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Oops - Kaboom!!!
03-01-2009, 03:53 PM
Post: #31
Oops - Kaboom!!!
Now thats worryingSad

Real time 50/50<br />http://www.youtube.com/watch?v=X-8TvqnuOCc
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03-01-2009, 04:53 PM
Post: #32
Oops - Kaboom!!!
A review of this message thread with the information that you provided us, GSMGuy, it appears that the cause of your explosion was due to the heater inadvertently turning on when your reaction chamber was empty. At that time your reaction chamber was full of methanol and oil vapors and air, and the immersion resistance heater that you were using to heat your batch came back one when your 24-hour timer cycled through 24-hours, and went red hot, which heated the inside of the chamber up to the flash point of the fuel/air mix in the chamber and it exploded. The solution, as you have already pointed out, is not to use a 24-hour timer, ever, in your process. Or, have a master non-24-hour timer that turns the entire process off after the process is complete.

First I wish to commend you on using a reaction chamber and getting away from the open vat process that typifies the back-yard biodiesel process, because the open vat process is far more dangerous and toxic. On the other hand, I wish to point out that the bio-diesel process is inherently dangerous and it is only remarkable that there have not been far more destructive accidents with so many amateurs now doing it on several continents.

The bio-diesel process is actually so potentially toxic and explosive that it really should only be done by professional chemical engineers in a licensed facility in an industrial park, where, if the process ever got away, it would not cause as much damage to personal property, suffering and death that it could if done in a residential neighborhood, where this process is most often engaged.

In an industrial environment your chamber would have been purged of air either with nitrogen or CO2, and would never have been allowed to have O2 in any concentration inside it. However, most of us back-yard enthusiasts do not have the funding, nor technical expertise, to build properly designed research vessels, nor maintain a store of inert gasses for purging. My recommendation is the individual amateur should leave the bio-diesel process to the professionals and stick with fuel blending; and do it properly, because it too has its hazards.

I cannot urge the moderators of all bio-fuels forums enough to emphasis safety over all other concerns, and if the bio-diesel process is going to be advocated for amateurs that the community of amateur bio-diesel enthusiasts get very serious about designing a hazard-free process. Because, it is inevitable that someone’s bio-diesel process is going to get away, and not just kill him and damage his property, but it could potential burn down a whole neighborhood. And, you can bet, when that happens the political environmental will radically change globally; after that time, anyone found to be making bio-diesel without a license will face stiff fines. So, please forum moderators, can we self-regulate ourselves and do that by starting a whole new forum at the front of this forum that is dedicated to reaction vessel design and safety procedures?

Best regards, Jeffrey S. Brooks

Accidents related to bio-fuel processing

Man hurt in bio-diesel processing, he was using an electric drill for mixing
http://news.bbc.co.uk/1/hi/england/north...527630.stm

Burned barn from bio-diesel process
http://www.vegetableoildiesel.co.uk/foru...p?tid=9413

Oops - Kaboom!!!
http://www.vegetableoildiesel.co.uk/foru...501&page=1

Experimental blending
http://groups.yahoo.com/group/veggie_fue...message/65

Blending Precautions
http://groups.yahoo.com/group/veggie_fue...essage/114
http://www.vegetableoildiesel.co.uk/foru...p?tid=9577

[Edited on 3-1-2009 by jhanananda]
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03-01-2009, 05:03 PM
Post: #33
Oops - Kaboom!!!
A hazzard free processor has been designed and offered as the \'forum standard\', but people seem to prefer the GL system as, I guess it is cheaper and easier to use. Also, the hazzard free processor is hand operated and again, this has seemed unpopular. See:

http://vegetableoildiesel.co.uk/twyntub100.html

Another thing: having a separate heating tank makes the machine more expensive, but, as we have seen, very worth while.

http://www.vegetableoildiesel.co.uk/
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03-01-2009, 05:04 PM
Post: #34
Oops - Kaboom!!!
Since you\'re collating Methanol detonation links, here\'s another one for you:

http://www.vegetableoildiesel.co.uk/foru...p?tid=7878

Biodiesel car history over 100k:
Merc ML270 (CR), Saab 95 2.2TID (VP44), Fiat Grande Punto Sporting 1.9 JTDm (CR), Volvo V40 Sport Lux (CR), VW Passat (PD130), 2x Nissan Largos 2.0ETi (VP37), Mitsubishi Delica 2.8TDI (Bosch VE)
Biodiesel wiki & forum - Used cooking oil collection Southampton
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03-01-2009, 08:42 PM
Post: #35
Oops - Kaboom!!!
Thank-you paddygoat, for posting the link to your reactor design as it looks like an excellent design, and should be held up as the standard, by which all other reactor designs should be based. As you most probably know I have started a new thread based upon accident reports, which will hopefully attract a dialog that will inspire people to look at your design as the model upon which they will build their own reactors, or consider just purchasing your design, or system.

