丙烯塔进料泵改进设计

丙烯塔进料泵是流程中关键泵,是低比速小流量高扬程泵。由于该泵技术要求高,使用条件严酷,运行中事故频发,导致泵严重损坏,造成停产。本文对原泵出现时的问题逐一进行分析,提出了6个关键技术问题的解决措施。并改造设计新型泵,经三个月运行考核效果显著,完全适应工程的需要。     

羟胺进料泵故障分析及解决措施

介绍了羟胺进料泵使用情况，通过对故障分析，提出了解决故障的措施。     

焦化汽油加氢进料泵振动分析

两台刚投产的50万t/年焦化汽油加氢装置进料泵出现振动超标现象,采用状态监测技术对其进行故障诊断,找到振动原因并加以消除。     

原料油进料泵管线振动的故障诊断与治理

经过管道振动信号和流体压力脉动信号的测试结果，分析了高压离心进料泵引起管线振动的原因并提出了相应的改进措施。     

二甲苯塔底泵P212振动超标原因分析

针对某新建连续重整装置二甲苯塔底泵P212在开工试车过程中反复出现泵振动超标的现象,对其异常振动经过多次分析、试验,查出了故障的确切原因,并及时实施了有效的处理措施,从而提高了设备运行的可靠度,保证装置的平稳长周期运行.     

重整预加氢进料泵技术改造

针对一台抽送塔底轻质汽油的离心泵投入运行来的严重振动问题进行分析、研究,最后确定重新设计一台泵。论述了分析结论的由来以及采用新泵的实效、新泵的设计方法等。     

反应器进料泵机械密封失效原因分析及改造

通过对茂名乙烯公司环氧乙烷／乙二醇装置反应器进料泵机械密封主要设计参数的校核计算，分析了该泵机械密封失效的原因，提出了密封改造方案，在实际应用中取得了较好效果。     

粗选泡沫泵振动汽蚀原因分析及解决方案

针对山西某铁选厂粗选泡沫泵产生汽蚀进行了原因分析,提出了解决方案,可为解决类似问题提供借鉴。     

立式泵振动分析及结构改进

KSB公司出口海外某项目的多台立式中开泵,在现场变频调试运行时出现振动超标问题,影响了泵组的正常使用。运用ANSYS软件对泵组进行模态分析,判断振动原因是泵组存在共振问题。通过对电机座结构进行改进,降低了泵组的固有频率,使其避开共振频率范围,从而减小了泵组的振动。     

PTA反应器进料泵低速组件失效分析

对扬子石化股份有限公司精对苯二甲酸（PTA）装置反应器进料泵齿轮断齿原因进行失效分析。结果说明由于滚珠转动不灵活造成滚动轴承接触面产生接触疲劳剥落，间隙和径向跳动加大，引起齿轮偏载，导致疲劳断齿。     

微机械往复式无阀泵的振动特性分析

提出了用于研究微机械往复无阀泵动态特性的二自由度振动力学模型,并进行了分析与实验验证.在模型中增加考虑泵腔内气泡因素,并将泵腔内、外液体质量的影响分开考虑;得出振幅随频率、泵腔内外液体质量比变化的曲线;发现其幅频曲线一般呈双峰特性,泵腔内外液体质量比值对曲线特征、谐振频率、振幅均有显著影响.通过实验验证了分析结果.由此得出以提高泵压为目的的微泵优化设计策略适当增大膜片质量、选择合理的泵腔内外液体质量比值.采用硅深刻蚀、硅-玻璃膜片键合等工艺制作出微机械往复无阀泵,其尺寸为20 mm×20 mm×0.65 mm,实现最大泵压为1.52 kPa,对应最大流量为35×10-6 L/min.     

