[Gasification] fluidized bed temps?

[jim mason]

thank you for that tom.  i will start with your pointers.  also, is
there any specific high value books dedicated to fluidized beds?  none
of the BEF books go into any design detail.  i realize i can find
things here and there in journals, but i'd imagine there must be some
larger publication that is a good starting point covering many designs
and installations.

also, what is the crc book?  i missed that discussion.

j



On 8/3/07, Tom Miles <tmiles at trmiles.com> wrote:
> Jim,
>
> There is actually quite a lot literature on fluid bed gasification that
> matches quite well with experience. You can run a bed in the 1200-1400F
> range with most fuels. You can control temperature quite well. This is a big
> benefit of fixed and circulating fluid bed gasifiers and combustors. You can
> have low peak temperatures throughout the reactor.
>
> Read Mike Lewis' paper on staged gasification
> http://gasifiers.bioenergylists.org/lewisstagegas
>
> Also read Energy Product of Idaho literature on FB gasification.
> http://www.energyproducts.com/EPITechnology.htm
>
> Other suppliers may have similar descriptive process data.
>
> And of course we discussed the CRC book last month I can see that we will
> have to put up a bibliography on gasification.
>
> Tom Miles
>
> -----Original Message-----
> From: gasification-bounces at listserv.repp.org
> [mailto:gasification-bounces at listserv.repp.org] On Behalf Of jim mason
> Sent: Friday, August 03, 2007 2:03 PM
> To: Discussion of biomass pyrolysis and gasification
> Subject: [Gasification] fluidized bed temps?
>
> i'm running a fluidized bed type gasifier and am curious about how my
> measured temps compare with the experience of others.
>
> i have a type K thermocouple on a long rod that i can move up and down
> in the tube.  in the "combustion" area i'm only getting temps in the
> 1100-1200C range tops.  often down to 900C.  as i pull the rod up, it
> quickly drops to 800-600C and stays there for quite a ways up the
> tube.  the drop gradiant is very fast after the combustion zone.
>
> my set up is far from rigorous at this point, but i'm surprised how
> low these readings are.  when i put the same thermocouple in a
> stratified downdraft combustion zone, i read at least 1300C, and often
> it goes off the scale at 1400C (the top for type K thermocouples).
>
> do fluidized beds typically run cooler as i'm seeing?  it makes sense
> that they would, given the non concentrated nature of the combustion,
> but i have not seen an expected temp profile for a fluidized bed.
>
> can anyone point me to and/or send a chart with typical temp profiles
> for fluidized beds?
>
> thanks in advance, as usual.
>
> jim
>
>
>
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> ----
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-- 
--------------------------------------------------------------------------------
jim mason
website: www.whatiamupto.com
email: jimmason at whatiamupto.com
announce list: http://lists.spaceship.com/listinfo.cgi/icp-spaceship.com
current project: mechabolic (http://whatiamupto.com/mechabolic/index.html)