Experimental investigations of single particle and particle group combustion in a laminar flow reactor using simultaneous volumetric OH-LIF imaging and diffuse backlight-illumination

Tao Li, Martin Schiemann, Jan Köser, Andreas Dreizler and Benjamin Böhm

Renewable and Sustainable Energy Reviews, 2021, vol. 136, issue C

Abstract: The volatile combustion of Colombian high-volatile bituminous coal was experimentally studied in a laboratory laminar flow reactor. The volatile flames corresponding to the single particle and particle group combustion were visualized using non-intrusive multi-parameter optical diagnostics. In the present study, high-speed laser-induced fluorescence of OH radicals (OH-LIF) was applied to study igniting particles by temporally tracking OH-LIF signals in the gas-phase flame. A novel acousto-optic deflector combined with a 10 kHz dye laser was employed for laser scanning through a probe volume with a thickness of a few millimeters. The three-dimensional OH-LIF signals were used to reconstruct the volatile flame structures of burning particles. Simultaneously, diffuse backlight-illumination (DBI) is implemented to measure the size and the spatial distribution of particles to distinguish between single and group particle combustion. For single particles, starting from the onset of ignition, the OH-LIF intensity reaches its maximum within several milliseconds, which is temporally resolved by employing a laser scanning system. The gas-phase ignition starts downstream of the particles. As the particle size increases, the flame stand-off distance increases, whereas the ratio of the flame stand-off distance and the particle diameter decreases, which ranges from 2 to 4 for the coal particles investigated. For particle groups, the flame topology is evaluated for individual reconstructions with different particle number densities (PND). As the PND increases, the volatile flames are pushed outwards to the boundary of particle clouds and a non-flammable region emerges in the center of volatile flames. Soot formation is observed and becomes increasingly intensive as the PND increases.

Keywords: Single particle; Particle group; High-volatile bituminous coal; Ignition and volatile flame; Volumetric OH-LIF and DBI (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S1364032120306651
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:rensus:v:136:y:2021:i:c:s1364032120306651

Ordering information: This journal article can be ordered from
http://www.elsevier.com/wps/find/journaldescription.cws_home/600126/bibliographic
http://www.elsevier. ... 600126/bibliographic

DOI: 10.1016/j.rser.2020.110377

Access Statistics for this article

Renewable and Sustainable Energy Reviews is currently edited by L. Kazmerski

More articles in Renewable and Sustainable Energy Reviews from Elsevier
Bibliographic data for series maintained by Catherine Liu ().