[Gasification] Any experience with Stak Properties 10K gasifier?

Otto Formo terra-matricula at hotmail.com
Wed Jun 22 07:22:02 CDT 2011


Dear all,
How come that pellets does not operate very well in a gasifier unit like the 10K?
I know that pellets made out of pine and sproose wood have a bit high content of soot.I belive that the pellets made out of trees with leaves have less black carbon and gives a cleaner burn.
We are using 6-8 mm wood pellets made out of mainly pine in the TLUD ND PekoPe and it works perfectly for cooking/heating and production of biochar.These are quality pellets, according to European Standards, with low density.We would like to have sizes of 10 to 15 mm, if possible, but these are not available in the commercial marked, yet.
Its good news to hear that pellets of Switchgras is working well.Hopefully pellets of Vetriver grass will do the same?
Otto F.
  > From: Bill_Klein at Powerhearth.com
> To: gasification at lists.bioenergylists.org
> Date: Wed, 22 Jun 2011 07:36:44 -0400
> Subject: Re: [Gasification] Any experience with Stak Properties 10K gasifier?
> 
> Hi, Kevin.
> 
> Your question of feedstock size is rather interesting and one to which I can 
> easily relate. That said, I hope the following provides a little bit of 
> insight and doesn't aggravate the experts on this list.
> 
> Before we ship our units, they undergo several tests.
> 
> Test 1 is a 24 hour non stop test in which we push all of the limits. Said 
> differently, we look for the weaknesses, leaks, etc.
> Test 2 is another 24 hour non stop test. It provides us with systems 
> calibration.
> Test 3 is a 100 hour non stop test. During this period, all of the necessary 
> data points are established for our automation and management system.
> 
> Why am I describing an important phase of our unit fabrication, truncated as 
> the description may be?
> 
> I wanted to point out the importance of properly sized feedstock for, if 
> there is a screw up with gas flow or aglomeration, the test is stopped and 
> rerun.
> 
> When we test, depending upon the customer's intended feedstock, we test and 
> evaluate the gas from at least three feedstocks, one of which is a close 
> approximation of that which the customer will use. Size of the feedstock is 
> critical unless one really enjoys non stop runs, grumpy technicians and 
> buckets of coffee.
> 
> Pellets: We won't use them. They are seldom uniform (cross sectionally) in 
> moisture content and generally sealed. With heat, they shatter 
> magnificently, leaving a pile of sawdust. The exception seems to be 
> pelletized switchgrass: a great feedstock.
> 
> The chip size we like resembles an Oreo cookie, squared. As an approximation 
> it works to gauge sizes. Overall length or width uniformity doesn't seem to 
> be as critical as thickness. Still, there is a lot of flexibility and 
> smaller sizes are okay to integrate, as an exception, not the rule. 
> Gasifiers are not stoics. Built properly, they have some versatility, but 
> you have to make friends with your unit before you learn her secrets. Then 
> you merely have to respect them. .
> 
> Charcoal briquettes as a feedstock too often creates a huge problem as they 
> plug the grate with compacted fines.
> 
> The best and my most favorite feedstock is still chunks. 2x4x4 - or 
> briquettes of almost anything.
> 
> Kevin, I would have gladly answered earlier, but you posted hours after my 
> bedtime. We old folks need our beauty sleep.
> 
> 
> Respectfully,
> 
> Bill Klein
> 3i
> 
> 
> 
> 
> 
> ----- Original Message ----- 
> From: <kchisholm at ca.inter.net>
> To: <gasification at lists.bioenergylists.org>
> Sent: Tuesday, June 21, 2011 10:13 PM
> Subject: Re: [Gasification] Any experience with Stak Properties 10K 
> gasifier?
> 
> 
> Dear Bill
> 
> Quoting Bill Klein <Bill_Klein at Powerhearth.com>:
> 
> > To underscore Greg's email, repeating what I was taught, "The
> > quality of the gas is in direct proportion to the quality of the
> > char." Larger feedstock makes great char!
> 
> # OK!! Do you think one can make "Engine Grade Gas" using:
> 1: Wood pellets, 1/4" diameter, 1/4" to 1/2" long?
> 2: Wood chips screened to -1/4", +1/8"?
> 3: Wood chips screened to -1/2",+ 1/4"?
> 4: Wood chips screened to -1", + 1/2"?
> 
> Thanks!
> 
> Kevin
> >
> >
> > Respectfully,
> >
> > Bill Klein
> > 3i
> >
> > http://www.3iAlternativePower.com
> >
> >
> > -- Original Message -----
> >   From: Greg Manning
> >   To: Discussion of biomass pyrolysis and gasification
> >   Sent: Tuesday, June 21, 2011 7:40 PM
> >   Subject: Re: [Gasification] Any experience with Stak Properties
> > 10K gasifier?
> >
> >
> >   Pete, (and list)
> >
> >   What, and how big, are the fuel chunks ?
> >
> >   most gasifiers do NOT like wood chips, or really "fine" fuel, the
> > interstitial space the gasifier is designed to run with, is
> > generally much larger than that of chips or fine feedstock, using
> > the correct sized fuel, in-turn, lowers the reaction core
> > temperature, thus creating more, and more consistant amounts, of CO.
> > (the main flamable gas, in woodgas). (H2 and CH4 are simply "bonus"
> > gases.....)
> >
> >   Greg Manning.
> >
> >
> >
> >
> >
> >
> >   On Mon, Jun 20, 2011 at 6:01 PM, Pete & Sheri
> > <spaco at baldwin-telecom.net> wrote:
> >
> >     Has anyone here had any experience running an engine using the
> > Stak Properties 10K gasifier?
> >
> >
> >
> >     They tell me that the JXQ-10 gasifier is a forerunner to this
> > machine. I have one of those.  I?d like to be able to correspond
> > with others who have this style of machine.  Currently I am having
> > mixed results getting a steady flow of good gas to run my   6.5 KW
> > Onan 1800 rpm genset from it.  On Saturday, I got it to deliver
> > about 3.8 kw for about 12 minutes, but then the quality of the gas
> > deteriorated.  On Sunday a similar test produced worse results, but
> > over about a one hour period, with gas quality again deteriorating
> > as the test went proceded.
> >
> >       I am not writing to waste the time of senior members here by
> > asking them to troubleshoot my problems, without enough info.  Just
> > want to show what kind of issues I have for those who might be
> > involved with similar equipment.
> >
> >       My goals are to: 1. See how much power I can squeeze out of
> > the generator for an extended period of time with this gas source,
> > and 2. To get some actual experience making woodgas.
> >
> >
> >
> >     Looking back over my videos and notes, I can see a dozen or two
> > things that I could do better next time.
> >
> >
> >
> >     Pete Stanaitis
> >
> >
> >     _______________________________________________
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> >
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> >
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> >
> >
> >
> >
> >
> >   --
> >    Regards,
> >
> >   Greg Manning,
> >   Brandon, Manitoba, Canada
> >
> >
> >
> > ------------------------------------------------------------------------------
> >
> >
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> >
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> 
> 
> 
> 
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