Computational modelling of water flow inside laboratory Knelson concentrator bowl

Enhanced gravity concentrators such as Knelson concentrator (KC) are extensively used in the mineral processing industry. The complexities of KC bowl geometry and variation of feed characteristics have forced process engineers to design empirically new units using laboratory and pilot-scale Knelson concentrators. However, numerical modelling methods such as computational fluid dynamics (CFD) and discrete element method (DEM) provide a better insight of flow behaviour of fluid and particulate solid phases inside these processing units. This article reports findings of CFD simulations for single-phase water flow inside the laboratory KC. An available standard 7.5-cm laboratory KC bowl was numerically simulated using realisable k-ε turbulence model to resolve the turbulence dispersion of existing transitional flow regime. The effects of relative centrifugal force (RCF) intensity and bed fluidisation water flow rate on the water velocity and pressure distributions were studied. Simulations confirmed the swirling flow pattern governing inside the bowl. The results revealed that the impact of RCF intensity on the water field values is greater than that of bed fluidisation water flow rate. Both velocity and pressure variations inside the bowl rings followed a linear trend.     

Characterisation of a 300× photovoltaic concentrator system with one-axis tracking

A solar concentrator with one-axis tracking is being developed at our institute. This concentrator system achieves a high geometrical concentration ratio of 300 using a parabolic trough mirror and a three-dimensional second stage consisting of compound parabolic concentrators. The design of the system as well as the characterisation of the second stage is described in this paper.     

水平浓缩燃烧器在65t/h煤粉炉上的应用

介绍65t/h煤粉炉的基本概况和存在的问题，详细阐述了采用水平浓缩煤粉燃烧技术对原燃烧器的改造过程，对改造前后运行参数及经济效益进行了对比。     

Magnetic Flux Controllers for Induction Heating Applications

Application of magnetic flux controllers/concentrators to induction heating coils can drastically improve the process efficiency and heat pattern control. Presentation includes: benefits provided by flux controllers, materials available for controllers, application techniques, computer assisted design of induction coils with concentrators, examples of applications. Depending on induction system design, magnetic flux controllers can concentrate heating in a specified area,change heat source distribution and shield a particular part zone or external area preventing unintended eddy current heating.Besides of the coil efficiency improvement and optimal power distribution, magnetic flux controllers reduce the coil current demand from a supplying circuitry thus strongly reducing losses in busswork, cables, transformers and inverter components.Improvement that can be achieved due to magnetic flux controllers is case dependable. 2D and 3D computer simulation allows the designer to predict accurately effect of controllers on the coil parameters and temperature distribution and optimize the whole electromagnetic system. Special attention in presentation is paid to new magnetodielectric materials optimized for induction heating conditions. These materials have high magnetic permeability and saturation flux density,excellent machinability, good chemical and temperature resistance. Concentrators from these materials can work in a wide range of frequencies and specific powers. Examples of magnetic flux controller application include surface hardening of shafts and gears, induction surface hardfacing and brazing.     

变压吸附制氧机吸附器结构研究进展

介绍了变压吸附制氧机中吸附器的内部结构、分流板、分子筛布局与装填方式、压料部件与装配等内容,对影响制氧机性能的因素进行了剖析和论述,探讨了变压吸附制氧机设计中关键影响因素和技巧。     

应用锥型聚光器的光导管系统采光性能的实验与分析

设计了一种带有锥型聚光器的光导管照明系统,并对其进行了采光性能实验,通过测量3种典型天气状况下3个系统的采光性能,得到光通量变化和照度分布的曲线,并同原光导管夏季的试验结果进行比较,得出了该系统的照明效果明显优于原系统的结论.     

导磁体在汽车零件感应加热中的应用技术

本文简单介绍了导磁体工作的基本原理，并给出在汽车零件大规模生产中所积累的导磁体应用的一些经验，以阐明如何更有效地使用导磁体。     

ARM处理器的远程抄表系统集中器设计

集中器是低压电力线载波集中抄表系统中的关键设备,能够通过下行信道自动抄收并存储各种具有载波通信功能的智能仪表、采集终端或采集模块以及各类载波通信终端的数据,同时能通过上行信道与主站进行数据交换。本文对集中器系统的总体结构进行研究,利用ARM芯片AT91SAM9260设计了电力远程抄表中的集中器。     

基于嵌入式Linux的远程抄表系统集中器的实现①

通过分析比较国内外各种现有远程抄表系统的优点和不足,结合当前计算机技术和通信技术的发展和作者的实践经验,实现一种基于S3C2440处理器和嵌入式Linux的设计方案;具体说明了该方案的系统架构,并详细介绍了集中器嵌入式软件实现的关键技术。     

基于嵌入式Linux的远程抄表系统集中器的实现①

通过分析比较国内外各种现有远程抄表系统的优点和不足,结合当前计算机技术和通信技术的发展和作者的实践经验,实现一种基于S3C2440处理器和嵌入式Linux的设计方案;具体说明了该方案的系统架构,并详细介绍了集中器嵌入式软件实现的关键技术。