COAL PROPERTY EFFECTS ON N2O AND NOx FORMATION FROM CIRCULATING FLUIDIZED BED COMBUSTION OF COAL |
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Authors: | Hao Liu Bo Feng Jidong Lu Chuguang Zheng |
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Affiliation: |
a National Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan, Hubei, China |
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Abstract: | The effects of coal properties on N2O and NOx formation from circulating fluidized bed combustion of coal was examined through burning nine typical coals and a coal shale, widely used in China over a wide range of coal ranks, in a bench-scale circulating fluidized bed. It was found that N2O and NOx formation had similar dependence on coal rank. Fixed carbon content and nitrogen content were the most important coal properties to influence N2O and NOx emissions from circulating fluidized bed combustion of coal. A coal with high fixed carbon content had high conversion ratio of fuel-N into N2O and NOx. The conversion ratio of fuel-N into N2O or NOx increased with nitrogen content of coal, whereas it decreased with O/N ratio. No significant correlation between conversion ratio of fuel-N into N2O or NOx and C/N ratio was identified. To clarify the coal property effect, investigation of a wide range of coal rank, is important. |
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Keywords: | Nitrous oxide Nitric oxide Circulating fluidized bed coal combustion Coal rank Coal |
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