Analysis and experimental study on resistance-increasing behavior of composite high efficiency autonomous inflow control device

Bottom water coning is the main reason to reduce the recovery of horizontal bottom water reservoir. By water coning, we mean the oil-water interface changes from a horizontal state to a mound-shaped cone and breaks through to the wellbore. Autonomous inflow control device(AICD) is an important instrument maintain normal production after bottom water coning, however, the resistance increasing ability of the swirl type AICD is insufficient at present, which seriously affects the water control effect. Aiming this problem, this paper designs a multi-stage resistance-increasing and composite type AICD. The separation mechanism of oil-water two phases in this structure, the resistance form of oil-water single phase and the resistance-increasing principle of water phase are analyzed. Establishing the dual-phase multi-stage separation and resistance-increasing model, and verified by measuring the throttling pressure drop and oil-water volume fraction of the AICD, it is found that the composite type AICD has the effect of ICD and AICD at the same time, which can balance the production rate of each well section at the initial stage of production, delay the occurrence of bottom water coning. In the middle and later stages of production, water-blocking can be effectively increased to achieve water control and stable production.After structural sensitivity analysis, the influence law of various structural parameters on the water control performance of composite AICD was obtained. The simulation calculation results show that,compared with the existing swirl type AICD, composite AICD has higher sensitivity to moisture content,the water phase throttling pressure drop is increased by 4.5 times on average. The composite AICD is suitable for the entire stage of horizontal well production.

Spiral Torsion Spring Optimization Design for Separation Devices

As a driving element,the spiral torsion spring can control the release velocity by the optimization design of spring parameters and be used for separation devices,which is conducive to unlocking synchronicity and low-shock of the separation. On the basis of analyzing the performance requirements of the spiral torsion spring in a spacecraft device,the optimization design model of the spiral torsion spring is given, which takes the spiral torsion spring's length,width and thickness as the optimization variables,and the minimum volume as the optimization objective. The model considers output torque,strength,the maximal resetting load,holding force,and low shock as constraint conditions. A case is given to analyze the proposed model. The analysis results show the optimization scheme decreases the volume of the spiral torsion spring and meets the performance requirements of the separation device.

Influence of preload discreteness on air-operated separation process of low-shock separation device

To investigate the influence of design parameters on the performance of separation device,the structure and air-operated test of a low-shock separation device are introduced and analyzed in this paper.According to the law of energy conservation and aerodynamics,a mathematical model is built.Because the preload used to ensure the connection reliability has the discreteness,which will influence the separation process,the influence of preload discreteness on the air-operated separation process is simulated and tested.Simulation results are consistent with the experimental results.It is shown that the change of preload has an obvious influence on the separation process.The study is useful for the design and optimization of separation device.

The Development of Memory Alloy Satellite-Rocket Separation Device for Commercial Small Satellites

Non-pyrotechnic separation devices have been fully recognized for their high performance and high reliability.The focus of this paper is mainly around the development of memory alloy satellite and rocket separation devices.Due to the increasing demand for small-sized rockets and satellites,some suggestions and experiments for developing this new type of non-pyrotechnic device are proposed and conducted.

Droplets Turbulence Effect of Gas-Water Separator with Corrugated Plates

Droplet turbulence effect on gas-water separator with corrugated plates is explored using the Eulerian-Lagrangian two-way coupled multiphase approach of FLUENT. It is concluded that the inertial force is dominant in separating large droplets, while droplet turbulence dispersion plays a decisive role in separating fine droplets. Good agreement exists between calculations and air-water experiments. The numerical method developed provides a rea-sonable description of the droplet trajectories and separating efficiency, and it can be applied to predicting the performance of gas-water separator with corrugated plates.

Dynamic resistive switching in a three-terminal device based on phase separated manganites

A three-terminal device based on electronic phase separated manganites is suggested to produce high performance resistive switching. Our Monte Carlo simulations reveal that the conductive filaments can be formed/annihilated by reshaping the ferromagnetic metal phase domains with two cross-oriented switching voltages. Besides, by controlling the high resistance state（HRS） to a stable state that just after the filament is ruptured, the resistive switching remains stable and reversible, while the switching voltage and the switching time can be greatly reduced.

Experimental Study on the Performance of an Onboard Hollow-Fiber-Membrane Air Separation Module

Onboard air separation devices,based on hollow fiber membranes,are traditionally used for the optimization of aircraft fuel tank inerting systems.In the present study,a set of tests have been designed and executed to assess the air separation performances of these systems for different air inlet temperatures(70°C∼110°C),inlet pressures(0.1∼0.4 MPa),volume flow rates of nitrogen-enriched air(NEA)(30∼120 L/min)and flight altitudes(1.5∼18 km).In particular,the temperature,pressure,volume flow rate,and oxygen concentration of air,NEA and oxygen-enriched air(OEA)have been measured.The experimental results show that the oxygen concentration of NEA,air separation coefficient,and nitrogen utilization coefficient decrease with the rising of air inlet temperature,air inlet pressure,and flight altitude.The effect of air inlet pressure on the above three parameters is significant,while the influence of air inlet temperature and flight altitude is relatively small.

