[Gasification] 1 TPH down draft gasifier - air blower

Greg Manning a31ford at gmail.com
Sat Aug 27 19:07:09 CDT 2011


Greetings,

I'm not sure of the question, as both A & B deal with "blown" air, so this
in itself is a bit confusing, but I'll try to shed some infomation as to
"blown and suction" versions of gasifiers.

The BIG thing to note here is "feet of head" suction or pressure, within the
actual hearth load, that is to say the overall In/wc differential from
feedstock side to gas output side of the hearth.

The greater the differential (bunker side to raw gas side) the more "Push"
or "Pull" (Blown or Suction, respectively) the gasifiers air system will
have to deal with. With that said, the feedstock partical size will have the
greatest effect on this differential pressure or suction, and therefore,
will determine the needed pressure (or suction) of inlet air, vs. outlet
gas.

The Second most important relationship that will cause or determine the
required airflow velocity and volume, will be the size of the hearth or "gas
evolution bed" (surface area of bed opening). this opening (and the grate or
grid opening size)  will somewhat coreaspond or directly be a function of
bed (hearth) size, as well as feedstock size.

I guess what I'm trying to say in simple terms is, the smaller the
feedstock, and the smaller the hearth size, the larger or greater the volume
and or flow rate of inlet air.

In a nutshell, it's easy to make gas, it's hard to make goodgas (a pun on
woodgas ;-)

So really, both A an B are correct, in your question below, they would be
directly proportional to both feedstock size, and hearth size for the flow
and volume rates indicated.

Greg Manning,
Canadian Gasifier Ltd.

On Fri, Aug 26, 2011 at 2:31 PM, A.Saravanakumar
<sara_mnes at rediffmail.com>wrote:

