[Gasification] Underwater gasification?

[Bruno M.]

Some thoughts & idea's :

" 40-50 amps "  doesn't say much; at which voltage, for how long?
If you want to pull 50 amps @ 12 volts for a 1 hour tour,
you'll need 600 Watt hour

Are you sure a 1 ton boat with a (very) wimpsy 0,6 kW electric motor,
will still go forwards with some wind ahead or going a bit upstream a 
river ?

Your talking about a 55000 btu/hr stove as heat source to power a 0,6kwh 
electric engine...
Thats 16 Kwh input for 0,6 kwh output...  Lots of waste


On that TEG site i don't see any TEGP15 model;
their "Model: UTEGEC" talks only about volts not amps or watts ( O.K., 
max 0,5 amps); and
their* 50 Watt Power Strip *(Thermoelectric Generator) *Model:* TEG50WPS
makes 50 watt max, so you need at least 12 of them;  +- 500 x 12 = 6000 $
without your heatsource.

Did you noticed thise devices are pretty in-efficient? 5-10% ( they 
say/claim, more realistic imho 1-3%)
http://en.wikipedia.org/wiki/Thermoelectric_generator

Why do you talk / need gasification, if you only seems to need heat?
Why not make woodgas and run it into an old Lister or a 
Lister-(chinese)-look-a-like ?
Or other converted diesel engines.

You end up with manytimes more energy at your screw, to really move that 
boat,
and, ... you still can capture some waste heat to charge a battery for 
your electric needs.

http://www.lister-petter.co.uk/products.php

http://www.youtube.com/results?search_query=lister&aq=f

http://www.youtube.com/results?search_query=lister+woodgas&aq=f

Grts
Bruno M.
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 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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