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| 1 | 次生布风条件下气固重介质流化床褐煤分选提质研究显示文摘以0.074~0.300mm宽粒级磁铁矿粉为加重质,多种粒级石英砂为次生布风床层物料,研究了气固重介质流化床的床层膨胀特性、流化特性和密度分布特性.结果表明:石英砂平均直径越小,流化时的床层压降越小.当流化数为1.1~1.4时,床层不能充分流化;当流化数大于1.4时,床层能够流化,床层密度分布趋于均匀.以0.15~0.30mm石英砂作为次生布风床层的物料时,沿床高方向上的流化床床层密度标准差达到最小值0.19g/cm3.次生布风床层高度为20mm、静床层高度为50mm、流化数为2.0时,6~10mm褐煤的灰分离析度达到最大值0.60.此时,精煤产率达到38.44%,精煤灰分为8.60%,精煤硫分为0.57%,可取得较好的分选效果. | 谭明兵 贺靖峰 邵换男 黄歌 卜学制 杜天野 王涵 | 2017 | 中国矿业大学学报2017，46，2： | 7 |
| 2 | Flow-field analysis of a continuous gas-solid separation fluidized bed equipped with a moving scraper显示文摘Continuous gas-solid separation fluidized beds are one of the most widely used practical operation units for the dry separation of coal in China,particularly in Northwest China,and they can effectively promote the efficient and clean utilization of raw coal.In a continuous gas-solid separation fluidized bed,the bed flow field is the concrete manifestation of the fluidization characteristics.However,the complexity of the flow field increases under the action of a moving scraper.In this study,a combination of computational fluid dynamics(CFD)simulations and experimental measurements was used to study the changes in the flow field of a fluidized bed.The results showed that when the scraper moved,the local flow field(mainly characterized by the movement of medium particles)near the scraper was affected not only by the common airflow or bubbles,but also by the lateral driving force of the scraper.When the scraper speed was v_(l)<6.0 cm/s,it reduced the frequency of the formation of large bubbles and alleviated the random fluctuation of the nearby particle collision stress signals,which improved the fluidization stability of the bed.Additionally,the movement of the scraper affected the global flow field.The flow field shifted to the right near the scraper,with the direction of the scraper movement,while the flow field exhibited a leftward trend on the surface of the bed,accompanied by some vortices,in the middle and lower parts of the bed.Additionally,the critical height of the area,directly affected by the scraper,increased from 52 to 54 mm with an increase in its operating speed from v_(l)=2.96 cm/s to v_(l)=4.44 cm/s,respectively.This provides a theoretical basis for further understanding the hydrodynamic characteristics of fluidized beds. | Bo Lv Xiaowei Deng Chaojun Fang Xiangnan Zhu | 2021 | Particuology2021，19，4： | 1 |
| 3 | Segregation modes,characteristics,and mechanisms of multi-component lignite in a vibrated gas-fluidized bed显示文摘The segregation modes and characteristics of 1-6 mm multi-component lignite were studied in a microporous, vibrated, gas-fluidized bed of Φ110 mm ×400 mm. The effects of particle density and size, vibration frequency and amplitude, and gas velocity on these characteristics were considered. The average size, average density, size deviation coefficient, and density deviation coefficient were used to identify lignite size and density. The separation efficiency was adopted to evaluate the segregation performance,and the segregation mechanisms were explored. The results show that ε(size,max) of heterogeneous multisize-component lignite with K_(size) = 65% reaches 80% at f= 20 Hz, A = 5 mm, and N =(1,3). ε_(density,max) Of heterogeneous multi-density-component lignite with K_(density)= 25% reaches 50% at f = 15 Hz, A = 5 mm,and N =(1,1.5). The density segregations of 1-3 and 3-6 mm multi-component mixtures are remarkable,ε_(density,max)= 42% and 31% at f= 14 and 16 Hz, and A = 3 and 5 mm, respectively. The size segregation of 1-6 mm multi-component mixture is prominent and ε_(size,max)= 55% at f= 15 Hz, A = 5 mm. The mediumsized mixture with a narrow size distribution at low frequency is favorable for density segregation,and a mixture with a wider size distribution at high frequency is most favorable for size segregation.Precise control of gas flow and vibration as well as optimal design of the fluidized bed can improve the performance of segregation in the vibrated gas-fluidized bed. | Su Ding Luo Zhenfu Lei Lingyan Zhao Yuemin | 2018 | International Journal of Mining Science and Technology2018，28，2： | 1 |
| 4 | 气固流化床中流动结构调控的研究进展显示文摘由于气固流化床内部气相与颗粒相的流动使得两相的传热传质效率变高,所以在工业中可以影响工业产品的收率,这使得床层中的气体与颗粒的流动备受学者们的关注。充分了解床层中气固两相的行为进而提高气固两相之间的接触,对气固流化床的更广泛应用、工业产能的提高、资源的更有效利用等方面具有重要的意义。介绍目前气固流化床内流动结构的研究进展,总结了气泡与颗粒一定的运动规律。此外,对研究颗粒流动的方法进行了讨论,并对它们的应用前景进行了展望。 | 许琨文 刘飞 王伟文 | 2023 | 当代化工2023，52，4： | 0 |
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