Emissions of polycyclic aromatic hydrocarbons during biomass combustion in a drop tube furnace

The objective of this work is to investigate experimentally the formation of polycyclic aromatic hydrocarbons (PAH) during the combustion of biomass in a drop tube furnace (DTF). A number of biomass fuels, including furniture residues, grape pomace, kiwi residues, olive residues, wheat straw, rice h...

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Bibliographic Details
Published in:Fuel (Guildford) 2017-11, Vol.207, p.790-800
Main Authors: Colom-Díaz, J.M., Alzueta, María U., Fernandes, Ulisses, Costa, Mário
Format: Article
Language:English
Subjects:
Air flow
Biomass
Biomass burning
Carbon dioxide
Combustion
Drop tube furnace
Feed rate
Flow rates
Flow velocity
Flue gas
Fuels
Furnaces
Furniture
Gas chromatography
PAH
Particulate emissions
Particulate matter
Polycyclic aromatic hydrocarbons
Residues
Solid fuels
Soot
Straw
Wheat
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Summary:The objective of this work is to investigate experimentally the formation of polycyclic aromatic hydrocarbons (PAH) during the combustion of biomass in a drop tube furnace (DTF). A number of biomass fuels, including furniture residues, grape pomace, kiwi residues, olive residues, wheat straw, rice husk and platanus residues were used in this work, with the tests performed at three temperatures (900, 1000 and 1100°C). The solid fuels feed rate was 23g/h and the total air flow rate was 4L/min, ensuring a residence time in the DTF of around 2s. In order to collect the PAH in the effluent gas, a narrow tube containing XAD-2 resin was connected to the flue gas duct of the DTF. A quartz fiber filter was placed just before it to collect the particulate matter, including soot, present in the flue gas. The analysis and quantification of the PAH combined Soxhlet extraction and gas chromatograph-mass spectrometer. Flue gas concentrations of O2, CO2, CO, hydrocarbons and NOx were measured to gather information regarding the combustion conditions. The results showed two distinct features for the variation of the total PAH emissions: one decreasing with temperature and other with a maximum at 1000°C. Grape pomace, kiwi residues and platanus residues presented the lowest PAHs emission (20.8–54.2mgPAH/kg fuel). A direct relation between the total amount of PAHs and the toxic equivalency value was found.
ISSN:0016-2361
1873-7153
DOI:10.1016/j.fuel.2017.06.084