An experimental study into the effect of air staging distribution and position on emissions in a laboratory scale biomass combustor. (1st January 2017)

• Record Type: Journal Article
• Authors: Khodaei, Hassan; Guzzomi, Ferdinando; Yeoh, Guan H.; Regueiro, Araceli; Patiño, David
• Is Part Of: Energy. Volume 118(2017)
• Page Start: 1243
• Page End: 1255
• Publication Date: 2017-01-01
• Subjects: Fixed-bed -- Biomass combustion -- PM emissions -- CO -- Air-staging; Power resources -- Periodicals; Power (Mechanics) -- Periodicals; Energy consumption -- Periodicals; 333.7905
• DOI: 10.1016/j.energy.2016.11.008
• Languages: English
• ISSNs: 0360-5442

Abstract

Abstract: Air staging strategy is a proven technology to provide efficient biomass combustion with less gaseous and particulate emissions. In this study, two different secondary air distribution modules are employed at two different axial positions from the bed surface in a 15 kW fixed-bed laboratory scale combustion system includes grate and underfeed bed stocker. The effects of air staging on temperature, burning rate, gaseous and particulate emissions have been assessed over a selected primary air flow rate and a range of secondary air flow rates. Secondary air inlet module with uniform distribution of air results in 50% CO reduction by shifting the combustion to a more fuel lean environment and high temperature in the post-combustion zone. Remarkable decrease in particulate matters smaller than 1 μm is achievable through adjusting a uniform secondary air module in an appropriate distance from the bed. The non-uniform secondary air configuration increases the gaseous and particulate emissions than the uniform configuration. These results emphasise the need for further studies to better understand the effect of air staging on particulate and gaseous emissions. Highlights: Effect of air staging on gaseous, particulate emissions and temperature is studied. Remarkable decreases in PM and CO emissions in uniform air module. Particulate matters are highly sensitive to the secondary air inlet from the bed.