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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

EXPERIMENTAL STUDY OF PM EMISSIONS FROM WOOD PELLET STOVES WITH AN INNOVATIVE BURNING POT

Get access (open in a dialog) DOI: 10.1615/IHTC16.nee.024111
pages 7525-7532

Resumo

Concerns about the greenhouse effects caused by the intense exploitation of fossil fuels are shifting interest towards biomass fuels which have nominally zero-net emissions of greenhouse gases: generation of heat and power from biomass sources is already an important element of the current energy scenario. Unfortunately, a poor exploitation of biomass can cause a significant generation of pollutants and particle emissions. It is generally acknowledged that aerosols are the cause of many diseases and premature death [1, 2], hence the problem of analyzing and reducing aerosols in the air is receiving increasing attention. Within this framework, it is critical to develop more efficient and less polluting devices that use biomass as energy source both for electricity generation and for direct heating of spaces.
In this study, results of an extensive set of experiments on a wood pellet stove model equipped with innovative burning pots are presented. Tests have been performed to investigate the relations between design data and operation parameters of the stove and its emissions. In particular, carbon monoxide (CO) and particulate matter (PM) emissions are correlated to the burning-pot depth.
The burning pot A, adopted by AICO S.p.A, allows to obtain near-to-zero CO emissions and low PM emissions: however, PM emissions reduction with respect to standard burning pots is not as enhanced as CO emission reduction. Here it is shown that a further reduction of PM emissions (down to 6–16 mg/Nm3) can be attained increasing the burning pot depth.
Experiments show also an increment of PM emissions with time during a day of testing: there is an apparent dependence of PM release on the time from ignition. It is likely that this effect is due to ashes accumulation on the bottom of the burning pot and to their interaction with the primary air stream that flows over them.