| 1. |
- Athanassiadis, Dimitris, et al.
(författare)
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Is there enough primary forest fuel available to feed into the existing and planned CHP facilities? The case of Northern Sweden
- 2010
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Ingår i: Publications / FINBIO. - 1239-4874. ; , s. 77-83
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Konferensbidrag (refereegranskat)abstract
- A combined GIS and optimization method was used to calculate logging residue (slash and stumps) flows and expected costs at the heating or combined heat and power plants (CHP) in Northern Sweden for two logging residue supply chains. Regional primary forest energy availability was estimated considering ecological, technical and economical restrictions. Two supply chains were considered: One supply chain was based on truck transport of the fuel to the CHP plants and the other one was based on collecting the fuel to terminals adjacent to railway lines and transporting it by train to plants that are located in Central Sweden. The costs for each supply chain were calculated based on current costs for harvesting, forwarding, chipping/crushing, machine allocation to the harvesting site, road transport, compensation to the land owner and administration. The lowest cost pathway to the plants was selected. The effects of the establishment of the CHP plants on regional development are discussed
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| 2. |
- Lindroos, Ola, et al.
(författare)
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Productivity of a Prototype Truck-Mounted Logging Residue Bundler and a Road-side Bundling System
- 2010
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Ingår i: Silva Fennica. - : Finnish Society of Forest Science. - 0037-5330 .- 2242-4075. ; 44, s. 547-559
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Tidskriftsartikel (refereegranskat)abstract
- When recovering logging residues (LR) for bioenergy its density should be increased before road transport, otherwise a low proportion of the trucks' load capacity will be used. One way this can be currently done is to compress LR into bundles that are forwarded to roadside landing. A less well-developed alternative is to forward loose LR and bundle it at landing. In the presented study, a prototype specifically developed for road-side bundling was found to produce larger, heavier bundles than bundling machinery intended for in-field use (mean length, diameter and raw bulk density 4.7 m, 0.8 m and 285 kg m(-3), respectively, with 299-445 kg oven dry matter per bundle). The machine was also at least 30% more productive than previously described in-field bundling systems, producing 14-19 bundles per productive work hour (PWh), equivalent to 5.2-7.8 oven-dry tonnes PWh(-1). Bundles were estimated to use 67-86% of an LR truck's 30 tonnes load capacity, similar to proportions used when transporting loose LR. However, a continuous feeding and compressing process would probably almost double productivity, while longer bundles would enable full use of truck load capacity. With such improvements bundling at road-side could provide a viable alternative to current LR-recovering systems.
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