Abstract
Wood firings usually show high concentrations of unburnt emissions during the start up and shut down periods. Since the range of flue gas can vary widely the common method to measure the emissions of wood firings considers only the concentration of pollutants during the stationary period of the combustion. In this period a constant flow of flue gas can be assumed.
The aim of the presented project is to develop a method to measure the integrated amount of pollutants during a whole batch for wood firings with a power output in the range of 20-70 kW. Therefore, the concentrations of CO, CO2, O2 and NOx are analysed and the flue gas velocity is continuously measured to calculate the instantaneous mass flow of the emissions of CO or other pollutants. The mass flow of CO is integrated over a whole batch and then divided by the total energy input during the batch to get an integrated emission value in mg/MJ. The energy input can either be calculated by the flue gas composition or by the weight and the humidity of the wood.
During the start and shut down periods the flue gas flow cannot be measured in a common chimney because the gas velocity is small and the flow field is not properly defined. In the presented method the velocity is measured in a small diameter tube. The pressure drop in the measuring tube is corrected and the influence of the chimney is simulated by computer controlled ventilation.
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References
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© 1993 Springer Science+Business Media Dordrecht
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Nussbaumer, T., Wagner, D. (1993). A New Method to Measure the Integrated Amount of Pollutants from Nonstationary Wood Combustion Processes. In: Bridgwater, A.V. (eds) Advances in Thermochemical Biomass Conversion. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-1336-6_43
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DOI: https://doi.org/10.1007/978-94-011-1336-6_43
Publisher Name: Springer, Dordrecht
Print ISBN: 978-94-010-4582-7
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