[Gasification] Excellent Producer Gas analysis...
tombreed2010 at gmail.com
Thu May 21 12:33:42 CDT 2015
Dear Peter, and all:
I meant in my last post to complement you on the excellent analysis which you and SGS supplied of the producer gas made. (I believe the "descending bed downdraft is similar to "TLUD", toplit updraft?) It's hard to believe, but certified analyses of the producer gas are quite rare. (Not hard to believe when you see all the equipment required.)
I started to write down the weight % analysis and convert to mole% to see how if the calculated results would batch the predicted results.
Then I realized that any H2O formed was missing. Very difficult to do a complete balance without the H2O. And, really, unnecessary, since we know the formulas for all of the components....
Thomas B Reed
280 Hardwick Rd
Barre, MA 01005
508 353 7841
> On May 20, 2015, at 3:30 PM, Peter Davies <idgasifier at gmail.com> wrote:
> Dear Tom,
> I hope this finds you well, I noticed your post to the list below and thought I would share some of our recent success with you. Our system is not a TLUD, but it is not a conventional downdraft either and was described by a visiting scientist as "A descending bed downdraft". It is nonetheless perhaps of interest in regard your balances below.
> We have been getting formal gas analysis through SGS here in Australia (NATA certified lab results) as follows:
> CO - 15%
> H2 - 30%
> CH4 - <1%
> CO2 - 8%
> N2 - balance. (IE 47%)
> This with a co-product yield of around 20% of charcoal (dry basis)...Starting with wood chips @22% mc.
> The 2:1 ratio of H2:CO suggests the extra H2 is coming from the moisture cracking.
> Gas sampling was undertaken using a purpose built column designed to give uniform mixing and flow at the sampling point and the sample was taken using a certified SGS vacuum flask for such sampling. (pic attached). I have also included a couple of files from recent testing on pelleted cotton gin trash (which is giving similar test results to wood chip). The flare video was taken 3 minutes after first start-up onsite, cold bed no char in starting sample. I was simply using the hand held butane torch to see if any CO was beginning to come through (you see a color change around the butane flame), I had just begun telling my wife that it looked like it was not far off from ignition.... No filtering beyond a cyclone and simple condensate trap. The other picture is carbonised cotton pellets that come out as the co-product, they have a higher value as char than their embedded energy in Australian situations.
>> On 21/05/2015 3:57 AM, Tom Reed wrote:
>> Dear Anand and All:
>> Thanks for your comments. I am so glad that the TLUD principle, first used in our cook and camp stoves about 1985, is finding broader uses now. It depends on the facts:
>> Wood is comprised of 80% Cellulose and only 20% lignin
>> When the fuel is lit ON TOP, the cellulose is vaporized:
>> Celllulose, a great fuel which breaks down about 330 C to form H2 and CO
>> C6H10O5 + heat ===> 5 CO + 5 H2 + C
>> This gas is useful for cooking and running engines.
>> The 20% lignin in the wood is uniformly converted to charcoal.
>> This works on wood at any scale. The cellulose gas is relatively clean and is fine for cooking as is. For engine use, passing the gas through a container of previously produced charcoal is sufficient to cool and clean it for engine use.
>> Yours for clean cellulose gasification and char production,
>> TOM REED
>> Thomas B Reed
>> 280 Hardwick Rd
>> Barre, MA 01005
>> 508 353 7841
> Peter Davies
> ID Gasifiers Pty Ltd
> Delegate River, Victoria
> Ph: 0402 845 295
> <Bedding in test gasifier.wmv>
> <char pellets.jpg>
> <gas sampling.jpg>
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