共查询到20条相似文献,搜索用时 500 毫秒
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介绍烟气脱硫技术的典型工艺,即湿法石灰石-石膏烟气脱硫工艺和循环硫化床(干式)烟气脱硫技术。论述脱硫系统用泵和机械密封的特点。提出了烟气脱流系统用泵国产化对策。 相似文献
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非对称泵控装载机动臂特性研究 总被引:1,自引:0,他引:1
装载机通常采用阀控液压系统驱动动臂升降,上升过程积累了大量的动臂重力势能,在下降过程中经液压系统节流口节流作用耗散到环境中,频繁的升降过程产生了大量节流和溢流损耗,造成了系统发热与能量浪费.为消除液压系统的溢流与节流损失,提出采用闭式泵控原理驱动动臂单出杆液压缸;为平衡液压系统中单出杆液压缸的不对称流量和回收利用动臂的重力势能,提出含有三个配流窗口的非对称泵为闭式泵控液压系统供油.在非对称泵中,其中一个配流窗口与蓄能器相连,动臂下降阶段用于回收动臂重力势能,上升阶段与另外一个配流窗口共同为液压缸无杆腔供油,第三个配流窗口则与液压缸有杆腔相连.研究中,分析所提系统的工作原理,建立联合仿真模型,构建所提系统的试验平台,对所提系统的工作和能耗特性进行试验研究.试验结果表明,所提系统可平衡由闭式泵控单出杆液压缸造成的非对称流量,并实现动臂重力势能的回收,与原有阀控系统相比,最高可降低系统能耗47.19%. 相似文献
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基于泵控泵(PCP)技术的一控三泵控泵注水泵站系统,综合应用摘段调节、变速调节和泵的串联改变注水系统的特性曲线,使大功率多级高压离心泵始终在高效区工作,实现注水泵输出压力和流量可调,能达到节能降耗的目的并实现多种工况组合备用。实际应用表明,该系统降低了泵管压差和注水电耗,提高了注水效率,有效地解决了油田注水电耗大的问题。 相似文献
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介绍衬塑泵在化工流程中的应用现状,阐述高分子氟塑料材料的耐腐蚀性能、耐高低温性能以及耐磨性能等优缺点。对衬塑泵过流部件的水力设计及其衬里氟塑料材料的成型工艺进行了研究和分析,概述了衬塑泵在设计、工艺、实用性方面的特点。列举了在衬塑工艺过程中易出现的问题,并提出解决方法。 相似文献
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数字化无阀微泵的泵送性能实验研究 总被引:1,自引:0,他引:1
研制出一种新型的基于微流体数字化技术的数字化无阀微泵,并对无阀微泵的泵送性能进行实验研究。该微泵泵送出的液体量微小、可控,可达纳升级。针对不同粘度液体,改进驱控参数,实现了连续流、离散流的泵送。实验验证了设计原理的正确性。 相似文献
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电液伺服泵控单元是容积伺服一体化电液系统的重要组成部分,由伺服电机与双向闭式泵集成于一体。电液伺服泵控单元作为整个系统的动力输入与控制单元,其自身的传递效率直接影响了系统的输出效率,所以电液伺服泵控单元的能量传递效率已经成为了衡量该系统性能的一个重要指标。通过建立容积伺服一体化电液系统数学模型,重点分析影响伺服电机与双向闭式泵传递效率的各种能量损耗,得到电液伺服泵控单元效率模型,并对电液伺服泵控单元在不同负载工况下进行了效率特性测试,将为容积伺服一体化电液系统的工程推广应用奠定基础。 相似文献
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旋流泵的研究现状及发展趋势 总被引:2,自引:0,他引:2
《流体机械》2016,(9):36-40
旋流泵的无堵塞特性使得其在化工、制药、造纸以及污水处理等行业中得到了广泛的应用。本文对旋流泵的基本工作原理和内部流动特性进行了分析,总结了国内外旋流泵的研究历史及目前研究现状,结合各国学者提出的几种经典的流动模型,由此给出分析旋流泵设计中存在的问题,为今后一个阶段内旋流泵的研究热点和发展方向提供参考。 相似文献
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超洁净制造的研究与发展* 总被引:4,自引:0,他引:4
制造学科是随着科学的演进和技术的进步不断地发展和变化的一个学科。结合激光聚变、电子制造、航空航天以及医疗器械等领域对洁净的需求,首次提出了超洁净制造的新概念,并对超洁净制造的内涵进行了界定。在上述相关领域中,表面污染物的演化和演变将对器件的性能和功能产生重要的影响。采用制造领域的新方法和新手段获得超洁净表面,并实现其工作时超洁净状态的维持是制约上述领域发展的瓶颈问题。在综合分析超洁净制造应用领域的基础上,提出超洁净制造基础理论和关键技术研究所面临的挑战,分析超洁净制造的技术内涵和研究内容,并针对相关领域中高洁净度的获得和保持技术进行了剖析。最后,提出超洁净制造未来发展的科学问题。旨在通过超洁净制造的研究为制造科学与工程提供新的发展思路,拓展并提升其应用的领域,服务于重大科学工程和重要技术领域的发展。 相似文献
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ZHANG Bin XU Bing XIA Chunlin YANG Huayong 《机械工程学报(英文版)》2009,22(1):84-90
A particular emphasis is placed on the virtual prototype technology (VPT) of axial piston pump. With this technology it is convenient and flexible to build a complicated 3D virtual based on real physical model. The actual kinematics pairs of the parts were added on the model. The fluid characters were calculated by hydraulic software. The shape of the parts, the flexible body of parts, etc were improved in this prototype. So the virtual prototype of piston pump can work in computer like a real piston pump, and the flow ripple, pressure pulsation, motion principle, stress of parts, etc can be investigated. The development of the VPT is introduced at the beginning, and the modeling process of the virtual prototype is explained. Then a special emphasis is laid on the relationship between the dynamics model and the hydraulic model, and the simulations on the flow ripple, pressure pulsation, motion principle, the stress and strain distribution of the middle shaft and piston are operated. Finally, the advantages and disadvantages of the VPT are discussed. The improved virtual prototype of piston pump more tally with the real situation and the VPT has a great potential in simulation on hydraulic components. 相似文献
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Computational analysis of centrifugal pump delivering solid-liquid two-phase flow during startup period 总被引:1,自引:0,他引:1
The transient behavior of centrifugal pumps during transient operating periods, such as startup and stopping, has drawn more and more attention recently because of urgent needs in engineering. Up to now, almost all the existing studies on this behavior are limited to using water as working fluid. The study on the transient behavior related to solid-liquid two-phase flow has not been seen yet. In order to explore the transient characteristics of a high specific-speed centrifugal pump during startup period delivering the pure water and solid-liquid two-phase flow, the transient flows inside the pump are numerically simulated using the dynamic mesh method. The variable rotational speed and flow rate with time obtained from experiment are best fitted as the function of time, and are written into computational fluid dynamics (CFD) code-FLUENT by using a user defined function. The predicted heads are compared with experimental results when pumping pure water. The results show that the difference in the transient performance during startup period is very obvious between water and solid-liquid two-phase flow during the later stage of startup process. Moreover, the time for the solid-liquid two-phase flow to achieve a stable condition is longer than that for water. The solid-liquid two-phase flow results in a higher impeller shaft power, a larger dynamic reaction force, a more violent fluctuation in pressure and a reduced stable pressure rise comparing with water. The research may be useful to tmderstanding on the transient behavior of a centrifugal pump under a solid-liquid two-phase flow during startup period. 相似文献
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