title: Fuel nitrogen conversion and release of nitrogen oxides during coal gangue calcination.
abstract: The pollution emission during the widespread utilization of coal gangue in construction industry has long been neglected. In present study, the NO x release behaviors in a simulation experiment of coal gangue calcination in construction industry were systematically investigated. The corresponding evolution of nitrogen functionalities in coal gangue was also discussed. Results showed that pyrrolic (N-5) and pyridine N-oxide (N-6-O) forms nitrogen were relatively abundant in the raw gangue. During calcination, the N-5 and N-6-O form nitrogen greatly decreased and converted to quaternary nitrogen (N-Q). It was found that NO2 was formed under slowly heating-up condition and at 600 °C under isothermal condition, while only NO was detected with further increase of temperature. From 600 to 1000 °C, the conversion ratio of fuel nitrogen to NO x increased from 8 to 12 %. The char nitrogen was found greatly contribute to NO formation, which may bring difficulty to the abatement of NO x emission during coal gangue calcination.
authors.affiliation: Beijing Key Laboratory for Solid Waste Utilization and Management and Department of Energy and Resource Engineering, College of Engineering, Peking University, Beijing, 100871, People's Republic of China.
authors.forename: Yingyi
authors.initials: Y
authors.lastname: Zhang
authors.forename: Xinlei
authors.initials: X
authors.lastname: Ge
authors.forename: Lili
authors.initials: L
authors.lastname: Liu
authors.forename: Xidong
authors.initials: X
authors.lastname: Wang
authors.forename: Zuotai
authors.initials: Z
authors.lastname: Zhang
mesh_terms: D003031:Coal / Q000032:analysis*; D003252:Construction Materials; D004785:Environmental Pollutants / Q000737:chemistry*; D004787:Environmental Pollution; D009584:Nitrogen / Q000737:chemistry*; D009589:Nitrogen Oxides / Q000737:chemistry*; D013694:Temperament
chemical_list: D003031:Coal; D004785:Environmental Pollutants; D009589:Nitrogen Oxides; D009584:Nitrogen