Characterization of coffee residues pellets and their performance in a residential combustor |
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Authors: | Mejdi Jeguirim Lionel Limousy Eric Fossard |
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Affiliation: | 1. Institut de Science des Matériaux de Mulhouse, UMR 7361 CNRS, Mulhouse, France;2. RID Solution, Theix, France |
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Abstract: | Spent coffee grounds (SCG) and coffee husks (CH) were evaluated as biofuels, after densification, for energy production. CH represent a specific problem for the coffee industry due to a low calorific value, high ash content, and a very low bulk density. Hence, the energetic potential of SCG (95 wt%)/CH (5 wt%) blend and pure SCG (100%) were examined. The blend of SCG and CH was limited to 5 wt% of CH because of the low bulk density of CH. Therefore, physicochemical and energetic characterizations of the produced pellets were performed. Thermogravimetric analyses were performed under nitrogen and air atmospheres to evaluate the CH behavior in the blend. Characterization study shows that both produced pellets could reach the French Agropellets standard (AQI). Thermal degradation showed that the mean reactivity of the SCG/HC pellets was higher than pure SCG. Then, combustion experiments were performed in a domestic combustor, after modification of the boiler power in order to improve its energetic performances. The presence of CH led to a rise of CO, NOx, VOC’s, and particle emissions. Nevertheless, the performances of the biofuels are almost in agreement the NF EN 12809 standard. |
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Keywords: | Coffee husks combustion domestic boiler pellets spent coffee grounds thermal characterization |
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