Effect of additives on emissions and ash-related problems from small-scale combustion of reed canary grass
Authors: Fournel, S., J. Palacios, S. Godbout, M. Heitz
Description: Agricultural producers are interested in using biomass available on farms to substitute fossil fuels for heat production. However, agricultural residues and energy crops contain high nitrogen (N), sulfur (S), chlorine (Cl), potassium (K), silicon (Si) and other ash-forming elements which lead to increased emissions of particulate matter (PM), nitrogen oxides (NOx), sulfur oxides (SOx) and hydrogen chloride (HCl) and ash-related problems (sintering, slagging, fouling and corrosion). One possibility to address these problematic behaviours is the application of fuel additives such as aluminium-silicates based additives (e.g. kaolin), calcium based additives (e.g. limestone) and sulfur based additives (e.g. magnesium lignosulfonate) with strong chemical adsorption and reaction capacities. Another option is to mix agricultural products with woody materials to dilute the effects of the problematic elements. Therefore, the objective of the present work was to compare emissions levels (PM, CO, CO2, NOx, SOx and HCl) and sintering/slagging propensities from reed canary grass (a purpose-grown energy with great development potential in the province of Quebec, Canada) combustion to co-combustion of reed canary grass with kaolin, limestone, magnesium lignosulfonate and wood. All blends resulted in a decrease of sintering, slagging, fouling and PM emissions because of formation of high melting compounds such as K-Al and K-Ca silicates in the bottom ash. Nevertheless, SOx and HCl emissions were increased because S and Cl were less bound as alkali chlorides and sulfates.
Keywords: biomass, combustion, emissions, ash, additives.
Technical field: Renewable Energy
Conference name: CSBE/SCGAB 2015 Annual Conference, Edmonton, AB, 5-8 July 2015.
Session name: Bioenergy III - Combustion, Gasification and Co-firing
Citation: Fournel, S., J. Palacios, S. Godbout, M. Heitz. 2015. Effect of additives on emissions and ash-related problems from small-scale combustion of reed canary grass. CSBE/SCGAB 2015 Annual Conference, Edmonton, AB, 5-8 July 2015.
Publisher: Canadian Society for Bioengineering
Language 1: en
Rights: Canadian Society for Bioengineering