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| 1 | 双循环流化床提升管中气固流动特性及接触效率研究显示文摘以催化裂化平衡剂和常温空气为介质,在新型双循环流化床冷态模拟装置上,考察了单、双侧下料结构、双路循环颗粒循环速率比例对提升管内气固流动状态的影响,并提出了一种新的气固接触效率的概念。结果表明:单、双侧下料结构的不同对提升管内颗粒浓度的分布影响不大,其差异主要体现在提升管预提升区和底部反应区;双侧下料时的颗粒浓度径向分布均匀性明显优于单侧下料,且两路颗粒循环速率越接近,颗粒浓度径向分布越均匀,轴对称性越好,气固接触效率越高;降低表观气速或增大颗粒循环速率均有利于提高气固接触效率。 | 韩超一 吴文龙 陶蕾 李春义 | 2016 | 石油炼制与化工2016，47，3： | 11 |
| 2 | 多相反应器的非均相特性测量技术进展显示文摘为了增大传质和传热面积,多相反应器中分散相通常以颗粒形式(气泡、液滴或固体颗粒)分散、运动于连续相流体中,与周围的连续相及其他分散相颗粒的相互作用使颗粒和颗粒群呈现复杂的时空非均相行为。多相反应器中非均相特性的准确描述是发展准确的反应器模型、进行定量诊断分析和优化设计高效反应器的必要基础。本文总结了多相反应器中颗粒和颗粒群的复杂时空行为,提出了当前多相反应器非均相特性测量正面临的在线测量、高分散相浓度和多分散相等主要难题;综述了多相反应器测量技术研究的进展,指出了PC和PV等光纤测量技术是较经济的高浓度两相反应器的在线测量技术,而侵入式照相法测量结果更准确,具备解决上述测量难题方面的可行性,具备较好的应用前景,但要实现工业在线测量仍存在一些高难度的技术问题需要解决。 | 李向阳 王浩亮 冯鑫 陈杰 毛在砂 李国征 杨超 | 2019 | 化工进展2019，38，1： | 9 |
| 3 | 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 |
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