Combustion behavior of single iron particles-part I: An experimental study in a drop-tube furnace under high heating rates and high temperatures

• DOI: 10.1016/j.jaecs.2022.100097
• Publication Date: 2022-11-06T16:36:16Z
• Authors: Aidin Panahi; Di Chang; Martin Schiemann; Aki Fujinawa; Xiaocheng Mi; Jeffrey M. Bergth...; Yiannis A. Levendis
• Keywords: Particle (ecology); Tube furnace

Micrometric spherical particles of iron in two narrow size ranges (38–45) µm and (45–53) were injected a bench scale, transparent drop-tube furnace (DTF), electrically heated to 1400 K. Upon experiencing high heating rates (104–105 K/s) the ignited burned. Their combustion behavior was monitored pyrometrically cinematographically at three different oxygen mole fractions (21%, 50% 100%) nitrogen. The results revealed that readily exhibited bright stage followed by dimmer stage. There evidence formation envelope micro-flames around (nanometric particle mantles) during combustion. As burning fell gravity DTF, contrails these fine formed their wakes. Peak temperatures flames range 2500 K air, climbing 2800 either or 100% O2. Total luminous durations particles, aforesaid ranges, 40–65 ms. Combustion products bimodal distribution, consisting micrometric black magnetite (Fe3O4), sizes similar precursors, reddish nanometric oxide mostly hematite (Fe2O3).