Sam - not sure where this has gone. Pursuit Dynamics seem to be on a new path. Maybe Dr Burns is still working on it. http://www.gizmag.com/go/1734/
Message: 1 > Date: Wed, 18 May 2011 21:03:36 +0100 > From: [email protected] > To: [email protected] > Subject: [Gasification] Underwater gasification? > Message-ID: > <[email protected]> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed; DelSp=Yes > > > Hi all > > I wish to move a 22ft 1 tonne boat using wood power. > > I have already considered gasification + combustion, gasification + > stirling engines, even steam power! > > My latest thought experiment is gasification + thermo-electric generators. > > looking at the products of tegpower.com it seems like this may be > viable, if somewhat expensive (?4k) > > To move the boat at around three knots will take an estimated 40 -50 > amps http://www.floveroutboard.co.uk/outboards.html > > Which will require approximately 50 of the TEGP15 thermo electric > panels http://www.tegpower.com/products.html. I then need to keep one > side of the panel at 20C (or lower) and the other at 260C. (but no > higher than 325C) > > Initially I considered doing this with an active water pump driven > cooling system, which would be fine, however if the pump/wiring fails > or gets blocked the considerable investment in TEG panels melts before > your eyes. > > So I figured given all the water around the boat it might be better to > run a passive cooling system, and actively pump the air for the > gasifier. That way if something breaks it just cools down and stops > working. > > Which leads me to the challenge of gasification underwater.. > > I have taken as a benchmark the mega fireplace gasifer > http://www.woodgas-stove.com/how_to_use_woodgas_stoves.php which puts > out 55,000 btu/hr which on paper is enough power. > > So I am thinking about taking take a 14inch x 6ft diameter steel pipe > with a sealed end and sticking a woodgas fireplace in it. Then feeding > a air supply pipe down to the bottom, and using a fan to force the air > in. > > The TEG units will be attached to the inside of the pipe with some > kind of heat conducting cement. The water temperature outside the pipe > (typically 5C - 15C) will provide the passive cooling, and the heat > rising up from the stove will heat the inner panel (maybe!) > > I did a bad diagram here: http://i.imgur.com/SYpu2.jpg > > I realise the engineering challenges of this are not trivial.. > > * Are forced updraft gasifiers harder to make/ less efficient on this > scale? > > * What would be a good guesstimate for the temperature at the bottom > TEG? The top TEG? Above 325C? > > The next step is to buy a the pipe and woodgas fireplace and do some > real world tests. Is it worth me taking that next step? Do you see > insurmountable problems? > > Thanks > > Sam > > > >
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