Very good, Ron. Paul
On Fri, Mar 9, 2012 at 7:21 AM, <[email protected]> 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" <[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/ > > _______________________________________________ > Stoves 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/stoves_lists.bioenergylists.org > > for more Biomass Cooking Stoves, News and Information see our web site: > http://www.bioenergylists.org/ > > > _______________________________________________ > Stoves 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/stoves_lists.bioenergylists.org > > for more Biomass Cooking Stoves, News and Information see our web site: > http://www.bioenergylists.org/ > > > -- 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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