LWS400卧螺离心机参数变化对转鼓强度和刚度的影响

采用Solid Works软件建立LWS400卧螺离心机转鼓几何模型并导入ANSYS Workbench软件中进行有限元分析。分别改变转鼓转速、转鼓壁厚和液池深度三个参数并讨论由此对转鼓强度和刚度的影响,以便为后续的优化设计方案提供参考。讨论结果表明:转鼓转速的提高或壁厚的减小都对转鼓强度和刚度有明显的影响,液池深度的变化对转鼓强度和刚度的影响不大。     

基于COSMOSWorks的碟式分离机转鼓体强度研究

介绍了碟式分离机的分离原理,并依据离心力场的基本特性,对碟式分离机中最主要的零件转鼓体进行受力分析,通过有限元分析软件COSMOSWorks对转鼓体进行静强度计算,得到转鼓体的应力水平,为转鼓体的结构优化设计提供依据。     

传统法和有限元法复杂转鼓强度分析及比较

虹吸式离心机转鼓是结构最复杂的离心机转鼓之一,随着离心机越来越大型化,大型复杂转鼓的强度设计要求越来越高.对某大型虹吸式离心机复杂转鼓组件进行强度分析.首先采用传统方法进行应力和变形分析,并利用MATLAB编程进行电算;然后通过有限元法三维实体建模,模拟出转鼓的复杂局部结构和边界条件,采用ANASYS软件对其应力和变形分布进行分析计算.结合两种方法的计算结果,对转鼓强度设计的合理性进行了较全面和深入地评估.同时,两种方法的计算结果的对比,也能在某种程度上保证分析方法的可靠性.这也为其它离心机转鼓强度设计提供了参考.     

全消光涤纶切片增黏工艺研究

以国望高科全消光涤纶切片为原料,通过切片质量、增黏升温工艺、转鼓真空度、转鼓转速、油泵压力及转鼓料位等工艺因素,对全消光涤纶切片转鼓增粘工艺进行研究.     

中国昊华化工(集团)总公司科技成果精选

转鼓结片机　　一、设备简介转鼓结片 (干燥 )机是硫化碱、铬酸酐、石油树脂、平平加、苯酐、顺酐等熔融物料结片及淀粉、磷酸盐、染料等浆液状物料干燥的关键设备。二、设备结构及工作原理转鼓结片 (干燥 )机由转鼓、刮刀系统、料盘、机架、机罩及传动系统等组成。转鼓是本设备的核心。转鼓结片是一个冷却结晶过程 ,料盘中熔融料液与冷却的转鼓接触 ,在转鼓表面形成料膜 ,通过料膜与鼓壁间的换热 ,使料膜冷却、结晶。结晶的料膜被刮刀刮下 ,成为片状产品。转鼓干燥是通过转动的转鼓 ,以热传导方式 ,将附在转鼓外壁的液相物料或带物料进行加…     

带加强箍离心机转鼓应力的有限元分析

用有限元法对具有不同过盈量的加强箍对离心机转鼓内应力的影响进行了分析比较。结果表明有过盈量的加强箍不仅为转鼓筒体承担部分载荷,而且因过盈在转鼓内产生预应力,在工作条件下可大幅度降低转鼓内的应力;对离心机转鼓合理设置加强箍、选择加强箍与筒体间的过盈量具有参考价值。     

大长径比卧螺离心机转鼓的有限元分析

利用SolidWorks Simulation有限元分析软件建立了大长径比卧螺离心机转鼓的有限元模型。在高转速下对其正常工作状态下的整体结构进行了模态和静态仿真分析,得到了转鼓的前5阶固有频率、应力分布和径向、轴向变形。结果表明原设计的卧螺离心机转鼓的强度和刚度均满足要求。将有限元分析结果与传统解析解进行比较,结果基本一致。改变转鼓约束面积和约束形式,对转鼓进行优化,寻求了最佳的转鼓轴颈直径;采用柔性支撑消除了主轴承刚度对最高转速的限制性影响,可以将转速提高到3 900 r/min。     

基于有限元法的卧螺离心机转鼓优化设计

对卧螺离心机的转鼓进行参数化建模,以这些参数为设计变量,以几何、强度和刚度要求为约束条件,以转鼓的转动惯量为目标函数,基于有限元分析计算,对转鼓结构的几何尺寸进行优化设计,取得了良好的效果。     

诌议水合机的进展

简述了搅拌浆叶式水合机、转筒式水合机和转鼓式水合机的结构、性能,认为转鼓式水合机较好。文中这对转鼓式水合机的工艺操作条件进行了讨论。     

三足离心机转鼓有限元应力分析与加强箍设计

对三足离心机转鼓采用有限元方法进行了应力分析,并进行了安全性评定。在此基础上,对转鼓加强箍的设置与结构进行了设计。     

转筒真空过滤机最佳转速的计算

研究了转筒真空过滤机的操作过程,导出的计算公式可以准确出生产能力达最大值时的转筒转速,对提高转筒真空过滤机的生产能力具有实用价值。附有计算举例。     

静电纺PLLA/PCL有序纤维的制备及性能研究

以三氯甲烷为溶剂,按聚乳酸(PLLA)/聚己内酯(PCL)质量比70/30配制质量分数3%的溶液进行静电纺丝,接收装置为转筒,电压为10 kV,接收距离为25 cm,推进速度为1.0 mL/h,制备PLLA/PCL有序纤维膜。通过对有序纤维膜进行扫描电镜、X射线衍射、动态力学性能以及力学性能测试,讨论了转筒的表面线速度对PLLA/PCL有序纤维膜性能的影响。结果表明:随着转筒表面线速度的增加,收集的有序纤维接近于平行排列,纤维的排列有序度提高;转筒表面线速度为3.75 m/s时,收集的有序纤维膜的晶粒尺寸及结晶度达到最大值,拉伸强度也达到最大值;转筒表面线速度大于3.75 m/s,收集的有序纤维膜的结晶度和晶粒尺寸减小,拉伸强度降低;转筒表面线速度为3.75 m/s时,得到的PLLA/PCL有序纤维膜的综合性能最好。     

