[Stoves] Fuel cylinder temp experiment needed (was Re: Bangladesh TLUD (was Re: No subsidies in TLUD char peoduction

[Gordon West]

On a freshly polished 16 ga steel cylinder you can watch the pyrolysis front travel because of the oxidation spectrum. In ours the front shows up as being about .5” wide  - I haven’t thought to correlate it to a temperature chart. But we have used an infrared gun and commonly see temps of 300C, and I think up to 450C. Since the question has been asked, we will make a point to verify this information. 

We are also using thermocouples to measure pyrolysis temp in the center and find 700-800C to be common in a 6” diameter cylinder with fan forced primary air.
 
Gordon
The Trollworks

 


> On Dec 9, 2017, at 8:08 AM, Andrew Heggie <aj.heggie at gmail.com> wrote:
> 
> On 9 December 2017 at 14:11, Paul Anderson <psanders at ilstu.edu> wrote:
>> Julien,
>> 
>> Truly excellent observations about Bangladesh efforts.
>> 
>> Adding this thought:  Thinking of a standard TLUD with metal fuel chamber,
>> has anyone measured the temperature of the outside wall of that fuel chamber
>> as the pyrolytic front moves to it, is at it, and then past that point of
>> measurement?
> 
> 
> The emissivity of common dull materials is similar so most of the
> infra red thermometers assume 95% but the cheaper ones like mine only
> measure up to 200C.
> 
> Steel workers have wax crayons that change colours at known
> temperatures so one could draw vertical lines down the  reactor
> cylinder.
> 
> I used to use my kids' wax crayons in this way to show the progress of
> the front in my 4" flue tube experiments.
> 
> Andrew
> 
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