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Quick Rocket Stove

19 Feb

What goes good with a fresh baked applie pie? A rocket stove..why YES!

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..for those of you who might not know what a rocketstove is: (from wikipedia – http://en.wikipedia.org/wiki/Rocket_stove)

A rocket stove achieves efficient combustion of the fuel at a high temperature by ensuring a good air draft into the fire, controlled use of fuel, complete combustion of volatiles, and efficient use of the resultant heat. It has been used for cooking purposes in many third-world locales (notably Rwandan refugee camps) as well as for space and water heating.

A rocket stove’s main components are:

Fuel magazine: Into which the unburned fuel is placed and from where it feeds into the combustion chamber
Combustion chamber: At the end of the fuel magazine where the wood is burned
Chimney: A vertical chimney above the combustion chamber to provide the updraft needed to maintain the fire
Heat exchanger: To transfer the heat to where it is needed, i.e. the cooking pot.
The fuel magazine can be horizontal, where additional fuel will be added manually, or vertical, for automatic feeding of fuel. As the fuel burns within the combustion chamber, convection draws new air into the combustion chamber from below, ensuring that any smoke from smoldering wood near the fire is also drawn into the fire and up the chimney. The chimney can be insulated to maximize the temperature and improve combustion; according to studies this will increase efficiency by up to two percent more. In a rocket mass heater, the heat is passed into a suitable heat exchanger to ensure the efficient use of the generated heat.

For cooking purposes, the design keeps the cooking vessel in contact with the fire over the largest possible surface area. A pot skirt can be used to create a narrow channel that forces hot air and gas to flow along the bottom and sides of the cooking vessel. Optional baffles guide hot air and flame up the sides of the pot. For space heating purposes, the heat is transferred to a heat store which can, in some cases, be part of the structure of the house itself. The exhaust gases then pass out of the building via the chimney.

The design of the rocket stove allows it to operate on about half as much fuel as a traditional open fire and can use smaller diameter wood. If the stove is insulated and raised from the floor, the danger of children burning themselves is reduced. Some more recently designed rocket stoves are self-feeding, using gravity to add fuel to the fire as required.
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Not that we need a rocket stove seeing as how we have a cookstove..but after seeing one made I wanted one for myself..and the whole project took 1 hour so I am glad that we did it rather than have me keep thinkgin about doing it!

..another snow day..and with the weather outside being so frightful A* and I decided to do one of the projects that has been kicking around..a rocket stove. Most of the the materials for this we had on hand..metal cylinder, high heat adhesive, ashes ( for inside of can to act as insulation) but we did need to buy an elboy a couple of lengths of pipe..I wanted 3inch but was only able to find 4inch.

So the first thing is to draw out the outline of the pipe onto the side of the cylinder..drill a hole then cut out the area as best you can..taking a file and smoothing out any rough spots.

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Push one of the lengths of pipe in to the middle(ish) and attach the elbow..then rough out the cut you are going to need for the top.

At this point I attached all the pipe and made sure everything fit ok..then applied the high heat adhesive to the side.

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We had been saving our ashes (as opposed to putting the hardwood ash onto our flower beds) for around a month)..after the adhesive was set we filled in the inside of the cyliner with the ashes until it was full…some people use sand but ashes are a little lighter and as long as the inside does not catch fire you are fine.

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Pushed the top through the top hole..applied some more adhesive..and done!

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4 Comments

Posted by on February 19, 2013 in Construction

 

4 responses to “Quick Rocket Stove

  1. James Mackenzie

    February 19, 2013 at 9:31 am

    looks really cool – how big is that tin? do you have a pic of it in action??

    i don’t know when the burning wood goes!! more please!! ;-))

     
    • eagergridlessbeaver

      February 19, 2013 at 9:51 am

      the tin is a popcorn tin..about 18inches high…12 wide. I have not lit it up yet as A* won’t let me bring it in the house after it has been used..I will do up some action shots tonight..maybe cook supper on it if you are lucky! hehe

       
  2. Robin

    February 21, 2013 at 12:29 am

    Ah, dear ol’ Aprovecho and the rocket stove. I grew up in that town and all I knew about Aprovecho was there were a bunch of hippie’s living out in the woods. Old people and hippies don’t combine well. Though why the grumpiness from their part because Oregon seems like a state where you go to be a young hippie.

    I’ve been out to Aprovecho a few times when I was younger but I don’t remember it well. Lee wants to make a rocket stove too.

     
    • eagergridlessbeaver

      February 21, 2013 at 2:35 pm

      ..I have never heard of Aprovecho until you referenced it..neat stuff…my version is somewhat different but the idea is the same..

      ..we are sort of like Hippies to the locals..especially when our driveway is to screwed up and we have to walk in 300m!

       

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