[Gasification] Composite Residue Logs

Kelly Burnham kburnham at protonpowerbioenergy.com
Mon Sep 8 08:51:31 CDT 2014


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" <jeffdavis0124 at gmail.com> 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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