| Study on the distribution of PAHs in fly ash from coal and residual char combustion in a pressurized fluidized bed |
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| 作者姓名： | Hongcang ZHOU |
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| 作者单位： | Department of Environmental Science and Engineering, Nanjing University of information Science ＆ Technology, Nanjing 210044, China |
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| 摘 要： | Direct coal combustion not only has a low utilizing efficiency, but also produces a large amount of pollutants such as particulate, CO2, SO2, NOx, polycyclic aromatic hydrocarbons （PAHs）, PCDD/PCDFs, and so on. Coal gasification is a clean coal technology that presents good prospects for coal use, mainly for producing electricity with a high coal conversion efficiency and low environmental impact. However, there is a problem about the minimization of PAHs in coal gasification or direct coal combustion. PAHs are harmful to the environment and human health due to their high degree of mutagenicity and carcinogenicity when they enter human bodies through breathing, eating, and drinking. It is said that about 75%-90% cancers of human beings are mainly caused by PAHs. So the US EPA has prioritized 16 PAH compounds as hazardous air pollutants; these compounds are naphthalene （NAP）, acenaphthylene （AcPy）, acenaphthene （AcP）, fluorene （Flu）, phenanthrene （PhA）, anthracene （ANT）, fluoranthene （FluA）, pyrene （Pyr）, benzo （a） anthracene （BaA）, chrysene （Chr）, benzo （b） fluoranthene （BbF）, benzo （k） fluoranthene （BkF）, benzo （a） pyrene （BaP）, indeno（1,2,3,-cd） pyrene In（1,2,3-cd） P], dibenzo （a,h） anthracene （DbA）, and benzo （ghi） perylene （BghiP）. The residual char is one of the main products during coal gasification, and then it is brought into the combustion chamber to combust. To investigate the distribution of PAHs in fly ash, the combustion of coal and residual char was tested in a pressurized spouted fluidized bed. After Soxhlet extraction and K-D concentration, the contents of 16 PAHs recommended by US EPA in coal, residual char, and fly ash, were analyzed by a HPLC coupled with fluorescence and diode-array detection.
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| 关 键 词： | PAHs 煤 加压燃烧 硫化床 飞尘 |
Study on the distribution of PAHs in fly ash from coal and residual char combustion in a pressurized fluidized bed |
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| Hongcang ZHOU.Study on the distribution of PAHs in fly ash from coal and residual char combustion in a pressurized fluidized bed[J].Chinese Journal of Geochemistry,2006,25(B08):54-55. |
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| Abstract: | |
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| Keywords: | PAHs coal and residual char pressurized combustion distribution fluidized bed |
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