Talk:Pyrolysis Oil: Difference between revisions

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[http://www.alternatefuelsworld.com/pyrolysis-oil-terra-preta.htm Interesting article on the pros cons and problems and uses of pyrolysis oil.]
*The cons mentioned - are pros for Factor e Farm if we like biochar and external combustion engine fuel. - MJ
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''PyNe - The Biomass Pyrolysis Network - a global network of active researchers and developers of fast pyrolysis, has been established to discuss and exchange information on scientific and technological developments on pyrolysis and related technologies for the production of liquid fuels, electricity and chemicals.'' Interesting table on the various types of reactors and their relative value to difficulty of construction and quality of fuels. [http://www.pyne.co.uk/?_id=69 table at bottom]
==From Elliot Hallmark:==
here's a pyrolysis machine as i understand it:
1. you need a furnace, probably an old barrel for the outside of the combustion chamber lined with with a fireclay/sand/sawdust mixture inside.  it would have a lid with a moderate exaust port (maybe half the area of the lid is removed), which could be cast out of the same fireclay mixture.  also, theres an opening at the bottom for fuel and air.  you could run it on natural gas, since eventually you'd probably just pipe the wood gas back into it in a later version.
2. a chamber for the to be pyrolisized material to go into.  might be able to surround a cheap chamber with a thin protective coating.  thin so as not to impede heat transfer.  refractory mortar and sand maybe, the mortar is maybe $20 for all you'd need i think.  or you may need to use a large diameter pipe and make a bottom and top for it out of thick (5/8"-1/2" i guess) metal slabs.  it has to be somewhat thick because it will oxidize through quickly otherwise (would galvanization help or would you burn it out?)  at the top there is a hole for outlet, there is no inlet hole.
3.  a quencher.  apparently the quickness of the quenching is important, as the free radicals produced are rapidly combining to form tar and asphault as opposed to more useful things.  A common way of doing this is to spray a lot of cooled pyrolysis oil into the hot stream within a cyclone seperator (like your flour mill thing).  I don't know how practical that is.  perhaps cooling the walls of the cyclone seperator and the tubing up to it also with running water from your cold well would work.  this woukld need experimentation.
4. gas storage.  an oil drum filled with water, inverted and subersed in water.  A large version of how they collect gas in chemistry class.  bubble the gas in through the bottom and you've got a valve on the exposed surface to let the gas out at your leisure.  weights on top of the barral determine the psi of the storage.  eventually this gas might be just redirected back to the furnace, but at first its good to know how much gas you are getting, and also you could use it as cooking gas to displace your propane.
At first i say skip 3 and just let bubbling through the water in 4 be the quench.  then you could weigh the char and the gas and know how much oil you are producing.  most of the oil would probably be in a film at the bottom of the gas collection, but i dont know how the wetness would affect it (i think some fractions would polymerize with the water, or form a stable emulsion).  Theoretically, this would be the best quench as far as surface area of gas to thermal sink goes, so you'd get an estimate of how much oil very effective quenching would produce. then, when you have system data on flow rates and all that you can build a cyclone seperator and play with some better quenching ideas.
-elliot

Revision as of 05:03, 22 March 2009

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