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

Mark E. Ludlow mark at ludlow.com
Thu Jun 23 02:02:52 CDT 2011

Holes in the concrete wall? now THAT is impressive!

Very interesting and enlightening contribution. Thanks, Robert!

>-----Original Message-----
>From: Robert Kana [mailto:sinan at biomassindo.com]
>Sent: Wednesday, June 22, 2011 11:26 PM
>To: 'Bill Klein', 'Discussion of biomass pyrolysis and gasification'
>Subject: Re: [Gasification] Any experience with Stak Properties 10K gasifier?
>Dear Bill, Kevin and all,
>Thanks for the valuable information. As you put it very clearly, 
>successful gasification starts with a " Good prepared fuel" and 
>continues with well built gasifier.
>For pellets we don't have so much experience, but we know they are made 
>with pressure and the heat caused by friction. On the other hand, 
>briquettes made with hydraulic press or screw press. Material has to be 
>dried to 10-15 % moisture hydraulic systems have pressure 1300-1700 
>kg/cm2, screw systems double that pressure up to 3000 kg/cm2 depending 
>on screw design... On screw systems, forming cylinder is also heated 
>around 300 degrees Celsius.  I can break the concrete walls with the 
>briquettes we make, ( Sometimes the hole in the briquette gets clogged, 
>with pressure and heat the gas accumulated inside the forming cylinder  
>blows up sending the front piece of the briquette to concrete wall. In 
>front of every machine, we have holes in the concrete wall... ). Density 
>of 1 m3 of briquettes are more than 1300 kg.
>Briquettes are much more uniform but harder to make compare to the 
>pellets. We have done gasification with briquettes and also briquette 
>charcoal. Both resulted in very clean gas, specially the briquette 
>charcoal. With the charcoal, must be careful about the heat in the 
>reactor. It goes over 1200 C very fast and makes clingers. They are 
>perfect for steam gasification since the briquette charcoal has over 
>7000 Kcal energy.
>For the price factor, briquettes are exported at $ 175.00 per ton, 
>briquette charcoal is $ 500.00 per ton. It is better to use briquettes 
>for gasification. We have made briquettes using saw dust ( from very 
>light wood to hardest wood dust available) and rice husk. Rise husk is 
>very abrasive and eats the screws very fast.
>I guess for all the people who lives in the woods, or near the woods, it 
>would be better to use the wood chips or chunks. As my experience, 
>uniformity of size is not as important as the dryness of the fuel 
>prepared. We have gasified rice husk and up to 4 x 4 x 5 inches, size 
>wood chunks (in a smaller size gasifier with only 15 cm throat I still 
>can't figure out how they go through the reactor, but they do...) for 
>thermal purposes, results were always good. If your fuel is dried, you 
>will get better quality gas to running engines. Gasifier can be pushed 
>to get more gas for thermal purposes, but to use the gas in the engine, 
>you must really adjust and stay in certain parameters.
>As Bill said, every gasifier is different. You must play and experience 
>with your own gasifier. First get the gas and quantity you need. Than 
>you can play with the reactor design to get a cleaner gas.
>Thanks to everybody sharing their experience and knowledge as much as 
>possible. Every time I built a gasifier and get good quality gas, I 
>thank to many people on and off the list, from my hearth to give me the 
>knowledge and courage to pursue gasification.
>Best wishes to you all...
>Robert Kana, Biomass Indonesia
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