Low energy spent coffee grounds briquetting with organic binders for biomass fuel manufacturing

FUEL

卷:278

Article

Espuelas, S.¹  Marcelino, S.²  Echeverria, A. M.³  del Castillo, J. M.¹  Seco, A.¹ 

[1] Univ Publ Navarra, Inst Smart Cities, Pamplona 31006, Spain

[2] Univ Publ Navarra, Dept Engn, Pamplona 31006, Spain

[3] Zabala Innovat Consulting SA, Mutilva 31192, Spain

关键词: Spent coffee grounds;    Biomass fuel;    Briquette;    Xanthan gum;    Guar gum;   

DOI  :  10.1016/j.fuel.2020.118310

来源: Elsevier

【 摘 要 】

This paper analyzes the ability of the spent coffee grounds (SCG) for briquettes production with xanthan and guar gums as binders. Briquettes were manufactured at room temperature, at 15%, 20%, 25% and 30% of moisture, at 8 MPa, 10 MPa and 12 MPa of compaction pressure and at 5 and 10% of binder dosage. Combination of 10% of xanthan, 15% of moisture, at 12 MPa, reached the highest dry density, 0.819 g/cm(3). The combination of 5% of xanthan, 30% of moisture, compacted at 12 MPa was the most durable with a loss of mass of 3.9%. No relationships were established among water absorption and binder type, binder dosage, manufacturing moisture or compaction pressure. The lowest water absorption value, 0.25%, corresponded to the combination with 5% of xanthan, 30% of moisture, compacted at 10 MPa. The lowest heating value achieved by SCG was 25,399 J/g. Guar 5% and 10% combinations achieved 24,398 J/g and 24,321 J/g respectively. Xanthan gum 5% and 10% dosages attained 24,450 and 23,503 J/g. Binder decreased volatiles, increased fixed carbon content and decreased nitrogen content. Guar gum decreased SCG nitrogen content by 15.92% for the 5% and by 16.92% for the 10% dosage combinations, respectively. Xanthan nitrogen reduction attained 13.43% for the 5% and 14.43% for the 10% of dosage. The raw SCG ash production was 0.66%. This value increased to 0.81% and 0.97% with 5% and 10% of xanthan gum, meanwhile guar decreased it to 0.57% and 0.52%, at 5% and 10% of dosage.

【 授权许可】

Free