Daniel M. Masekameni 1,2, Derk Brouwer1, Tafadzwa Makonese3, Isaac T. Rampedi2, Mary Gulumian4


Occupational Health Division, School of Public Health, University of the Witwatersrand, Parktown, Johannesburg 2193, South Africa
Department of Geography, Environmental Management and Energy Studies, University of Johannesburg, Johannesburg 2006, South Africa
SeTAR Centre, Faculty of Engineering and the Built Environment, University of Johannesburg, Johannesburg 2006, South Africa
National Institute for Occupational Health, National Health Laboratory Services, Braamfontein, Johannesburg 2000, South Africa



Received: April 23, 2018
Revised: July 19, 2018
Accepted: July 27, 2018
Download Citation: ||https://doi.org/10.4209/aaqr.2018.03.0105 

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Cite this article:
Masekameni, D.M., Brouwer, D., Makonese, T., Rampedi, I.T. and Gulumian, M. (2018). Size Distribution of Ultrafine Particles Generated from Residential Fixed-bed Coal Combustion in a Typical Brazier. Aerosol Air Qual. Res. 18: 2618-2632. https://doi.org/10.4209/aaqr.2018.03.0105


HIGHLIGHTS

  • We have investigated particle size distribution in coal burning device.
  • Particle mode decreases with improved combustion conditions.
  • Flaming and coking phases produced fine particles relative to ignition.
  • Particle # concentration increased with improved combustion conditions.
  • Domestic coal combustion contributes significantly to ultrafine particles.

ABSTRACT


Ultrafine particles (with a small mean diameter) released from domestic coal combustion are an important parameter to consider in air pollution, as they affect air quality and human health. It has been suggested that poor combustion conditions release particles of different sizes enriched with health-damaging chemicals, such as polycyclic aromatic hydrocarbons. Furthermore, both smouldering and highly efficient combustion conditions release particles, which are often carcinogenic. Information on the particle size distribution (PSD) of char or soot emitted from fixed-bed domestic coal combustion is limited, with many studies reporting on wood combustion. This study investigated the influence of coal combustion phases (ignition, flaming, and coking) on the particle number concentration and size distribution of ultrafine particles. D-grade bituminous coal was crushed to a particle diameter (Ø) of 40–60 mm and combusted in a laboratory designed coal brazier (Imbaula) during experimental investigations of the particle size distribution normalised to the particle number concentration against the particle diameter. Experiments were carried out using the reduced smoke top-lit updraft method, colloquially known as the Basa njengo Magogo (BnM) method. The tests were carried out in a laboratory-controlled environment. Particulate matter was monitored using a NanoScan Scanning Mobility Particle Sizer (SMPS). Particles from the top-lit updraft (TLUD) showed an ultrafine geometric mean diameter centred at approximately 109 ± 18.4 nm for the ignition phase, 54.9 ± 5.9 nm for the pyrolysis/flaming phase, and 31.1 ± 5.1 nm for the coking phase. The particle mode diameter rapidly increased during the ignition phase (145 nm) and gradually decreased during the flaming phase (35 nm) and the coking phase (31 nm). This study shows that during smouldering combustion conditions (ignition), the particle diameter increases, whereas it decreases as the temperature increases. This information is essential for estimating particle deposition in the lungs and the associated health risks.


Keywords: Particulate matter; Brazier; Scanning mobility particle sizer.

 



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