Lignite Test in the 520

pozarns
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Post Tue. Mar. 02, 2010 2:17 pm

We have 2 pulverized coal fed 600MW units. Each boiler is fed from 8 pulverizers(coal is pulverized into powder, and then blown in with forced air)

-Jared

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009to090
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Stoker Coal Boiler: EFM 520 HighBoy
Hot Air Coal Stoker Stove: DVC-500 x 2
Coal Size/Type: Anthracite Rice
Location: Warrenton, NC

Post Tue. Mar. 02, 2010 2:58 pm

pozarns wrote:We have 2 pulverized coal fed 600MW units. Each boiler is fed from 8 pulverizers(coal is pulverized into powder, and then blown in with forced air)

-Jared
Welcome to the coal forum Jared. Wow, any chance you could post a few pics of those units?

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Tamecrow
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Stove/Furnace Make: Warden King Ltd.
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Location: Cape Breton, Nova Scotia

Post Tue. Mar. 02, 2010 6:58 pm

pozarns wrote:We have 2 pulverized coal fed 600MW units. Each boiler is fed from 8 pulverizers(coal is pulverized into powder, and then blown in with forced air)
GM manufactured Cadillac prototypes that burned powdered coal in the late 70's. :shock:

http://www.nytimes.com/2009/01/04/automobiles/04COAL.html

http://books.google.ca/books?id=ldgDAAAAMBAJ&pg=P ... ar&f=false

Terry


pozarns
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Post Wed. Mar. 03, 2010 11:55 am

Here is a site where there are some pictures of our plant, and also is a link to an article on our dryfining project out here.

-Jared

http://www.swce.coop/coalcreekphotos2007.php

http://bismarcktribune.com/news/state-and-regiona ... 002e0.html

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coal berner
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Stoker Coal Boiler: 1986 Electric Furnace Man 520 DF
Stove/Furnace Make: Electric Furnace Man
Stove/Furnace Model: DF520
Location: Pottsville PA. Schuylkill County PA. The Hart Of Anthracite Coal Country.

Post Thu. Mar. 04, 2010 4:32 pm

stoker-man wrote:The dried lignite is rated at 7000 BTU per pound, about the same as the wood pellet/corn mixture used in the Summer. I suspected that it was about the same. After burning for one hour straight, the total ash is less than a quart, burning at 11 teeth feed rate. I'll continue to burn the rest of the coal, about 13 gallons worth and measure the ash. I don't notice any sooting inside the boiler, but I'm sure the flyash is building up. There is no clinkering whatsoever and the ash is a fine white wood-like ash. As shown in the video, the coal pyramids and falls outward to the outer edge where it is almost immediately burned up.

The first video shows the burning fire in the 520 stoker





The second video shows that there is very little or no smoke at the chimney




This picture shows the flyash produced with the boiler running at full feed capacity, 22# per hour (anthracite weight) and the air setting at 4.
Lignite-experiment-flyash.jpg
This picture shows the lignite sample sent to us and is barely more than dust. Surprisingly, the dried sample cranks as easily in an 11 foot coal tube as does anthracite.
Lignite-experiment-coal.jpg
This picture shows the ash ring after burning all day.
Lignite-experiment-ash-ring.jpg
This picture shows the ash. It's as fine as sand.
Lignite-experiment-ash.jpg
At the end of the day, with about 120 pounds of lignite burned, the quantity of ash weighed 4 pounds and displaced about a gallon sized container, compared to about 13 gallons of original lignite.

The only comments I would add are that it is not easy to start a lignite fire. Some accelerant, such as kindling or wood pellets are needed and the flue pipes should be able to be easily undone for flyash cleaning. There was no problem with the fire going out with a 30 minute rest, so the timer should take care of that. Even though the lignite easily fed through the 11 foot pipe/auger, a shorter worm will reduce the chances of breaking sheer pins. Dry lignite is a must!
2.5Lbs Per hr is the feed rate per tooth with rice coal so 10 teeth max would be 25lbs per hr with buckwheat size coal it is 2lbs per feed rate per tooth 10 teeth would be 20lbs per hr

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