Temperature control of a solar furnace for material testing

A solar furnace is a thermodynamic device that concentrates sun radiation in order to achieve high-temperatures at a focus, where a sample of the material to be tested is located. This article address the problem of designing a control architecture for solar furnaces. It is motivated by the use of a solar furnace as an instrument in material science research to perform two types of experimental tests. In the first type, samples are tested in high-temperature stress cycles. In these experiments it is important to control the temperature profile. The second test type is characterised by imposing a solar radiation flux profile. On both experiment types there are strong nonlinear effects, a significant degree of parametric uncertainty and disturbances, such as solar radiation fluctuation due to clouds and to sun's apparent movement. Although the actuator (shutter) is much faster than the thermic system, it may destabilise the overall controlled system. The contribution of this article consists in the design of a control architecture for solar furnaces and the application of singular perturbation methods in order to derive conditions in the form of bounds for the speed of actuator dynamics so that the closed-loop system is stable.     

动态矩阵控制在MSP430温控系统中的实现

把近年来工业中广泛应用的动态矩阵控制方法应用于电加热炉为对象的单片机温度控制系统中,该温度控制系统采用MSP430作为CPU,使用DMC作为控制策略完成温度控制,其控制效果与常规的数字PID算法进行比较。结果表明：使用DMC算法的系统响应速度和动态性能明显优于常规数字PID。其控温精度高,鲁棒性强,因此进一步推广该算法...     

焦炉新型煤气掺混器的开发与应用

针对以往煤气混合器的优缺点，设计开发了新型煤气混合器。新型煤气混合器具有掺混均匀、不易堵塞、操作方便安全等优点，对降低能源消耗和生产成本有积极的作用。该掺混装置应用于多个焦炉项目中，运行状态良好。     

浅谈我国石墨化工艺及设备的改造和发展

着重介绍我国石墨电极生产中爱奇逊石墨化工艺设备的情况及其供电设备由交流向大直流的改造，大直流石墨化工艺上的研究、技术改进和发展情况；同时介绍内热式串接石墨化新工艺，并通过对内热式串接石墨化和大直流石墨化工艺的比较，国外内热式串接石墨化工艺的应用情况和我国对内热式串接石墨化工艺试验，指出内热式串接石墨化是石墨化发展的趋势     

Unicase炉有效加热区的测定

本文介绍了Unicase炉有效加热区的测定方法，阐述了空炉测温的必要性，并对测量结果不理想时提出了改进措施。     

包钢BG-Ⅱ型无料钟炉顶布料器的现状与展望

简要介绍了包钢BG-Ⅱ型无料钟炉顶布料器原理、特点及现在使用状况,并提出了对该布料器作进一步改进的设想。     

天然沸石和乙烯炉渣双掺制备复合水泥的试验研究

针对茂名市乙烯生产基地大量排放沸腾炉渣却得不到妥善处理，同时结合当地沸石资源丰富，进行了沸石和沸腾炉渣制备复合水泥的实验。实验主要对沸石和炉渣的化学成分进行了分析，用激光粒度仪表征了原料粉体的粒度分布，通过单掺和双掺的方式研究了沸石和炉渣对水泥强度、需水量、凝结时间和安定性的影响，并对作用机理进行了讨论。研究表明，沸石和炉渣单掺或双掺掺量达到40％时都能配制合格的P·C32．5级水泥。由于两种混合材粒度不同而存在交互作用，双掺效果比单掺更好。     

3号高炉扩容改造及生产实践

长钢炼铁厂3号高炉在扩客改造中采用多项新技术，如：无料钟炉顶、皮带上料、顶燃式热风炉、脉冲式布袋尘器、自焙炭块炉底和炉缸等．3号高炉于2000年8月1日投产，仅两个月达到设计指标，目前利用系数达到2．6t／(m^3．d)以上。     

RH真空处理设备循环流量的研究

在传输现象和能量守恒的基础之上 ,推导出了循环流量和RH操作因素的关系式 在与宝钢的现场值对比之后 ,建立了一个考虑到RH炉龄变化因素的循环流量计算公式 ,并为RH真空处理的工艺实践提供了理论依据     

Microstructure comparison of ZK60 alloy under casting, twin roll casting and hot compression

The microstructures of ZK60 alloy under conventional direct as-casting (DC),twin roll casting (TRC) and twin roll casting followed by hot compression (TRC-HC) were analyzed by optical morphology (OM),electron backscatter diffraction (EBSD) and X-ray diffraction (XRD).The deformation condition of hot compression is 350 ℃,0.1 s?1.The microstructural evolution under TRC-HC deformation followed by annealing at different temperatures and time was discussed.The results show that TRC provides more modified microstructure compared with DC.Twins are found in TRC processing;dynamic recrystallization (DRX),shear bands and twins are found in TRC-HC.A short annealing time has little effect on hardness,while during a long time annealing,it is found that low annealing temperatures increase the micro-hardness and high temperature decreases it.