Pelleting torrefied biomass at pilot-scale - Quality and implications for co-firing

RENEWABLE ENERGY

卷:178

Article

Agar, David A.¹  Rudolfsson, Magnus¹  Lavergne, Simon^2,6  Melkior, Thierry³  Perez, Denilson Da Silva⁴  Dupont, Capucine⁵  Campargue, Matthieu²  Kalen, Gunnar¹  Larsson, Sylvia H.¹ 

[1] Swedish Univ Agr Sci, Dept Forest Biomat & Technol, SE-90183 Umea, Sweden

[2] Lab RAGT Energie, Chemin La Teuliere, F-81000 Albi, France

[3] Univ Grenoble Alpes, DTBH, CEA LITEN, 17 Ave Martyrs, F-38054 Grenoble 09, France

[4] FCBA, 10 Rue Galilee, F-77420 Champs Sur Marne, France

[5] IHE Delft Inst Water Educ, Dept Water Supply Sanitat & Environm Engn, Delft, Netherlands

[6] Bioenergy Europe, Pl Champ Mars 2, B-1050 Brussels, Belgium

关键词: Torrefaction;    Durability;    Energy density;    Densification;    Pelletization;    Bio-coal;   

DOI  :  10.1016/j.renene.2021.06.094

来源: Elsevier

【 摘 要 】

The co-firing of solid biofuels in coal plants is an attractive and fast-track means of cutting emissions but its potential is linked to biomass densification. For torrefied materials this topic is under-represented in literature. This pilot-scale (121-203 kg h(-1)) pelleting study generated detailed knowledge on the densification of torrefied biomass compared to untreated biomass. Four feedstock with high supply availability (beech, poplar, wheat straw and corn cob) were studied in their untreated and torrefied forms. Systematic methods were used to produce 180 batches of 8 mm dia. pellets using press channel length (PCL) and moisture content (MC) ranges of 30-60 mm and 7.3-16.6% (wet basis) respectively. Analysis showed that moderate degrees of torrefaction (250-280 degrees C, 20-75 min) strongly affected pelleting behaviour. The highest quality black pellets had a mechanical durability and bulk density range of 87.5-98.7% and 662-697 kg m(-3) respectively. Pelleting energy using torrefied feedstock varied from -15 to +53 kWh t(-1) from untreated with increases in production fines. Optimal pelleting MC and PCL were reduced significantly for torrefied feedstock and pellet quality was characterised by a decrease in mechanical durability and an increase in bulk density. Energy densities of 11.9-13.2 GJ m(-3) (as received) were obtained. (C) 2021 The Authors. Published by Elsevier Ltd.

【 授权许可】

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