Lanny a few comments inserted below. Jock Gill P.O. Box 3 Peacham, VT 05862
Cell: (617) 449-8111 :> Extract CO2 from the atmosphere! <: Sent from my iPad > On Oct 5, 2013, at 9:49 AM, Lanny Henson <[email protected]> wrote: > > Another problem with a concentrator ring is that it blocks the radiant heat. > If you are using a fan you should have enough velocity to mix inside the > burner. > Having enough velocity without a fan is more of a challenge. I use a low > friction airflow path and draft and I am able to get mixing below the pot. > Instead of using a concentrator ring in my SLC I do the opposite. The burner > increases in diameter at the top to give the pot a larger "radiant view" of > the fire. I get about the same effect in my Modified Weber. The shape of the kettle is very useful, but not required at all. > If the air enters the burner in a near tangential way you will get a fire > tornado and a tall flame and that is also a problem. This can be the case. My secondary air slot does introduce secondary are tangentially to the fuel chamber. The tornado effect is good for turbulence, but a central spire of flame is usually full of soot, so I avoid these. My deflectors appear to control this well. > I am testing a stove today using different types of wood. Have you tried other forms of biomass? Cherry pits? Grass? etc? Cheers, Jock > Lanny > > ----- Original Message ----- > From: Crispin Pemberton-Pigott > To: 'Discussion of biomass cooking stoves' > Sent: Saturday, October 05, 2013 8:56 AM > Subject: Re: [Stoves] The time-temperature-turbulence equation > > Dear Jock > > >When I read your "In the time-temperature-turbulence equation" lights went > >off. > > I would rather hear they went on. > > You are quite correct in your analysis, though be careful about generalising > on the other approach. > > >I expect this is why my iCans with three washers as deflectors, in contra > >distinction to a "concentrator ring", burn cleaner. > > Correct, with the proviso that the concentrator ring could be better it is > broke the incoming (lateral) flow towards the centre into jets. The point is > to get turbulence while not shortening the residence time 'at temperature'. > The easiest way improve the concentrator ring is not to have one in the first > place, but to create the same effect using hot secondary air jets. The result > is you can drop fuel in without hindrance and there is one less part to make. > > If the ring is a necessity, make it using a concertina-forming tool so the > gas flow is divided. Anything to make it not be a smooth flow like water > going down a round hole with a radiused edge. > > This is particularly important when the excess air level is low because it is > hard for the H and C to find O2 when it is in short supply without turbulence. > > >They are essentially soot free. Perhaps "soot free" should be a goal? > > Correct again. > > Regards > Crispin > > _______________________________________________ > Stoves mailing list > > to Send a Message to the list, use the email address > [email protected] > > to UNSUBSCRIBE or Change your List Settings use the web page > http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org > > for more Biomass Cooking Stoves, News and Information see our web site: > http://stoves.bioenergylists.org/ > > _______________________________________________ > Stoves mailing list > > to Send a Message to the list, use the email address > [email protected] > > to UNSUBSCRIBE or Change your List Settings use the web page > http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org > > for more Biomass Cooking Stoves, News and Information see our web site: > http://stoves.bioenergylists.org/ >
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