Pelletizing trials Autum 2008

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1 Pelletizing trials Autum 2008 Simo Paukkunen NKUAS

2 Raw material Basic information Logging residues from spruce (Picea abies [L.] Karst.) dominant final cuttings, harvested in spring 2008, about 500 kg Whole pines (Pinus sylvestris L.) from first thinning, harvested in spring 2008, about 500 kg Whole birches from first thinnings, harvested in spring 2008, about 1000 kg (was delivered to SLU,Umeå, Sweden) Week 34 the raw material was chipped and packed in Eno (Eno Energy cooperation) and delivered to Saarijärvi (and Umeå) for drying

3 Basic information

4 Drying The raw material was dried in Saarijärvi, Bioenergy-center (Jyväskylä University of Applied Sciences,JUA) Weight and moisture Spruce Before drying: 555 kg, 45 % After drying: 331 kg, 12 % Pine Before drying: 581 kg, 46 % After drying: 348 kg, 15 % About 750 kwh energy was used for drying

5 Pelletizing in Laitila (Lokapelletti LTD) Dry chips were milled by using hammermil (tractor powered, 10 mm sieve) Little problems with sieve

6 Milled material (spruce left, pine right)

7 Pelletizing in Laitila (Lokapelletti LTD) Pelletpress made by Konepaja M. Pappinen Horisontal ring die, 40 mm press kanal, 70 mm die 15 kw electric motor

8 Spruce - pellets

9 Pine pellets

10 Results Spruce Raw material and pellet samples n = 10 Weight, lenght, thickness and hardness from individual pellets n = 50 Pine Raw material and pellet samples n = 12 Weight, lenght, thickness and hardness from individual pellets n = 60 The weight of raw material (spruce) was 208,1 kg/loose-m3 and the weight of pellets (spruce) was 571,7kg/loose-m3. Production was about 210 kg/hour. The weight of raw material (pine) was 206,0 kg/loose-m3 and the weight of pellets (pine) was 547,9 kg/loose-m3. Production was about 170 kg/hour.

11 Results raw material spruce pine temperature of die 81,0 83,8 moisture of raw material, per cent 13,4 14,8 moisture on pellets, per cent 8,9 10,2 weight of pellets, grams 1,93 1,53 lenght of pellets, millimetres 27,51 24,58 thickness of pellets, millimetres 8,72 8,755 hardness of pellets, kp 9,6 9,5 weight of raw material, kg/loose m3 208,1 206,0 weigt of pellets, kg/loose m3 571,7 547,9

12 Concludes Trials went as planned Quality of pellets was not good Now we have goog information for the future Burning trials will be done later autum 2008 in University of Kuopio Next pelletizing trials in autum 2009

13 Small scale pelletizer Pelletpress made by Konepaja M. Pappinen Horisontal ring die, 6 mm, 28 mm press kanal 5 kw electric motor Production about kg/hour

14 Thanks! Simo Paukkunen Yliopistokatu 6, JOENSUU, FINLAND P: Sähköposti:

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