Kelly,
The short answer is; I don't know.
I've found that logs moved with a forwarder are cleaner than a stem
moved with a cable skidder. So this bundling scheme should reduce the
amount of foreign matter, assuming that the bundles are moved with a
forwarder. Also, the wood bundled would be picked where it was fell so
lessing the problem. The furry critters should attend the morning crew
safety meeting.
Cheers,
Jeff
On 09/08/2014 09:51 AM, Kelly Burnham wrote:
Jeff,
How is the separation of foreign matter (sand, rocks, furry critters)
handled in the bundling process?
Kelly
On Sep 6, 2014 5:30 PM, "Jeff Davis" <[email protected]
<mailto:[email protected]>> wrote:
One recent innovation involves the compaction of logging residues
into cylindrical bales called composite residue logs (CRL) or
biomass bundles (Johansson et al, 2006). CRLs are approximately 24
inches in diameter (61cm) and 10 feet (3m) long.
https://www.youtube.com/watch?v=XZOoHUEgf8w
One of the most appealing aspects of CRL is, they can be handled
similarly to round logs. Bundles are efficiently handled and
transported with conventional equipment used for roundwood. Simple
modification to the trailer may be required depending upon CRL
length and makeup. The 1490D Slash Bundler can produce 18 to 26
bundles per hour. Cost to bundle at the logging deck is
approximately $11 to $14 per green ton. Total cost of operations
to gather, bundle and deliver is $21 to $25 per green ton. A blend
of pine and hardwood offers best economic advantages due to the
amount of available material on ground, relative ease of handling
and energy content. The calorific heat content has been measured
at 10 MJ per green kg (4300 Btu per green lb) and an energy
density of 4.5 GJ per m3. By comparison, calorific heat content of
oven dry bundles yield 19.7 MJ per ovendry kg (8500 Btu per lb).
Slash bundling offers superior storing characteristics. Private
data shows that seasoning bundles (storing) for 11 months reduces
moisture content to 25 percent to 30 percent and increase energy
value to 17.2 MJ per kg (7400 Btu per pound). The post-seasoned
delivered cost is $
14.50 per ton. To date, approximately 67,280
m3 have been bundled from 15 sites in East Texas. The best
comminution option appears to be horizontal grinders at a
terminal. Grinders accept bundles easily and costs are minimized.
Independent data show a 65-percent reduction in grinding costs,
using a 1,500 horsepower electric motor from parasitic load of the
electric power plant for which the bundles are serving.
http://www.extension.org/pages/26530/bundling-woody-biomass
Cheers,
Jeff
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