Abstract
In Europe, wood combustion in stoves and boilers is widely applied for residential heating. In Germany, approximately 15 million of 40 million households own small-scale furnaces, which deliver 7 % of Germany’s heat consumption. Using state-of-the-art small-scale combustion systems, we investigated how the air quality changes due to the emissions of harmful elements and organic pollutants during the combustion of wood and straw.
Heavy metals: Beside the fuel, we analysed all the originating ashes – grate ash, heat exchanger ash, and fly ash – to reconstruct element fluxes. As the input/output balance calculations show, some elements – such as cadmium, zinc, tin, thallium, lead, bismuth and antimony – may also be retained within the cooler zones of the furnace, in the chimney, or in the refractory lining material where samples could not be taken. Only the elements contained in the filter ash are emitted; at most, these element portions represent 30 % of the amount contained in the fuel.
Organic pollutants: The concentration of organic compounds strongly depends on the fuel type, the furnace and the combustion conditions. The emission of, for instance, polycyclic aromatic hydrocarbons (PAHs; especially Benzo(a)pyrene) can only barely be detected in wood pellet boilers, is more in wood chip furnaces and is more than a factor 100 higher in wood-log-fuelled fireplaces, indicating inappropriate conditions for complete oxidation. This situation is critical, considering that there are now six million wood log fireplaces in Germany.
The pollutants are bound in fine (<1 μm) particles or gaseous compounds and may enter the lungs’ alveoli and contaminate the body. Clearly, effective emission reduction measures are necessary.
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Abbreviations
- CHE:
-
condensing heat exchanger
- CHP plant:
-
combined heat and power plant
- EC:
-
elemental carbon
- ESP:
-
electrostatic precipitator
- ICP-OES:
-
inductively coupled plasma optical emission spectrometer
- ICP-MS:
-
inductively coupled plasma mass spectrometer
- MJ:
-
Megajoule = 106 Joule
- OC:
-
organic carbon
- PAH:
-
polycyclic aromatic hydrocarbon
- PJ:
-
Petajoule = 1015 Joule
- PM:
-
particulate matter
- PM2.5 :
-
particulate matter with a diameter of smaller than 2.5 μm
- SOA:
-
secondary organic aerosol
- TEQ:
-
toxic equivalent
- TSP:
-
total suspended particulate matter (the total of all particles in the air)
- TTC:
-
threshold of toxicological concern
- WSOC:
-
water-soluble organic compounds
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Seidel, T., Orasche, J., Ruppert, H., Schnelle-Kreis, J., Hartmann, H. (2013). Emissions of Organic and Inorganic Pollutants During the Combustion of Wood, Straw and Biogas. In: Ruppert, H., Kappas, M., Ibendorf, J. (eds) Sustainable Bioenergy Production - An Integrated Approach. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-6642-6_13
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