Question on gasifier secondary air flow

warno Posted By warno, Sep 10, 2017 at 5:07 PM

  1. warno

    warno
    Minister of Fire 2.
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    Jan 3, 2015
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    Loc:
    illinois
    How much air flow is actually supposed to flow to the nozzle area of a gasifier boiler? What is the rough percentage of flow to both primary and secondary air outlets?

    I'm in the process of converting my boiler to try to achieve gasification and I'm not sure how much flow i need into my secondary passage.

    Any help would be great thank you
     
  2. TCaldwell

    TCaldwell
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    Oct 26, 2007
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    I suspect the total airflow is based upon the boilers firing rate, I'm sure with some digging you can come up with a equation. If I recall you had ballparked your firing rate, if you can match that to a established gasified on the market with its airflow as a starting point. The other option is a small say 1/2 hp 3ph motor with vfd so you can find the sweet spot. Automation direct has matching vfd/motor combinations that have 120vac input, for reasonable money. With respect to primary /secondary air, the split size and moisture content and internal air ducting will dictate the optimum static positions. Feel free to call me, I have some spare parts that might help you.
     
  3. maple1

    maple1
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    Sep 15, 2011
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    Which I'd say, all means - make all air flows totally adjustable. Even just variations through the burn cycle, or for varying draft conditions on different days, or a different mix of wood in a load, can lead to you wanting to make some tweaks. Which gets into the beauty of a lambda system - but that would be another level...
     
  4. cumminstinkerer

    cumminstinkerer
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    Feb 2, 2016
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    Warren,
    If you get the air flow figured out let me know lol, I still cant get mine right all the time. fire me a text when you have a chance, I can give a refresher of what I have right now and what I am thinking after playing some yesterday. I am running for DHW on the weekends, just trying to conserve propane, and give me a chance to experiment when its not a must to have the thing running, I can let it go out and make changes this time of year.
     
  5. jebatty

    jebatty
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    A question of optimum in an ever changing burn scenario or "good enough" based on a relatively constant split size, species, typical wood load, and moisture content. And then how, where and how much air to feed both the primary and secondary burn chambers. I recall form the manual for my Tarm, now entering its 11th heating season, that uses a simple lever to adjust a constant total air flow between the primary and secondary, that the most practical answer for a simple system is "set it and forget it," which I have done. I rarely adjust the air flow from a setting which seems to be "good enough."
     
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  6. warno

    warno
    Minister of Fire 2.
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    Jan 3, 2015
    860
    232
    Loc:
    illinois
    A good enough setting would be great. I can always try to tune it in for better. I mean adding my storage last year helped a ton since I could batch burn, but it still smoked abit until everything got rolling good.
     

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