可控流皮带转运系统技术及在焦化行业的应用

目前,皮带转运溜槽系统在设计上一般只考虑物料的通过性问题,没有考虑到物料流动和空气流动的影响,使得大部分物料转运点普遍存在扬尘、磨损、撒料、堵料等问题,尤其是在焦化行业中,普通溜槽导致焦炭破碎率的问题得不到改善,一般是通过降低转运落差、设计料打料装置,但效果不明显、改造难度大。针对此问题,可控流皮带转运系统可以缓冲料流产生的冲击以控制焦炭流动速度并减少粉尘的产生,降低焦炭破碎率。针对各种不同环境,设计S型落料曲面,利用焦炭运输产生的惯性,使用曲面改变焦炭运行轨迹,将高空坠落改为有序滑落,从而有效降低焦炭的破碎率。     

换流变压器三相直流偏磁的计算研究

为研究相邻架设的交直流线路互感在换流变压器中产生的三相直流偏磁情况,在计算了单相变压器二次侧直流电流所产生的偏置磁通与励磁电流的基础上,对直流线路基波电流引起的换流变阀侧直流电流及其在换流变三相产生的直流偏磁进行了分析,讨论了△绕组的影响,并在Matlab中对换流变三相励磁电流做了仿真计算。其结果表明：交直流线路互感引起的换流变三相直流偏磁大小不等,且会因Y-△连接而发生变化,而由此产生的变压器接地中性点零序电流的直流分量为零。     

密闭输送管道的控制与调节——梭式非能动控制系统

介绍了密闭输送管道的梭式非能动控制调节系统。分析了该系统在管道破裂保护,管道排气补气,翻越点后液流保护,大落差管段液流保护和特殊环境状况保护等方面的特点,该系统利用流体自身的能量,自动控制和啊输送管道的流动状态,消除和降低因水击及其他原因引起的压力波动,使其达到新的平衡。     

超高压输电线路耐张四联串整体更换装置的研制及应用

随着电网技术的发展，大截面大容量导线在超高压线路上的应用日益普及，大截面导线的使用，孕育了耐张四联绝缘子串型产生。     

三相不平衡对剩余电流保护器误动的影响分析

剩余电流保护器是低压系统保障人身以及设备安全的重要设备，但是谐波、三相不平衡等因素会导致剩余电流保护器发生频繁误动，甚至使其无法投入使用。针对低压配电网三相不平衡系统，综合考虑三相线路阻抗、漏阻抗及负载的不平衡情况，建立了三相不平衡系统漏电流仿真模型，然后在多种不平衡程度及负荷水平下，对系统的漏电流进行了仿真分析。结果表明，在三相线路阻抗或漏阻抗不平衡下，系统的漏电流很小；在三相负荷不平衡的情况下，系统的漏电流较大，且负荷水平及负荷不平衡度越高，漏电流越大。因此，负荷水平及负荷不平衡度是剩余电流保护器频繁误动原因之一。     

一维流固耦合振动问题的解析解

有流体流动的管道的振动，是典型的一维流固耦合振动，由于解析求解一维流固耦合振动方程存在困难，这里对这一问题提出简化模型，即将有流体流动的管道简化为移动载荷作用下的简支梁，通过求解原方程的固有特性和简化模型的响应曲线，来分析原问题的振动特性。     

水平管内栓流空气输送的数值解析

在水平管内的高浓度粒子空气输送常采用波状栓流输送方式。本文对此输送过程进行数值计算理论的研究，以气体的连续方程和运动方程在高速电子计算机上，以特性曲线法求解双曲形联立一次偏微分方程组，通过对逐个栓流进行追踪，定性地了水平管内栓流输送的诸状态参数。     

露天大落差粉煤尘的防治

分析了露天大落差粉煤尘产生的原因 ,提出防治措施 ,经过比较 ,确定利用伸缩溜槽来控制粉煤尘的飞扬 ,达到防尘治尘的目的。实践证明切实可行。     

配电线路设备雷击定位技术的开发与应用

根据配网故障停电数据统计,雷击在故障原因中所占比例最大,目前只能依赖于人工线路查障,但人工线路查障范围广、难度大、时间长,线路故障隔离和恢复供电时间延长,无法达到故障线路快速复电的要求,难免导致客户对停电时间长感到不满,从而造成投诉变多,造成了故障线路复电工作被动、效率低下等不良后果。现基于雷电定位系统功能,定位、收集复杂的配电线路设备坐标数据,进行优化处理并固化到雷电定位系统,通过技术改进,实现配电线路设备雷击定位。该技术具备普遍适用性,有利于运维单位实现故障点的快速定位,缩小查障范围,减少客户停电时间,提高供电可靠性。     

