Abstract
Coal combustion is a dominant source of Hg in atmosphere and is believed to be responsible for increases of atmospheric Hg since industrial revolution. In this study, we compared characteristics of different Hg species emitted from combustion of different types of coal in air and oxygen-enriched environment. Total Hg emissions from coal combustion increased significantly with increase of combustion temperature and the majority of emitted Hg existed in the form of Hg0. Total Hg emissions were 8.61 (5.38-16.48) ng/g (average and range) at 500°C, while increased to 18.65 (6.49-40.38) ng/g at 900°C. After burning at high temperatures, the higher percentage of reactive Hg species was observed in the flue gases, which was probably caused by promotion of Hg0 oxidation due to the higher flue gas temperature. Compared with air environment, more Hg (3.00-17.96ng/g higher than air at 900°C) was remained in ashes, and the percentage of reactive Hg in flue gases increased by 193%-826% at 900°C under O2/CO2, which is beneficial for reduction of Hg emissions from coal combustion.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
More From: Bulletin of Environmental Contamination and Toxicology
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.