[Stoves] the 150 gasifier in operation in Vietnam (Matt Redmond)

[Paul Olivier]

Very good, Ron.

Paul

On Fri, Mar 9, 2012 at 7:21 AM, <rongretlarson at comcast.net> wrote:

> 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" <paul.olivier at esrla.com>
> *To: *mredmond3 at gatech.edu
> *Cc: *"Discussion of biomass cooking stoves" <
> stoves at lists.bioenergylists.org>
> *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 <mredmond3 at gatech.edu>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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-- 
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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