Dear Tom,
That is where I had to come up with other than a fixed surface heat
exchanger configuration. Higher temperature is not as much of a
problem. As to filtration, I have never seen a carbon filter and only
suspect why it is not used is the cost in comparison to say paper. For
diffusion systems, cost was no object, but they have been replaced with
centrifuges.
Sincerely,
Leland T. "Tom" Taylor
Thermogenics Inc.
-----Original Message-----
From: Tom Miles <[email protected]>
To: 'Discussion of biomass pyrolysis and gasification'
<[email protected]>
Sent: Mon, Jul 16, 2012 7:35 am
Subject: Re: [Gasification] Graphite Heat Exchangers for Producer Gas?
I’m looking at the cold end, cooling from 200C down to 30C where
coating has not been a problem. Tom From:
[email protected]
[mailto:[email protected]] On Behalf Of
[email protected]
Sent: Monday, July 16, 2012 3:12 AM
To: [email protected]
Subject: Re: [Gasification] Graphite Heat Exchangers for Producer
Gas? Not worth messing with in my opinion. 1. Any fixed
surface will still coat, even at very low tar content. 2. At high
temperature, C+CO, C+H2 reactions will eat up graphite, 3. if resin
coated, will not handle temperature and solvents in the gas.
Sincerely,Leland T. "Tom" Taylor
Thermogenics Inc.
-----Original Message-----
From: Viswanathan KS <[email protected]>
To: Discussion of biomass pyrolysis and gasification
<[email protected]>
Sent: Sun, Jul 15, 2012 10:12 pm
Subject: Re: [Gasification] Graphite Heat Exchangers for Producer
Gas?Process for producing graphite tubes:
Quote
Synthetic graphite is manufactured from crude oil cokes and pitch. The
pasty mixture is shaped into
monolithic blocks or tubes. Tubes are extruded whereas blocks are
usually vibration molded. The
shape is then carbonized at 900ºC (1650 F)for a few hours and then
fully graphitised at 2900ºC (5250
F) for several days. The block or tubes are then impregnated with
synthetic resin that is then
polymerized to render them totally impervious to gases and fluids.
The resulting material is fully corrosion resistant to most common
acids (sulfuric acid, hydrochloric
acid and of course industrial phosphoric acid) and has a very high
thermal conductivity of around 80
W/m.K for tubes or 140 W/m.K for blocks when totally graphitised. The
tube wall is quite thick, 6
mm (1/4”) and the individual tubes are 3 meters (10’) long.
Unquote
ksvOn Mon, Jul 16, 2012 at 9:27 AM, Bob Stuart
<[email protected]> wrote:In the early days of graphite
fiber/graphite matrix brake disks on race cars, the ceramic coating
would sometimes crack, allowing oxygen onto the hot graphite. The
result became known in the pits as "Designer Coal."
Bob
On 15-Jul-12, at 9:50 PM, Viswanathan KS wrote:
IMO the graphite tubes are not coated.On Mon, Jul 16, 2012 at 8:45 AM,
Bob Stuart <[email protected]> wrote:Would the coating that
protects the graphite from oxidation not also work on copper?
Bob
On 15-Jul-12, at 8:10 PM, Tom Miles wrote:
Graphite heat exchangers are now used on domestic condensing hot water
boilers. (See SGL Group.) Heat transfer is reportedly 8 times that of
stainless steel. Why not use them for cooling and condensing producer
gas?
Tom
_______________________________________________
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/
_______________________________________________
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/
_______________________________________________
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/
_______________________________________________
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/
_______________________________________________Gasification mailing
list to Send a Message to the list, use the email
[email protected] to UNSUBSCRIBE or Change your
List Settings use the web
pagehttp://lists.bioenergylists.org/mailman/listinfo/gasification_lists.b
ioenergylists.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/
_______________________________________________
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/
