[Gasification] Graphite Heat Exchangers for Producer Gas?

[Viswanathan KS]

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

ksv
On Mon, Jul 16, 2012 at 9:27 AM, Bob Stuart <bobstuart at sasktel.net> 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 <bobstuart at sasktel.net> 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
>>>
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