[Stoves] Equipment required for testing stoves

[rongretlarson at comcast.net]

Alex etal 

Thanks for the cite. I think I understand most of the plot - which was of amazing duration!. I am especially amazed at how uniform (and high) the flame temperature was in the late time plot, even as the other plots were dropping. 

a. Since you have this one from 2000, you probably have quite a few more - from which I/we might extract a good bit more information/ Any other similar plots around that you can post? 

b. I am surprised that the "pyrolysis gas temperature" was so much lower than the temperature of the char. Where was the probe for this measurement - and had there been some mixing of secondary air at this point? 

c. What is the present disposition of this equipment? 

Nice work 

Ron 





----- Original Message -----
From: "Alex English" <english at kingston.net> 
To: "Discussion of biomass cooking stoves" <stoves at lists.bioenergylists.org> 
Sent: Friday, December 7, 2012 8:01:00 PM 
Subject: Re: [Stoves] Equipment required for testing stoves 


Hi Ron, 
Josh's numbers are similar to what I have seen. 
One test is reported here in the year 20000 :) 
http://stoves.bioenergylists.org/stovesdoc/English/bigtop2.htm 
Here the peak temperature was around 1400F or 760C. 

More recently I made an effort to operate a wood pellet filled TLUD at its slowest/coolest or minimum primary air setting. The peak temperature achieved in the descending pyrolysis front was 480C. This was measured well away from the chamber walls. Near or next to the steel wall or exterior the pellets are cooler and appear brown as torrified, presumably <300C. Based on a similar but different test run, the container itself, if painted on the outside, would not even show paint damage below the pellet line. 

Regards, 
Alex 



Butsince the temperatures could be so helpful, I hope anyone else who has used thermocouples can also report in on their results - especially if anything was variable and the (relatively constant) interior fuel bed temperatures changed appreciably. I have certainly seen plots like yours - but nothing to show how temperatures changed - and as dramatically (600-900 C) as did yours with the same stove operated differently. I am guessing that your system could get as low as 400 or 500 C - with either fewer upper cans or a slower fan speed. Better understanding this ability to produce chars of different character should be a hugely valuable experimental result. I think this can be done with one thermocouple, not needing 3-4. 












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