TY - JOUR
T1 - Single large wood log conversion in a stove
T2 - Experiments and modelling
AU - Anca-Couce, Andrés
AU - Caposciutti, Gianluca
AU - Gruber, Thomas
AU - Kelz, Joachim
AU - Bauer, Thomas
AU - Hochenauer, Christoph
AU - Scharler, Robert
PY - 2019/12/1
Y1 - 2019/12/1
N2 - Natural draft wood log stoves for residential bioheat production are very popular due to the low fuel costs, the ecological aspect of a renewable energy source and the visual appeal of the flame. However, they have rather high pollutant emissions, specially of unburnt products. The description of large wood logs conversion in stoves needs to be improved to allow a process optimization which can reduce these emissions. The transient conversion of a single wood log in a stove is experimentally investigated with test runs quenching the log after defined time intervals and measuring the flue gas composition and temperatures in the log and stove. The experiments have been described with a volumetric single particle model, which predicts with good accuracy the log conversion until a time of around 30 min, when pyrolysis is almost ending. At that point, log fragmentation takes place and smaller fragments are detached from the log falling onto the bed of embers. Despite the increase in external surface area, char oxidation takes place at a moderate rate. This last stage of wood log conversion in a stove is the most challenging to model. Finally, preliminary recommendations are provided for reducing CO emissions in wood log stoves.
AB - Natural draft wood log stoves for residential bioheat production are very popular due to the low fuel costs, the ecological aspect of a renewable energy source and the visual appeal of the flame. However, they have rather high pollutant emissions, specially of unburnt products. The description of large wood logs conversion in stoves needs to be improved to allow a process optimization which can reduce these emissions. The transient conversion of a single wood log in a stove is experimentally investigated with test runs quenching the log after defined time intervals and measuring the flue gas composition and temperatures in the log and stove. The experiments have been described with a volumetric single particle model, which predicts with good accuracy the log conversion until a time of around 30 min, when pyrolysis is almost ending. At that point, log fragmentation takes place and smaller fragments are detached from the log falling onto the bed of embers. Despite the increase in external surface area, char oxidation takes place at a moderate rate. This last stage of wood log conversion in a stove is the most challenging to model. Finally, preliminary recommendations are provided for reducing CO emissions in wood log stoves.
KW - Combustion
KW - Experiment
KW - Fragmentation
KW - Stove
KW - Transient model
KW - Wood log
UR - http://www.scopus.com/inward/record.url?scp=85065920250&partnerID=8YFLogxK
U2 - 10.1016/j.renene.2019.05.065
DO - 10.1016/j.renene.2019.05.065
M3 - Article
AN - SCOPUS:85065920250
SN - 0960-1481
VL - 143
SP - 890
EP - 897
JO - Renewable Energy
JF - Renewable Energy
ER -