Modeling and simulation of drying characteristics on flexible filamentous particles in rotary dryers

Experiments were conducted to demonstrate the effects of the drum wall temperature on the heat and mass transfer in rotary dryers. The drying characteristics of flexible filamentous particles in rotary dryers were further explored. In addition, the inlet and outlet temperatures and moisture contents of granular particles were measured. As a result, the good agreement between the simulations and experiments verified the rationale and feasibility of the numerical method. Therefore, the approach was adopted to evaluate the temperature and moisture content of wet granular particles in a rotary dryer in different conditions, for instance, drum wall temperature and rotational speed. The results revealed that the higher drum wall temperature led to hotter particles with lower outlet moisture content. Conversely, the higher rotational speed resulted in cooler particles with higher outlet moisture content due to the decrease of residence time in the rotary dryer.     

直热式转筒干燥过程物料停留时间理论推导

为了对物料在直热式转筒干燥机内理想扬料板作用下停留时间进行计算研究,根据扬料板作用下的物料在转筒内撒落分布均匀状态,建立了理想扬料板的截面方程,采用建立的理想扬料板的截面方程,导出了随着转筒转动到不同位置的扬料板持料量,在此基础上,分析物料在直热式转筒干燥机内的实际运动情况,建立转筒内物料运动的数学模型,导出物料在转筒内的停留时间,对现有停留时间计算方法进行了修正。研究为扬料板作用下直热式转筒干燥过程物料停留时间的计算提供一种参考。     

双转鼓流化工艺大颗粒尿素生产运行总结

介绍了双转鼓流化床大颗粒尿素生产工艺流程、物化过程机理、工艺特点等,简述了原材料及动力供应、设备配置及投资情况,针对实际中出现的造粒转鼓电机负荷不足、尿素抄斗设计不合理、排出尿素粉尘含量高等问题,提出了相应的改进措施,改造后生产运行平稳,产量提高,运转周期延长,粒度Φ2mm～Φ4mm尿素≥98%。     

FLIGHT DESIGN I N ROTARY DRYERS

The effectiveness of the rotary drum drying process depends primarily on the contact between the cascading particles and the drying gases within the drum. This paper considers first the factors which contribute to the cascade pattern and which influence the design of the lifting flights which distribute the particles in the top half of the drum. A generalised calculation design procedure for flights is developed and described in detail for the case of Equal Horizontal Distribution (EHD) flights. It is reasoned that the EHD flights, which have an equal distribution of particles across the horizontal diameter of the rotary drum dryer, give the optimum distribution in the context of the heat and mass transfer operations of the rotary drying process. An industrial design which approximates the optimum flight design is suggested.     

FLIGHT DESIGN I N ROTARY DRYERS

ABSTRACT

The effectiveness of the rotary drum drying process depends primarily on the contact between the cascading particles and the drying gases within the drum. This paper considers first the factors which contribute to the cascade pattern and which influence the design of the lifting flights which distribute the particles in the top half of the drum. A generalised calculation design procedure for flights is developed and described in detail for the case of Equal Horizontal Distribution (EHD) flights. It is reasoned that the EHD flights, which have an equal distribution of particles across the horizontal diameter of the rotary drum dryer, give the optimum distribution in the context of the heat and mass transfer operations of the rotary drying process. An industrial design which approximates the optimum flight design is suggested.     

THREE-ARC LIFTING FLIGHT

现有转筒烘干机的抄板不能把料撒在整个转筒内 ,而且撒料也不合理 .用力学理论和实验结合得出的三弧抄板克服了这些缺点 ,并且填充率高 (>2 0 % ) .如果用于工业生产 ,必将有显著的节能效果 .     

三弧抄板

现有转筒烘干机的抄板不能把料撒在整个转筒内 ,而且撒料也不合理 .用力学理论和实验结合得出的三弧抄板克服了这些缺点 ,并且填充率高 (>2 0 % ) .如果用于工业生产 ,必将有显著的节能效果 .     

Sealing of Rotary Drums for Operation Under Pressurized Conditions

In practice, rotary drums are usually designed for operation under vacuum conditions. In this paper, a novel technique is proposed for sealing the rotary drums under pressurized operating conditions. The proposed system is based on applying a secondary pressurized volume around the leaking gap of the drum. By maintaining the pressure of this volume a little above the pressure of the drum, it is possible to prevent leakage of gases to the ambient environment. The objective of the controller in this system is to keep the pressure of the secondary volume above the pressure level of the drum, independent of the disturbances, which may exerted on the system by the wind outside the drum. The control system is also required to trace the variations in the drum pressure, with the least fluctuations in the pressure difference between the drum and the volume.