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:[email protected]] On Behalf Of David Coote Sent: Sunday, February 02, 2014 11:50 AM To: [email protected] 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, [email protected] wrote: > Send Gasification mailing list submissions to > [email protected] > > To subscribe or unsubscribe via the World Wide Web, visit > > http://lists.bioenergylists.org/mailman/listinfo/gasification_lists.bi > oenergylists.org > > or, via email, send a message with subject or body 'help' to > [email protected] > > You can reach the person managing the list at > [email protected] > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of Gasification digest..." > > > Today's Topics: > > 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<[email protected]> > To: Discussion of biomass pyrolysis and gasification > <[email protected]> > Cc: David Coote<[email protected]> > Subject: Re: [Gasification] Size of blower and tumbler required to dry > chip in a solar kiln > Message-ID:<[email protected]> > 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. > > > > ------------------------------ > > Subject: Digest Footer > > _______________________________________________ > Gasification mailing list > > to Send a Message to the list, use the email address > [email protected] > > to UNSUBSCRIBE or Change your List Settings use the web page > http://lists.bioenergylists.org/mailman/listinfo/gasification_lists.bi > oenergylists.org > > for more Gasifiers, News and Information see our web site: > http://gasifiers.bioenergylists.org/ > > > > ------------------------------ > > End of Gasification Digest, Vol 42, Issue 2 > ******************************************* > > _______________________________________________ Gasification mailing list to Send a Message to the list, use the email address [email protected] to UNSUBSCRIBE or Change your List Settings use the web page http://lists.bioenergylists.org/mailman/listinfo/gasification_lists.bioenerg ylists.org for more Gasifiers, News and Information see our web site: http://gasifiers.bioenergylists.org/ _______________________________________________ Gasification mailing list to Send a Message to the list, use the email address [email protected] to UNSUBSCRIBE or Change your List Settings use the web page http://lists.bioenergylists.org/mailman/listinfo/gasification_lists.bioenergylists.org for more Gasifiers, News and Information see our web site: http://gasifiers.bioenergylists.org/
