现场总线控制系统在核燃料后处理萃取装置中的应用

基于Delta V、基金会现场总线(FF)和Profibus DP总线设计核燃料后处理萃取装置的FCS系统,并集成设备管理系统。给出了系统的控制网络、FF总线、Profibus DP总线、萃取装置脉冲系统、流体输送系统和界面控制系统方案。     

我国核燃料后处理仪表发展技术研究

回顾了早期生产堆后处理厂中接触式测量仪表的选用、安装和维护方式;论述了动力堆后处理中试厂使用的非接触式和间接式测量仪表的原理和优势;在分析智能仪表优势的基础上,给出了Profibus PA和FF总线仪表在后处理工程的应用;最后,得出非接触式和间接式的测量方案与智能仪表的组合是未来后处理厂最佳选择的结论。     

现场总线控制系统在空分装置中的应用

某厂在空分装置改造时,对原仪表控制系统的改造采用了北京冶金自动化院Smar技术服务中心的EIC2000-FF-H1现场总线系统。该系统是按FF标准开发的,集成了基金会的现场总线、OPC技术、SQL、ODBC、IEC1131-3标准图形编程语言、TCP/IP、Windows NT4·0操作系统和通用的人机接口软件AIMAX等先进技术,使现场总线控制系统(FCS)具有开放性和易扩展等特点。系统中的操作站和现场智能仪表为网络上接点,控制回路部分仪表采用Smar公司的FF现场总线设备,具有“即插即用”的优点,用户可以自由地选用不同厂商提供的性能价格比最合适的设备…     

FF现场总线控制系统的质量要求及其实现技术

通过对临界实时安全系统质量要求的分析，提出了FF现场总线控制系统的质量要求，并结合FF的特点给出了满足质量要求的实现技术。利用FF的冗余技术实现了FF现场总线控制系统的系统级、回路级和仪表级的容错。利用FF的失效安全机制，使FF在出现不可避免的错误时仍然能够提供最低限度功能，从而实现了更深层次的容错。     

FF与Profibus-DP总线在电厂辅网系统的应用

结合莱芜电厂2×1050MW机组辅网系统,总结了FF和Profibus-DP总线的设计要点。以Ovation为平台,对Profibus-DP和FF总线进行了合理配置,实现对辅网系统的有效控制。针对Profibus-DP和FF总线技术组态调试过程中易出现的问题,给出了注意事项和解决方案。     

防蛀剂Eulan WA和Mitin FF在羊毛或羊毛混纺织物上的测定方法

在J.Soc.Dyers and Col.1985年第九期中,刊登了一篇测定羊毛或羊毛混纺织物上防蛀剂Eulan WA和Mitin FF用紫外光谱仪的测量方法。防蛀剂Eulan WA(新)或Eulan U33以及Mitin FF(高浓)是毛织物常用的防蛀剂。文章介绍的鉴别和测定这些防蛀剂的方法是:首先用氢氧化钠溶液将织物上的防蛀剂萃取下来,然后用紫外光     

丙烯酸装置中界面测量系统分析——浮力式测量的温度修正方法

本文对丙烯酸装置中萃取塔界面测量系统进行了全面分析，对用浮力式液面计测量界面的原理、系统的误差、温度补偿公式和原理进行了研究探讨。对其温度补偿公式中的系数计算方法进行了推算、反证。为界面测量系统在智能仪表与集散控制系统中应用温度补偿技术提供了计算方法。     

基于RS485通讯的微机监测系统

介绍了一种应用带通讯口的智能仪表和工控机,组成的基于RS485通讯的微机监测系统。该系统简单实用且性价比高。     

智能仪表管理系统的设计与应用解析

文章在阐述智能仪表内涵和管理现状的基础上,分析智能仪表系统设计的重要意义,并就智能仪表管理系统的设计与应用问题展开探究。     

基于Modbus总线协议的工业锅炉监控系统设计

针对目前锅炉控制系统多由PLC和DCS构成的特点,设计了一种基于Modbus通信协议的监控系统,该系统主要由多种智能仪表模块、三维力控forcecontrol5.0组态软件及工控机等组成。     

