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穆道彬 《中国石油和化工标准与质量》2023,(10):113-115
环管轴流泵是应用在聚丙烯装置上特殊用途的泵,固液气介质特性决定了轴流泵设计研究的特殊性,导叶改变着流体内部流动方向,导叶结构参数的设计研究尤为重要。应用流体数值模拟软件对两种导叶数、相同叶轮的不同流量进行内外特性的研究,采用SST湍流模型,首先模拟两种导叶数在0.2~1.4Q t流量的外特性,结果显示七叶片导叶的泵性能优于五叶片导叶的泵;同时对两种导叶数的导叶进行内特性研究,通过出口断面压力和出口断面流线模拟分析,导叶片数对泵水力性能影响很大,采用七叶片导叶的泵内部流动平稳,水力损失小,效率更高;内外特性分析研究表明,相同性能参数相同叶轮的条件下选取七叶片导叶水力性能更佳。本文的研究对环管轴流泵的设计应用具有借鉴意义。 相似文献
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确定了MHP100-125化工泵的主要参数和结构方案,对泵的叶轮进行了水力设计,确定了其水力尺寸。水力设计时主要采用速度系数法。结果表明,设计出的化工泵产品的水力性能达到了预期目标,且提高了其先进性与合理性。 相似文献
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《化工矿物与加工》2018,(12)
常规浮选机的机械搅拌装置采用一个转子(叶轮)配一个定子的1+1结构模式,很难保证浮选机既有足够的充气量,又能产生矿物分选所需的静态流分选环境。为此,通过将离心叶轮与搅拌叶轮有机地结合起来,设计了一种2+1结构模式的双叶轮控制系统浮选机。试验表明:浮选机的发泡和矿化性能可以用离心叶轮来调控,矿浆悬浮分散性能可以用搅拌叶轮来调控。离心叶轮的水力空化强度越大,浮选机的发泡和矿化性能越好,相应的浮选效率也越高。矿浆悬浮分散状态与搅拌叶轮的结构特征有关,影响搅拌叶轮临界悬浮转速最主要的因素是叶轮直径和叶片倾角。通过用细粒难选胶磷矿进行浮选对比试验,发现双叶轮控制系统浮选机具有较好的浮选性能,与常规机械搅拌自吸式浮选机相比,浮选精矿的P2O5品位、回收率、选矿效率分别可以提高3.42%、7.21%、9.68%。 相似文献
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本文化述了旋喷泵的理论扬程即是叶轮的理论扬程。根据旋喷泵扬程-流量曲线特点,提出了旋喷泵叶轮的优化设计数学模型、叶轮优化设计方法及水力参数的设计原则。依此方法,进行了实例计算,结果表明本方法切实可行。 相似文献
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以比转数为43的低温高速液氮离心泵为例阐述了间歇工作的低温离心泵的结构设计和水力设计方法。结构上采用金属波纹管密封和聚氨酯同步齿形带传动等结构形式,理论上采用复合叶轮的优化水力设计方法。经水力试验和现场应用表明,本文提出的结构方案和水力设计方法是合理可行的。 相似文献
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大型风机振动值大于标准规定值时,须及时对转子做动平衡。根据动平衡原理,对德国生产的D1200风机半开式叶轮转子做动平衡,现场用1台简单测振仪通过多圆作图法求得在叶轮上所需加减配重量及位置,使风机振动值小于其标准规定值。风机运行18个月,仍处于良好状态。此方法适用于转子出口宽度与叶轮直径比值为1∶(8~10)的转子,转子叶轮不受型式影响,只需简单测振仪,大大节约时间和费用,而且平衡精度高。特别适用于高转速、高功率大型风机在生产现场做动平衡。此方法有工程应用价值,值得广泛推广。 相似文献
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本文就某装置中两开一备布置的泵进出口管道的布置和支架设置进行阐述,其应力结果中泵嘴子受力和力矩满足API Std610的要求,并提出会出现的问题及处理的方法。为今后类似布置的泵的管道设计提供参考依据。 相似文献
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Marcos R. M. Penteado Saon C. Vieira Marcelo S. de Castro Antonio C. Bannwart 《American Institute of Chemical Engineers》2022,68(2):e17448
Centrifugal pumps are used in several industrial processes. It is common the operation of this equipment with gas–liquid mixtures, which is the case of the electrical submersible pumping artificial lift method used in the oil industry. The increase of free gas fraction inside the pump may lead to unstable operation and problems such as surging and gas locking phenomena to occur. In this study a drift-flux model is proposed for the gas–liquid flow subjected to centrifugal fields using the impeller as an example. The model is closed with experimental data of bubble diameter, displacements and velocities acquired via high-speed camera at several different rotational speeds and gas mass flow rates using water as the continuous medium. From the modeling and the forces balance in the bubbles, quantitative criteria for the start point of surging and gas locking conditions were proposed. 相似文献
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Philipp Schmitt Stephan Sibirtsev Mark W. Hlawitschka Robert Styn Andreas Jupke Hans-Jörg Bart 《化学,工程师,技术》2021,93(1-2):129-142
