负载均衡技术的综述

随着网络技术的飞速发展,网络数据流量的增加,服务器的负载能力已不能满足实际的需求,负载均衡技术的提出解决了这一问题。文章分析了负载均衡要解决的主要问题及衡量指标,总结了几种负载均衡调度算法,为提高服务器的数据处理能力及网络的灵活性和可用性,提供了一种行之有效的方法。     

大客户负荷管理系统的运用

通过介绍大客户负荷管理系统结构、功能、作用及工作过程,分析江西新会供电局在大客户负荷管理系统建设存在的实际问题,并提出见解和对策。     

电力负荷控制技术在需求侧管理中的应用

对电力负荷控制系统在需求侧管理中的应用进行论述。     

Flow field design and optimization of high power density vanadium flow batteries: A novel trapezoid flow battery

Vanadium flow battery (VFB) is one of the preferred techniques for efficient large‐scale energy storage applications. The key issue for its commercialization is cost reduction, which can be achieved by developing high power density VFB stacks. One of the effective strategies for developing high power density stacks is to enhance the mass transport by performing flow field design. Based on the maldistribution characteristics of concentration polarization inside a conventional rectangular flow battery (RFB), a novel trapezoid flow battery (TFB) was first proposed. Furthermore, a practical and general strategy, consisting of a stepping optimization method and an arithmetic progression model, has been developed for the TFB's structure optimization. By combining numerical simulation with charge‐discharge test of the magnified stacks, it was verified that mass transport enhancement and performance improvement of the optimized TFB, with significant increments in voltage efficiency and electrolyte utilization, allowed it to possess great superiority over the RFB. © 2017 American Institute of Chemical Engineers AIChE J, 64: 782–795, 2018     

基于IOCP机制的负控管理系统研究

针对电力负控管理系统的客户端连接数量多、数据接收和发送频繁的现状,提出一种基于I/O完成端口（IOCP：I/O completion port）机制的大规模负控管理系统体系结构。研究了引入IOCP机制的通信模块的基本原理、实现方案和关键问题解决方法。进一步提出了负控管理系统上层软件的架构。最后通过模拟测试和实际项目证明：基于IOCP机制的负控管理系统开销性低、准确性高。     

加强生产调度管理 提高经济运行水平

介绍了应对制约因素下的不同产品负荷的调整措施以及氯碱企业生产调度的管理要点。     

Fines removal in a continuous plug flow crystallizer by optimal spatial temperature profiles with controlled dissolution

This work presents a systematic study for obtaining the optimal temperature profile in a continuous plug flow crystallizer (PFC). The proposed PFC consists of multiple segments where the temperature of each segment can be controlled individually. An optimization problem is formulated for a target crystal size distribution (without fines) with the temperature of the segments as decision variables. The results indicate that for the crystallization kinetics considered, dissolution steps are necessary for the reduction of fines due to nucleation. A systematic study on the form of growth and dissolution kinetics suggested that the key factor that determines whether the dissolution steps will be successful in reducing fines, without compromising the final size of the crystals from seed, is the size dependence of the growth and dissolution kinetics. Best fines removal is achieved when the larger crystals grow faster than the smaller ones and the smaller crystals dissolve faster than the larger ones. © 2013 American Institute of Chemical Engineers AIChE J, 59: 4582–4594, 2013     

基于EMD-BP神经网络的短期电力负荷预测

针对电力负荷具有的非平稳、随机性、不确定性的特点,提出用EMD-BP神经网络方法对电力负荷进行预测,通过EMD方法将非平稳、随机的电力负荷数据转换成平稳、确定性数据,之后利用BP神经网络进行电力负荷预测。通过仿真试验可以看出,相比于直接使用BP神经网络进行预测,EMD-BP神经网络的预测精度更高、相对误差较小。     

大惯量负载永磁同步电机优化控制

针对采用传统PI电流反馈解耦的大惯量负载永磁同步电机电流跟踪误差大、转速控制系统动态响应慢的问题,提出基于电压前馈解耦的电流矢量控制策略,并将实时观测的负载转矩补偿于电流控制环,既消除耦合项的影响减小电流跟踪误差,又加快了转速控制响应速度,提高了大惯量负载永磁同步电机转速控制系统的动、静态性能。因转动惯量随工况不同而变化,设计了转动惯量在线辨识和负载转矩实时观测器,进一步提高了转速控制精度。对控制策略与传统PI电流反馈解耦非转矩补偿控制进行对比仿真,并对转动惯量在线辨识和负载转矩实时观测进行了仿真验证,证明了其有效性。     

Distributional uncertainty analysis and robust optimization in spatially heterogeneous multiscale process systems

