Gaseous emissions comparison from agricultural and forest biomass combustion
Authors: Brassard, P, J Palacios, S Godbout, D Bussi
Description: The interest for biomass as a renewable energy source has risen in the last few years because it is a good substitute for the polluting fossil fuels. However, the combustion of biomass is limited in Quebec province due to regulations. In fact, combustion of agricultural biomass in stoves of less than 3 MW is prohibited due to lack of knowledge on gaseous emissions. Combustion in higher output stoves is accepted but with emission limits more stringent than that for wood. The objective of this study was to characterize and compare gaseous and particulate matter (PM) emissions from the combustion of wood, switchgrass, willow and dried solid pig manure (DSPM) in a 60 000 BTU/h (17.58 kW) output pellet stove at three different burning rates. Concentrations of CO2, CO, CH4, NO2, NH3, N2O, SO2, HCl, and H2O were analysed by Fourier transform infrared spectroscopy (FTIR) and converted into emissions on a dry basis at 11% O2 reference value. Opacity was evaluated and PM was sampled with filters inserted into the probe. Results were statistically analysed by the SAS MIXED procedure. SO2 emissions from DSPM and switchgrass were significantly higher than from the wood and willow. NO2 emissions from switchgrass were significantly higher than from the wood. In addition, the PM emissions from DSPM were significantly higher than from the three other biomasses. No more other significant differences were detected (P<0.05). Therefore, further studies should be made so that regulations could be adapted to accept combustion of agricultural biomass in stoves of less than 3 MW.
Keywords: agricultural biomass, combustion, emissions, particulate matter
Technical field: technical_fields_app2
Session name: Building and structures