[Gasification] tests to design a new cheap gasifier fan

[jim mason]

On Sat, Oct 2, 2010 at 4:58 PM, Alex English <english at kingston.net> wrote:
> Hi Jim,
> We did something similar to make a high temp blower. We grooved the hub and
> backing plate to set the vanes in. Then countersunk holes in the back of the
> grove to weld through and then grind smooth.
>

what i think you are describing is how we did the previous design and
will again locate vanes on this one if we do a welded version of the
rotor in the end.  there is tabs on the blades and holes in teh rotor
that postion it.  you weld from the back.

here's how the last one was done: http://gekgasifier.pbworks.com/Centrifugal-Fan


> What is your temperature target? What will the needle bearing tolerate?
>

don't really have a specific max, other than as much as possible.
200c is usually enough i find.   the limitation is usually the motor
mounting.  this new design offset the motor on a separate mount in the
back.  it doesn't mount directly to the back plate.  to the degree you
care about top temp, you can outboard further the motor, depending on
your shaft length.

we are using a needle bearing.  note sure of the top temp.  there are
also easy to find high temp graphite bearings in common sizes so if a
very high temp operation is needed an appropriate bearing could be
used.

j




> Thanks for sharing it.
>
> Alex
>
>
>
>
>
>
> On 10/2/2010 5:58 PM, jim mason wrote:
>>
>> we've been doing some work lately to design a new fan/blower that will
>> produce the needed vac and heat tolerance for gasifier operation.  as
>> we all know, there is not an inexpensive source for such a thing from
>> other industries and applications.  thus we had to build one for the
>> early gek kits.
>>
>> the original gek fan proved to not be strong enough once we finally
>> characterized the vac numbers that produce the flow/heat rates that
>> correspond to full tar conversion.  the ejector/venturi solution we're
>> using currently produces plenty of vac and is very flexible, but
>> requires compressed air.  this is not good for many off grid
>> situations.  thus we still need a good fan/blower source.  and one
>> that works on 12vdc, not an ac source.
>>
>> here's the info an pictures of our recent tests to produce this.  we
>> are working towards a much simplified solution that also gets rid of
>> the welding to make it.  this is based on the common car/truck fasco
>> type fan motor.
>>
>> http://gekgasifier.com/forums/showthread.php?t=455
>>
>> jim
>>
>>
>>
>> --
>>
>> ------------------------------------------------------------------------------
>> Jim Mason
>> Website: http://www.whatiamupto.com
>> Current Projects:
>>    - Gasifier Experimenters Kit (the GEK): http://www.gekgasifier.com
>>    - Escape from Berkeley alt fuels vehicle race:
>> www.escapefromberkeley.com
>>    - ALL Power Labs on Twitter: http://twitter.com/allpowerlabs
>>    - Shipyard Announce list:
>> http://lists.spaceship.com/listinfo.cgi/icp-spaceship.com
>>
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>
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-- 
------------------------------------------------------------------------------
Jim Mason
Website: http://www.whatiamupto.com
Current Projects:
   - Gasifier Experimenters Kit (the GEK): http://www.gekgasifier.com
   - Escape from Berkeley alt fuels vehicle race: www.escapefromberkeley.com
   - ALL Power Labs on Twitter: http://twitter.com/allpowerlabs
   - Shipyard Announce list:
http://lists.spaceship.com/listinfo.cgi/icp-spaceship.com