FUEL 143 |
| Release behavior of sodium and potassium was followed during pyrolysis and gasification of coals up to 1473K. The release extents of sodium and potassium for a low rank coal increased with the increase of terminal temperature and attained to more than 40% and 55%, respectively. Bituminous coals showed the release extents of sodium and potassium lower than 20% in the whole temperature range. Sodium and potassium in coal and char were classified into five fractions by a serial dissolution method with H2O, CH3COONH4, HCl, H2SO4 and HF solutions. The low rank coal contained high extents of H2O and CH3COONH4 solubles of sodium, which decreased with the increase of pyrolysis temperature. H2O and CH3COONH4 solubles for bituminous coals changed to H2SO4 soluble with the increase of temperature. Kinetic analysis was conducted for the release behavior of sodium and potassium. The release behavior was successfully simulated by the determined kinetic parameters with the amounts of solubles. |
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Mercury and Trace Metal Transformations: Modeling
8:25 AM-11:35 AM, Tuesday, August 21, 2007 Boston Park Plaza -- Chartes River Room, Oral
Sci-Mix
Division of Fuel Chemistry |