OPEN ACCESS

Articles online

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

Category: Air Pollution and Health Effects

Volume: 18 | Issue: 10 | Pages: 2618-2632
DOI: 10.4209/aaqr.2018.03.0105
PDF

Export Citation:  RIS | BibTeX

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 (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


Related Article

Source Identification on High PM2.5 Days Using SEM/EDS, XRF, Raman, and Windblown Dust Modeling

Jeff Wagner , Zhong-Min Wang, Sutapa Ghosal, Stephen Wall
Accepted Manuscripts
DOI: 10.4209/aaqr.2019.05.0276
PDF

Analysis of PAHs Associated with PM10 and PM2.5 from Different Districts in Nanjing

Xiansheng Liu, J├╝rgen Schnelle-Kreis, Brigitte Schloter-Hai, Lili Ma , Pengfei Tai, Xin Cao, Cencen Yu, Thomas Adam, Ralf Zimmermann

Traffic Condition and Emission Factor from Diesel Vehicles within the Kathmandu Valley

Enna Mool, Prakash V. Bhave, Nita Khanal, Rejina M. Byanju, Sagar Adhikari, Bhupendra Das, Siva P. Puppala

Comparative Study of PAHs in PM1 and PM2.5 at a Background Site in the North China Plain

Yan Zhang, Lingxiao Yang , Ying Gao, Jianmin Chen, Yanyan Li, Pan Jiang, Junmei Zhang, Hao Yu, Wenxing Wang
;