Forschungs- & Entwicklungsinformationsdienst der Gemeinschaft - CORDIS

WP(8) Energy analysis of energy wood production

The aim of this part of the work is to make an energy analysis of energy wood production and utilisation. Energy wood chains concerning logging residue recovery are used as a working examples. Templates for information gathering and a checklist for calculations are included. These examples could be used as bases for further comparison between different supply chains for energy wood in different countries.

These methodological aspects and findings are used for further analysis of energy wood supply systems within the ECHAINE project. The analysis is made taking into account the direct energy use (diesel fuel and electricity for raw material handling). Three (3) supply system are chosen for the analysis.

These supply systems are:
A) Bundles of logging residues,
B) Wood chips of logging residues,
C)Loose logging residues.

Differences in direct energy consumption and EROI between the supply chains A, B and C were detected. The difference was between 7-17%.

The production chain A (Bundles of logging residues) was found more energy efficient than production chains B (Wood chips of logging residues) and C (Loose logging residues) when considering the direct energy use. The calculated energy return of investment (based on direct energy use) was at the level of 43 – 50 (A = 50, B = 47, and C = 43).

Key innovative features of the result:
- Only about 2,0 - 2,5% of the total energy output is used by the production chains (used as direct fossil fuel or electricity), when considering utilisation of logging residues in Scandinavian conditions (i.e. in Sweden and Finland).
- The results from an energy analysis could also be used to point out energy intensive / energy consuming parts of the production chain, i.e. to give valuable information about the technical development needs.

Use potential:
The following conclusions could be made from the presented study:
- The production chain A (Bundles of logging residues) is an energy efficient chain due to high density of the bundles. This fact makes it possible to maximise the load capacity of the machines.
- The production chain B (Wood chips of logging residues) takes a middle position. It is less energy efficient that the chain A but it is more efficient than the chain C (Loose logging residues.
- The production chain C (Loose logging residues) is an energy consuming operation there almost all parts of the chain are energy consuming. The main reason to that is the low density of logging residues, which makes the chain operations less energy efficient.
- Crushing is an efficient way to comminute the material (both loose residues and bundles). Road transport without return transport is an energy consuming operation. There is a need for better logistic planning to avoid such empty transports.

Expected benefits:
- The energy wood production chains and heat and power production using energy wood are evaluated by the means of energy input / output, i.e. in the terms of energy return investment (EROI).
- This analysis method means that all activities (generated by the nature and humans) can be translated to energy units.
- Using an accounting / calculation method the supply chain activities are calculated using this measurement unit.
- The sum of all the necessary activities for a chain representing, e.g., energy wood utilisation for heat and power purposes is calculated.
- This method is often used as an additional evaluation method to traditional analysis methods, e.g. economic analysis.

Dissemination: Dissemination of the results have been carried out by: 1) Presention of the deliverables at the Echaine web-page, 2) Partners presentations at two by Echaine consortium arranged international workshops (Bulgaria and Russia), 3) Partners presentations at several national and international seminars and workshops, 4) Scientific papers.

Verwandte Informationen

Reported by

SLU, Dep. of Bioenergy
Vallvaegen 10
75007 Uppsala
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