[Stoves] the 150 gasifier in operation in Vietnam

Tue Mar 6 02:09:09 CST 2012

Kevin,

I understand what you mean by an oxidizing atmosphere.

I do not know what quality of stainless steel is used in the strainer that
I have been using.
But it is definitely stainless steel, and it lasted three runs.
I would assume that stainless steel is better than mild steel.
Would you agree?
Ordinary grades of stainless steel becomes brittle when subjected to this
kind of heat.
446 stainless steel might have a chance.

Silicon carbide cloth is much cheaper than stainless steel,
 and it is far more resistant to heat than stainless steel.
But I am not sure at what temperatures it emits the most thermal radiation.

Paul

On Tue, Mar 6, 2012 at 1:23 PM, Kevin <kchisholm at ca.inter.net> wrote:

> **
> Dear Paul
>
> ----- Original Message -----
> *From:* Paul Olivier <paul.olivier at esrla.com>
> *To:* Discussion of biomass cooking stoves<stoves at lists.bioenergylists.org>
> *Sent:* Tuesday, March 06, 2012 1:00 AM
> *Subject:* Re: [Stoves] the 150 gasifier in operation in Vietnam
>
> Kevin,
>
> I do not think that normal mild steel wire mesh would make it through a
> single gasifier run.
>
> # Certainly, "red hot mild steel" in an oxidizing air atmosphere will
> scale up and fail quickly. However, you don't have that.... you have a
> combustion zone atmosphere. It is very simple and cheap[ to try. Try it,
> and let the screen itself tell you that it needs to be of higher quality.
>
> I'm afraid that it has to be something "exotic".
>
> # Let the system prove to you that it needs to be exotic. :-)
>
> This wire mesh really gets hot.
>
> # "Hot" is one thing, but "oxdizing atmosphere" is another. If the
> atmosphere the screen "sees" is "adequately reducing", then mild steel
> might be an economically good solution. On the other hand, as the
> atmosphere becomes increasingly oxidizing, then the more exotic materials
> are required.
>
> Someone measured the temperature about 4 inches above the dome.
> When the probe reached 500 C, he stopped.
>
> # A material that would fail in air at 500 C might be quite acceptable in
> a reducing atmosphere at 500 C
> # The problem is one of Temperature AND Atmosphere. You could probably
> reduce costs safely, with a test program that confirmed the minimum quality
> screen material that would do an acceptable job.
>
>  Best wishes,
>
> Kevin
>
> Thanks.
> Paul
>
> On Tue, Mar 6, 2012 at 11:39 AM, Kevin <kchisholm at ca.inter.net> wrote:
>
>> **
>> Dear Paul
>>
>> Why not start with simple mild steel screen, of various sizes, and test
>> them to see how long they last?
>>
>> Exotic materials will probably last longer, but at a very much higher
>> cost.
>>
>> Once you have cost and "lifetime" information, then you can make the best
>> decision about what materials to use.
>>
>> Best wishes,
>>
>> Kevin
>>
>>  ----- Original Message -----
>> *From:* Paul Olivier <paul.olivier at esrla.com>
>> *To:* Discussion of biomass cooking stoves<stoves at lists.bioenergylists.org>
>>  *Sent:* Tuesday, March 06, 2012 12:12 AM
>> *Subject:* Re: [Stoves] the 150 gasifier in operation in Vietnam
>>
>>  446 stainless can handle temperatures as high as 1,200 C.
>> Silicon carbide is quite cheap, and it can handle temperatures as high as
>> 1,650 C.
>> http://accuratus.com/silicar.html
>>
>> Thanks.
>> Paul
>>
>> On Tue, Mar 6, 2012 at 11:02 AM, Anand Karve <adkarve at gmail.com> wrote:
>>
>>> Dear Paul,
>>> I have not worked with that grade of stainless steel and also not worked
>>> with silicon carbide mesh.
>>> Yours
>>> A.D.Karve
>>>
>>>  On Tue, Mar 6, 2012 at 11:58 AM, Paul Olivier <paul.olivier at esrla.com>wrote:
>>>
>>>> A.D.,
>>>>
>>>> I am looking for a 446 stainless steel wire mesh.
>>>> Have you ever worked with silicon carbide mesh?
>>>> It is used as an emitter in thermophotovoltaics.
>>>>
>>>> Paul
>>>>
>>>> On Tue, Mar 6, 2012 at 10:54 AM, Anand Karve <adkarve at gmail.com> wrote:
>>>>
>>>>> Dear Paul,
>>>>> even stainless steel is no good. At high temperature, it corrodes and
>>>>> crumbles into pieces.
>>>>> Yours
>>>>> A.D.Karve
>>>>>
>>>>>  On Mon, Mar 5, 2012 at 4:03 PM, Steve Taylor <
>>>>> steve at thetaylorfamily.org.uk> wrote:
>>>>>
>>>>>>
>>>>>>
>>>>>> On 5 March 2012 02:56, Paul Olivier <paul.olivier at esrla.com> wrote:
>>>>>>
>>>>>>>
>>>>>>> I know that a tungsten wire mesh exists.
>>>>>>> But no doubt this would be too expensive.
>>>>>>>
>>>>>>>
>>>>>> Tungsten will oxidise to nothing very quickly. Probably Incoloy would
>>>>>> be ideal
>>>>>>
>>>>>> Steve
>>>>>>
>>>>>> _______________________________________________
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>>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> ***
>>>>> Dr. A.D. Karve
>>>>> Trustee & Founder President, Appropriate Rural Technology Institute
>>>>> (ARTI)
>>>>>
>>>>>
>>>>>
>>>>> _______________________________________________
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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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>>>>
>>>
>>>
>>> --
>>> ***
>>> Dr. A.D. Karve
>>> Trustee & Founder President, Appropriate Rural Technology Institute
>>> (ARTI)
>>>
>>>
>>>
>>> _______________________________________________
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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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>>
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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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>

-- 
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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