Paul, Matt, list:
I like your (earlier) idea of a ceramic "strainer". You might want
to start by doing more googling on the topic of "ceramic foam" - which
seems to be a relatively new sub-discipline of the ceramic industry.
The
"foam" companies seem to be able to produce a material which can serve
as a
strainer (open cell structure, not closed) - which will allow the hot
gases
to flow through the foam.
Here is one example of a group explaining this sort of work:
http://www.madehow.com/Volume-5/Ceramic-Filter.html#b
There are plenty of companies doing this "foam" work - to be found
via
googling.
Following Matt's suggestions below, there may be a place also for
"rock wool" - vs glass fiber (to get higher temp capability.
If you use metal (as below), I think a thin ceramic coating might help
on longevity, if the coating is thin enough. Will be hard to match
coefficients of thermal expansion, but may be possible .
Ron
------------------------------
*From: *"Paul Olivier" <[email protected]>
*To: *[email protected]
*Cc: *"Discussion of biomass cooking stoves" <
[email protected]>
*Sent: *Thursday, March 8, 2012 4:54:46 PM
*Subject: *Re: [Stoves] the 150 gasifier in operation in Vietnam (Matt
Redmond)
Matt,
One way to solve the problem of what material to use in a wire mesh
dome
is to view the wire mesh as a disposable item that might last but a
few
months.
I found an easy way to insert a 304 stainless steel wire mesh disk (30
mesh) into a rigid receiving structure that is dome-shaped.
When a flat wire mesh disk is pushed into the shape of a dome, it
exerts
a lot of pressure against the receiving structure.
Nothing has to be welded.
When it wears out, it is pulled out, and another disk is put in its
place.
Thanks.
Paul
On Wed, Mar 7, 2012 at 7:44 PM, Matthew Redmond
<[email protected]>wrote:
Ron, List,
Interesting find. You reported that the silicon carbide meshes for
drywall sanding are really just paper meshes coated with silicon
carbide.
I was trying to think of other materials that can handle high
temperatures and ceramics came to mind. Ceramics are often used in
metal
casting processes. Aluminum Oxide, or even some sorts of fiberglass
have
high working temperatures. Ceramics generally have higher emissivity
than
metals (~ 0.7 I think).
It looks like fiberglass meshes are often used to filter molten
aluminum
and iron for casting operations. Perhaps something like this would
have
longer lifetimes? Again, cost may become a big issue, but here are 2
that I
found:
http://www.ecplaza.net/trade-leads-seller/fiberglass-mesh-for-aluminium-filtration--6816138.html
http://www.king-in-china.com/productview.asp?id=954
Just throwing a few more ideas out there.
-Matt Redmond
--
Paul A. Olivier PhD
27C Pham Hong Thai Street
Dalat
Vietnam
Louisiana telephone: 1-337-447-4124 (rings Vietnam)
Mobile: 090-694-1573 (in Vietnam)
Skype address: Xpolivier
http://www.esrla.com/
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