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

Authors :
Kyu Sung Choi
Hong Young Oh
Jong Jin Kim
Sae Byul Kang
Source :
Renewable Energy. 113:1208-1214
Publication Year :
2017
Publisher :
Elsevier BV, 2017.

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, NO x , O 2 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. O 2 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 NO x concentration are 643 and 163 ppm respectively.

Details

ISSN :
09601481
Volume :
113
Database :
OpenAIRE
Journal :
Renewable Energy
Accession number :
edsair.doi...........702e887df41f1442d7faffa0781d468e
Full Text :
https://doi.org/10.1016/j.renene.2017.06.092