[Gasification] fasts trees

[AJH]

On Thu, 19 Jul 2007 20:20:21 +0200 (CEST), Javier Bonet wrote:

>if you want to produce a constant amount of wood biomass, from a forest, acording to your expiriences, what could be the best tree,

This will be site variable and dependant on sunshine, rain and soil.
In temperate Europe probably a polar or willow clone, maybe a
eucalyptus in the south will be highest yielders but probably not
"best".


> time to harvest,

This depends on the planting density and species, technically it's
when the current annual increment drops to the mean annual increment.
This will mean around 3 years for willow coppice (spit) to 40 years
for a fast conifer crop.

> and power amount, to achieve the maximun power per unit of land? lets supose cases for producing 20 kw, 100 kw, and 1 Mw of electric power.

There will be big differences in conversion with scaling like this.

You need about 1 dry tonne of wood to produce 1MWhr(e), So for
constant running at 1MW(e) for a year you need 8766 oven dry tonnes
 best yields in UK are around 10 odt/ha/year which suggests about
876.6 ha with a yield class around 35m^3/ha/yr about twice the average
of classic forestry yields.

AJH