1. Welcome Hearth.com Guests and Visitors - Please enjoy our forums!
    Hearth.com GOLD Sponsors who help bring the site content to you:
    Hearthstone Soapstone and Cast-Iron stoves( Wood, Gas or Pellet Stoves and Inserts)
    Caluwe - Passion for Fire and Water ( Pellet and Wood Hydronic and Space Heating)

Gasification plans/homemade

Post in 'The Boiler Room - Wood Boilers and Furnaces' started by trydave, Nov 12, 2007.

Thread Status:
Not open for further replies.
  1. trydave

    trydave New Member

    Joined:
    Nov 11, 2007
    Messages:
    3
    Loc:
    St. CLoud,mn
    I wood like to build a gasification boiler or convert my outdoor wood boiler. I am getting way to much smoke and want to reduce woode usage. I have seen plans for a seton gasification boiler but thay want $700. Does anyone have plans or expierence that can help me. Thnaks

    Helpful Sponsor Ads!





  2. Nofossil

    Nofossil Moderator Emeritus

    Joined:
    Oct 4, 2007
    Messages:
    3,398
    Loc:
    Addison County, Vermont
    My brother built one from scratch with stainless heat exchangers. Came out nice, but it was a whole summer project. The controller can be a problem if you don't have the tools and experience to roll your own.

    Basic theory is simple, materials can be a challenge. The combustion chamber sees over 2200F, which is more than many refractory materials can handle. Gaskets must be perfect. The slightest leak in the gas generation chamber is a real problem.

    The gas generation chamber must be pressurized by a fan - preferably variable speed. He used a unit out of a pickup truck heater, and replaced the speed control switch with a set of relays. A portion of the air from the blower must be introduced into the combustion nozzle, and that fraction must be adjustable. Some sort of control system must manage the fan, circulation pump, and a recirculation loop that helps get the inlet above condensation temperatures quickly.

    If you copied the nozzle dimensions and geometry from a 'known good' design, you'd probably be all right.

    In summary, it's doable but it's a big project with some special challenges. Get a few friends with different skills to help. I can provide more details about what we did if you decide to go forward.

    Here's a link to some pictures of my brother's boiler as it was being built.
  3. Eric Johnson

    Eric Johnson Mod Emeritus

    Joined:
    Nov 18, 2005
    Messages:
    5,705
    Loc:
    Central NYS
    What that guy did just blows my mind when I think about it and look at those pictures. What a satisfying project.
  4. Eric Johnson

    Eric Johnson Mod Emeritus

    Joined:
    Nov 18, 2005
    Messages:
    5,705
    Loc:
    Central NYS
    If you could turn an OWB into a gasifier with a $700 retrofit, then there wouldn't be any more OWBs sold.

    The design differences are fundamental. I don't see how you could do it.

    I tried something similar with an add-on cat combustor to a conventional wood-fired boiler. I got the required stack temps (600+) but was never able to cut my smoke output, even though I suspect the cat was working to some extent. The first $100 takes the cat add-on.
  5. slowzuki

    slowzuki Feeling the Heat

    Joined:
    Feb 1, 2007
    Messages:
    485
    Loc:
    New Brunswick, Canada
    I've seen some plans a fellow had for casting / building a gasification/higher efficiency liner for a OWB. It had a section connecting to the stack, and the wood was up on a ceramic bed.
  6. rsnider

    rsnider New Member

    Joined:
    Nov 6, 2007
    Messages:
    117
    Loc:
    ohio valley
    Go to woodheat.org and in the owb page you can find a reply were a guy changed his owb to a more efficient boiler. It looks to me he had a classic "central boiler" and added firebrick and a fan on exhaust (he gives his data on wood usage and less smoke).

    hope this helps.
  7. antknee2

    antknee2 New Member

    Joined:
    Oct 7, 2007
    Messages:
    253
    Loc:
    NY
    The boiler is a absolute marvel of American ingenuity !!! please keep us updated on amazing machine . Thanks Anthony
Thread Status:
Not open for further replies.

Share This Page