> Dear All,
>
> In biomass gasification
>
> a. 1TPH down draft gasifier 1500kg /hr air flow is needed for 1ton
> of wood is gasified. So gas produced for 2500 kg /hr. Air blower
> pressure is 300mm water column. Air blower CFM is 1000.
>
> Practically, for some people using
>
> b. The same 1TPH down draft gasifier using air blower pressure is
> 600 to 1000 mm water column. Air blower CFM is 2000.
>
> Whether a / b is correct? Or not
>
> Explain.
>
> A. Saravanakumar
>
> On Sat, 27 Aug 2011 00:32:22 +0530 wrote
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> 1. Charcoal Reduction Mill (Jeff Davis)
>
> 2. Re: Charcoal Reduction Mill (Pannirselvam P.V)
>
> 3. Re: Charcoal Reduction Mill (Mark E. Ludlow)
>
>
>
>
>
> ----------------------------------------------------------------------
>
>
>
> Message: 1
>
> Date: Thu, 25 Aug 2011 23:55:53 -0400
>
> From: Jeff Davis **
>
> To: Gasification List **
>
> Subject: [Gasification] Charcoal Reduction Mill
>
> Message-ID: <1314330953.1414.92.camel at jeff-laptop>
>
> Content-Type: text/plain; charset="UTF-8"
>
>
>
> Dear List,
>
>
>
>
>
> What would be the best style of mill to reduce weed and soft wood
>
> charcoal (mostly weed). This would be for charcoal Fireball production.
>
> All advice will be appreciated.
>
>
>
> Reduction might be 2 mm to dust. Enough dust to fill in the larger 2 mm
>
> particles. Might be possible to have some particles larger than 2 mm.
>
>
>
> Production is difficult for me to pin down but lets say 400 lbs/hr (180
>
> kg/hr). More is better but less would be OK for now. The more I think
>
> about it a lot less would work for now.
>
>
>
> Would a farm hammer mill with cyclone bagger be a formula for a dust
>
> storm?
>
>
>
>
>
>
>
> Clueless,
>
>
>
>
>
> Jeff
>
>
>
>
>
>
>
>
>
> ------------------------------
>
>
>
> Message: 2
>
> Date: Fri, 26 Aug 2011 01:10:33 -0300
>
> From: "Pannirselvam P.V" **
>
> To: Discussion of biomass pyrolysis and gasification
>
> **
>
> Subject: Re: [Gasification] Charcoal Reduction Mill
>
> Message-ID:
>
> **
>
> Content-Type: text/plain; charset="windows-1252"
>
>
>
> Helo Jeff
>
>
>
> Ball mill can solve the problems
>
>
>
> On Fri, Aug 26, 2011 at 12:55 AM, Jeff Davis **wrote:
>
>
>
> > Dear List,
>
> >
>
> >
>
> > What would be the best style of mill to reduce weed and soft wood
>
> > charcoal (mostly weed). This would be for charcoal Fireball production.
>
> > All advice will be appreciated.
>
> >
>
> > Reduction might be 2 mm to dust. Enough dust to fill in the larger 2 mm
>
> > particles. Might be possible to have some particles larger than 2 mm.
>
> >
>
> > Production is difficult for me to pin down but lets say 400 lbs/hr (180
>
> > kg/hr). More is better but less would be OK for now. The more I think
>
> > about it a lot less would work for now.
>
> >
>
> > Would a farm hammer mill with cyclone bagger be a formula for a dust
>
> > storm?
>
> >
>
> >
>
> >
>
> > Clueless,
>
> >
>
> >
>
> > Jeff
>
> >
>
> >
>
> > _______________________________________________
>
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>
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>
>
> --
>
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>
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>
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> -------------- next part --------------
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> ------------------------------
>
>
>
> Message: 3
>
> Date: Thu, 25 Aug 2011 21:14:31 -0700
>
> From: "Mark E. Ludlow" **
>
> To: "'Discussion of biomass pyrolysis and gasification'"
>
> **
>
> Subject: Re: [Gasification] Charcoal Reduction Mill
>
> Message-ID: <0ce601cc63a6$a8411420$f8c33c60$@ludlow.com>
>
> Content-Type: text/plain;charset="us-ascii"
>
>
>
> Hi Jeff,
>
>
>
> A small hammer mill would be fine, but you need to run it under negative
>
> pressure to keep from making a mess. Start at the back end with a small
>
> blower good for 12" suction. Then a fake baghouse (three old Shopvacs in
>
> parallel would be fine.) Then, a tall skinny, cyclone (high-efficiency)
> with
>
> a downleg terminated with a couple butterfly valves operating 90deg out of
>
> phase as an airlock. This dumps into your collection bag/drum.
>
>
>
> Of course, any kind of feed auger makes things more fun. Get a fine screen
>
> for the mill and don't push things to prevent a conflagration which would
>
> ruin anyone's day. The cyclone is about 99% efficient by weight, so it
> takes
>
> the load off your "baghouse".
>
>
>
> An even simpler solution is a homebrew ball or rod mill.
>
>
>
> Mark
>
>
>
> -----Original Message-----
>
> From: gasification-bounces at lists.bioenergylists.org
>
> [mailto:gasification-bounces at lists.bioenergylists.org] On Behalf Of Jeff
>
> Davis
>
> Sent: Thursday, August 25, 2011 8:56 PM
>
> To: Gasification List
>
> Subject: [Gasification] Charcoal Reduction Mill
>
>
>
> Dear List,
>
>
>
>
>
> What would be the best style of mill to reduce weed and soft wood charcoal
>
> (mostly weed). This would be for charcoal Fireball production.
>
> All advice will be appreciated.
>
>
>
> Reduction might be 2 mm to dust. Enough dust to fill in the larger 2 mm
>
> particles. Might be possible to have some particles larger than 2 mm.
>
>
>
> Production is difficult for me to pin down but lets say 400 lbs/hr (180
>
> kg/hr). More is better but less would be OK for now. The more I think about
>
> it a lot less would work for now.
>
>
>
> Would a farm hammer mill with cyclone bagger be a formula for a dust storm?
>
>
>
>
>
>
>
> Clueless,
>
>
>
>
>
> Jeff
>
>
>
>
>
> _______________________________________________
>
> Gasification mailing list
>
>
>
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>
> http://gasifiers.bioenergylists.org/
>
>
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>
>
>
>
>
>
> ------------------------------
>
>
>
> _______________________________________________
>
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>
> End of Gasification Digest, Vol 12, Issue 17
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-- 
 Regards,

Greg Manning,
Brandon, Manitoba, Canada
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