[Gasification] Gasification Digest, Vol 13, Issue 1

Thu Sep 1 23:55:42 CDT 2011

Thanks! I'd love to see a sketch. 5" seems pretty minimal; the riser inside
the cyclone would probably be limited to 2-or-2-1/2", and the tangential
entry about the same, but lots of light-phase, vacuum conveyance systems are
built with 2-1/2" tubing and spiral PVC hose. Exhaust tube is fun to weld
with either a little MIG or oxy-acetylene system. Good choice.

For some reason or other (it seems intentional) all of the high-efficiency
cyclones I have worked with have been constructed with long, narrow-angled
conical bottoms. The powder must be exposed to increasing centrifugal forces
as it reaches the discharge zone, to keep it out of the exit airstream, I
reason. But I'm certain that there's a point of diminishing return and KISS
always applies!

Mark

From: gasification-bounces at lists.bioenergylists.org
[mailto:gasification-bounces at lists.bioenergylists.org] On Behalf Of awesales
Sent: Thursday, September 01, 2011 5:55 PM
To: gasification at lists.bioenergylists.org
Subject: Re: [Gasification] Gasification Digest, Vol 13, Issue 1

Hi Mark

I built a cyclone for my gasifier it is made from a 5" truck exhaust pipe.
It's heavy enough to disapate heat and welds very well. I entered with a 2"
pipe and axhausted with a 2" pipe. The conventional wisdom is 2:1 ratio
inlet pipe to dia.of the cyl.I have tried this unit a couple of times and it
works well. I understand the "cone" bottom is not a great advantage. I have
a simple drawing of it if you want one.

tbone188 at gmail.com

On Thu, Sep 1, 2011 at 12:00 PM,
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Today's Topics:

  1. Re: Charcoal Reduction Mill (Henri Naths)

----------------------------------------------------------------------

Message: 1
Date: Thu, 1 Sep 2011 10:37:49 -0600
From: Henri Naths <c_hnaths at telusplanet.net>
To: "mark at ludlow.com" <mark at ludlow.com>,        Discussion of biomass
       pyrolysis and gasification
<gasification at lists.bioenergylists.org>
Subject: Re: [Gasification] Charcoal Reduction Mill
Message-ID: <03DD01BD-834D-4259-A44E-5A037F4DFA3C at telusplanet.net>
Content-Type: text/plain; charset="utf-8"

Thanks Mark
H

Sent from my iPhone

On Aug 27, 2011, at 2:12 PM, "Mark E. Ludlow" <mark at ludlow.com> wrote:

> I?ll see what I can dig up. I did a project without a final baghouse and
was amazed at how much the 1% loss of efficiency really amounted to! (it?s
all super-fines). But getting the first 98-or-99% collected takes a huge
load off the baghouse. A critical part of the cyclone is a long-ish
downcomer that allow the material to accumulate and discharge with out
disrupting the vortex dynamics. Learned by experience! Also, stacked
Posiflate valves in lieu of a rotary airlock.
>
>
>
> Best, Mark
>
>
>
> From: Henri Naths [mailto:c_hnaths at telusplanet.net]
> Sent: Saturday, August 27, 2011 7:05 AM
> To: mark at ludlow.com; Discussion of biomass pyrolysis and gasification
> Subject: Re: [Gasification] Charcoal Reduction Mill
>
>
>
> Then, a tall skinny, cyclone
>
>
> Hi mark
>
> I was wondering if you or some one on the list has the math for the
efficiency ratios for cyclones ie. Tall skinny vrs short fat cfm, volume?
Particulates?
>
> Thanks
>
> Henri
> Sent from my iPhone
>
>
> On Aug 25, 2011, at 10:14 PM, "Mark E. Ludlow" <mark at ludlow.com> wrote:
>
> Then, a tall skinny, cyclone
>
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