[Gasification] Gasification Digest, Vol 42, Issue 2

Mark Ludlow mark at ludlow.com
Sun Feb 2 14:16:58 CST 2014


Hi David,

Most tumblers have "shelves" upon which the product is carried. You must
estimate the total mass being lifted at any one time and know the tumbler
diameter and RPM. We take these numbers and calculate the real work being
done, then add some headspace for drive losses and occasional overfeeding.
You are looking for the torque required as torque X RPM=hp (Watt) if you use
consistent units.

Power (kW) required by a motor is rated a FLA (full load amps). So there's
no huge disadvantage in oversizing the motor. If your application requires
less power, you will only pay for the extra magnetizing current, which is
not much.

Best, Mark

-----Original Message-----
From: Gasification [mailto:gasification-bounces at lists.bioenergylists.org] On
Behalf Of David Coote
Sent: Sunday, February 02, 2014 11:50 AM
To: gasification at lists.bioenergylists.org
Subject: Re: [Gasification] Gasification Digest, Vol 42, Issue 2

My question is aimed at using a solar kiln to dry chip for use in a biochar
system or gasifier/combustion bioenergy system, Doug. This would use
material from waste woody biomass streams in regional Australia. 
Likely to be a mix of eucalypt, conifers, acacias and exotics. I don't have
a feel for the size of electric drive required for a tumbler handling
perhaps several cubic metres hence my question. And I suspect a blower would
also be necessary but again I don't have a feel for what size of fan would
be suitable for this scale. Hence my query.

If you're interested in drying timber in a solar kiln there's a reasonable
amount of literature I can point you at but that's perhaps a bit off-topic
for discussion on this list.

Cheers

David

On 3/02/2014 6:00 AM, gasification-request at lists.bioenergylists.org wrote:
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>     1. Re: Size of blower and tumbler required to dry chip in a
>        solar kiln (Doug)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sun, 2 Feb 2014 17:16:18 +1300
> From: Doug<Doug.Williams at orcon.net.nz>
> To: Discussion of biomass pyrolysis and gasification
> 	<gasification at lists.bioenergylists.org>
> Cc: David Coote<dccoote at mira.net>
> Subject: Re: [Gasification] Size of blower and tumbler required to dry
> 	chip in a solar kiln
> Message-ID:<20140202171618.a726898f0dc78fe0885f6547 at orcon.net.nz>
> Content-Type: text/plain; charset=US-ASCII
>
> Hi
> David,
>
> Can you clarify a couple of points please?
>
>    
>> We're looking at several days around 40C in Melbourne this week after 
>> a record-breaking period two weeks ago with 4 consecutive days over 41C.
>> Solar kilns can get very hot with this much insolation although this 
>> can, of course, be managed with airflow. Managing timber drying in a 
>> solar kiln requires some care to reduce checking etc but drying chip 
>> would be less sensitive.
>>      
> Are you operating solar kilns in Melbourne or out in the Bush?
> When you say checking, are these splits in the timber, also known as
shakes?
> I'm guessing you are drying Eucalyptus timber?
> Are you using solar power at the kilns location?
>
> Once I get my head around the the kiln application, I might be able to
offer more comment.
>
> Doug Williams,
> Fluidyne Gasification.
>
>
>
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> End of Gasification Digest, Vol 42, Issue 2
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>    


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