Dear Bjarne It is now clear - there are two sections of the stove - a gas making unit and a mixing/burning unit.
I am still missing one critical piece of information: where does the secondary air enter the upper unit? It seems to have all the basic parts in place. There is a feature, not in the positive sense, that man gasifiers have which is to separate the gas burning from the fuel bed. There is no essential reason for doing this. It actually introduces two new problems that should not be there which are: separating the radiated heat from the underside of the flame from fuel bed and the addition of the problems related to the flame going out and not re-lighting. Thus, where you add the secondary air is critical. It can prevent both problems. It would be unfortunate if you were spending money and effort to create a problem that should not be there. I did not realise without the photos that you had a removable upper section. The photos helped a lot in clearing that up. If the secondary air were pushed into the gas at the top of the fuel containing section and the plate with the triangular holes were not present, what happens? If there was the same top round disk placed at the top if the fuel container - or better, at the bottom of the upper unit so it is removable - it would push the secondary air into the gas near enough to the fuel to help keep it hot. The 'disk' could have any of a number of complex shapes to promote mixing, but the point is that the secondary air should not be added near the top because it means the flames will be running against the pot spoiling the CO and PM burn. That is why I am asking about where (am perhaps how) the secondary air is introduced. The stove looks quite strong. Regards Crispin Dear Crispin Here is some pictures of the Jiko Bomba casification cookstove. The first shows the two part of the stove with pellet as fuel in the firebox before fire is lit. Second show the stove burning. The third the same, in the end of the gasification. The forth shows the charcoal stage where the pellets remains as glowing carbon. A pot can be put on top of the bottom part of the stove, there are three supports for that. Yours Bjarne Laustsen _______________________________________________ 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://www.bioenergylists.org/
