title: Evaluation of gas emissions from coal stockpile.
abstract: Gas emissions of carbon dioxide, methane, dimethylsulfide, carbon monoxide and oxygen from a coal stockpile in Velenje were determined. Gases from the coal stockpile were collected in Alltech Standard sampling bags and then analysed using a capillary gas chromatograph and electrochemical sensors. A flame ionisation detector equipped with a Zr/Ni catalytic reactor was used for the determination of methane and carbon dioxide. Dimethylsulfide was detected with a flame photometric detector, and the concentrations of carbon monoxide and oxygen were determined by use of electrochemical sensors. The results showed that the main influence on gas emissions is related to the ambient temperature. Emissions of carbon dioxide during summer 2001 (average temperature during sampling period was 24 degrees C) were approximately 30-times higher than during winter 2002 (average temperature during sampling period was -2 degrees C) and were also influenced by the oxygen concentration. Carbon dioxide is mainly formed by oxidation of coal. Methane and dimethylsulfide are desorbed from coal, and are present in higher concentrations in stockpile emissions when stockpiles are renewed. The dimethylsulfide concentration, in contrast to laboratory experiments in stockpile emissions, falls immediately due to photo-degradation.
authors.affiliation: ERICo Velenje, Institute for Ecological Research, Koroska 58, 3320-SI Velenje, Slovenia.
authors.forename: J
authors.initials: J
authors.lastname: Kozinc
authors.forename: L
authors.initials: L
authors.lastname: Zupancic-Kralj
authors.forename: A
authors.initials: A
authors.lastname: Zapusek
mesh_terms: D002245:Carbon Dioxide; D002248:Carbon Monoxide; D002849:Chromatography, Gas; D003031:Coal / Q000032:analysis*; D004784:Environmental Monitoring; D005740:Gases / Q000032:analysis*; D008697:Methane; D010100:Oxygen; D012621:Seasons; D017524:Slovenia; D013440:Sulfides; D013696:Temperature
chemical_list: D003031:Coal; D005740:Gases; D013440:Sulfides; D002245:Carbon Dioxide; D002248:Carbon Monoxide; D008697:Methane; D010100:Oxygen