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Advanced Multi-Product Coal Utilization By-Product Processing Plant. Technical Progress Report for the Period-1 October 2005 to 31 December 2005.
| 题名： | Advanced Multi-Product Coal Utilization By-Product Processing Plant. Technical Progress Report for the Period-1 October 2005 to 31 December 2005. |
| 作者： | groppo, j. robi, t. |
| 关键词： | tables(data), graphical materials, bituminous coal, sulfur, sedimentation, stratigraphy, resource assessment, vibracoring |
| 摘要： | The objective of the project is to build a multi-product ash beneficiation plant at Kentucky Utilities 2,200-MW Ghent Generating Station, located in Carroll County, Kentucky. This part of the study includes an investigation of the secondary classification characteristics of the ash feedstock excavated from the lower ash pond at Ghent Station. The secondary classification testing was conducted using a continuous demonstration-scale lamella classifier that was operated at a feed rate of 0.3 to 1.5 tons/hr. Feed to the secondary classifier was generated by operating the primary classifier at the conditions shown to be effective previously. Samples were taken while the secondary classifier was operated under a variety of conditions in order to determine the range of conditions were the unit could be efficiently operated. Secondary classification was effective for producing an ultra-fine ash (UFA) product. Inclined lamella plates provided an effective settling surface for coarser ash particles and plate spacing was shown to be an important variable. Results showed that the closer the plate spacing, the finer the size distribution of the UFA product. A dosage of 2 g/kg of dispersant provided a UFA product with an average particle size of 4 to 6 mm. At lower dosages, UFA products were coarser (d50 6 to 10 mm). Another important operating parameter for effective secondary classification was superficial velocity (SV), a parameter related to the feed rate and classifier geometry. Reducing the SV provided finer-sized products; however, it also reduced yield. In consideration of product grade and recovery, operating at a SV of less than 15 cm/min provided acceptable results (d50 = 3 to 6 mm, 30-60% 5 mm recovery) with reasonable dispersant dosages. |
| 总页数： | u0702；22p |
| 报告类型： | 科技报告 |
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