[Gasification] blower suggestions?

Tue Aug 7 16:00:29 EDT 2007

Lets assume that the fan is driven by an induction motor without brushes.
One could put in an explosion-proof motor (Class 1 Div.II) from a junk yard
or simply operate with adequate ventilation. The volumes of gas contained in
the system are small in any case and crimped stovepipe would simply pop its
seams. For sawdust collection the issue is ignition of the collected
sawdust. The "explosion" itself is easily handled with improvised rupture
discs (several layers of aluminum foil or graphite if you want to go
up-town). Bonding of ductwork and providing frequent drains to ground is
always a good idea, also.

Mark

-----Original Message-----
From: gasification-bounces at listserv.repp.org
[mailto:gasification-bounces at listserv.repp.org] On Behalf Of Louis Peltier
Sent: Tuesday, August 07, 2007 10:44 AM
To: Discussion of biomass pyrolysis and gasification
Subject: Re: [Gasification] blower suggestions?

i haven't followed this thread but if there is a flameable gas going
through the motor area , it's only a matter of time when the right
explosive mixture will be ignited by the brushes on the armature.
Louis Pelletier
in cloudy BC

> that is a good pointer.  thank you.  this is actually a rather good
> solution.  it is likely reasonable vacuum as it is needs to entrain
> sawdust in the pipes.  and likely well sealed or sawdust would leak
> and/or ignite in the motor.  yes, the impeller needs to be metal.  or
> just use it on the cold gas side, which is what i do currently with
> the shop vacs.
>
> thank you john.
>
> j
>
>
>
> On 8/7/07, John T. Frimenko <jtf at dejazzd.com> wrote:
>> Jim,
>> If you have a local Harbor Freight store, look at their dust collectors:
>> http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=94029
>>
>> Drive motor has two brushes; speed should be controllable, but is a
>> potential ignition source. Don't know blower wheel material, assuming
>> sheet metal(?). The product manual is available, from the web site.
>>
>> Might be worth  consideration.
>>
>> John in Pa.
>>
>>
>>
>> jim mason wrote:
>> > thank you for that.  for those who are not familiar with regenerative
>> > blowers (as i was not), here is a good intro:
>> > http://www.pneumaticsonline.com/Articles/fpzregenblowers.html
>> >
>> > j
>> >
>> >
>> > On 8/7/07, Mark Ludlow <mark at ludlow.com> wrote:
>> >
>> >> Jim,
>> >>
>> >> I've bought a number of regenerative blowers off Ebay (One super-deal 
>> >> and a
>> >> bunch of OK deals). They're a little noisy but pressure or suction 
>> >> head is
>> >> no issue and they exist in a number of junk devices. Second choice:
>> >> radial-vane centrifugal blowers. Find one that was used in a small 
>> >> materials
>> >> transport system (home-shop sawdust collection) or a small bag house 
>> >> where
>> >> 12-18" of suction is not uncommon. How much air do you need? I'd be 
>> >> happy to
>> >> size one for you. If these options don't, a motor from an old Kirby 
>> >> vacuum
>> >> cleaner does the job and looks sharp too!
>> >>
>> >> Mark
>> >>
>> >> -----Original Message-----
>> >> From: gasification-bounces at listserv.repp.org
>> >> [mailto:gasification-bounces at listserv.repp.org] On Behalf Of jim mason
>> >> Sent: Tuesday, August 07, 2007 12:55 AM
>> >> To: Discussion of biomass pyrolysis and gasification
>> >> Subject: [Gasification] blower suggestions?
>> >>
>> >> i need to stop using shop vacs to pull my vacuum for gasifier tests.
>> >> i'm curious what people have found useful for gasifier testing, and
>> >> also long running when a blower is needed to feed an open flame
>> >> situation.
>> >>
>> >> i need to pull at least 10" of water vacuum.  a squirrel cage will not

>> >> do
>> >> it.
>> >>
>> >> as usual, the blower needs to be well sealed, and the cooling air for
>> >> the motor needs to not come from the blown gas.
>> >>
>> >> what are the good value solutions identified to date?
>> >>
>> >> jim
>> >>
>> >>
>> >>
>> >>
>> >>
----------------------------------------------------------------------------
>> >> ----
>> >> jim mason
>> >> website: www.whatiamupto.com
>> >> current project: mechabolic (http://www.mechabolic.org)
>> >> announce list: 
>> >> http://lists.spaceship.com/listinfo.cgi/icp-spaceship.com
>> >>
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>>
>>
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>
>
> -- 
>
----------------------------------------------------------------------------
----
> jim mason
> website: www.whatiamupto.com
> current project: mechabolic (http://www.mechabolic.org)
> announce list: http://lists.spaceship.com/listinfo.cgi/icp-spaceship.com
>
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