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Efficiency of Integrated Grinding and Screening of Stump Wood for Fuel at Roadside Landing with a Low-Speed Double-Shaft Grinder and a Star Screen

Juha Laitila ; Natural Resources Institute Finland (Luke) Yliopistokatu 6, FI–80101 Joensuu, FINLAND
Nuutinen Yrjö ; Natural Resources Institute Finland (Luke) Yliopistokatu 6, FI–80101 Joensuu, FINLAND

Puni tekst: engleski, pdf (2 MB) str. 19-32 preuzimanja: 408* citiraj
APA 6th Edition
Laitila, J. i Yrjö, N. (2015). Efficiency of Integrated Grinding and Screening of Stump Wood for Fuel at Roadside Landing with a Low-Speed Double-Shaft Grinder and a Star Screen. Croatian Journal of Forest Engineering, 36 (1), 19-32. Preuzeto s https://hrcak.srce.hr/136124
MLA 8th Edition
Laitila, Juha i Nuutinen Yrjö. "Efficiency of Integrated Grinding and Screening of Stump Wood for Fuel at Roadside Landing with a Low-Speed Double-Shaft Grinder and a Star Screen." Croatian Journal of Forest Engineering, vol. 36, br. 1, 2015, str. 19-32. https://hrcak.srce.hr/136124. Citirano 21.01.2021.
Chicago 17th Edition
Laitila, Juha i Nuutinen Yrjö. "Efficiency of Integrated Grinding and Screening of Stump Wood for Fuel at Roadside Landing with a Low-Speed Double-Shaft Grinder and a Star Screen." Croatian Journal of Forest Engineering 36, br. 1 (2015): 19-32. https://hrcak.srce.hr/136124
Harvard
Laitila, J., i Yrjö, N. (2015). 'Efficiency of Integrated Grinding and Screening of Stump Wood for Fuel at Roadside Landing with a Low-Speed Double-Shaft Grinder and a Star Screen', Croatian Journal of Forest Engineering, 36(1), str. 19-32. Preuzeto s: https://hrcak.srce.hr/136124 (Datum pristupa: 21.01.2021.)
Vancouver
Laitila J, Yrjö N. Efficiency of Integrated Grinding and Screening of Stump Wood for Fuel at Roadside Landing with a Low-Speed Double-Shaft Grinder and a Star Screen. Croatian Journal of Forest Engineering [Internet]. 2015 [pristupljeno 21.01.2021.];36(1):19-32. Dostupno na: https://hrcak.srce.hr/136124
IEEE
J. Laitila i N. Yrjö, "Efficiency of Integrated Grinding and Screening of Stump Wood for Fuel at Roadside Landing with a Low-Speed Double-Shaft Grinder and a Star Screen", Croatian Journal of Forest Engineering, vol.36, br. 1, str. 19-32, 2015. [Online]. Dostupno na: https://hrcak.srce.hr/136124. [Citirano: 21.01.2021.]

Sažetak
Impurities in harvested stumps are a quality problem because high levels of mineral contaminants decrease the effective heating value of the stump wood, and can also affect ash melting behaviour during combustion, leading to sintering and drift problems. The aim of this case study was to clarify the productivity and screening efficiency of the Kompetech Crambo 6000 low-speed double-shaft grinder equipped with a Komptech star screen, in the integrated grinding and screening of Norway spruce and Scots pine stumps for fuel at a roadside landing, when using two different sieve sizes (250 x 320 mm and 180 x 180 mm screen baskets). Furthermore, we studied the fuel consumption of the Crambo 6000 grinder, ash content and particle size distribution of ground stump wood, and ash content and particle size distribution of the screening reject. In addition, the heating value of the produced hog fuel and screening reject were analysed. During the time of the studies, both the grinder and star screen were operating well and there were no delays due to machine breakdowns. The mobile Crambo 6000 grinder was also capable of operating well in constricted roadside landings. The quality of the produced hog fuel was high, due to low ash content (0.4–2.3%), and this highlights the significance of screening to guarantee sufficient quality when processing stump fuel. The ash content of the screening reject was 32.4–74.7%, and the effective heating value was 5.2–13.4 MJ/kg. The effective heating value of the produced hog fuel was 17.9–19.9 MJ/kg. The average grinding productivity, when using the 250 x 320 mm screen basket, was 162 loose m3 per effective hour, and the fuel consumption of the grinder was 0.44 litres per loose m3. With a narrower screen, the average grinding productivity was 101 loose m3 per effective hour, and the fuel consumption of the grinder was 0.75 litres per loose m3.

Ključne riječi
grinding; screening; stump wood; quality; procurement system; buffer-storage; hog fuel

Hrčak ID: 136124

URI
https://hrcak.srce.hr/136124

Posjeta: 627 *