New finding on out-of-step separation configuration of large-scale power systems

In this paper,two new concepts—“main out-of-step mode” and “minor out-of-step mode”—are proposed for power system reliability analysis. Large-scale power system studies found that out-of-step generator groups may have characteristics of the main out-of-step mode and the minor out-of-step mode. The generator groups with main out-of-step modes can determine the out-of-step interface of the large-scale power system,while generators with the minor out-of-step modes cannot play such a role. Therefore,the method of capturing the out-of-step interface by seeking the lowest voltage point(the out-of-step center) can only group the generators with the main out-of-step modes,and may fail to combine the generators with the minor out-of-step modes into proper coherent generator groups. Thus,it is necessary in engineering applications to equip the generators that are likely to have the characteristics of the minor out-of-step modes with separation devices based on off-line simulation studies in order to reduce the risk of further accidents caused by these generators after system separation.

Methods for Increasing the Efficiency of Cleaning the Transfer Device

The article improves the quality of raw cotton by creating a new transfer device structure for the transportation of cotton in long-distance riots, located in the main building of the ginnery. Both foreign and domestic separator cleaners have been studied. Experiments were carried out on prototype transfer device and the results were obtained. The cleaning efficiency was determined by sampling the cotton entering the separator in the moving device and exiting after the inclined vibrating mesh surface installed after the separator.

Preload relaxation analysis and reliable life prediction of space connection and separation device based on accelerated degradation tests

The safety and reliability of space connection and separation device has become a key issue due to the increasing service span of deep space exploration mission.The long-term preload relaxation(a key failure mode)of connection and separation devices is focused in this paper.A series of tests have been designed and implemented to investigate the preload relaxation regulation and a comprehensive method has been constructed to analyze and predict the reliable lifetime of the device.The two-stage preload relaxation law of the device is found and reasonably considered.Due to the different relaxation mechanism,the first-stage preload relaxation is assessed based on the working-condition test results,and the second-stage preload relaxation is characterized by accelerated test results.Finally,the service reliability and reliable life are evaluated.The experiment and assessment results demonstrate the reasonability and effectiveness of the proposed method which can achieve long-service reliability analysis for space connection and separation device within limited time.

浅析管式分离机的制动装置

管式分离机多数机型需要停机后进行人工卸料,多数管式分离机制动是切断电源后再停车,存在停机时间较长的问题。为进一步提高管式分离机的分离效率,对管式分离机的制动装置进行探讨。阐述了离心机的机械制动、电磁制动、液压制动、液力制动和变频制动等方式,分析了各种制动装置在管式分离机上的应用可能性及其应用状况。为实现连续生产降低人工成本、避免对管式分离机机体的拆卸,可通过自动卸料装置的研制,来解决频繁停机后需人工卸料的问题。

花生复收机械分离清选装置设计与试验

针对花生在机械收获的过程中存在丢果率高、人工复收成本高等问题,且在复收时没有较好的分离清选装置,根据花生荚果的物理特性结合花生收获的农艺要求设计了一种用于复收的分离清选装置,并对其关键的部件进行了参数选择和机构设计。以前进速度、倾斜角度、滚筒转速为试验因素,以含土率、破损率、漏果率为试验指标对装置进行了三因素三水平二次正交旋转组合试验,分析其在作业状态下能达到最佳性能的工作参数,采用多目标优化方法,确定了前进速度、倾斜角度、滚筒转速与含土率、破损率及漏果率之间的相互关系。试验结果表明:在行进速度为1.48m/s、倾斜角度为20.32°、滚筒转速为275.82r/min时,装置的复收效果最好,此时的含土率为1.66%,破损率为1.30%,漏果率为2.32%。

马铃薯收获机扰动分离装置设计与试验

针对现有的小型马铃薯收获机筛面土块破碎效果不佳而影响分离效率和收获品质等问题,结合北方马铃薯主产区收获模式和常用杆条式分离装置,设计了一款马铃薯收获机扰动分离装置。在阐述总体结构及工作原理基础上,结合马铃薯的碰撞特性和土块的破碎过程分析,得到影响薯块损伤和土块破碎的主要因素为扰动深度、偏心轮转速和偏心距;通过EDEM-RecurDyn耦合构建仿真模型,单因素试验得到扰动杆数量最优为4,以扰动深度、偏心轮转速和偏心距为试验因素,以马铃薯碰撞力和土块破碎率为评价指标,运用Box-Behnken中心组合设计方法进行仿真试验,对试验结果进行方差分析,利用响应面分析了各交互因素对试验指标的影响规律,结合实际工况确定影响因素最佳取值。验证试验表明:当收获机分离筛运行速度为0.7 m/s、扰动深度为51.5 mm、偏心轮转速通过调速器设为2.3 r/s、偏心距为31 mm时,土块破碎率为60.7%,电子马铃薯采集的碰撞加速度峰值平均值为790.66 m/s~2,小于马铃薯临界损伤阈值。