Determination of Cd,Cu, and Pb after Cloud Point Extraction using Multielemental Sequential Determination by Thermospray Flame Furnace Atomic Absorption Spectrometry (TS‐FF‐AAS)

Abstract

In the present paper a procedure for simultaneous preconcentration of Cd, Cu, and Pb using cloud point extraction (CPE) and multielemental sequential determination by thermospray flame furnace atomic absorption spectrometry (TS‐FF‐AAS) is proposed. This preconcentration procedure is based on the metals extraction into micellar media of octylphenoxypolythoxyethanol (Triton X‐114) after their reaction with 1‐(2‐pyridylazo)‐2‐naphtol (PAN). A Box‐Behnken design was used to optimize the variables (pH, buffer concentration and volume of NaCl) involved in the extraction procedure. Enrichment factors were calculated as the ratio between the slopes of calibration equations with and without the preconcentration procedure in the TS‐FF‐AAS, with values of 59, 25, and 21 respectively for Cd, Cu, and Pb. Limits of detection (LOD) (3s_b, n=10) were also calculated as 0.025, 0.38, and 0.43 µg L^?1 to Cd, Cu, and Pb, respectively. The precision (repeatability) expressed as relative standard deviation (RSD, n=10) for reference standards of 10.0 and 20.0 µg L^?1 were 6.1 and 4.5% for Cd, 7.2 and 3.4% for Cu and 5.2 and 8.7% for Pb. The accuracy was confirmed through the analysis of certified reference material (NIST 1643d, Trace elements in water). The developed procedure was also applied to Cd, Cu, and Pb determinations in mineral water samples.     

Controlled output variance based diagnosis tree for feedforward/cascade control systems

This paper aims at providing a framework for detection and diagnosis of the performance of a combinational feedforward (FF) and cascade (CC) control system. It is the extension of our previous work [1,2]. The main idea is to extract the only CC effect and the combination of FF with CC effects, respectively. In the only CC effect, the output variances of the primary and the secondary loops can be turned into the cascade-invariant and cascade-dependent terms, respectively. The combination of FF with CC effect can also be decomposed into the cascade/feedforward invariant term, the cascade-invariant/feedforward-dependent term and the cascade/feedforward dependent term. The diagnosis tree based on these decomposition terms is proposed to assess the performance of the FF/CC control system. The sequence of the statistical inference system is developed to diagnose fault causes. The capability of the proposed method is demonstrated via a cascade control system with the feedforward loops and multiple faults.     

用盐析与疏水层析相偶合快速分离提纯猪胰激肽释放酶

将疏水层析技术用于从猪胰脏中分离纯化激肽释放酶,建立了一种简便、快速的分离提纯方法：将粗品溶解后经过硫酸铵沉淀处理,然后经过Butyl Sepharose FF疏水层析后得到目标蛋白,分析其纯度大于500U／mg,盐析和疏水两步纯化的收率大于85．0％,同时比较了Phenyl Sepharose FF,Octyl Sepharose FF和Butyl Sepharose FF三种疏水介质分离纯化胰K的效果,本实验工艺与传统工艺相比,具有操作简单、快速、回收率和纯化倍数高等优点,有望成为一种从动物组织中快速分离纯化药用蛋白质的有效技术平台。     

Abatement of mercury emissions in the coal combustion process equipped with a Fabric Filter Baghouse

The purpose of this study was to investigate the dependence of mercury emissions on coal ranks and electric utility boilers equipped with Fabric Filter Baghouses (FF). A comparison of mercury emission rates and fly ash properties was made between a circulating Fluidized Bed Combustor (CFBC) with FF and a Pulverized Coal (PC) combustor with FF during the burning of all three ranks of American coals. The data were collected from the Environmental Protection Agency Information Collection Request (EPA ICR) and WKU ICSET’s mercury testing program. A statistical stepwise regression procedure was used to determine significant factors such as coal rank and types of boilers equipped with FF on mercury emissions during coal combustion. The higher mercury emission rates were generally found in both CFB and PC units when lignite was burned. The lower mercury emission rates were generally found in both CFB equipped with FF and PC units equipped with FF when bituminous coal was burned. There was a statistically significant lower mercury emission in the CFBC equipped with FF than that in the PC units when sub-bituminous coal was burned. Lower mercury emission rates in electric utility boilers equipped with FF are due to the active fly ash generated with a larger specific surface area and pore volume. Higher mercury emission rates observed during lignite-fired boilers may be due to their lower specific area of fly ash, which results from lower LOI, as well as the pore blockage by selenium (Se) for Texas lignite; and sodium (Na) and potassium (K) for North Dakota lignite. There is no significant mutual benefit for the mercury captured by the addition of Spray Dry Absorber (SDA) or selective non-catalytic reduction (SNCR) in the CFBC system.     

