UAE coal the ash would fuse into a solid cookie and hang off the end of the grate. Sometimes it would be solid enough to stay together and come all the way out and hit the glass in the top door and not break off and fall into the ash pan below. Then the coal would back up on the top of the grate and spill over the sides.

UAE coal had a higher (than other coals) iron content and it would fuse in the ash. Only two ways I could keep that from happening. Mix the UAE coal with another coal and/or restrict the amount of combustion air to cool burn. Shame really. Spending money for something that worked too good and having to take steps to make it like everybody else's coal.

Rev. Larry
blrman07
 
Hand Fed Coal Boiler: Bucket a Day
Hand Fed Coal Stove: Vigilant Casting 2310
Baseburners & Antiques: rebuilding a 1906 March Brownback Double Heater, using a UMCO 1920's Pot Belly stove in the church
Coal Size/Type: Pea/Nut/Wood in the VC and anything that will fit in the Bucket a Day. It's not fussy.

Re: What makes a klinker?

PostBy: SMITTY On: Wed Dec 04, 2013 11:43 am

My ash always falls off the bed in one big clinkered chunk. Blaschak bagged rice. Sometimes it'll hang over the edge up to 5"!
SMITTY
 
Stoker Coal Boiler: Patriot Coal - custom built by Jim Dorsey
Hand Fed Coal Stove: Harman Mark III (not currently in use)
Coal Size/Type: Rice / Blaschak anthracite
Other Heating: Oil fired Burnham boiler

Re: What makes a klinker?

PostBy: Lightning On: Wed Dec 04, 2013 12:28 pm

The simple answer is that a clinker is ash that has fused together as a clump. In a hand fed, it can hide in the bottom of the coal bed just taking up space that could be better used for burning coal and/or block combustion air coming up thru the coal bed. Red ash tends to fuse more easily than white ash.

More good reading here.
Clinker Removal? Time to go Fishing!
Lightning
 
Hand Fed Coal Furnace: Clayton 1537G
Coal Size/Type: Nut/Stove Size Mix

Re: What makes a klinker?

PostBy: Got a match On: Wed Dec 04, 2013 5:23 pm

Great info. I'll quit pokin,turn down lower air in,and fill the box.
How do I know how much lower air to give?
Should I restrict upper air also?
Dialing her in, thx guys,big help!
Got a match
 
Stove/Furnace Make: Harman
Stove/Furnace Model: sf 360

Re: What makes a klinker?

PostBy: Lightning On: Wed Dec 04, 2013 5:40 pm

This is for anthracite. Bituminous is a different animal :lol:

Got a match wrote:I'll quit pokin,turn down lower air in,and fill the box.

Nice and deep, I like to keep 9-12 inches deep..

Got a match wrote:How do I know how much lower air to give?

Primary combustion air will dictate how hot it burns. You'll need enough to keep ya comfortable :D

Got a match wrote:Should I restrict upper air also?

A generous portion of secondary air should be used during the first 30 minutes or so after loading to burn off volatiles once the blue dancers show up. After that, close it down to just a hair width.

Got a match wrote:Dialing her in, thx guys,big help!

Trial and error, stay observant and learn from what you see. These basics are just a starting point 8-) Keep us posted on your progress :up:
Last edited by Lightning on Wed Dec 04, 2013 7:10 pm, edited 1 time in total.
Lightning
 
Hand Fed Coal Furnace: Clayton 1537G
Coal Size/Type: Nut/Stove Size Mix

Re: What makes a klinker?

PostBy: Got a match On: Wed Dec 04, 2013 6:40 pm

Good last answer
Me and my eye brows thank you
Got a match
 
Stove/Furnace Make: Harman
Stove/Furnace Model: sf 360

Re: What makes a klinker?

PostBy: Lightning On: Wed Dec 04, 2013 6:50 pm

Got a match wrote:Good last answer
Me and my eye brows thank you


Ut oh, did the puff back get you?
Lightning
 
Hand Fed Coal Furnace: Clayton 1537G
Coal Size/Type: Nut/Stove Size Mix

Re: What makes a klinker?

PostBy: Dennis On: Wed Dec 04, 2013 7:03 pm

If your from BC Canada,your most likely burning bit. coal,look in the bit section and read away.Welcome to the forum
Dennis
 
Hand Fed Coal Boiler: AHS/WOC55-multi-fuel/wood,oil,coal
Coal Size/Type: Anthracite/stove size

Re: What makes a klinker?

PostBy: Lightning On: Wed Dec 04, 2013 7:07 pm

Dennis wrote:If your from BC Canada,your most likely burning bit. coal,look in the bit section and read away.Welcome to the forum

Sheesh lol good point. I gave advice for anthracite. :lol:
Lightning
 
Hand Fed Coal Furnace: Clayton 1537G
Coal Size/Type: Nut/Stove Size Mix

Re: What makes a klinker?

PostBy: Duengeon master On: Wed Dec 04, 2013 9:04 pm

Dennis wrote:If your from BC Canada,your most likely burning bit. coal,look in the bit section and read away.Welcome to the forum

Yeah and go to Alberta to get it... No HST tax there!!! LOL!!
Duengeon master
 
Hand Fed Coal Stove: Harmon Mark III
Coal Size/Type: Anthracite pea and nut mix. Bituminous lump

Re: What makes a klinker?

PostBy: tcalo On: Wed Dec 04, 2013 9:22 pm

I was burning Blaschak last season and had tons of clinkers. I switched brands this year and haven't had one clinker, I've been drowning in ash though. I've been running the stove at the same temps as last season. I've been getting twice the ash, almost 2 full ash pans during shake down. It's amazing how different coal veins are! The clinkers were pretty easy to remove. I just dug them out of the top of the coal bed with my poker. Fyi, I am running a handfed.
tcalo
 
Hand Fed Coal Stove: Chubby Coal Stove
Coal Size/Type: Nut Anthracite

Re: What makes a klinker?

PostBy: Got a match On: Thu Dec 05, 2013 11:23 am

Read about bit coal after advice on this forum. Very informative.
We did get our coal out of Alberta. 40.00 bucks a ton.
Were on a quarter section which is a good thing cause this stuff stinks.
Fort St John this morning is - 30 cel. Stove is working great after advice from all you experienced coal guys. Reduced lower air and filled the box. Klinkers are golf balls now instead of grapefruits and not as many as before.I read in the bit coal section to run with no rain cap on chimney for draft which is good cause when we first fired up a gas explosion blew the cap off the stack anyways.
Thx again guys,there's no lookin back now!
Got a match
 
Stove/Furnace Make: Harman
Stove/Furnace Model: sf 360

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