[Stoves] Jatropha and its future

Fireside Hearth firesidehearthvashon at hotmail.com
Sun Aug 7 22:09:28 PDT 2011


Evening Crispin.....

         Hey you really respond fast and with lots of good stuff! So the Glycerin I have in my possession (and can get well over 5000 gallons for free) is a viscous liquid like maybe the consistency of synthetic oil, brown in color. It does not gel at freezing temps as the guys who make the bio diesel "cook" in a way which keeps it from gelling at our normal winter temps I think. We tried soaking paper logs, wood chips, etc......damn messy. Thats why I think an injection or drip application. I also don't yet have any info on how fast the combustion chamber might need cleaning as I kind of back burnered the idea untill I got Kimberly finished. Anyone played with different ways of burning this stuff?

thanks, Roger.....  

From: crispinpigott at gmail.com
To: stoves at lists.bioenergylists.org
Date: Mon, 8 Aug 2011 00:35:46 -0400
Subject: Re: [Stoves] Jatropha and its future



Dear Roger The glycerine-as-fuel is interesting. There is a lot of glycerine produced in the oil pumping business – it sticks to the inside of the pipes. What happen to it these days? Vaseline was developed to get rid of it at a profit! If it is cheap (might not be) it can be ‘canned’ like ethanol gel. Ethanol does not have a very high heat content (hence the poor mileage cars currently get compared with real gasoline). Watered-down ethanol is pretty crummy. James Robinson at the SeTAR Centre has seem some at 18 MJ/Litre or even less. Prof Philip Lloyd was running a stove on a fuel that had so much water in it, it was condensing on the underside of the pot and dripped so much it extinguished the fire!! Ha ha! So what is the heat content of glycerine? How much does it cost? Where does it come from? Is there much available? What is the melting temperature?  Philip: what is the vapour pressure and so on? Have you ever tried burning it? [Philip reads this list.] Most alcohol burning stoves are terrible – that is my biased assessment. They are usually choked to death near the evaporation zone and have very short flame spaces, followed by too much air supply, yielding a smelly burn – smelling like partly burned gel compound. We test quite a number of them. There is a belief that if the fuel is ethanol, the emissions are inherently low, which is not true. The emissions are potentially low because the fuel is usually pretty good, but emissions are produced by the stove+fuel combination. If the burner is poorly constructed, it’s gonna smell. You know those little pots of flame under the vegetables at the restaurant buffet? Terrible combustion efficiency. Lotsa CO. RegardsCrispin  From: stoves-bounces at lists.bioenergylists.org [mailto:stoves-bounces at lists.bioenergylists.org] On Behalf Of Fireside Hearth
Sent: 08 August 2011 00:20
To: stoves at lists.bioenergylists.org
Subject: Re: [Stoves] Jatropha and its future     Thank you Crispin....

             These are all great ideas! Do you have any gut level sense of what downsides there could be with regard to emission? would I find these to be "fairly clean" fuel options? The glycerine did produce a scent/smoke free burn once temperatures got high enough, however getting there was both smelly and irritating. My delivery system I believe will need to advance to (possibly) a fuel injector, unless something less complicated (oil drip) can be thought up with any reliability. I actually started this project as a pellet stove with a simple 12 volt auger and timing block system. I could go back to that to push grains, seeds, or pitts....even dung! The electrical demand would be covered by solar, and at some time I wish to experiment further with thermocoupling the stove for a truly off grid, self powered pellet stove. I am saving these posts which get me thinking so once my current project is underway I can revisit them. With the level of expertise represented here many  things are exciting possibilities......this is one e-mail I will save for the near future and look for more information on as I develop new ideas. Thank you very much.
Roger  
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