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喷动流化床

喷动流化床的相关文献在1991年到2022年内共计153篇,主要集中在化学工业、能源与动力工程、力学 等领域,其中期刊论文93篇、会议论文10篇、专利文献291041篇;相关期刊55种,包括东南大学学报(自然科学版)、华东理工大学学报(自然科学版)、安徽理工大学学报(自然科学版)等; 相关会议9种,包括第15届全国干燥技术交流会、2011年中国工程热物理学会多相流学术会议、中国工程热物理学会2010年多相流学术会议等;喷动流化床的相关文献由277位作者贡献,包括章名耀、钟文琪、肖睿等。

喷动流化床—发文量

期刊论文>

论文:93 占比:0.03%

会议论文>

论文:10 占比:0.00%

专利文献>

论文:291041 占比:99.96%

总计:291144篇

喷动流化床—发文趋势图

喷动流化床

-研究学者

  • 章名耀
  • 钟文琪
  • 肖睿
  • 金保升
  • 颜涌捷
  • 李乾军
  • 任铮伟
  • 陈明强
  • 仲兆平
  • 康仕芳
  • 期刊论文
  • 会议论文
  • 专利文献

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    • 赵俊楠; 王会宁; 戈朝强; 刘国栋
    • 摘要: 喷动流化床中,在床底部通入高速射流气体,由轴向射流在床内形成有规律的气-固两相流动,该技术在工业中有着广泛的应用.本文采用Euler-Euler双流体模型(TFM),对喷动流化床内的气固两相流动过程进行模拟.计算得出了不同喷动和流化速度下床内形成的流动结构形态.计算得到的床内颗粒浓度分布规律与实验数据吻合,并获得了不同高度上沿不同方向的速度分布,以及不同流化区域颗粒拟温度的分布规律.
    • 马华庆; 赵永志
    • 摘要: 采用计算流体力学,离散单元法(CFD-DEM)模型对杆状颗粒在喷动流化床中的流动及混合行为进行数值模拟研究,其中杆状颗粒采用超椭球模型进行描述.通过模拟结果,考察流化气速、喷动气速和颗粒形状对流动与混合的影响.结果表明,杆状颗粒在喷动流化床中的流动具有典型喷动床的喷动特性;提高喷动气速与流化气速均有助于颗粒混合,且流化气速对流动与混合的影响大于喷动气速.颗粒形状主要通过颗粒互锁与颗粒长轴取向一致性这2个因素影响颗粒混合,提出较简单的方法用以量化颗粒长轴取向的一致性.在上述2个因素的作用下,当杆状颗粒长径比较小时,增加长径比会抑制颗粒混合;当长径比较大时,增加长径比会促进颗粒混合.
    • 摘要: 常州一步干燥设备有限公司研发生产的药用多功能制粒包衣机具有混合、制粒、包衣、干燥、冷却等功能,其适用范围比较广,特别是在制药生产中取得了成功的应用.该药用多功能制粒包衣机将喷雾干燥制粒、流化床、喷动流化床以及旋转造粒等技术有机地结合为一体,可以均匀地混合流态化的物料,如粉末、颗粒、微丸等.其中,利用空气的多向运动(如水平、射线和切线方向),可均匀混合物料.
    • 卜昌盛; 王昕晔; 张居兵; 朴桂林
    • 摘要: 基于颗粒-颗粒、颗粒-流体间的传热机制建立了颗粒尺度下的传热模型,并将其与计算流体力学-离散颗粒模型(CFD-DEM)耦合,建立了CFD-DEM传热模型,在传热计算中采用真实的颗粒接触刚度修正了颗粒-颗粒间的传热.采用典型喷动流化床内的颗粒传热实验数据验证了CFD-DEM传热模型的准确性,并利用该模型分析了喷动流化床内的传热特性.结果表明:喷动流化床内颗粒的传热系数受其运动状态的影响,颗粒在环隙区域外循环的传热系数比内循环传热系数大;喷动流化床内平均传热系数呈对称分布,流化区域内的平均传热系数大于非流化区域,床体底部两侧及气体入口处的平均传热系数最大,床层中央区域的平均传热系数较小.%A CFD-DEM heat transfer model was established by coupling the model set up based on the mechanism of both particle-particle and particle-fluid-particle heat transfer with the computation fluid dy namics-discrete particle model (CFD-DEM),which adopts actual contact stiffness to calculate the heat transfer.The CFD-DEM heat transfer model was verified with experimental data of a typical spouted fluidized bed,and the model was then used to further study the heat transfer characteristics of the bed.Results indicate that the heat transfer coefficient of particles is greatly influenced by their flow status,and it is higher in interior cycle than in exterior cycle.The heat transfer coefficient is symmetrically distributed in the spouted fluidized bed,which is higher in fluidized region than in un-fluidized region.The highest heat transfer coefficient appears in both sides of the bed bottom and at the gas entrance,whereas,relatively low heat transfer coefficient exists in the middle region.
    • 张青; 杨雪峰; 周勇
    • 摘要: In order to elucidate the fluidization mechanism of ultrafine powder in the spouted-fluidized bed with a draft tube and establish the foundation for further optimization and improvement of the fluidized bed structure and operating conditions, the numerical simulation of the flow field in the spouted-fluidized bed with draft tube was carried out using the standardk-ε turbulence model. The effects of inlet fluidizing gas velocity and ejecting gas velocity on the flow field and velocity distribution were investigated. Meanwhile the effects of sound pressure level and sound frequency on distribution of axial gas velocity and root