Coal fly ash based carbons for SO2 removal from flue gases |
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| Authors: | B Rubio MT Izquierdo |
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| Institution: | 1. School of Energy and Power Engineering, Shandong University, Jinan 250061, China;2. State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China;3. School of Energy and Power Engineering, North University of China, Taiyuan 030051, China;4. State Grid Shandong Electric Power Research Institute, Jinan 250002, China |
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| Abstract: | Two different coal fly ashes coming from the burning of two coals of different rank have been used as a precursor for the preparation of steam activated carbons. The performance of these activated carbons in the SO2 removal was evaluated at flue gas conditions (100 °C, 1000 ppmv SO2, 5% O2, 6% H2O). Different techniques were used to determine the physical and chemical characteristics of the samples in order to explain the differences found in their behaviour. A superior SO2 removal capacity was shown by the activated carbon obtained using the fly ash coming from a subbituminous–lignite blend. Experimental results indicated that the presence of higher amount of certain metallic oxides (Ca, Fe) in the carbon-rich fraction of this fly ash probably has promoted a deeper gasification in the activation with steam. A more suitable surface chemistry and textural properties have been obtained in this case which explains the higher efficiency shown by this sample in the SO2 removal. |
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