[Stoves] [Gasification] Re. Stoves] Oxygen Sensors for all combustion...

[Thomas Reed]

Dear Alex and Christine and All:

Vivian and I remember your visit ten years ago and Christine's 
spinning.  Our daughter Katherine lives in Barre MA. and has 38 
Alpacas.  Nice fiber.  You should meet....
------------------------------------------------------------------------
That visit resulted in a bet that I could gasify/burn 25% moisture 
content wood in my WoodGas campstove.   Tests showed that I could burn 
30 % MC chips with a very blue flame, but that the char yield had 
diminished to < 5%. 
------------------------------------------------------------------------
Glad to know you are measuring combustgion gases with the oxygen sensor. 

However, I'm not sure whether the wide band Bosch is needed, since the 
formula for the voltage

V = nF/RT ln p[(O2-1)p(O2-2)]

only applies to the cheap 2 or 4 wire sensor.  If money is no object and 
you want to run 3% lean, it is probably needed.  If you want to know 
where you are from very lean to very rich, the 4 wire is probably better. 

I look forward to the day when most combustion devices use an oxygen 
sensor to get it right, maximize efficiency and minimize emissions. 

(like our cars).

Your (naot so) old pal,

TOM REED    BEF/BEC




Alex and Christine English wrote:
> Dear All, et Tom,
> It must be over ten years a go that I discussed this with you and Das.
> Back then I ran some experiments with the standard auto sensors and posted the 
> results. Over the last six weeks I have managed to adapt the wide band Bosch LSU 
> 4.2 sensor that comes  with the Innovate Motorsport LM 1 to monitor stack conditions
> on the  150 HP chip fired boiler that heats greenhouses that support me. We have it 
> set up to feed the data into the boiler plc and control the overfire variable speed fan.
>
> It works.  As long as the conditions just above the fuel are fuel rich the over fire fan will 
> chase the excursions (or back off)  and keep the mix optimal for good  combustion.
>
> Has any body found anthing like this coming off the shelf that isn't priced for industry?
> They are using something like this in household boilers in Europe. We have spent 
> about $500 for parts but with some help from some electronic wizards this could be 
> made opensource and, perhaps, even more affordable.
>
> Alex
>
>
>
>
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