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Characteristics of spent coffee ground as a fuel and combustion test in a small boiler (6.5 kW)

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  • Kang, Sae Byul
  • Oh, Hong Young
  • Kim, Jong Jin
  • Choi, Kyu Sung

Abstract

Spent Coffee Ground is a residue of coffee drink mainly used at a coffee shop. Spent coffee ground is used as an odor removal, manure in flowerpot and so on. However most of spent coffee ground is discarded as garbage. In this study, we investigated characteristics of spent coffee ground as a fuel and combustion characteristics in a small boiler system (6.5 kW based on input lower heating value), such as CO, NOx, O2 and heating characteristic of heating boiler. Drying of spent coffee ground in the open air condition takes less than 6 days in case of height of 11 mm. More than 96% of spend coffee ground is between 100 and 500 μm in particle size. Lower heating value of spent coffee ground used as fuel is about 18.8 MJ/kg (4500 kcal/kg at water content 10%). Combustion chamber of the boiler is a crucible type with primary and secondary air supply and heat exchanger is one through type. Spent coffee ground consumption as a fuel of the boiler is about 1.17 kg/hr. O2 concentration of the flue gas of the boiler is about 17.8% which is higher than a commercial domestic gas boiler or a domestic wood pellet boiler. CO and NOx concentration are 643 and 163 ppm respectively.

Suggested Citation

  • 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.
  • Handle: RePEc:eee:renene:v:113:y:2017:i:c:p:1208-1214
    DOI: 10.1016/j.renene.2017.06.092
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    References listed on IDEAS

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    Cited by:

    1. Magdalena Dołżyńska & Sławomir Obidziński & Małgorzata Kowczyk-Sadowy & Małgorzata Krasowska, 2019. "Densification and Combustion of Cherry Stones," Energies, MDPI, Open Access Journal, vol. 12(16), pages 1-15, August.
    2. Radovan Nosek & Maw Maw Tun & Dagmar Juchelkova, 2020. "Energy Utilization of Spent Coffee Grounds in the Form of Pellets," Energies, MDPI, Open Access Journal, vol. 13(5), pages 1-8, March.
    3. Mendoza Martinez, Clara Lisseth & Saari, Jussi & Melo, Yara & Cardoso, Marcelo & de Almeida, Gustavo Matheus & Vakkilainen, Esa, 2021. "Evaluation of thermochemical routes for the valorization of solid coffee residues to produce biofuels: A Brazilian case," Renewable and Sustainable Energy Reviews, Elsevier, vol. 137(C).
    4. Anna Brunerová & Hynek Roubík & Milan Brožek & Agus Haryanto & Udin Hasanudin & Dewi Agustina Iryani & David Herák, 2019. "Valorization of Bio-Briquette Fuel by Using Spent Coffee Ground as an External Additive," Energies, MDPI, Open Access Journal, vol. 13(1), pages 1-15, December.
    5. Chen, Ying-Chu & Jhou, Sih-Yu, 2020. "Integrating spent coffee grounds and silver skin as biofuels using torrefaction," Renewable Energy, Elsevier, vol. 148(C), pages 275-283.
    6. Manrique, Raiza & Vásquez, Daniela & Chejne, Farid & Pinzón, Andrea, 2020. "Energy analysis of a proposed hybrid solar–biomass coffee bean drying system," Energy, Elsevier, vol. 202(C).

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