Clinkers?
- Blackburn
- Member
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- Joined: Wed. Jul. 22, 2020 4:36 pm
- Location: Northern England, UK
- Hand Fed Coal Stove: Dunsley Highlander
- Coal Size/Type: Anthracite nut
Just giving the stove a shake and floss, and dug these out.
Take it they're clinkers? What causes them? Never really come across it before. Unusual.
Thanks in advance,
David.
- Sunny Boy
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- Hand Fed Coal Boiler: Anthracite Industrial, domestic hot water heater
- Baseburners & Antiques: Glenwood range 208, # 6 base heater, 2 Modern Oak 118.
- Coal Size/Type: Nuts !
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A few things can cause clinkers.
Depending on where it's mined, some coal is more prone to it than others, especially if it has a lot of iron in it - the rusty and black slag parts you see.
High operating temps are another cause. Above a certain temp burning coal becomes sorta soft and sticky. You can feel the difference when inserting a poker down into hottest parts of the firebed. Some call that the fusing temperature.
Pushing down on the firebed can also cause the heat-softened coal into clinker clusters.
Stove design can also contribute.
My range has a firebed that is only about 8 inches deep - it rarely gets clinkers.
My base heater parlor stove has a firepot with a foot deep firebed with a magazine above with a tall column of coal in it. Total height of that coal from the grates on up is about 30 inches. With a much hotter firebed and all the weight of that 30 inch stack of coal it gets a lot of clinkers.
Paul
Depending on where it's mined, some coal is more prone to it than others, especially if it has a lot of iron in it - the rusty and black slag parts you see.
High operating temps are another cause. Above a certain temp burning coal becomes sorta soft and sticky. You can feel the difference when inserting a poker down into hottest parts of the firebed. Some call that the fusing temperature.
Pushing down on the firebed can also cause the heat-softened coal into clinker clusters.
Stove design can also contribute.
My range has a firebed that is only about 8 inches deep - it rarely gets clinkers.
My base heater parlor stove has a firepot with a foot deep firebed with a magazine above with a tall column of coal in it. Total height of that coal from the grates on up is about 30 inches. With a much hotter firebed and all the weight of that 30 inch stack of coal it gets a lot of clinkers.
Paul
Last edited by Sunny Boy on Sat. Feb. 04, 2023 12:38 pm, edited 1 time in total.
-
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Those are beauties.
- Sunny Boy
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- Hand Fed Coal Boiler: Anthracite Industrial, domestic hot water heater
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- Coal Size/Type: Nuts !
- Other Heating: Oil &electric plenum furnace
He's in the running for best clinkers of the season.
Paul
- Blackburn
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- Location: Northern England, UK
- Hand Fed Coal Stove: Dunsley Highlander
- Coal Size/Type: Anthracite nut
Thanks fellas,
Stove runs between 275-400 standard temps, rarely over or under those figures. Firebed is max 8" deep, seems weird to come across them, as coal is from the same mine as always, and never happened before. Maybe just bad luck. Good to get rid though!
Cheers,
David.
Stove runs between 275-400 standard temps, rarely over or under those figures. Firebed is max 8" deep, seems weird to come across them, as coal is from the same mine as always, and never happened before. Maybe just bad luck. Good to get rid though!
Cheers,
David.
-
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- davidmcbeth3
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- Joined: Sun. Jun. 14, 2009 2:31 pm
- Coal Size/Type: nut/pea/anthra
Usually its running at high temps.
Shaking more often may help.
I blame the wifey myself.
Shaking more often may help.
I blame the wifey myself.
I am all about humor. The problem is most people don't find it funny while others find me seriously funny. Einstein wan't best known for his humor.
The coal I purchased from Penn Keystone hasn't had one clinker. But, man does it put rust stains on my concrete.Sunny Boy wrote: ↑Sat. Feb. 04, 2023 12:32 pmA few things can cause clinkers.
Depending on where it's mined, some coal is more prone to it than others, especially if it has a lot of iron in it - the rusty and black slag parts you see.
High operating temps are another cause. Above a certain temp burning coal becomes sorta soft and sticky. You can feel the difference when inserting a poker down into hottest parts of the firebed. Some call that the fusing temperature.
Pushing down on the firebed can also cause the heat-softened coal into clinker clusters.
Stove design can also contribute.
My range has a firebed that is only about 8 inches deep - it rarely gets clinkers.
My base heater parlor stove has a firepot with a foot deep firebed with a magazine above with a tall column of coal in it. Total height of that coal from the grates on up is about 30 inches. With a much hotter firebed and all the weight of that 30 inch stack of coal it gets a lot of clinkers.
Paul
-
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shh.
- Retro_Origin
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Clinkers are only problematic because of air or feed restriction, a nuisance item, they doesn't indicate poor quality or improper burn- if anything the reverse. Am I right in saying that? Or am I misunderstanding things?
- davidmcbeth3
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