Question Regarding Bituminous and Anthracite Coal

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Rex
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Post Sun. Nov. 06, 2011 3:25 pm

Hello,

Do most electrical coal plants burn bituminous or anthracite coal? Also would you have any information (preferably a link) that compares the two coal properties when it comes to their burning properties. Meaning how one might burn cleaner than the other. I'm looking at the differences (in number percentages) in their burned gases, etc...

Thanks

Rex

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lsayre
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Post Sun. Nov. 06, 2011 3:29 pm

Electrical companies burn bituminous. There is far more of it available than anthracite, and it costs quite a bit less.

As I understand it (from lessons learned here on NEPACrossroads) bit has a lot more volatiles and stinky sulfur, and it smokes way more. Bit burns primarily with air from above. Anthracite burns primarily with air from below, and is virtually smoke and odor free. Good bit coal can have more BTU's per pound than anthracite. Stoves designed for one will not work well with the other.
-Larry

Democracy rests upon the principle that collective wisdom arises from a pool of individual ignorance. A Republic rests squarely upon objective law, and fundamentally upon those laws which restrict the scope and actions of government.

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Rob R.
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Post Sun. Nov. 06, 2011 3:32 pm

By far, most of the coal burned for electrical generation is bituminous. In practice, I think the emissions from the two types of coal are pretty close considering the exhaust scrubbers on the bituminous burning plants. In a residential coal-burning appliance, anthracite burns noticeably cleaner...the difference is most noticeable in hand-fired equipment, less in stokers.


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lsayre
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Post Sun. Nov. 06, 2011 5:12 pm

If you intend to burn bit in your your DS Machine 1500 you should ask Amos at DS Machine (717-768-3853) to make you a door for it with "functional over the fire air controls" (functional as opposed to decorative air inlet knobs that are adjustable and allow air to come in from above the fire). He might even consider taking your original door as a trade in for the new one? With that door you should be able to burn both types. Close down the air controls over the fire for anthracite, and open them up some (to perhaps a bunch?) for bituminous.
Last edited by lsayre on Mon. Nov. 07, 2011 2:35 am, edited 2 times in total.
-Larry

Democracy rests upon the principle that collective wisdom arises from a pool of individual ignorance. A Republic rests squarely upon objective law, and fundamentally upon those laws which restrict the scope and actions of government.

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Berlin
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Post Sun. Nov. 06, 2011 9:48 pm

Powerplants burn Bituminous coal. In large industrial settings bituminous coal has properties that are valued over anthracite including grindability, lower ash, and faster rate of combustion - even for pulverized coal.

In properly tuned stoker firing bit and anthracite both burn very clean with a slight edge on maximum achievable combustion efficiency going to bit coal; both being burned properly, bit coal and anthracite will produce very similar levels of emissions across the board with some bit coals having slightly higher sulfur.

In a hand-fired stove bit coal will produce more soot and hydrocarbons in the exhaust gasses and anthracite will produce more CO. An excellent bit coal will have more heat and less ash than anthracite, but you will always have some soot when hand-firing bituminous coal. As far as any toxic elements in the coal or the ash, it's basically the same across the board east of the Mississippi between anthracite and bituminous coal. The toxic elements and compounds in coal/coal ash are basically the same trace elements that are in the soil all around you, and they're at basically the same levels.
Attachments
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Kentucky bituminous coal at low burn in my hand-fired stove
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smokeless bituminous coal combustion in a home-heating stoker
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Kentucky bituminous burning in a fireplace - there will be light grey smoke.
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Bituminous coal smoke from hand-fired stoves
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Bituminous coal burning w/ smoke in my stove
Burning western Pennsylvania Bituminous in WNY using model 77 stoker furnace. BITUMINOUS equiptment: 2 hand fired stoves of my own design, Many Combustioneer Model 77 stokers, stokermatic furnace, Many Will-Burt stokers, & and Two Iron firemen.

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Post Mon. Nov. 07, 2011 10:59 am

Actually a lot of power plants burn sub-bituminous. See attached link. Powder River Basin coal is popular due to low sulfur and ash. According to the link, it supplies about 40 percent of the coal fired power plants.

https://en.wikipedia.org/wiki/Powder_River_Basin
Steamup

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lsayre
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Post Tue. Nov. 08, 2011 7:38 pm

Another thing to consider with your DS-1500 Circulator is that you will need to remove the hopper if burning bituminous coal. Hoppers are a total no-no with bit coal.
-Larry

Democracy rests upon the principle that collective wisdom arises from a pool of individual ignorance. A Republic rests squarely upon objective law, and fundamentally upon those laws which restrict the scope and actions of government.

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Rex
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Post Sat. Nov. 12, 2011 5:45 am

thanks for the reply's although Im not interested in burning bit coal in my 1500. Im very interested in sound studies showing the different properties the two different coals produce when they are burned. Lots of post without any links from any studies?? Again this would help and thanks again.

Rex

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Ashcat
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Post Sat. Nov. 12, 2011 8:29 am


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