[Gasification] Biofiber drying quantification

[Benjamin Domingo Bof]

Tom ; thank you very much for your answer and comments. Probably the future for gasification science and construction is to dry many bio materails. This way processes are less expensive due to low trasport costs. In drying process also could be generated by products. Doctor Thomas B. Reed about fire sciencetell  we need to deep our researchs. I agree. We must study many phenomenae about fine particles heat tyransmission processes.Do you remeber Tyndall effect with light?.I wish if you have web address of BTG in Netherlands and photos about Martezo and its container.
 Regards; Benjamin

Tom Miles <tmiles at trmiles.com> escribió: Benjamin, I think there is a used Martezo gasifier sitting in a container at
BTG in the Netherlands if you want one. 

Norma,
You'll be lucky to mechanically dewater the solids below about 50% MC on a
consistent basis. They have a high water holding capacity which is what
makes them such a good compost. Add char (from the Martezo gasifier) to the
solids and compost them to rebuild the soil (see
http://terrapreta.bioenergylists.org/). The high surface area and high
moisture also makes it difficult to release the moisture with just heating.
High velocity air enhances drying above 40% MC. The most practical dryers
are still rotary drum dryers with high recirculation to reduce exhaust, VOC
emissions and dryer fires. For small scale systems you can use batch or belt
dryers.    

Some indirect steam heating is now used for drying distillers grains and
solubles (DGS) which is similar in characteristics to your solids. It is
best used in combination with air drying. There a few commercial dryers of
this kind. Some are supplied by the ethanol plant suppliers. See the
Rosinaire http://www.barr-rosin.com/products/rosinaire-paddle-dryer.asp some
heat transfer coefficients are cited in their literature. 

Superheated steam drying is also effective for finely divided solids. (see
Exergy Steam Drying http://www.barr-rosin.com/commonpdfs/exergybrochure.pdf)
However I understand that they have had problems feeding light solids into
these dryers.

Tom


Tom         


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