Dioxin emissions from coal combustion in domestic stove: Formation in the chimney and coal chlorine content influence

Author:

Paradiz Bostjan1,Dilara Panagiota2,Umlauf Gunther2,Bajsic Ivan3,Butala Vincenc3

Affiliation:

1. Slovenian Environment Agency, Ljubljana, Slovenia

2. Joint Research Centre of the European Commission, Institute for Environment and Sustainability, Ispra, Italy

3. University of Ljubljana, Faculty of Mechanical Engineering, Ljubljana, Slovenia

Abstract

Combustion experiments conducted in domestic stove burning hard coal demonstrated a predominant influence of the coal chlorine content on the PCDD/F emissions, together with a pronounced effect of the flue gas temperature. PCDD/F concentrations of over 100 ng TEQ/m3, three orders of magnitude higher than in a modern waste incinerator, were measured in the flue gases of a domestic stove when combusting high chlorine coal (0.31 %). The PCDD/F concentrations in the flue gases dropped below 0,5 ng TEQ/m3, when low chlorine coal (0.07 %) was used. When low chlorine coal was impregnated with NaCl to obtain 0.38 % chlorine content, the emission of the PCDD/Fs increased by two orders of magnitude. Pronounced nonlinearity of the PCDD/F concentrations related to chlorine content in the coal was observed. The combustion of the high chlorine coal yielded PCDD/F concentrations in flue gases one order of magnitude lower in a fan cooled chimney when compared to an insulated one, thus indicating formation in the chimney. The influence of flue gas temperature on the PCDD/F emissions was less pronounced when burning low chlorine coal. The predominant pathway of the PCDD/F emissions is via flue gases, 99 % of the TEQ in the case of the high chlorine coal for insulated chimney.

Publisher

National Library of Serbia

Subject

Renewable Energy, Sustainability and the Environment

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