Thank-you tttonyyy, for volunteering another accident report. We who advocate amateur exploration in bio-fuels, really have the responsibility to report and discuss accidents, so that the public is informed and engages responsibly in bio-fuels research.
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03-01-2009, 09:01 PM
Post: #36
Oops - Kaboom!!!
Thanks for finding this post Tony. I was trying to locate it myself - must update the forum!

http://www.vegetableoildiesel.co.uk/
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04-01-2009, 01:33 AM
Post: #37
Oops - Kaboom!!!
Hello paddygoat, I just wanted to write that I reviewed the product description for your Twyn Tub 150 Biodiesel Processor, and was most impressed with its design and construction. I personally cannot believe anyone would make their own processor, when they can buy such a professionally designed and constructed device for such a reasonable price of £115.00. I put more than that into my own system and it took me nearly 6 months to design, develop and build, and in many respects it is no where near as nice as yours.

I do have one question. What pressure is your system rated at? I ask, because I use pneumatic pumping in my system, and I typically run my system at 20 PSI (1.5 bar), and my system is rated to 100 PSI, but I see no reason at this time to take it up that high.

Also, a few comments. As a pilot plant designer, professionally, I would want to see such a system mounted on a welded base frame of angle iron with a steel frame surrounding the entire system with upper braces for the tank, because you just cannot be sure whomever purchases your system is going to mount it properly, if at all.

Also, while at Chevron Research I designed and built several pilot plants about the size of your processor. These units took hydrocarbons up to 1200F (600c), so it was standard operating procedure to install 2” bursting disks on the top of all of these units. The bursting disks were rated for the maximum operating pressure of the chamber and were vented straight through the ceiling with no bends in the 2” vent-line.

Any engineer who had even one of the accidents that have been reported to this forum would have been lucky to have been made janitor, let alone ever find work in the trade again. If I had one of these accidents I would have spent the rest of my life selling cosmetics. So, folks, just buy the Twyn Tub 150 Biodiesel Processor, and save yourself a lot of trouble.
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04-01-2009, 09:51 AM
Post: #38
Oops - Kaboom!!!
£115 gets you the plans, not the processor.

Quote:Our price for complete machine: £2150 + delivery + training. No VAT. Availability: 9th January 2009

Excellent value considering what you get though.

Biodiesel car history over 100k:
Merc ML270 (CR), Saab 95 2.2TID (VP44), Fiat Grande Punto Sporting 1.9 JTDm (CR), Volvo V40 Sport Lux (CR), VW Passat (PD130), 2x Nissan Largos 2.0ETi (VP37), Mitsubishi Delica 2.8TDI (Bosch VE)
Biodiesel wiki & forum - Used cooking oil collection Southampton
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04-01-2009, 10:14 AM
Post: #39
Oops - Kaboom!!!
Thanks for your comments, jhanananda. The machine works at atmospheric pressure and has an open vent to atmosphere. Also, it is mounted on a heavy wooden platform, which comes with the machine. Smile.

http://www.vegetableoildiesel.co.uk/
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04-01-2009, 04:00 PM
Post: #40
Oops - Kaboom!!!
Quote:Originally posted by tttonyyy
£115 gets you the plans, not the processor.
Quote:Our price for complete machine: £2150 + delivery + training. No VAT. Availability: 9th January 2009
Excellent value considering what you get though.
Oops, well, I agree, why not have a properly designed system than risk blowing up your house? How much does a house cost? A lot more than £2150. However, I could see making a few changes in the design to accommodate pneumatic pumping through a filter manifold, and the needs of the blender. The addition of a cyclone separator to drop out particulate and water from WVO steam, etc. but these things can easily be added later by the consumer to the Twyn Tub 150 Biodiesel Processor
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[Edited on 4-1-2009 by jhanananda]
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