Title:
Combustion of Wood Briquettes in Stoves
Author(s):
Schön, C., Hartmann, H.
Document(s):
Paper
Abstract:
Increased wood fuel demand for households and new European biomass fuel standards have stimulated a growing use of wood briquettes in Europe. But concerning their pollutant emissions when applied in residential stoves there is contradictory information about possible improvements compared to regular wood logs. Influencing factors are given by the raw material used, briquette shape and fuel composition. For combustion trials several such fuels were selected: four wood briquettes of different shapes (cylindrical, cylindrical with hole, cubiform and eight edged with hole), two briquettes made of pure bark, one briquette of brown coal and as reference fuel wood logs from beech and spruce. All fuels were consistently applied in three different stoves (two chimney stoves of 6 and 8 kW and one tiled stove insert of 8 kW) representing the state of the art in Germany. The results show that the combustion of wood briquettes usually causes higher particle emission compared to log wood, but briquettes perform quite comparable to wood logs when regarding carbon monoxide (CO-) and organic gaseous carbon (OGC)-emissions. Round briquettes with and without central hole were found favourable types. Pure bark briquettes were found less suitable due to increasing CO and OGC emission and due to higher particle emissions when sampled from diluted flue gas at temperatures below 50°C. For bark and coal briquettes the thermal efficiency is about 10 % lower compared to log wood or pure wood briquettes.
Keywords:
particle emissions, chimney stove, tiled stove insert, wood briquettes, bark briquettes
Topic:
R&D on Biomass Conversion Technologies for Heating, Electricity and Chemicals
Subtopic:
Solid biofuel combustion for small and medium scale applications
Event:
20th European Biomass Conference and Exhibition
Session:
2CV.4.13
Pages:
1286 - 1292
ISBN:
978-88-89407-54-7
Paper DOI:
10.5071/20thEUBCE2012-2CV.4.13
Price:
FREE
