Productivity of Stump Harvesting for Fuel

Laitila, Juha; Ranta, T.; Asikainen, Antti

doi:10.1080/14942119.2008.10702566

Cited by 37 publications

(52 citation statements)

References 6 publications

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“…The results of the present study largely agree with those of Laitila et al (2008) and Kärhä & Mutikainen (2009), especially concerning the amount of productive time spent in different activities. Splitting stumps and shaking off impurities (SPLIT), and stump piling (PILE) proved to be the most time consuming work elements with the widest spread of values around the means (Table 4).…”

Section: Discussionsupporting

confidence: 81%

“…However, for a stump with a 55 cm DSH, our model predicts 14 % less time consumption than the 178 seconds in Laitila et al's model. It should be noted, however, that the function described by Laitila et al (2008) also included the time taken to smooth the holes, although that operation only accounted for 3 % of the processing time.…”

Section: Discussionmentioning

confidence: 99%

“…The productivity function for spruce proposed by Laitila et al (2008), indicates that the 17-tonnes excavator with the fork-like stump-lifting tool used in that study, needed less time to process stumps up to 47 cm diameter, and more time for stumps with diameters greater than 47 cm. For instance, according to Laitila et al, 51 seconds are required to process a stump with a DSH of 35 cm, which is 40 % less than the time it would take according to the productivity function determined in the present study.…”

Section: Discussionmentioning

confidence: 99%

“…The stumps are then shaken to remove most of the attached soil and stones, and piled for subsequent transport to the roadside and on to the receiving plant. As only one scientific paper (Laitila et al 2008) and some conference contributions (Kärhä & Mutikainen 2009;Lazdinš et al 2009;Jouhiaho et al 2010) have appeared presenting recent time studies on stumpwood harvesting there is a need for further research in order to get a better understanding on the factors that have an impact on the productivity of stumpwood harvesting operations.…”

Section: Introductionmentioning

confidence: 99%

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Pine and spruce stump harvesting productivity and costs using a Pallari KH 160 stump-lifting tool

Athanassiadis

Lindroos

Nordfjell

2011

Scandinavian Journal of Forest Research

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Even though stumpwood may become a significant part of the future fuel mix for combined heat and power plants in Sweden the harvesting of stumps after regeneration fellings is still only performed on a trial basis. Results from time studies on two, 23 tonne, excavators fitted for stump lifting; together with followup data on stump lifting and forwarding are presented. Lifting, splitting and piling the stumps accounted for 17 %, 32 % and 32 %, respectively, of the total productive work time. A predictive model was developed to estimate operational times and productivities when lifting pine and spruce stumps. Stump diameter, species and terrain conditions contributed significantly to the fit of the model. The model predicts that productivity of stump lifting in spruce sites with easy terrain conditions and average stump diameters of 20 and 40 cm will be 1.23 and 4.19 oven-dry tonnes (ODT) per productive work hour respectively. This is 43% higher than in pine sites with difficult terrain conditions and the same diameters. In the follow-up data the productivity in stump lifting varied from 1.5 to 2.9 ODT per productive work hour while the cost for lifting and extraction to roadside varied from 37.8 to 59.4 € per ODT.

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Section: Discussionsupporting

confidence: 81%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Pine and spruce stump harvesting productivity and costs using a Pallari KH 160 stump-lifting tool

Athanassiadis

Lindroos

Nordfjell

2011

Scandinavian Journal of Forest Research

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“…Lifting the stumps left in the soil is one of the most energy demanding forest operations (Laitika et al 2008;Kärhä, Mutikainen 2009). Szepesi (1966) estimated the force required for stump extraction, based on the weight below the cutting plane, the branching roots and the texture of various soils, as several hundred thousand Newton.…”

Section: Methodsmentioning

confidence: 99%

Vertical force requirement for stump lifting

Czupy¹,

Horváth-Szováti²

2013

J. For. Sci.

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ABSTRACT:In harvest areas the soil preparation is occasionally necessary before reforestation including the removal, collection and transportation of stumps from the soil. Issues related to climate change and the shortage of fossil energy sources call for an increased rate of renewable energy sources. Using the stumps removed from the soil as fuel is a significant resource for biomass. For lifting a stump together with its roots a grab mounted on a shovel is generally used. To rationalise this operation, analyses of stump lifting time have been carried out. We tested a machine mounting one grab for stump lifting on three tree types (Scots pine, robinia and poplar) and found functions correlating stump extraction force and stump diameter, which can be used in order to choose the right machine and determine the cost of the operation.

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Forest Energy Procurement: State of The Art In Finland And Sweden

Routa¹,

Asikainen²,

Björheden³

et al. 2015

Advances in Bioenergy

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The EU should produce 20% of their energy from renewable sources, including bioenergy, by 2020. Each member state has their own target, for example, Finland should produce 38% and Sweden 49% of their energy from renewable sources by 2020. In this context, the development of forest energy utilization and more effective and economic supply systems plays an important role in both countries. The Nordic countries are the world leaders in the utilization of forest biomass for energy production. This paper provides a short overview of the driving forces behind the current technical solutions of forest energy procurement systems in Finland and Sweden and some perspectives on possible future developments. At the moment, the by‐products from forest industries (e.g., sawdust, black liquor) have a high degree of utilization in both countries. Additional raw materials for energy production include logging residues, stump and root wood, small diameter wood, and other wood not in demand by the traditional forest industries. Forest energy supply chains may be characterized based on the location of comminution into roadside comminution, terminal comminution, or comminution at a plant. The productivity of the generally highly sophisticated and costly procurement machinery is, to a large extent, dependent on the operator's skills and thus new technological solutions should be developed to improve their usability and consequently efficiency. This article is categorized under: Bioenergy > Economics and Policy

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Productivity of Stump Harvesting for Fuel

Cited by 37 publications

References 6 publications

Pine and spruce stump harvesting productivity and costs using a Pallari KH 160 stump-lifting tool

Pine and spruce stump harvesting productivity and costs using a Pallari KH 160 stump-lifting tool

Vertical force requirement for stump lifting

Forest Energy Procurement: State of The Art In Finland And Sweden

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