mean square (RMS) in annulus and fountain areas were investigated, respectively. The results showed that the gas flow in the spouted-fluidized bed with draft tube was characterized by the internal circulation at high velocity jet flow. The gas flow rate decreased with the increase of the fluidizing gas velocity and increased with the ejecting gas velocity. The introduction of sound field made the distribution of the gas flow in annulus area and fountain area more uniform, which significantly increased the intensity of turbulence in annulus and fountain area. The intensity of turbulence increased with the increase of sound pressure level and decreased slightly with the increase of sound frequency.%为阐明超细粉在声场导向管喷动流化床内的流化机理,并为进一步优化和完善床层结构及操作条件提供基础,采用标准 k-ε湍流模型计算了导向管喷动流化床内的单相气体流场,考察了进口流化气速和射流气速对气体流动规律的影响,以及声场对导向管喷动流化床内气体轴向速度分布及其脉动均方根的影响。结果表明:在高速射流条件下,导向管喷动流化床内气体呈内循环流动,气体循环流量随流化气速度的增加而减小,但随射流气速度的增加而增加;外加声场使环隙区和喷泉区的气体流动更加均匀,显著增加环隙区和喷泉区气流的湍动程度,且湍动程度随声压级的增大而显著增大,随声波频率的升高而小幅度降低。
    • 李晋; 李丹
    • 摘要: 文章对生产多晶硅的改良西门子法,其副产物四氯化硅氯氢化制备三氯氢硅的工艺方法进行比较分析,对喷动流化床为核心设备的原理、结构、特点进行全面分析介绍,提出使用喷动流化床为核心设备的氯氢化工艺,归纳出最小喷动流化气速关联式,为喷动流化床的氯氢化技术工程化奠定了重要基础.
    • 李静; 金光远; 张慜; 崔政伟; 仲建勋
    • 摘要: 为探索脉冲喷动微波真空干燥系统(PSMVD)中气固喷动流化床的动力特性,采用基于无粘性两相流理论,使用计算流体力学欧拉-欧拉方法(CFD)对二维喷动流化床中喷动流化特性进行了数值研究,对啧动流化床的动力特性和颗粒运动分布特征进行了揭示,这些因素影响颗粒空间位置分布和其微波加热的均匀性.结果表明,采用欧拉-欧拉双流体模型,成功获得脉冲喷动微波真空干燥腔内的二维喷动流化床的喷动流化动力特性;喷动流化过程在特定气流喷动速度下有一个初始阶段和准稳态流化阶段;喷动速度是控制颗粒在喷动床中颗粒位置的重要因素,存在一个影响流化模式转变的关键喷动速度;射流穿透深度和喷射速度之间存在线性关系.
    • 张雪芳; 陈津; 郝赳赳; 郭丽娜; 刘金营; 张森浩
    • 摘要: Experimental research of the spouted fluidized characteristics has been carried out in a cone‐base cylindrical spout‐fluid bed with the height of 1 000 mm ,inner diameter of 30 mm and nozzle diameter of 10 mm .High‐carbon ferrochrome powders with different sizes and masses were used as bed materials .The changing relation of the maximum bed pressure drop ,the mini‐mum spout‐fluidized velocity and bed voidage with the bed material properties was researched in detail .T he result show s that bed materials appear a spout‐fluid bed characteristic w hen the initial static bed height of high‐carbon ferrochrome powders is higher than the maximum spouted bed height by theoretical calculations .The particle size and density are the main factors that affect spouted fluidizing quality . The maximum spouting pressure drop progressively increases with static bed height and particle density and tends to increase with particle diameter .The minimum spout‐fluidizing velocity grows with static bed height and particle diameter .The velocity bed void‐age goes up as the superficial gas velocity increases .The material mass has a more remarkable in‐fluence on the bed voidage of coarse particles than the fine particles .In addition ,the flow regime map of spouted fluidized bed with mixed high‐carbon ferrochrome powder was developed ,which is based on spout‐fluidizing characteristics and flow patterns transitions .%设计了喷动流化床试验装置,研究了不同物料粒径和物料质量的高碳铬铁粉冷态喷动流化特性,考察了最大床层压降、最小喷动流化速度、床层空隙率与物料特性之间的变化关系。试验结果和分析计算表明,在同样条件下,高碳铬铁粉在喷动流化床中的起始静床层高度大于最大喷动床床层高度时,物料才具有典型的喷动流化特征;物料密度、物料粒径是影响喷动流化形态的主要因素;最大床层压降随物料质量、物料密度的增加而增大,随物料粒径的增加趋于增大;最小喷动流化速度均随物料质量、物料粒径的增加而增大;床层空隙率随喷动流化气体流量的增加而增大,物料质量对粗颗粒物料的床层空隙率影响较大,对细颗粒物料的床层空隙率影响较小。根据高碳铬铁粉的冷态喷动流化特性和形态变化,得出了高碳铬铁粉混合物料的喷动流化床操作相图。
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