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1

Logging mechanisation in the Czech Republic

100%
Gross J.
Annals of Warsaw University of Life Sciences - SGGW. Agriculture
|
2009
|
nr 53 Agric.Forest Eng.
63-66
2

Efficiency and technical parameters of the crushing of logging residues with a Meri Crusher MJS-2.0 DT machine

86%
Rozanski H., Jablonski K.
Acta Scientiarum Polonorum. Silvarum Colendarum Ratio et Industria Lignaria
|
2008
|
tom 07
|
nr 1
The crushing of the logging residues was carried out on a forest area, on a mixed fresh coniferous site (BMśw). The weight of the logging residues which were left behind on the clear cut area, after taking away the round wood assortments was 47 t. The object of the analysis was a Meri Crusher MJS-2.0 DT crushing machine powered by a Valtra T-190 tractor. The crusher was 2000 mm wide and the power of the tractor was 190 HP. During the analysis the quantity of the biomass to be milled and the productivity of the milling operation itself were determined. Based on given technical parameters of the crusher (the rpm of the PTO, number of cutters, diameter of the drum and the driving speed of the tractor), the rpm of the working drum, the linear velocity of the cutters, the power and torque of the working drum and the productivity of milling were determined. Based on the analysis of working movements of the machine, the total force on all the cutters as well as the average force per one cutter were calculated. It was found that the average force on one cutter was 770 N.
3

Physical and chemical properties of pine wood chips produced from logging residues

86%
Jablonski K., Rozanski H.
Acta Scientiarum Polonorum. Silvarum Colendarum Ratio et Industria Lignaria
|
2009
|
tom 08
|
nr 2
The paper presents research results into quantities of branches and tree tops forming logging residues as well as the calorific value, moisture and ash contents of chips burned in a fluidal boiler. The results showed that logging residues make up 17% of the above ground tree biomass, which gives about 52.8 t/ha. The calorific value of the wood chips was 7.8 MJ/kg for fresh material, 12.9 MJ/kg for chips after 4 month storage time and 16.2 MJ/kg after storing the chips for 8 months. The ash from chips burned in a boiler with a fluidised bed contained 62% of silicon dioxide, resulting from the filling role of sand in the fluidal bed. The share of CaO was 6%, MgO – 2.8% and N2O – 0.4%.
4

Energy consumption in the production of chips and bundles from logging residues

86%
Rozanski H., Jablonski K.
Acta Scientiarum Polonorum. Silvarum Colendarum Ratio et Industria Lignaria
|
2010
|
tom 09
|
nr 2
25-30
The paper presents an analysis of energy consumption values for two machine energy wood harvesting technologies. Both technologies were used to produce woody fuels from logging residues, one focused on chipping and the other on bundling logging residues. The energy analysis comprised the built-in energy in the machines used, the energy contents of the fuels used and physical loads of machine operators. The energy contained in the fuels used by the machines dominated and its share in the total consumption reached 75%. The analysis of energy consumed in different technological operations showed, that the hauling of chips and bundles (50 km) were most energy consuming, and the energy consumption value reached 100 MJ/m3. Both energy wood harvesting technologies, in which wood chips as well as bundles were produced, showed similar energy consumption values, which amounted to about 196 MJ per 1 m3 of woody fuels.
5

Mechanics of the milling of logging residues with a Meri Crusher MJS-2.5 DT machine

86%
Rozanski H., Kujawski M., Jablonski K.
Acta Scientiarum Polonorum. Silvarum Colendarum Ratio et Industria Lignaria
|
2006
|
tom 05
|
nr 2
6

Elements of the theory of crushing in breaking up logging residues

86%
Rozanski H., Jablonski K.
Forestry
|
2001
|
tom 04
7

Economic effectiveness of logging residue bundling and chipping

72%
Rozanski H., Jablonski K.
Acta Scientiarum Polonorum. Silvarum Colendarum Ratio et Industria Lignaria
|
2009
|
tom 08
|
nr 2
The paper contains research results into the time consumption and costs of fuel woody biomass production, in the form of bundles and chips from logging residues. The tests were conducted in adult pine stands and machine technologies for wood harvesting and extraction were used. The share of logging residues in the total tree biomass was assessed based on measurements carried out on three experimental plots in adult pine stands. The costs calculations contained fixed and variable cost categories. The share of the woody biomass which forms logging residues in the total above-ground tree biomass was 15%. The time consumptions of the energy wood harvesting, using machine technologies, were 0.447 h/m3 for wood chips and 0.481 h/m3 for residue bundles, and the costs amounted to 53 PLN/m3 and 70 PLN/m3, respectively.
8

The analysis of the volume of logging residue in final fellings in pine stands

72%
Chlebowski K.
Acta Scientiarum Polonorum. Silvarum Colendarum Ratio et Industria Lignaria
|
2007
|
tom 06
|
nr 4
The aim of the work was to determine which part of biomass remains in the forest in the form of so-called logging residue. In order to achieve the result, the analysis of wood volume harvested in the final felling was carried out, and the total volume was broken down into different parts of trees. Furthermore, to estimate the wood volume of the forest stand, on each of the experimental plots 10 model trees were chosen based on Draudt method. Assuming that the thickness of wood acquired from forest is bigger than 4 cm, it is possible to assume that the part of biomass which remains in the forest in the form of the branches and conifer needles ranges from 10% to 12% of general amount of biomass.
9

Economic effectiveness of crushing logging residues with a Meri Crusher MJS-2.5 DT with a farm tractor Valtra T-190

72%
Rozanski H., Jablonski K.
Zeszyty Naukowe Akademii Rolniczej w Krakowie. Sesja Naukowa
|
2005
|
tom 91
75-81
10

Crushing logging residues with Meri Crusher MJ-2.3 ST and MJ-2.3 DT machines

72%
Rozanski H., Jablonski K.
Forestry
|
2002
|
tom 05
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