离心泵的故障原因及排除方法

车间泵类主要为离心泵,其检修频率和检修费用都比较高。介绍了离心泵的工作原理,分析了离心泵故障产生的原因,提出了相应的故障排除方法。     

新型填料密封在离心泵上的应用

介绍了一种新型填料密封的密封原理、特点和在离心泵中的使用方法，应用表明采用该填料密封可节省能源，减少维修费用。     

Electrodiffusional flow diagnostics in a centrifugal pump

This paper presents electrodiffusional measurements of the wall shear rate at the impeller surface of a radial centrifugal pump. Twelve probes of different radii and at different positions along one blade were used in a pump with an open six bladed impeller. By means of throttling and speed control the operating point of the pump was adjusted and the influence on the wall shear rate was studied. The measurements were related to the analytical solution for a free rotating disc and the shear gradients were in the same order of magnitude.     

多级离心泵设计使用维修技术要点

简述了多级离心泵的基本结构,从设计、使用与维护、拆卸与维修等方面探讨和总结了多级离心泵的关键技术、常见问题和改进措施。     

离心泵性能参数的自动测定和自动控制

通过将计算机技术应用于离心泵性能参数的研究，实现了离心泵性能参数的自动测定和自动控制。     

中比转数离心泵内部流场的三维数值模拟

基于全三维不可压缩雷诺时均方程和RNGk-ε湍流模型,采用压力-速度隐式修正SIMPLEC算法,应用FLUENT软件中提供的多重参考系模型(MRF),对具有扭曲叶片的中比转数离心泵内三维不可压缩湍流流动进行数值模拟,探讨泵流道内的压力及速度分布规律,揭示泵内的回流、高速、高压流动现象.结果表明:扭曲形叶片汽蚀性能较好,但靠近隔舌流道内的回流、叶片流道内的局部高速和高压流场会影响离心泵效率,对隔舌和叶轮叶片结构进行优化是提高中比转数离心泵效率的途径之一.     

液氯离心泵的气蚀与防治

分析了影响液氯离心泵气蚀的两种参数：允许吸上真空度、气蚀余量。提出了泵气蚀的防治措施：提高离心泵基础设计质量,在实际使用中应采用高分子聚合材料涂覆,并进行补焊、补气。     

延迟焦化装置辐射进料泵改造

针对吉林石化炼油厂延迟焦化装置辐射进料泵的运行工况,通过对泵的叶轮改造,节电量达到110kw/h,泵出口压力由4.2MPa降低到3.OMPa,降低了介质对系统管线、设备的冲蚀,设备使用寿命延长,可实现综合创效68万元/a以上,在提高装置长周期安全运行系数的同时,取得了较明显的经济效益.本成果对同类装置的节能改造具有重要...     

PVC干燥离心母液系统改造

通过对离心母液系统改造,保证了设备长周期稳定运行,减少了维修及工艺操作工作量,创造了经济效益。     

Performance analysis of a new type desalination unit of heat pump with humidification and dehumidification

Desalination with humidification and dehumidification process is deemed as an efficient and promising means of utilizing the condenser and evaporator of heat pump to produce freshwater from seawater. This paper presents a new type desalination unit driven by mechanical vapor compression pump which was designed and fabricated by the Institute of Air-Conditioning & Solar Energy of the Northwestern Polytechnical University. The unit utilized the heat from condenser and the cold from evaporator of heat pump adequately, and reclaimed most latent heat. The air, firstly, was humidified in the humidifier with the alveolate structure, and then was cooled in the precondenser and the evaporative condenser to produce freshwater. A mathematical model of the unit is presented, in which the hydrokinetics method was used to study the flow and the heat and mass transfer inside the alveolate humidifier. The effects of some of the operation such as flow rates, temperatures of cooling water and air, and etc., were studied in detail. The comparison between the numerical and experimental results was accepted. The desalination unit that is considered in the study produces freshwater 60 kg/day with the less electric power that is 500W and is proven to be an efficient desalination device to obtain freshwater.     

浅析干气密封及其在离心泵上的应用

介绍干气密封的结构、工作原理、优越性,以及在离心泵轴封领域的应用情况和前景。     

离心泵气蚀的预防

分析了离心泵产生气蚀的机理、危害,讨论了预防气蚀的理论措施,并结合实际应用情况,对设计、维修和操作中应当采取的具体预防措施进行了一定的探讨。     

离心转子式选粉机的分级机理

对气相中固体颗粒的受力情况进行了分析 ,并在此基础上介绍了离心转子式选粉机的结构及工作原理 ;从理论上分析了选粉机的分级机理 ,推导了切割粒径的计算公式 ;通过模型实验 ,探讨了操作参数对选粉机分级性能的影响规律。结果表明 ,该选粉机具有良好的分级性能 ,其理论分析对选粉机的设计及性能预测具有一定的指导意义。     

自吸泵控制回路的改进

针对使用离心泵时产生的问题,基于离心泵自身的使用特点,结合使用环境,对其控制回路进行了改进,实现了离心泵的保护,延长了检修周期。     

Improving Suction Performance of Centrifugal Pumps by Using Jetting Device

Improving the suction performance of centrifugal pumps by using jetting device is presented. The theoretical analysis, experimental study and engineering implementation show that suction performance of centrifugal pump can be improved with jetting device and be used for delivering the liquid media requiring high suction performance, whereas the efficiency and head of the pump will decrease a little. The effect of feed-back jetting on suction performance is the most obvious at design point. The suitable rate of feed-back flow is 2%-5%.     

Numerical prediction of dust capture efficiency of a centrifugal wet scrubber

The gas, liquid, and dust particle behavior inside a centrifugal wet scrubber was simulated and a submodel for predicting its collection efficiency was developed that also takes in account the reduction in collection efficiency due to droplet carryover. Centrifugal wet scrubbers are used in many industries and deliver a high scrubbing efficiency at relatively low capital and operational costs. However, they often experience problems such as droplet carryover at high gas flows and reduced collection efficiency at low gas flows. An improved understanding of flow processes inside the scrubbers is needed to develop a better scrubber design. An experimental test facility was setup for this purpose which also served to validate the CFD modeling results. Ideal operating parameters for maximum scrubbing efficiency and minimum droplet carryover were identified. © 2017 American Institute of Chemical Engineers AIChE J, 64: 1001–1012, 2018     

离心泵机械密封失效的原因及解决方案

分析了氯碱装置中离心泵机械密封失效的形式及主要原因（即腐蚀失效、热损失效、摩擦失效）,并提出了相应的解决方案。     

PVC离心母液水的回收利用

对PVC离心母液水的产生、特性及处理方法进行了阐述,重点介绍了膜法回收处理装置过滤技术,采用该技术改造后的装置运行稳定,回收利用率高,实现了环保节能双收益。     

国产离心式氯气压缩机的使用情况

简述了离心式氯气压缩机的工作原理、结构性能、辅助系统及维护使用情况。     

加装诱导轮改善离心泵抗汽蚀性能

通过对离心泵汽蚀现象的分析和改善离心泵抗汽蚀性能的几个方案的比较,在不影响正常生产的前提下,解决机泵的汽蚀问题应首选在其人口加装诱导轮。经实际改造后,取得良好效果。