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Post by Vortex on Dec 30, 2013 10:43:20 GMT -8
Thanks for your input Pluton5, I'll have a read of that, hopefully google translation wont be to difficult to understand. Google English Translation It's all Polish coal that's available here in Ireland, we burn a lot of peat as well which is another dirty fuel that would benefit from a cleaner burn. Edit: Wow, there's 738 pages in that thread! Any chance you could paraphrase it for us?
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Post by pluton5 on Dec 30, 2013 11:38:19 GMT -8
vortex
do not worry about the amount of pages (738) hahaha ... because the subject is very vast, ............. , on the river, The fundamental issue in this forum is eco coal combustion in boilers for central heating. Each boiler has a specific structure and very individual working conditions. This consists of the construction of the boiler, (boiler upper combustion, lower combustion boiler) -heat exchanger of the boiler, -section of the chimney, -the length of the chimney, -quality fuel, fuel-granulation, -calorie ..... itd.itd So each boiler even the same brand and construction requires nico another way of smoking. It's generally about what is in this forum. Each boiler is sometimes considered individually because so many pages to read.
nice reading andrew
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Post by pluton5 on Dec 30, 2013 11:48:29 GMT -8
I know that this forum is about furnaces RS because it does not want to clutter up the thread of burning coal in the boilers, central heating, but if someone is willing to share experiences and show me the appropriate place to discuss I will be grateful
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Post by endrunner on Dec 30, 2013 22:48:56 GMT -8
We did some testing of burning coal in a rocket heater and it was not encouraging. I don't have my charts handy, but basically we had the dragon heater in high gear, temps a the top of the heat riser tower on a Derrick build were a nice 900-1000F, then we added coal, you could watch the temps just drive off a cliff. Very shortly they were at only 600F. It is the equivalent of the coal stage of wood. If you mix some wood then it's not too bad, but basically I think coal is not a good match and I don't really recommend it. If it is to be used at all, I think it needs some wood to keep the jets up.
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Deleted
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Post by Deleted on Dec 31, 2013 3:12:58 GMT -8
Very shortly they were at only 600F. It is the equivalent of the coal stage of wood. That is because rocket stoves do not have primary air by default, only secondary and tertiary air. Due to the high amount of volatiles in wood there is no need for primary air. 1.) Primary air goes from below through the coal bed. 2.) Secondary air goes through the fuel above the coal bed. 3.) Tertiary air bypasses the burn chamber and mixes with the burning gas behind. Fuel with lower amounts of volatiles needs primary air.
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jirp5
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Post by jirp5 on Jan 6, 2014 13:36:55 GMT -8
Suggest hunting you tube videos as I did go by one on a RMH that was being run as a pellet stove and as a coal stove. The major changes in design was the primary air was source from the floor of the fire box and that meant the top of the fire box had to be mostly closed with only a small hole where the coal or pellets fell in. Then they were using a gravity feed system to meter the coal and wood pellets in when running on those fuels. Knowing how bad coal is about bridging I would guess even then that they were having problems on coal.
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Post by Vortex on Jan 6, 2014 14:26:12 GMT -8
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jirp5
New Member
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Post by jirp5 on Jan 6, 2014 14:43:32 GMT -8
No there is another one yet. I am not finding it in a quick search. They showed a lot of pictures of how the feed tube worked in the other one to meter fuel. They had 3 gates in the tube to meter the fuel. 2 that metered the fuel and a sliding gate so the fuel feed could be shut off completely.
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Post by satamax on Jan 6, 2014 15:47:25 GMT -8
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Post by Vortex on Jan 7, 2014 8:21:24 GMT -8
That one fits Jirp5's description but he doesn't mention coal anywhere in the video.
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jrl
Junior Member
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Post by jrl on Jul 3, 2014 6:32:35 GMT -8
That one fits Jirp5's description but he doesn't mention coal anywhere in the video. I burn tons of it every winter to heat my house. A coal rocket will not work, IMO. There's no secondary combustion and all the heat radiates from the coal itself. There is a small amount of volatile gasses released from the coal in the first 20 minutes of burn, but they burn up on the top of the coal pile in the form of small blue flames. Coal burns from the bottom and requires cast iron grates and a good shaker grate system to get the ash out the bottom allowing more fresh, unburnt coal to come down into contact with the primary air supply from below. The exhaust temperatures of coal is something like 500-600F. The surface temps of my stove pipe is something like 250F, while the surface temperature of my stove is generally 400-600F. With anthracite (modern home heating coal), there is no smoke from the chimney, at all, ever. The exhaust is something like CO, small amounts of Sulfur Dioxide, and CO2. It's actually much better for the environment than burning wood in a traditional wood stove. You want to get the exhaust from coal to the outdoors as quickly as possible with the shortest run of stove pipe possible. If you have a really long tunnel for the exhaust to go through (like the bench concept or stratisfication in bells), the exhaust gases will drop too low in temperature and the system will stall. In short, it just won't rocket. That said, a lot of people with masonry fireplaces or old pot belly type stoves will throw some anthracite coal on top of the wood coals at the end of the night to get a good overnight burn. In your case, it won't hurt the stove because it's all masonry and refractory. In fact, coal will clean out your stove, eating away any creosote in your system. Just don't get any bituminous coal, that's the old nasty stuff from long ago that plumes smoke and soot. It's a different animal from anthracite coal. I go 8-10 hours between tending my coal stove. At night I load it up and my stove is running at 550F. I wake up in the morning and my stove is at 550F exactly how I left it, and 80% of the coal is burnt though. Load it up with another 20LB on top of what's left, shake out the ash, and you're good for another 8-10 hours.
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yaya
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Post by yaya on Jan 13, 2019 16:56:17 GMT -8
i sow a stove with used oil. it work great
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