浅谈质量管理体系中文件控制程序的建立

质量管理体系文件是质量管理体系构成的基础要素,而如何对质量管理体系文件进行编写、评审、审批、发放、修订、回收和作废等过程进行控制需要有一个基本的流程和规范来进行,而文件控制程序正是起到了这样的作用.本文结合了本公司在质量管理体系建立过程中文件控制程序建立的方法,探讨了文件控制程序建立的基本流程,基本内容和要点.     

Optimizing the extraction of cobalt ions under response surface methodology and without organic solutions

In this study, response surface methodology was used to evaluate the extraction of cobalt ions using an aqueous two-phase system (ATPS). This method is environmentally benign and low-risk because water has replaced the poisonous and dangerous organic solvents in this extraction procedure. For the first time, a central composite design was employed to examine the effect of various factors on the extraction of cobalt ions. The findings of the experimental design revealed that the concentration and volume of cobalt ions had a considerable impact on the extraction percentage in the ATPS system. In contrast, the concentration of ammonium sulphate and pH had only a minor effect. The value of the correlation coefficient (R² = 0.9565) clearly shows the agreement between the mathematical model and the experimental results. The maximum extraction percentage was attained in optimum conditions (50% polyethylene glycol concentration, 3.75 M salt concentration, 0.5 ml cobalt volume, and pH 4).     

萃取塔界面控制系统的改进

利用DCS控制系统及智能变送器，取代了原来的就地气动控制系统，解决了原系统存在的问题，提高了生产的稳定性，减少了维护人员的工作量，大大提高了工作效率，保证了醋酸异丙脂的萃取。     

重组人血清白蛋白-干扰素β融合蛋白的分离纯化及质控方法的建立

目的建立中试制备重组人血清白蛋白-干扰素β(Recombinant human serum albumin-interferonβ,rHSA-IFNβ)融合蛋白的纯化工艺及质控方法。方法采用50 L发酵罐诱导表达rHSA-IFNβ融合蛋白,发酵液经超滤浓缩及脱盐后,再经BlueSepharose FF亲和层析、G25凝胶过滤层析和SP Sepharose FF阳离子交换层析纯化。SDS-PAGE(银染法)和HPLC测定融合蛋白纯度,Western blot分析反应原性,质谱法测定相对分子质量,Edman降解法测定N-末端氨基酸序列,等电聚焦电泳法测定等电点,细胞病变抑制法测定rHSA-IFNβ融合蛋白的生物学活性,其余检测项目均按《中国药典》三部(2010版)要求进行。结果纯化的3批融合蛋白纯度可达96%以上,具有人血清白蛋白和人干扰素β的双重反应原性,相对分子质量分别为89 070、89 035和88 669,N-末端氨基酸序列为:NH2-D-A-H-K-S,等电点为6.34,比活性分别为1.9×106、1.5×106和1.1×106IU/mg,其余各项指标均符合要求。结论已成功建立了中试制备rHSA-IFNβ融合蛋白的纯化工艺及质控方法。     

卫福拌种防治玉米丝黑穗病

比较了卫福和粉锈宁拌种防治玉米丝黑穗病的效果。用40％卫福悬浮剂5ml/kg种子拌种防效达88.47％,明显好于用15％粉锈宁可湿性粉剂5g/kg种子的防效。卫福拌种后使玉米出苗快而整齐,贮存半年之后对种子发芽率几乎无不良影响。