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Martin you are inspiring me today. </div>
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A.D. How about adding something to the water? If you put in a little ethanol, which I know is very difficult to obtain in India, would it affect the quality of the combustion?</div>
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I know that an ethanol evaporator is possible and it may be that 2 or 5% or 10% ethanol will have some unexpected and beneficial effect on the flame. If all the vapour ends up in the flame there is nothing to lose in terms of fuel waste. </div>
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Co-firing often produces a much cleaner result than at least one of the fuels alone. </div>
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Regards from the DUE Conference </div>
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<span style="font-size: initial; text-align: initial; line-height: initial;">Crispin </span></div>
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<div class="PlainText">Dear Anand and stovers,<br>
<br>
it is great and I am happy, that the ELFD-Sampada stove, invented by your daughter, Dr. Priyadarshini Karve, works excellent.<br>
<br>
I want to invite the stovers, to see and get aware, a general system in this stove.
<br>
<br>
All burners with forced draft are somehow "venturi-burners".<br>
Air-jets shooting into a gas-atmosphere suck gas into that air-jet.<br>
In the TLUDs it is inverted to normal venturi gas-burners, and that is an excellent idea, because woodgas is not really pure gas.<br>
It tends to clog nozzles by tars.<br>
<br>
Now look to the ELFD-Sampada stove as a "double"-venturi burner-system.<br>
1. vapor-jet drives air, in order to make<br>
2. air-jets, which blow into woodgas, and each jet forms by that a "somehow"-venturi-burner, as in a forced-draft TLUD.<br>
<br>
Let me return to the simple gas-venturi-burners to guess about needed pressures:<br>
<br>
LPG burners have a gas-pressure about 30 to 50 mbar; natural gas burners even lower ( 20 to 25 mbar?)<br>
Rough assumed ( I am aware: big ratio-differences are possible): The streaming gas through the nozzle sucks about the same volume of air, to form together an excellent combustible mixture.<br>
If so, that mixture could be made invers too: 30 to 50 mbar air-jet can suck the needed volume of woodgas.<br>
And to get an air-pressure about 30 to 50 millibar:<br>
- A venturi-system driven by steam, -thumb-calculated-; has steam, pressurized to 100 mbar (or easily some lower or higher)<br>
<br>
- Let us assume, that the steam condenses to water,<br>
naturally except the amount of water that is still in gas-form under that conditions (below 100°C).<br>
If the temperature in the system is above 100°C, there will be a lot of water(in gas-form) beside the air.<br>
( same thumb "beginning" assume 50/50 above 100°C ??)<br>
- The ELFD-Sampada shows in reality that the containing water does not disturb the combustion. In contrary it seems to help combustion in combination with forced draft. - I did not hear of speaking there would be water dripping out of the stove.<br>
<br>
What about sooth and water?<br>
<br>
The former discussion in the stoves-list about sooth, made me looking for sooth. I learned it is technically produced in different manners and in different qualities, for lots of purposes. - Yes they really want tons of sooth, we don't even want grams and want
to avoid milligrams-<br>
One solution to form sooth is to spray water into a flame.<br>
Shouldn't we get to know, from industry by what amount of water (and temperature) sooth starts to form, that we can avoid that?<br>
And in contrary: what amount of water(in gas-form) makes burn better??<br>
<br>
The lesson I learned:<br>
As sooth is in parts like graphite, there are C's bound to C's, within a layer forming 6-rings, and that ring is so strong, that it needs more than 1000°C to burn/destroy the C-C-bondages.
<br>
-That means, we have to avoid _from beginning!_ the forming of sooth so strictly as possible, because it is so difficult to get it burnt.
<br>
- The simple truth I want to keep in my awareness: <br>
Sooth is no charcoal-C and needs roughly double the temperature of charcoal to burn!
<br>
<br>
Just some of my ideas from before and after learning about the ELFD-Sampada-stove-<br>
<br>
Kind Regards to all,<br>
- and my compliments to Dr. Priyadarshini Karve.<br>
<br>
Martin<br>
<br>
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