It's a 30 gallon barrel. With the chimney that's on it, one full load burns about an hour and a half.
I've thought about building an whole kitchen setup (for a restaurant) that these could plug into.. Imagine an oven that you can plug these into the bottom of.. Wok cookers with slightly smaller chimneys for longer burn times.. The barrels would need good long handles so they could be tipped, dumping the hot coals directly into a BBQ pit.
Right?? My thought is that there would need to be a dolly designed to move them into place. Once set, push the lever to raise the stove into position or lower it to disengage. Another setting to set the thing down on the ground to put it out and store the charcoal for later.
Curious too... Are there air inlets in the bottom of the barrel, or would that cause runaway combustion? I built a small one of these for camping/tea billy heater, but am thinking of upgrading my old two-barrel charcoal retort.
The bottom of the barrel is has a lot of small, nail holes spaced a couple inches apart, all over it. Just enough air comes in the bottom to pyrolyze the wood load in the barrel, not enough air to create a raging flame. The stove needs to be elevated off the ground for those air holes to work, I set it on bricks. There is a riser of sorts (no insulation) on top of the barrel that has secondary air holes in it. When this secondary air mixes with the smoke coming out from below, it ignites, making for a BIG flame. The secondary air sizing is really important to get right. I experimented a lot with it, made a few too many holes at first, then made a sleeve that could slide up and down the pipe, selectively covering holes till it burned properly (you can sort of see the sleeve in the image). Once I figured out the setting, I flipped the pipe over, made the RIGHT holes below and cut the test holes open to use as a pot-stand..
The stove is a gassifier and like most of them, it is filled with wood completely before lighting. It's pretty fuel sensitive, it needs all the same type of wood (in any given load); the wood needs to be VERY dry and all rather small, similarly sized pieces or it won't burn properly. When all of the woodgas has burnt off, the flame will go out; at that point, the stove is taken off of the bricks (I've welded on handles), placed on the ground, the chimney comes off and a cap is placed on top of the barrel. I'll kick a little dirt around the bottom to make sure it's close to air-tight. After the barrel cools down completely, the charcoal is ready to take out.. One full load of wood will make about one half a barrel of charcoal, hardwoods a little more, softwoods a little less.
I think I need to take more detailed pictures of the stove and post them here.. The one that I posted above is pretty poor..
Kind of what I imagined from your description. Earlier you stressed having a consistent size and type of fuel, and I am wanting to try this with the outer barrel that I use for making charcoal currently. I typically work hardwood chunks down to about the size of a hens egg, which isn't hard with all the straight grained ash standing dead in the Midwest. I like the idea of using the combustion for a purpose like cooking.
dan1941300: Hi, I want to build nearly the same stove like you did a little bigger 1 brick every side more to put 10 cm Isolation more in inside. Please could you measure up all sizes also from the hot water tank (maybe you know how many liters the tank has) thx
May 11, 2018 9:13:45 GMT -8
dan1941300: If possible in metric cm, how many Celsius at the chimney? Is there anything you would do different if building again? Sorry for my bad english, my language is german, austrian. thx a lot
May 11, 2018 9:38:02 GMT -8
smarty: Dan my batchbox reached 1150C so refractory cement rated to at least 1200C
May 21, 2018 22:53:56 GMT -8
mercedes: Not sure where this question will end up...I just registered. HOW THICK SHOULD PERLITE/VERMICULATE/CLAY INSULATION BE BEHIND THE THERMAL BATTERY/COB BENCH IF IT BACKS UP TO A STRAW BALE WALL? Thanks! Can you please also post me: firstname.lastname@example.org thnx!!
May 28, 2018 20:05:23 GMT -8
kkp: Mercedes: Benches don't get real hot. In fact, they are rather cool compared to other areas. You shouldn't need a mix like you described
Jun 7, 2018 18:10:52 GMT -8
maartenmartens: beste Peter, ik heb je eergisteren een mail gestuurd via het contact formulier op je website , heb je die goed ontvangen ? mvg Maarten Martens, architect - geobioloog (mail betreffende de bouw van onze eigen RMH)
Jun 20, 2018 13:21:57 GMT -8
martinm: any one here with info \ experience with heat (from a mass heater) distribution with ducts throughout two storey house ?
Sept 8, 2018 22:58:52 GMT -8
padica: Good morning, this is a wonderful subject, please someone can help me with the theme of double and triple combustion, how it is achieved, theory and design, thank you
Sept 15, 2018 7:13:40 GMT -8
wiscojames: I'm afraid you won't get a response to such a vague question - I suggest reading through some of the threads related to your questions before asking for an explanation. People will be very generous with their knowledge if your question is more specific.
Sept 18, 2018 4:48:00 GMT -8
daniel: in my experience as I am working now on something of that nature, I have thought of making a heat exchanger and distributing the heat through vents using a slower fan. Now after a few years I realize that mass heaters give out primarily radiant heat, for
Nov 30, 2018 12:48:38 GMT -8
coastalrocketeer: Anyone posting in this shout box... if you have something you want people to see and respond to, create a thread in the appropriate forum section... this is not the place...
Dec 16, 2018 18:10:49 GMT -8
vesuvius: High Temperature Glass options,
Jan 4, 2019 16:28:17 GMT -8
vesuvius: Do any of you have experience with using the glass from home oven doors on a rocket stove? I'd like to have a viewing port on my stove but don't want to fork out for new ceramic glass. Any thought as to whether it would take the heat of a rocket stove?
Jan 4, 2019 16:30:40 GMT -8
yaya: you dont need the blowair for that temp..
Jan 13, 2019 16:43:57 GMT -8
flybywire: Glass window from an old washing machine is designed to take high temps. Cheap solution to your need.
Jan 27, 2019 0:10:58 GMT -8
coastalrocketeer: Anyone posting in this shout box... if you have something you want people to see and respond to, create a thread in the appropriate forum section... this is not the place to have a discussion... it is for short announcements
Feb 7, 2019 0:11:23 GMT -8
coastalrocketeer: you won’t likely get replies to questions here, and it is not a spot that makes holding an ongoing discussion possible...
Feb 7, 2019 0:12:22 GMT -8