[Stoves] Bangladesh TLUD (was Re: No subsidies in TLUD char peoduction

[Crispin Pemberton-Pigott]

Dear Andrew

I can only answer that because I am involved at this moment in a comparison of combustion chamber materials experiments.

High alumina materials (above 60% Al2O3) are available in at least three formulations, all castable refractory materials. High alumina castable materials can take 1300 C if the normal bottom of the mine one is used. They are available for much higher Temps. Thermal conductivity is about 1.5. Some, fired to 1300 can take 1700 C thereafter.

The high alumina Silicon Carbide can take the same, and again are available for higher Temps for a higher price. The SiC materials are dens (2.8) and highly conductive of heat. The higher conductivity gives a material that can take tremendous thermal shock. The conductivity is about 2.0.

The third is the plastic refractory material ‎I have been talking about. It is a phosphoric acid bonded high alumina, but doesn't need to be fired. After curing and drying they can take 1300 as well.

For price they are a good choice for TLUDs but access might be a problem. It depends on where you are. Figure on $0.60 per kg at source.

Regards
Crispin



On 9 December 2017 at 13:47, Crispin Pemberton-Pigott
<crispinpigott at outlook.com> wrote:
> Dear Andrew
>
>
>
> Good question and relevant to Julien's work:
>
>
>
>>How hot can portland cement get before it breaks down?
>
>
>
> 400˚C.

Thanks Crispin

What about high alumina cement?

 The perceived wisdom is that the descending  pyrolysis front is 600C
plus or minus 100C so depending on the thermal conductivity of the
clay slip and concrete it may not get that hot.

Andrew

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