预制型充油电缆塞止接头

充油电缆塞止接头是超高压充油电缆系统中的一个重要部件,在大长度高落差线路中普遍使用。上海电缆研究所已经开发生产了132kV和220kV两个品种。 该产品采用国际先进水平,结构合理,性能稳定。塞止接头的外腔绝缘全部由工厂预制,现场安装时间比传统结构缩短一半。在额定负荷下塞止接头中心导体温升比电缆导体温升低     

径向间隙及叶片型线对液环泵性能影响的分析

采用欧拉气液两相流动模型对液环真空泵内部三维非稳态气液两相流动进行数值模拟,通过数值模拟研究叶轮与壳体间的径向间隙及叶片型线对液环泵性能的影响,分析了液环泵内液相能量转换的规律,分析了前弯、后弯及直叶片不同叶片型线液环泵性能曲线,分析了叶轮径向间隙对液环泵性能的影响。数值模拟结果表明后弯叶片、径向直叶片和前弯叶片下液环泵的极限真空度和最大流量依次递增;随着叶轮径向间隙的减小,液环泵的极限真空度和最大流量逐渐增大。为液环泵的性能优化研究提供了理论依据。     

A New Synthetic Hydrocarbon Liquid Lubricant for Space Applications

Synthetic hydrocarbon liquid lubricants (based on polyalphaolefins) have been developed for use in space applications. These materials have been fully characterized and their physical properties reported which include: kinematic and absolute viscosity, viscosity index, vapor pressure, evaporation, specific gravity, pour point, coefficient of thermal expansion, refractive index, and flow activation energy. In addition, tribological properties under ultrahigh vacuum conditions have been determined. These include: lubricated lifetimes using a spiral orbit tribometer (SOT) and vacuum four-ball wear rates. These values are compared to existing state-of-the-art space lubricants.     

负压抽吸在煤化工液体泄漏物回收中的应用

为了解决少量煤化工液体泄露物在回收过程中的问题和不足,特别是对于少量液体泄漏物的回收,提出了一种负压抽吸的收集方法,介绍了射流器负压抽吸的原理和方法,并进行了试验研究,对得出曲线进行分析比较,结果表明:负压抽吸吸收液体泄漏物的效果十分明显.     

Sewerage force adjustment technology for energy conservation in vacuum sanitation systems

The vacuum sanitation is the safe and sound disposal approach of human excreta under the specific environments like flights, high speed trains and submarines. However, the propulsive force of current systems is not adjustable and the energy consumption does not adapt to the real time sewerage requirement. Therefore, it is important to study the sewerage force adjustment to improve the energy efficiency. This paper proposes an energy conservation design in vacuum sanitation systems with pneumatic ejector circuits. The sewerage force is controlled by changing the systematic vacuum degree according to the amount of the excreta. In particular, the amount of the excreta is tested by liquid level sensor and mass sensor. According to the amount of the excreta, the relationship between the excreta amount and the sewerage force is studied to provide proper propulsive force. In the other aspect, to provide variable vacuum degrees for different sanitation requirements, the suction and discharge system is designed with pneumatic vacuum ejector. On the basis of the static flow-rate characteristics and the vacuum generation model, the pressure response in the ejector circuit is studied by using the static flow rate characteristics of the ejector and air status equation. The relationship is obtained between supplied compressed air and systematic vacuum degree. When the compressed air is supplied to the ejector continuously, the systematic vacuum degree increases until the vacuum degree reaches the extreme value. Therefore, the variable systematic vacuum degree is obtained by controlling the compressed air supply of the ejector. To verify the effect of energy conservation, experiments are carried out in the artificial excreta collection, and the variable vacuum-degree design saves more than 30% of the energy supply. The energy conservation is realized effectively in the new vacuum sanitation systems with good application prospect. The proposed technology provides technological support for the energy conservation of vacuum sanitation systems.     

