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Spent coffee grounds and wood co-firing: Fuel preparation, properties, thermal decomposition, and emissions

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  • Lachman, Jakub
  • Lisý, Martin
  • Baláš, Marek
  • Matúš, Miloš
  • Lisá, Hana
  • Milčák, Pavel

Abstract

Spent coffee grounds (SCG) is the byproduct of coffee preparation. With coffee being one of world's most traded commodities, the question of SCG utilization is naturally raised. Among the proposed and tried methods, direct co-firing with wood or other materials is still perceived as the method most local SCG producers could easily incorporate into a waste-to-energy supply chain for circular economy. This study thus delved into assessing the technical feasibility of SCG and wood co-firing. As part of the research, a thorough investigation into fuel properties, pelleting, boiler performance and emissions was conducted. A possible antagonistic behavior between SCG and wood was observed during thermogravimetric analysis and the subsequent emission tests. The thermogravimetric analysis also showed negligible difference in thermal decomposition of SCG from different places of origin. The mechanical durability of wood/SCG pellets was found to be significantly reduced by SCG, and the pellets would not meet the EN ISO 17255 requirements in any of the tested ratios. Compared to wood, the NO emissions were significantly higher when firing the SCG-containing pellets. However, no direct correlation was found between the NO concentrations and the amount of SCG in the blends, thus hinting at other factors affecting the NO formation.

Suggested Citation

  • Lachman, Jakub & Lisý, Martin & Baláš, Marek & Matúš, Miloš & Lisá, Hana & Milčák, Pavel, 2022. "Spent coffee grounds and wood co-firing: Fuel preparation, properties, thermal decomposition, and emissions," Renewable Energy, Elsevier, vol. 193(C), pages 464-474.
    • Handle: RePEc:eee:renene:v:193:y:2022:i:c:p:464-474
    DOI: 10.1016/j.renene.2022.05.003
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    References listed on IDEAS

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    1. Plaza, M.G. & González, A.S. & Pevida, C. & Pis, J.J. & Rubiera, F., 2012. "Valorisation of spent coffee grounds as CO2 adsorbents for postcombustion capture applications," Applied Energy, Elsevier, vol. 99(C), pages 272-279.
    2. Lisowski, Aleksander & Olendzki, Dariusz & Świętochowski, Adam & Dąbrowska, Magdalena & Mieszkalski, Leszek & Ostrowska-Ligęza, Ewa & Stasiak, Mateusz & Klonowski, Jacek & Piątek, Michał, 2019. "Spent coffee grounds compaction process: Its effects on the strength properties of biofuel pellets," Renewable Energy, Elsevier, vol. 142(C), pages 173-183.
    3. Kang, Sae Byul & Oh, Hong Young & Kim, Jong Jin & Choi, Kyu Sung, 2017. "Characteristics of spent coffee ground as a fuel and combustion test in a small boiler (6.5 kW)," Renewable Energy, Elsevier, vol. 113(C), pages 1208-1214.
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    1. Ghorashi, Seyed Amin & Khandelwal, Bhupendra, 2023. "Toward the ultra-clean and highly efficient biomass-fired heaters. A review," Renewable Energy, Elsevier, vol. 205(C), pages 631-647.

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