Holes in the concrete wall? now THAT is impressive! Very interesting and enlightening contribution. Thanks, Robert!
>-----Original Message----- >From: Robert Kana [mailto:[email protected]] >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 > >_______________________________________________ >Gasification mailing list > >to Send a Message to the list, use the email address >[email protected] > >to UNSUBSCRIBE or Change your List Settings use the web page >http://lists.bioenergylists.org/mailman/listinfo/gasification_lists.bioenergylists.org > >for more Gasifiers, News and Information see our web site: >http://gasifiers.bioenergylists.org/ > _______________________________________________ Gasification mailing list to Send a Message to the list, use the email address [email protected] to UNSUBSCRIBE or Change your List Settings use the web page http://lists.bioenergylists.org/mailman/listinfo/gasification_lists.bioenergylists.org for more Gasifiers, News and Information see our web site: http://gasifiers.bioenergylists.org/
