Oxidation behavior of particulate matter sampled from the combustion zone of a domestic pellet-fired boiler
2013
Fernandes, Ulysses | Guerrero González, Marta | Millera, Ángela | Bilbao, Rafael | Alzueta, María U. | Costa, Mario
This article describes an experimental investigation of the oxidation behavior of particulate matter (PM) sampled with the aid of a rapid dilution probe from a number of measurement positions located in the near the burner region of a domestic wood pellet-fired boiler. Morphology and chemical composition of the collected PM samples were examined in a scanning electron microscope equipped with an energy dispersive X-ray spectroscopy detector. To evaluate the oxidative reactivities of the PM samples, experiments were performed in a quartz reactor with an inlet oxygen concentration of 500ppm in a nitrogen flow, a temperature of 900°C, and a flow rate of 1000mL/min (STP). Results obtained from the oxidation tests indicated that the PM samples collected from locations near the visible flame boundary were significantly less reactive towards O₂ than those sampled from locations along the burner axis. This fact may be due to the higher temperatures occurring near the visible flame boundary, resulting in PM samples with a higher degree of material organization and a lower availability of active sites.
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