氯化钙溶液环境下单螺杆泵定子材料的损伤研究

单螺杆泵定子材料的损伤对单螺杆泵的使用寿命至关重要.本文以单螺杆泵定子常用材料丁腈橡胶(NBR)为对象,研究其浸泡在不同浓度氯化钙(CaCl2)溶液环境下的损伤情况.采用拉伸试验和Shore A硬度研究NBR的机械性能变化,采用重量损失法研究NBR的重量损失情况,采用衰减全反射傅里叶变换红外光谱技术(ATR-FTIR)...     

尿素水解塔给料泵的检修和改造

介绍了进口水解墙给料的结构特点，并针对其故障原因进行了分析，提出了解决措施。     

FO/23B塔式起重机的故障诊断与处理

FO／23B塔式起重机(以下简称塔机)是1种臂长50m，机高65m，具有高压小流量液压系统的特大型塔机。该机在试验和使用过程中，曾出现过2次比较典型的故障。由于其上下运动的活动塔架重达20t有余，若出现故障，后果将非常严重。     

Energy dissipation of a vibrating Timoshenko beam considering support and material damping

This paper studies the effect of boundary conditions, via end-fixity and damping, on the overall damping capacity of a flexibly supported cantilever under the condition of steady-state vibrations. The effect of the beam's length to depth ratio is accounted for through the use of Timoshenko beam theory. The cases of a cantilever having a flexible viscously damped support and a cantilever-support system having a combination of structural support damping and beam material damping are focused upon. Comparisons are made with the results of other investigators.     

MC50水解塔给料泵事故分析

我厂尿素装置开车过程中水解解析系统一直未顺利生产，原因是MC50泵事故频繁，经认真研究查明了事故原因，找到了解决问题的办法。     

减压塔底泵机封设计的几点体会

针对减压塔底泵机械密封的工况条件及故障原因,设计采用平衡型静止式焊接金属波纹管密封。阐述了该密封具有的特点、设计要点及实际应用的良好效果。     

Adsorption of fatty acids from alkane solution studied with quartz crystal microbalance

This paper describes the adsorption of the unsaturated fatty acids, oleic-, linoleic-, and linolenic acid onto steel coated quartz crystal surfaces from 2,2,4,4,6,8,8-heptamethylnonane as monitored by the quartz crystal microbalance (QCM) technique. It is shown that addition of fatty acid to the oil results in changes in bulk density and viscosity and that these changes must be considered before the sensed mass can be evaluated. The change in viscosity of the solution is larger for oleic acid than for linoleic acid and linolenic acid, which results in a larger correction for oleic acid with respect to bulk effects. After considering the effects due to changes in bulk properties, the influence of the viscoelastic properties of the adsorbed layer on the sensed mass was evaluated. The correction for the viscoelastic properties of the adsorbed layer was found to be very small for the systems studied. The sensed mass, at 1.1 weight percent, ranged from 0.5 mg/m² for oleic acid to 5 mg/m² for linolenic acid.     

松散物料在水平圆振动干燥机中的运动分析

依据流体力学和振动学的基本原理,建立物料在水平圆振动干燥机中的运行方程,得出物料在单层孔板上运行周期及时间表达式.并通过该方程的电算方法得到物料运行任意位置所需时间,经实际验证模拟值与实测值吻合较好.     

Near field optical microscopy in aqueous solution: implementation and characterization of a vibrating probe

Near field optical microscopy (NSOM) is one of the possible solutions to circumvent the diffraction limit, but the control of the optical probe in solution has been a technical challenge for practical applications. Most recently, it has been shown that the pipette used in the scanning ion conductance microscope can be modified to form a high resolution near field optical probe. When combined with a novel distance modulation mechanism, a robust near field microscope can be constructed for operation in aqueous solution. In this paper, we present technical details of this design and a further characterization of the NSOM system for imaging in solution. Fundamental limitations of this approach in comparison to other systems are also discussed. Based on the current technology, it is concluded that better than 50 nm resolution should be achievable with this technique for fluorescence, as well as fluorescence resonance energy transfer, imaging of biological specimens.