Multiscale models have been developed to simulate the behavior of spatially‐heterogeneous porous catalytic flow reactors, i.e., multiscale reactors whose concentrations are spatially‐dependent. While such a model provides an adequate representation of the catalytic reactor, model‐plant mismatch can significantly affect the reactor's performance in control and optimization applications. In this work, power series expansion (PSE) is applied to efficiently propagate parametric uncertainty throughout the spatial domain of a heterogeneous multiscale catalytic reactor model. The PSE‐based uncertainty analysis is used to evaluate and compare the effects of uncertainty in kinetic parameters on the chemical species concentrations throughout the length of the reactor. These analyses reveal that uncertainty in the kinetic parameters and in the catalyst pore radius have a substantial effect on the reactor performance. The application of the uncertainty quantification methodology is illustrated through a robust optimization formulation that aims to maximize productivity in the presence of uncertainty in the parameters. © 2016 American Institute of Chemical Engineers AIChE J, 62: 2374–2390, 2016     

可视化应急指挥系统在石化企业的应用

基于某石化企业的安全应急管理需求,开展构建应急程序化、图形应急指挥及应急预案等关键技术的研究,建立石化企业安全应急系统,并进行示范应用。     

Influence of the Fracture Criterion on the Failure Prediction of Ceramics Loaded in Biaxial Flexure

The failure probability of ceramic components in multiaxial stress states can be predicted from the results of uniaxial tests, if a suitable fracture criterion for multiaxial loading is known. In the paper it is investigated how the selected failure criterion influences the predicted distribution of the fracture stress of a component. Several acceptable failure criteria are found by comparing the results of four-point-bend tests performed with aluminum nitride with the results of concentric ring-on-ring tests.     

基于框架设计的液流电池流场优化模拟研究

液流电池通常采用对角平推流流场,会形成电解液滞留区,造成电池局部浓差极化大,影响综合性能。鉴于此,提出了一种基于框架设计的流场优化方法,通过设计电极框架,可以得到“蛇形流道”和“平行流道”两类流场。以全钒液流电池为例,通过数学建模,研究了不同流场结构和参数对于多孔电极内电解液流动特性、电化学反应和温度变化特性的影响规律。计算结果与实验结果一致性良好,结果表明：电解液在“平行流场”内的流动均匀性比在“蛇形流场”内好,且不存在滞留区,同时在“平行流场”内浓差极化也较“蛇形流场”低;此外,对于同样的电极面积,在电极内部的“平行流道”越多,电解液的流速分布越均匀,反应特性越好。     

CHARACTERISTICS OF PULSING FLOW IN TRICKLE BEDS. IMPROVEMENTS OF A MACROSCOPIC MODEL

A rather simple macroscopic model, originally proposed by Dimenstein and Ng (1986), is examined by comparison with results of experimental work carried out in this laboratory recently. Several improvements are proposed relying either on new correlations or in better physical understanding obtained from the recent experiments. The model, despite its simplicity, is considered quite comprehensive and reliable (for the range of physical properties examined) providing good estimates of essentially all the significant time averaged characteristics of pulsing flow.     

径向移动床反应器流场特性及其数学模拟

本文票据主流道变质量流及颗粒床层气固体力学理论,建立了完整的径向移动床反应器流体力学数学模型,开发了模拟计算床层气相二维流场的一种新的数学方法及相应的计算程序。黛此可以模拟计算床层气相压力和轴径向速度的二维分布、内外主流道压力和流速分布以及布气孔道的过孔气速和压降。根据模拟计算结果,提出首先优化设计两主流道截面积分配,然后采用变开孔率设计消除开孔区端效应的两步设计方法。借此实现径向移动床反应器的优     

Liquid‐liquid flow patterns in reduced dimension based on energy minimization approach

Study of liquid‐liquid flow patterns in reduced dimensions is relevant under the current trends to miniaturize process equipment. The phase distribution results from interplay of surface (dominant in microchannels) and gravity forces (dominant in larger dimensions). The proposed analysis, based on minimization of total system energy comprising of kinetic, surface, and potential energy, unravels the influence of wetting properties and predicts the range of existence of annular and plug flow as well as the onset of stratification with increasing conduit dimension. Unlike existing models marking abrupt transitions, the proposed methodology can predict zones of transition where interfacial distributions gradually evolve with change of operating conditions—the predictions agreeing closely to experimental and literature data. The analysis illustrates the coupled effect of diameter, contact angle, and inlet composition on flow distribution and defines the transition from macrodomain to microdomain (millichannels) in terms of Bond number as 0.1 < Bo < 10. © 2015 American Institute of Chemical Engineers AIChE J, 62: 287–294, 2016     

浅谈平板玻璃工厂供电的重要性和基本要求

介绍了玻璃企业(浮法、压延法等)工厂供电的重要性及基本要求。