[Stoves] Biomass Cooking Stoves Site in Back Online /Torrefied wood

[adam u partner]

Paul S. Anderson schrieb:

I have some comments on the torrefied wood:
I do not think torrefied leaves, wood chips can be
pelleted by a extruder without binder, because in the wood
pellets which are produced by an extruder
needs to have a certain humidity so the pellets stick together
just by the pressure of the extruder.
So i guess to make pellets from crashed torrefied  leaves,
wood chips you need  water + binder (starch etc.)?

Otherwise the mystery of torrefied wood is very simple,
its just the stage of the very dry wood you see in an open fire,
the stage of the wood between being wet and charcoal black.
The advantage of torrefied wood:

* ignites easy,
* gives only  little smoke from the starting
*  it is claimed that it does not get wet again (can not
absorb water again)
* and its more light (0% water content) than sun-dry wood.
* Has a superb energy value per weight

To make torrefied wood is much easier than to make charcoal,
actually when i produced charcoal in the "low-cost retort kiln" it
"failed" once a while and we received "torrefied wood" because
we did not heat the retort long enough.
best
Chris ADAM

>
>
> Torrefying!!!!   Please explain HOW MUCH torrification is needed to do 
> what you
> describe below.  You are saying that you take waste biomass like sugarcane
> leaves and create some "torrified intermediate biomass" (which would have very
> low moisture).  Please tell about the amount of heat, time in the "torrifier",
> type(s) of torrifiers, etc.
>
> Then you are making the torrified biomass into briquettes.  How are you making
> the briquettes (amount of pressure, type of press, etc)?  What makes the
> materials stick together?  What sizes are you able to make?  (I would like
> about 2 to 3 cm diameter and 2 to 5 cm length.)  THAT briquette made from
> torrified biomass still has most of its hydrocarbons intact, so, as you 
> say, it
> will burn/pyrolyze/act-like-woody-fuel.  Yes, Yes, YES!!!  That should be a
> great fuel for the TLUDs!!! (Might also be good for other stoves as well if
> they can operate with the "chunky" types of fuels).  The gasifiers excel with
> the chunky fuels!!!   And you get the charcoal!!   Is the charcoal coming out
> in well-shaped pieces (miniatures of the briquettes??).  Or is the char loose
> and flaky?
>
> The bottom line is, how much effort and heat is needed to make the torrified
> biomass, and then to make the briquettes?  If the waste heat from "stoves"
> (what goes up the chimney) can be used to do most of the torrification, 
> then we
> really have a low-cost way to make true-waste biomass into something 
> that can be
> made into briquettes that have good value.
>
> I look forward to your reply, and to seeing you at PCIA.  I hope that Dr.
> Shreedhar from Indian Institute of Science will also be there to tell more
> about torrification.
>
> Paul    (below is your key comment)
>
>   
>> After his lecture, I conducted an
>> experiment with the help of the trainees to torrefy leaves with the
>> oven-and-retorts  kiln that was constructed in Pak Chong as a demonstration
>> model. Leaf litter collected from underneath the local trees could be
>> torrefied very easily by using my kiln and the torrefied material could also
>> be easily extruded into briquettes. The briquettes burned like wood with a
>> tall flame and they also produced smoke, but this process opens up the
>> possibility of converting dry leaves of sugarcane and other agricultural
>> waste into fuel that can be used in a T-LUD type of stove. The residue can
>> still be used as charcoal.
>> Yours
>> A.D.Karve
>> --
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