Dealing with acid from coal

Dealing with acid from coal

PostBy: gerry_g On: Sat Dec 31, 2016 10:44 am

I believe it has been discussed that even the best quality coal is acidic and that causes both hopper corrosion and etching of the ceramic "glass".

This is just food for thought, would mixing a little powdered limestone with the coal before adding it to the hopper likely help or would it cause some unforeseen problem? Limestone acts as a buffer, reacting with acid, typically, if soaked in water a long time, the PH of the water would be mildly alkaline but "hard". It's sort of hard to overdue limestone (except for acid loving plants) since it is more a buffer, not constantly increasing alkalinity.

About 10 years ago my town started adding powdered limestone (not the caustic lime) to our water supply. Before that our hot water heaters lasted only 5-8 years and the copper plumbing in homes were constantly corroding and leaking after 15 years or so. Also, the copper piping would etch from the acid water and leave a green residue on showers and baths.

Just a thought - might limestone help, hurt or do nothing? I hate the hopper corrosion and "glass" etching.

gerry
gerry_g
 
Coal Size/Type: rice
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Re: Dealing with acid from coal

PostBy: freetown fred On: Sat Dec 31, 2016 10:51 am

Hard to tell. Try it & take notes. Get back with results. ;)
freetown fred
 
Hand Fed Coal Stove: HITZER 50-93
Coal Size/Type: BLASCHAK Nut/Stove mix

Re: Dealing with acid from coal

PostBy: lsayre On: Sat Dec 31, 2016 12:24 pm

Perhaps the various "bone" contaminants in coal can be replaced with a small and quantified amount of limestone measured to counter the nominal acidity. No idea what this might do. Might be ugly. Just thinking with my fingers.

Disclaimer: Do not try this at home. Needs a lab setting for trials first. Might just turn your ash bed into concrete, or worse... Likely will not neutralize coal acidity, although it is a base.
lsayre
 
Stoker Coal Boiler: AHS S130 Coal Gun
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Re: Dealing with acid from coal

PostBy: coaledsweat On: Sat Dec 31, 2016 1:28 pm

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Re: Dealing with acid from coal

PostBy: Doby On: Sat Dec 31, 2016 3:15 pm

etching glass with a stoker stove is a given I long gave up trying to clean/avoid it, use dry coal and you will have no hopper rust
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Hot Air Coal Stoker Stove: Alaska Kast console and Alaska Channing III
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Re: Dealing with acid from coal

PostBy: lsayre On: Sat Dec 31, 2016 4:19 pm

The only acid that I'm aware can etch (and even dissolve) glass is hydrofluoric (which I used to first analyze and later manufacture in my distant past). Every other acid up through concentrated sulfuric and aqua regia is stored in glass jugs. But then stove windows are not glass....
Last edited by lsayre on Sat Dec 31, 2016 4:21 pm, edited 1 time in total.
lsayre
 
Stoker Coal Boiler: AHS S130 Coal Gun
Coal Size/Type: Blaschak Anthracite Pea
Other Heating: Resistance Boiler (13.5 KW)

Re: Dealing with acid from coal

PostBy: freetown fred On: Sat Dec 31, 2016 4:21 pm

Bottom line still is--the proof is in the pudding!!!! Again, try it & get back with results. Hell, ya might have 8000 people doin it. ;)
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Hand Fed Coal Stove: HITZER 50-93
Coal Size/Type: BLASCHAK Nut/Stove mix

Re: Dealing with acid from coal

PostBy: gerry_g On: Sat Dec 31, 2016 8:10 pm

lsayre wrote:The only acid that I'm aware can etch (and even dissolve) glass is hydrofluoric (which I used to first analyze and later manufacture in my distant past). Every other acid up through concentrated sulfuric and aqua regia is stored in glass jugs. But then stove windows are not glass....


Correct, Leisure Line has confirmed it is ceramic and etched by acid from the coal. The acid (even mild) may contribute to hopper corrosion. Of course it will take a couple years to find out if it works.
gerry_g
 
Coal Size/Type: rice
Other Heating: Electric, Propane
Stove/Furnace Make: Leisure Line
Stove/Furnace Model: Pioneer LE Top Vent

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Re: Dealing with acid from coal

PostBy: freetown fred On: Sat Dec 31, 2016 8:42 pm

My HITZER hopper is 1/4 inch steel & don't have a lick of wear/rust/acid whatever, it's been used since the 90's. Had to replace the bottom boot due to wood over-firing.
freetown fred
 
Hand Fed Coal Stove: HITZER 50-93
Coal Size/Type: BLASCHAK Nut/Stove mix

Re: Dealing with acid from coal

PostBy: Hambden Bob On: Sun Jan 01, 2017 12:20 am

Doby wrote:etching glass with a stoker stove is a given I long gave up trying to clean/avoid it, use dry coal and you will have no hopper rust


Again,use dry coal and You'll not only avoid hopper corrosion,but You'll be allowing Your stove to operate like it should..... :sick: :up:
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