进程可编辑的NCM前驱体洗分装置自动控制系统的设计与应用

NCM三元镍钴锰正极材料与钴酸锂正极材料相比,具有成本低、环保性好、容量高、循环性能好等优势,被称为是第三代锂离子电池正极材料。从三元湿料到干料过程中,主要包括过滤、陈化、洗涤、吹干、输送等工序。本文结合实际项目,介绍一种以板框压滤机为洗分工序的主体设备,配合阀站、仪表和控制系统,经由螺旋输送至干区直至包装,洗分工序涉及进浆、压榨、洗涤、吹干、输送等工序。该系统克服了传统洗分方式需要大量的现场人员干预,操作繁琐、指标不稳定的缺点,在实际应用中取得了良好的使用效果,实现了三元锂离子电池正极前驱体洗分系统的无人监管、自动控制,稳定了生产工艺流程,减少了现场人员工作量。

基于Fluent的ZJ17卷接机组一次风分机理

由于梗丝分离效果受工作区间风速的影响较大,开展对一次风分装置风分机理的研究对提升香烟的品质具有重要意义。文中运用SolidWorks软件对一次风分装置进行建模,基于Fluent软件获得一次风分装置的出风口风速,并进行试验验证;在此基础上,对一次风分装置腔体内的风场、出风口风速和出风口至工作区间的风速进行分析。研究结果表明:一次风分装置内部气流区域回流和部分紊流现象明显;出口气流流速试验得出分布区间为21.87~25.9 m/s,仿真得出分布区间为21.0966~25.924 m/s,仿真结果与试验结果基本一致;出风口到工作区间的流速逐渐降低,流速变化速率也逐渐减小。一次风分装置内部气流区域回流和部分紊流会导致出风口风速分布不均匀;在外部风场的作用下,工作区间的风速分布会产生二次变化。

筛分风选组合式油菜复清装置设计与试验

针对现有油菜联合收获后籽粒含杂率高及人工复清劳动强度大等实际生产问题,试制了一款适用于油菜联合收获脱出物复清装置。测定了晾晒后油菜联合收获后脱出物主要组份和各脱出物质量占比及脱出物主要物理特性,并利用脱出物主要物理特性差异,设计了筛分风选组合式油菜复清装置。为验证该装置的作业效果,选取对复清装置性能影响较大的电机转速、风机转速为试验因素,以清洁率和损失率为试验目标,开展单因素试验及双因素综合性能试验研究,当电机转速为1200r/min、风机转速为1350r/min复清作业效果较佳。试验结果表明:装置清洁率达98.4%以上,损失率为2.4%,作业噪音为71dB(A),清洁效率能够达到400kg/h以上,符合油菜复清作业要求。

轻型马铃薯收获机分离升运装置设计与试验

针对西南丘陵山区马铃薯收获机械短缺、分离升运效果差等问题,设计了一种适宜丘陵山区黏重土壤的链式分离升运装置.通过对分离升运装置薯土分离过程中的力学、运动学、碰撞过程进行理论分析,确定了关键部件结构和工作参数.以机具前进速度、一级分离升运装置线速度、振动机构频率为试验因子,以明薯率、伤薯率作为试验评判标准进行田间试验,建立各评判标准与因子的回归数学模型,分析试验因子对试验评判标准的影响并进行参数优化.结果表明:机具前进速度为0.78 m/s、一级分离升运装置线速度为1.10 m/s、振动机构频率为4.50 Hz时,该收获机明薯率为98.4%,伤薯率为0.7%,理论值与试验值接近,满足马铃薯收获作业要求,优于国家行业标准.

井下油水分离装置现状与展望

油田进入开发中后期,采出液含水率急剧上升,如何降低含水率并提高采收率是开发后期需要解决的首要问题。井下油水分离技术利用水力旋流技术、重力分离技术或其他油水分离工艺实现在井下对采出液进行预分离,从而采出较低含水率的油水混合液,此项技术对于高含水油田具有很大应用前景。通过对井下油水分离装置的研究现状进行简要分析与总结,并指出目前井下油水分离装置存在的问题与挑战,同时做出展望,为其发展提供一定的参考。

润滑油储罐油气分离技术与应用

苏里格天然气处理厂天然气压缩机废润滑油储罐呼吸阀挥发气携油问题严重,通过对携液问题的现场研究,提出了安装于呼吸阀前新型油气分离装置。通过现场试验表明:(1)通过加长直管段增大携液气流行程,达到降温、凝结的作用;(2)通过增加吸油滤芯和集油槽,达到过滤油滴、回收润滑油的作用;(3)杜绝了润滑油喷出现象。

可调式分土装置的设计及试验

针对垄作大葱收获分土阻力大问题,确定了可调式分土装置的结构,降低了分土作业时消耗的功率。装置由分土圆盘、支架、调节座等组成,可将葱垄两侧的土壤进行切割、抛送。借助Design-Expert8.0.6软件,以分土盘的距离、偏角、转速为试验因素,功率为指标设计正交旋转组合试验,确定距离、偏角、转速对分土盘功率的影响顺序为偏角>转速>距离。利用响应曲面对试验结果进行优化,得到分土盘低功耗的最佳参数组合,即距离为100mm、偏角为20°、转速为30r/min。通过田间试验验证了最佳参数组合分土盘的分土效果较好,分土功率均值为145.8W。