The generation of liquid-liquid dispersions with defined droplet size distributions is an important aspect for process equipment design. In this work, two centrifugal pumps with different impeller diameters were used to generate dispersions at selected operating points for a paraffin oil-water system. The droplet break-up phenomena within the centrifugal pumps were analyzed using a transparent pump design in combination with high-speed imaging. Droplet size distributions at centrifugal pump discharge nozzle were recorded with optical probe measurement technologies and evaluated by means of image processing using a neural network. The influence of impeller diameter, rotational speed, volumetric flow rate and dispersed phase fraction are discussed. Experimental data is correlated using fluid properties, operating data as well as centrifugal pump dimensions. The correlations developed from results of this work serve as a basis for the equipment design of centrifugal pumps. 相似文献
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该文介绍了智能电液执行装置在水厂、泵站出水阀门上的应用及创新驱动供水行业水厂及泵站在节能降耗方面的新思路。改变自来水厂二泵房和泵站出水管路上设置单向阀的传统规范设计,由智能电液执行装置所控制的阀门来替代。在出水管路上省去一个单向阀,减少了出水管路上的水头损失,符合设计要求、运行安全,是一项有效的节能措施。 相似文献
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Balamurugan Manavalan Niranjan K. Pandey Shekhar Kumar Kamachi U. Mudali Jyeshtharaj B. Joshi 《加拿大化工杂志》2018,96(1):62-67
The main selection criterion for pumps in reprocessing applications is the absence of any moving parts or the moving parts not having any direct contact with the process fluid. There are different types of fluidic pumps such as vortex diode, reverse flow diode, etc. In this work, a new design of helical coil fluidic pump has been developed and demonstrated. Helical coils are widely used in process industries as heat exchangers, reactors, motionless mixers, etc. It is for the first time that the authors are proposing the use of helical coil as a fluidic pump based on its inherent property of high pressure drop as compared to a straight tube. The main objective of this work is to develop an alternate pumping system for reprocessing applications to replace the conventional air lift pump. The helical coil based fluidic diode pump was made up of SS 304 seamless pipe (pipe inner diameter is 9.5 mm) with a 36 mm diameter of helical coil and pitch of 14 mm. In this work, friction factor for the given helical coil was measured from pressure drop experiments. This information was also useful for understanding the transition of the laminar to turbulent region. In order to propose the operating region, the pumping capacity was measured for the helical coil based fluidic pump at different operating conditions. Experimental results show that the proposed hardware is able to pump up to 54 dm3/h. Recommendations have been made for proposing an optimum design. 相似文献
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概述卧式中开多级泵的结构特点,通过KHP系列泵的部分设计实例及样机的试验结果分析,提出了卧式中开多级泵在结构方面的设计注意事项,叶轮水力尺寸方面的设计方法。 相似文献