某铅锌厂生产执行系统的实施方案

本文通过详细介绍生产执行系统(MES系统),针对企业过程控制(PCS系统)层与上层管理系统(EPR系统)之间的脱节、信息阻断等情况,设计提出MES系统实施方案。     

基于软件构件技术的冶金工业过程控制系统

在冶金行业过程控制系统(PCS)的L2计算机过程控制应用系统的设计和开发中,考虑了软件复用的构件技术,以构造新的软件应用系统.通过对宝钢分公司炼钢区域(转炉、精炼和连铸等工序)L2计算机应用系统的功能需求分析和领域分析,归纳共通的功能需求特点,建立了炼钢领域数据模型和炼钢领域子系统模型,创建构件.构件的设计过程中考虑固定体部分,即满足炼钢领域中各工序需求具有公共性的设计.通过领域分析和领域模型的建立,考虑某构件与其他构件的关系及构件内部的实现.对于变化体的设计采用"配置"的方法.     

基于主元空间数据重构的传感器故障识别及应用

针对基于主元分析的过程性能监控方法没有充分利用主元模型信息,以及基于 SPE 的信息重构故障诊断方法只利用了残差空间信息的局限性,通过定义故障子空间,对基于T2统计量的主元空间故障数据重构技术进行分析,得到故障可完全重构的条件及指标,从而计算出故障识别指标.将其应用于发酵过程的传感器故障识别,结果表明,该算法能够有效地...     

基于PCS7的加热炉综合控制方案设计与实施

针对工业生产中常见的加热炉装置,设计了基础过程控制系统以及安全相关系统。选用西门子DCSPCS7进行基础过程控制系统实施,选用西门子PLC S7-400FH进行安全仪表系统实施,完成了系统配置。同时,进行了仪表供电系统设计。综合控制方案实施的结果表明,本方案能够合理可行地完成加热炉综合控制任务。     

PCS7在聚丙烯挤压造粒机控制系统中的应用

在介绍上海石化聚丙烯挤压机工艺特点和原控制方案的基础上,详细介绍了将控制系统升级到PCS7的实施方案,并通过两个关键回路的组态和分析,总结了在PCS7软件组态方面的经验和特点。     

Particle shape modification and related property improvements

The increasing sophistication of powder metallurgy processing, together with the greater demands on final product quality have led to an increased demand for metal powders of high quality. In this paper we report the successful preparation of two spheroidized metal powders, —electrolytic copper powder mixed with Al₂O₃ particles and hydrogenation-dehydrogenation (HDH) titanium powder — produced by high speed impact using a particle composite system (PCS). Experimental results show that irregularly shaped metal particles can be processed into spherical particles by use of this process. The spheroidizing process increases bulk density of Ti powder from 1.15 g/cm³ to 1.73 g/cm³ and its fluidity index from 46 to 71, improves surface morphology of either single Ti particles or composite Al₂O₃/Cu particles and molding properties of bulk powders. The characteristics of sintered parts made from spheroidized powders are superior to those of products made from the untreated irregular powders.     

先驱体转化法制备Diamond/SiC复合材料

以聚碳硅烷(PCS)为先驱体,采用先驱体浸渍裂解工艺(PIP)制备出Diamond/SiC复合材料,重点研究制备工艺参数对复合材料致密度等性能的影响规律。结果表明:PCS裂解产生的β-SiC与基体中α-SiC和Diamond的界面相容性良好,有利于Diamond/SiC的致密化;模压压力、浸渍液浓度以及预氧化处理等制备工艺参数是影响Diamond/SiC复合材料致密度的主要原因;Diamond/SiC多孔坯经7个周期的PIP处理后可成为致密度较高的Diamond/SiC复合材料。     

西门子PCS 7在牡丹江石油化工厂—自动控制中的应用

黑龙江省牡丹江市石油化工厂仪表自动控制改造,在2007年检修期间,更新换代原有的设备,使用比较先进的西门子公司的PCS7操作软件来控制催化裂化装置,PCS7它具有先进性,可靠性,使整个生产完全实现了计算机控制。     

Evaluation of paraffin/water emulsion as a phase change slurry for cooling applications

A Phase Change Slurry (PCS) is a latent heat storage and transfer medium consisting of a Phase Change Material (PCM) as a dispersed phase and a carrier fluid as a continuous phase. PCSs have a high energy density because they use not only the sensible heat capacity of the carrier fluid, but also the latent heat capacity of the PCM during the phase transition. In this paper, a paraffin/water emulsion has been studied as a PCS for comfort cooling applications in a temperature range of 0–20 °C. A paraffin blend having a melting temperature range of 2–12 °C was used for preparing the emulsion. The properties of the emulsion were studied in view of the application requirements on PCSs. The dependence between the paraffin fraction and emulsion properties was investigated. The stability of the emulsion was examined both during the storage period and under mechanical–thermal loads in a test rig by determining the change in the properties. The results indicate that the paraffin/water emulsion containing a paraffin weight fraction of 30–50 wt.% is an attractive candidate for cold storage and distribution applications.     

ERP/MES/PCS集成系统在浮法玻璃行业中的应用改进研究

浮法玻璃企业作为我国重要的流程型生产工业,近年来发展迅速,但是要想在竞争激烈的国际市场中立足,就必须建立健全ERP/MES/PCS集成系统。通过对浮法玻璃企业中ERP/MES/PCS集成系统的应用现状的研究,提出了适合浮法玻璃企业发展的一系列改进措施,在实现两化融合的基础上,进一步提高企业的综合管理水平和市场竞争力。