[Gasification] fluidized bed temps?

Sat Aug 4 20:30:39 EDT 2007

CRC is the "Chemical and Rubber Company".  They publish numerous reference books on subjects related to the chemical industry and though usually expensive are excellent information sources.

MK

----- Original Message ----
From: Tom Miles <tmiles at trmiles.com>
To: Discussion of biomass pyrolysis and gasification <gasification at listserv.repp.org>
Sent: Saturday, August 4, 2007 9:00:21 AM
Subject: Re: [Gasification] fluidized bed temps?

Combustion and Gasification in Fluidized Beds, by Prabir Basu, 2006, CRC
(Taylor & Francis)

Available from Amazon.com
http://www.amazon.com/exec/obidos/ASIN/0849333962

See discussion in the archives starting May 15:
http://listserv.repp.org/pipermail/gasification_listserv.repp.org/2007-May/0
07675.html

You won't find a design manual for fluidized beds. Many of the design
parameters are in theses and papers in the 1980s and after as people adapted
experience from petroleum cat crackers to coal and biomass. ASME has had a
series of fluidized bed conferences for 20 years where companies and
research labs have reported their experiences although I do not find the
proceedings on the ASME site. http://catalog.asme.org/

Tom

-----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 10:00 PM
To: Discussion of biomass pyrolysis and gasification
Subject: Re: [Gasification] fluidized bed temps?

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
>
>
>
> --
>
----------------------------------------------------------------------------
> ----
> jim mason
> website: www.whatiamupto.com
> email: jimmason at whatiamupto.com
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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)

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