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Size Distribution of Ultrafine Particles Generated from Residential Fixed-bed Coal Combustion in a Typical Brazier

Category: Air Pollution and Health Effects

Accepted Manuscripts
DOI: 10.4209/aaqr.2018.03.0105
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Daniel M. Masekameni 1,2, Derk Brouwer1, Tafadzwa Makonese3, Isaac T. Rampedi2, Mary Gulumian4

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

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 of small mean diameter released from domestic coal combustion is an important parameter to consider as it affects air quality and human health. It is suggested that poor combustion conditions release particles of different sizes enriched with health-damaging chemicals such as polycyclic aromatic hydrocarbons. Furthermore, both smouldering and high efficient combustion conditions release particles, which are often carcinogenic. Information on fixed-bed domestic coal combustion char or soot particle size distribution (PSD) is limited, with many studies reporting on wood combustion. This study investigated the influence of coal combustion phases (ignition, flaming and coking) on particle number concentration and size distribution of ultrafine particles. D-grade bituminous coal was crushed to particle diameter of Ø 40–60 mm, combusted in a laboratory designed coal brazier (Imbaula) during experimental investigations of particle size distribution normalised to particle number concentration against 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): particle diameter increases, while as temperature increase the particle size decreases. The information is essential in estimating particle lung deposition and associated health risks.

Keywords

Particulate matter Brazier Scanning mobility particle sizer


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