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Post by ajaykannanilango on Jan 4, 2013 0:23:51 GMT -8
Hi , is anyone here working with the rocket stove with an aim to achieve pyrolysis ??
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Post by satamax on Jan 4, 2013 8:44:04 GMT -8
Well, i don't know exactly if rocket do it, but i would think so, as my latest heat riser is white inside. And bright orange when running. Which is big with a fireclay inside tube. IIRC, someone at permies, mentioned hanging a piece of rebar down the heat riser to achieve pyrolysis. Well, i re read the proper definition of pyrolysis, and pretty sure rockets don't do it. en.wikipedia.org/wiki/Pyrolysis |
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Post by matthewwalker on Jan 4, 2013 15:31:44 GMT -8
Actually I think all wood fires achieve pyrolysis, don't they? I'm sure pyrolysis is happening in a wood burning rocket.
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Post by satamax on Jan 4, 2013 22:14:04 GMT -8
Yep Matthew, true. But in this case, it happens within the wood itself. After air gets in between the sticks, there's fire. "Pyrolysis is a thermochemical decomposition of organic material at elevated temperatures without the participation of oxygen." Well, i thought there was plenty of oxygen going through a rocket  So, it achieves fire, not "just pyrolysis" |
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Post by Donkey on Jan 4, 2013 22:19:33 GMT -8
Burning wood always involves driving off wood-gas in one way or another, which is (technically) pyrolysis. Rocket stoves are not considered to be "pyrolysis stoves", they burn their wood-gas immediately. I have thought about the possibility of making a 2-stage pyrolising rocket stove.. It would be rather complex and tend to cause more problems than it solves.. so, my question to ajaykannanilango is: what problem are you trying to solve? Why would you WANT a pyrolising rocket stove? Welcome to the boards..  |
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Post by ajaykannanilango on Jan 4, 2013 22:47:09 GMT -8
Donkey:Its my pleasure to join this forum . I am trying out the possibility to convert biomass into biochar using a rocket stove. So I need to know has anyone here done a similar experiment. My main concern as pointed out by fellow members is how will I regulate air( oxygen ) in order to achieve pyrolysis ??
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Post by ajaykannanilango on Jan 5, 2013 19:35:36 GMT -8
I am pretty new to research and my questions may be very basic so please bear with me !! How do we measure the temperature achieved in a rocket stove  |
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Post by Donkey on Jan 6, 2013 20:51:50 GMT -8
I am trying out the possibility to convert biomass into biochar using a rocket stove. So I need to know has anyone here done a similar experiment. Rocket stoves are the wrong kind of stove for doing this.. Err.... Rocket stoves are wrong for doing this INSIDE THE STOVE ITSELF... Phillipjacks has been experimenting with something along the lines.. Look here for his thread.It's an interesting idea, but there are quite a lot of things that need solving with it yet. If you just want to make charcoal (Biochar) you might want something like a TLUD.. (Top Loading Updraft stove.) |
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Post by ajaykannanilango on Jan 8, 2013 0:02:21 GMT -8
Thanks will look into it ..............
anyways how will measure the temperature achieved by these stoves ??
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Post by lockupnomad on Feb 1, 2013 9:08:25 GMT -8
Have you solved this yet? I am new to the boards, I have successfully made a small bean-can gassifier, I have just finished a #10 sized rocket stove. I've been reading and watching alot of youtube on modified rocket stoves that can be used to create biochar.
The main points to creating a rocket stove to make biochar seem, to my simple understanding, to focus around these few mods to a standard rocket stove:
1. Obviously the insulating material is exchanged for bio-mass. The biomass materials of choice seem to be sawdust, wood chips, etc. with the key point being they are thoroughly dry prior to placing them in the unit.
2. The separation between the burn tube/heat riser needs to be sealed at the top. This is because unlike a gassifier stove where there are holes at the top of the inner chamber, a bio-char rocket stove needs the holes to be along the bottom of the heat riser and on the floor of the burn chamber.
3. Forced air via some sort of fan-tube is needed and directed up from the bottom of the unit into the base of the burn chamber. This creates the pulling or gassifier effect both to superheat the fuel and to initiate pyrolysis by creating a vacuum (sort of) for the wood gasses being released by the oxygen deprived bio-mass. Since the top of the unit is sealed, the gasses can only escape into the burn chamber, via the holes in the bottom of the heat riser, mix with the fuel, heat and oxygen being forced in through the burn chamber and thus burn hotter, cleaner and in the process create the bio-char.
At least that sounds like what I've been reading/seeing on the modified rocket stove/bio-char rocket stove. I have not built one of these yet, but am collecting materials to do so in the near future.
I would like to use a 30lb propane tank as the base unit. In my fantasy world, I will use a 20lb propane tank as a detachable heat exchanger-cooking surface/ repository for copper coils to pipe and heat water through it.
Still up in the air about detachability, portability, practicality or even purpose. I believe I'd like to use the unit in my travel trailer if it worked.
If you have solved your own questions/ideas, please share with us your solution and design ideas. Be safe.
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Post by mechartnik on Feb 1, 2013 9:46:36 GMT -8
TLUD's are probably the most sensible way of making biochar, plenty of video out there...
One could use a rocket to heat a retort: think rocket stove (for cooking with pot skirt) heating
the pot (retort with biomass inside). Again, there are details out there...
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Post by Donkey on Feb 4, 2013 7:58:17 GMT -8
Again, rocket stoves are not really suitable for this job!
Also, removing the insulation from the stove in order to pyrolyze wood against the heat riser is MISSING THE POINT of rocket stoves!
Honestly, the TLUD (and others) are FAR better suited to this job!
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Post by kevinofmorris on Feb 4, 2013 12:33:22 GMT -8
Some of you may have seen this video before about the Hornito. www.youtube.com/watch?v=hZD6hrVhZGc I found the link over at Permies.com in a thread that started with a rant about the pollution caused by traditional biochar production. It seems as if it fits this discussion. Anyway, the operation uses rocket stoves to heat the sealed retorts, then they feed the wood gas back into the rocket stoves. It's an interesting use of the technology. |
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Post by ajaykannanilango on Feb 26, 2013 6:47:29 GMT -8
thank you guys for the information ...... I am currently working on lab scale pyrolysis reactor ...... looking at the results will look forward to replicate it using a rocket stove or any other suitable stove.
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Post by rythzz on Aug 5, 2014 8:55:08 GMT -8
I've done primary test on something that may interest you. It's a hybrid between rocket and pyrolysis, I use rocket to start a pyrolysis stove who auto-feed himself and let's great biochar. If you want I can show you the final result.
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