v2. Rocket stove + gasifier

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Well, just completed version 2.  Haven't been able to test it yet.  I hope to do that tonight.  Changes from version 1:1.  Grill is hinged2.  Grill is not painted3.  Feed tube at 45 degree angle (so I don't have to keep pushing in sticks4.  Contains middle core for gasifier5.  LegsLegs and feed tray fit inside the main stack for storage.1st pic is a non sketchup drawing of my design.....  Basically, there is a hole in the bottom that allows air in.  As air touches the hot bottom of the stack the air rises and is forced to exit near the top.  The hot air will hopefully cause a secondary burn on the gases.  I will test later tonight hopefully.Welds aren't all that pretty, but they are functional. Attached ImagesThe Lord has declared, "This is my work and my glory--to bring to pass the immortality and eternal life of man"  Moses 1:39Link: My name is John, and I am a member of The Church of Jesus Christ of Latter-Day Saints.-- ColdCreekWorks.com --
Reply:jdh I'm not sure that both types of device's main principles' are being upheld on this pot burner?The rocket is based on a downdraft convention BTU and then secondary draft air to solid heat exchanger, There is no real open top component to the rocket stove phenomenon. A wood gasifier is based on a core principle of one or another 'hearth' designs or controlled burn ratio oxidation reduction chambers; to maximize hydrogen and CO gas production for later burning in other devices.  I see you have a angle fed fire pot with some convention (chimney draft) potential to induce a secondary burn (?) but neither are necessary described by the names you've posted?I'd call it a "well ventilated fire pot" but not sure how the other two ideas or existing devices play into this design? The heat in the open stack' will actually cause a low pressure area that will be expressed as a differential pressure between the bottom hole and the upper area, but I'd expect the rising secondary air jets will be largely dissipated into the atmosphere above the open top.  They may show a flame path but I don't see how that will be more than deflection when the flame of the pot is rising above the opening?  (If this added air is a real goal?) I'd put the outlet/mix holes much lower & another liner to allow an up-and-down travel of the secondary air to allow much higher preheating THEN introduce the secondary air lower, still above the burn area,  and add a bit more stack. Then the re-burning of the preheated air will have some additional contribution to gas burn.But the entire premise of the 'rocket stove' is to burn at super high (air) velocities to create a huge oxygen surplus, (high speed flow = 'rocket') and that is why these stoves are supposed to get by without a catalytic converter, secondary burn areas or other features seen on thermal mass burner type stoves.I guess I'm not getting the benefits of these ideas ? Why does the rocket type stove need added air ? and what "unburned gases" are going out the top that are short of O2 molecules to oxidize with?Cheers,Kevin Morin
Reply:I'm interested to see how it burns and if it works as you hope. I have a gassifier camp stove that has a couple batteries to run the fan... the thing will squeeze heat out of stuff that normally just smolders like pine needles. After I got it I tried burning anything and everything... It does great on chunks of tire... not of lick of black smoke... although I wouldn't recommend cooking on it.
Reply:I tested it out tonight.  When you have it burning high and hot there is a secondary burn going on, but never get to a blue flame as you would a gasifier.  If you wish to boil water you can stoke it up and get the secondary burn.  When letting the flame die back some for "grilling" you wont even come close to a secondary burn.I think a true "rocket stove", as stated previously, would require a longer stack, but I am trying to keep the size of this down for portability and storage.  It is for me long term food storage prep.  In case I need to cook something, or boil some water (with very little fuel), then I will have this option.For what it is, it works well I think.  I will have a video up in a couple of hours probably.The Lord has declared, "This is my work and my glory--to bring to pass the immortality and eternal life of man"  Moses 1:39Link: My name is John, and I am a member of The Church of Jesus Christ of Latter-Day Saints.-- ColdCreekWorks.com --
Reply:Did some cooking on it tonight and roasted some marshmallows.  Didn't really fire it up to boil water or anything like that.  Worked out well I thought.Go to 31 minutes 31 seconds to see it going.[ame]www.youtube.com/watch?v=hiId_7vuhDM&t=31m31s[/ame]The Lord has declared, "This is my work and my glory--to bring to pass the immortality and eternal life of man"  Moses 1:39Link: My name is John, and I am a member of The Church of Jesus Christ of Latter-Day Saints.-- ColdCreekWorks.com --
Reply:[QUOTE=forhire;2570101It does great on chunks of tire... not of lick of black smoke... although I wouldn't recommend cooking on it. [/QUOTE]If you cook a steak on that you could say it is a bit rubbery.