An observation of combustion behavior of a single coal particle entrained into hot gas flow

Devolatilization and volatiles reaction of individual coal particles in the context of FGM tabulated chemistry

“…Contrary to the configuration of Lee and Choi [52] , Molina and Shaddix [3] , Shaddix and Molina [4] , Liu et al [57] and Schiemann et al [37] inject particles in the center of a non-premixed Hencken burner via an inert carrier gas stream through a particle injection tube aligned with the flow of hot combustion products. Out of their measurements, the authors extracted ignition delays as well as temporal quantifications of the homogeneous reaction phase.…”

“…For instance, experimental studies regarding the shape, size and intensity of the visible flame of single coal particles were conducted by Lee and Choi [52] . The authors injected the particles via a carrier gas stream orthogonally into hot gases generated by a globally lean, premixed propane flat flame.…”

A complete review based on various aspects of pulverized coal combustion

“…They explored the influence of oxygen concentration, chemical, and thermal effects on coal char combustion to explain the mechanism in oxy‐fuel combustion. They reported the contribution of oxygen concentration, thermal, and chemical effects as 6.7%, 11.2%, and 82.1% on char combustion rate of 91‐μm char at an ambient gas temperature of 1200 K. Lee and Choi visualized the burning of a single coal particle in the entrained hot gas flow. They showed the combustion process sequence in space and time by processes of particle heat‐up, the release of volatile matter and its oxidation, and char combustion.…”

Characterization of single coal particle combustion within oxygen-enriched environments using high-speed OH-PLIF

“…On the one hand, coal combustion is measurements, optical diagnostics have been applied to these configurations. Particle temperatures were measured using two-or three-color pyrometry [17,18], particle size was measured by an extended stereoscopic pyrometer [19], or flame luminosity was recorded to visualize ignition and determine the duration of volatile combustion [12,14,16,20]. Recording of CH* was exploited to characterize the onset of ignition and duration of volatile combustion, which was found to be a better indicator than blackbody emission from soot or hot char [12].…”

“…For a fundamental investigation of coal ignition and combustion processes, laminar flow reactors are used regularly providing an oxygen-enriched exhaust gas environment at high temperatures where single coal particles are introduced [12][13][14][15][16]. For in situ and noninvasive Abstract This work presents first-of-its-kind high-speed planar laser-induced fluorescence measurements of the hydroxyl radical in the boundary layer of single coal particles.…”