Development and performance of a magnetic ionic liquid for use in vacuum-compatible non-contact seals

For the electron-beam machining of optical media, a very low rotational speed is required to enable the precise fabrication of grooves of various depths and widths. In addition, a lubricant with a very low vapour pressure, such as an ionic liquid, and a vacuum chamber are needed to avoid contamination of workpieces. Accordingly, the development of a vacuum-compatible hydrostatic bearing using an ionic liquid is required to satisfy these rotational conditions and nanometre-order machining accuracy. To use a hydrostatic bearing in a vacuum environment, a non-contact vacuum seal is needed to avoid leakage of the ionic liquid used as the lubricant. Furthermore, making a non-contact seal using an ionic liquid requires the development of a new type of magnetic ionic liquid. Therefore, this paper describes the development of such a magnetic ionic liquid, which consists of magnetite (Fe₃O₄) particles, a newly synthesized dispersant, and a pyridinium-based ionic liquid. The outgassed products from this magnetic ionic liquid were measured when it was applied to a non-contact seal in a vacuum of about 10⁻⁶ Pa. In addition, its mechanical properties, such as viscosity and burst pressure as a non-contact seal, were measured. From these investigations, it was found that the developed magnetic ionic liquid would meet the requirements for non-contact seals to be used in vacuum-compatible hydrostatic bearings.     

基于网络分析的发电机无功优化研究

为解决发电机无功优化的问题,提出了一种具有概念清晰、计算便捷等特点的基于网络分析的发电机无功优化方法。该方法的实现过程包括,首先利用节点功率平衡的关系以及支路电压损耗的关系,得到了各节点电压以及支路无功潮流对除平衡节点以外的发电机节点无功出力以及平衡节点电压的近似灵敏度;其次,根据基于无功潮流追踪的网损分摊方法,将有功网损分摊到各发电机节点,且按照网损分摊的大小选取了发电机无功优化点;然后,通过各支路潮流以及节点电压,建立了近似的网损优化模型,且计算得到了发电机无功优化点的优化量;最后,用IEEE39节点系统验证了所提方法的有效性以及可行性。研究结果表明,所采取的措施能同时改善无功功率分布以及电压水平,具有一定的实用价值。     

更新常减压蒸馏装置减压塔设计及使用效果

在某厂常减压装置节能技术改造及减压塔更新设计中，运用“微湿式”减压蒸馏技术，减压塔采用了新型规整填料、槽盘式气液分布器、进料分布器等新技术，使装置操作平稳，处理量增大，减压塔拔出率提高了2．38％，效果显著。     

Tribological Performance of Room-Temperature Ionic Liquids as Lubricant

The tribological performance of room-temperature ionic liquid of alkylimidazolium tetrafluoroborate was evaluated using an Optimol SRV oscillating friction and wear tester in air and a CZM vacuum friction tester in vacuum (1×10^-3 Pa) using a steel/steel (SAE52100) contact. From the results, the ionic liquid exhibits excellent friction-reduction, antiwear proprieties, both in air and vacuum, which are superior to phosphazene (X-1P) and perfluoropolyether (PFPE). During friction, the ionic liquid forms a surface protective film mainly composed of FeF₂ and B₂O₃, which contributes to low friction and wear.     

真空压铸设备升级改造研究与实践

针对普通真空压铸设备生产过程中出现的产品问题,提出了升级改造压铸机的解决方法并进行实践,为压铸产品质量改善提供一种途径。通过设计并比较不同的方案,经过多次实践实验,确定了升级改造用真空箱结构,并对相应的模具结构设计提出了经济可行的方法,经过试模验证了模具设计的合理性,产品质量更好,实现了有效可靠的压铸机控制系统,为压铸行业设备升级改造提供经济性和可靠性均较高的解决方案。     

论工厂真空系统中冷却液的排放方式

对工厂的厂房真空使用及故障问题的事发点进行研究,并对现有真空系统中冷却液排放方式进行了分析,提出了相应的解决方案,有效保障数控设备使用真空的零件产品质量.对设备的寿命、能耗的节约以及维修成本的减少都具有重要的意义.