用VC++成组传送的DDE在沥青拌合楼控制中的应用

传统的DDE在批量数据变量交换方面存在着一些缺陷,本文提出采用成组传送DDE的方式交换数据变量,利用成组传送DDE提供的动态链接库接口开发应用程序,极大的节省了系统资源,加速了变量交换。这种方法在沥青拌合楼控制系统的开发中得到了很好的应用。     

200MW乏气送粉机组主蒸汽温度控制优化方案

本文在常规火电厂主蒸汽温度自动控制方案的基础上,对200MW乏气送粉机组的特性进行了分析,结合锅炉主要参数与主蒸汽温度自动控制的相互关系,以及相关的工艺要求,提出了一种新的优化方案。     

成都金堂电厂水集中控制系统

成都金堂电厂一期2×600MW燃煤机组新建工程水集中控制系统包括锅炉补给水、循环水、综合水泵房及净化站、凝结水精处理、工业废水、制氢站、化学加药等子系统。该控制系统共配置了7套罗克韦尔AB的ControlLogix系列冗余处理器及其I/O模件、9台操作员站、5个电源柜及23个远程I/O机柜,远程机架与控制器通过ControlNet相连。系统的控制编程软件采用LOGIX5000,操作员站监控组态软件采用RSVIEW32。该系统应用较为成功,其系统构成和策略值得借鉴。     

MODICON Quantum PLC在电厂输煤系统中的应用

在电厂输煤系统中,输送线路一般较长,设备分布比较分散,电厂在满足工艺要求的前提下,需尽量减少劳动定员和降低劳动强度。本文通过介绍MODICON Quantum PLC的特点,并将其与华蓥山发电有限公司电厂输煤系统的工艺要求相结合,分析了如何运用PLC来实现对电厂输煤系统的控制。本应用案例具有一定的参考价值。     

基于 PSTA2003状态监测系统的水布垭电厂机组运行状况分析

基于PSTA2003状态监测及趋势分析系统和水布垭电厂机组运行积累的数据,通过对比、平滑拟合和作各种曲线图形等分析方法,分析不同机组在各种条件下运行工况的表现,并重点对不同水头下机组的运行状况进行了分析,有利于指导电厂的机组运行、维护检修和保障机组的安全经济运行。     

采油厂采油生产物联网管理平台探讨

本文主要探讨了某采油厂采油生产物联网管理平台的实现。介绍了该平台的构架以及平台所达到的使用效果及实现的特色功能。整套平台实现了对采油厂生产全过程的生产数据采集、生产过程可视化管理、生产环境监测、单井自动化诊断、设备管理等主要功能。达到了高效管理,节能增产的目的。     

恰希玛核电站二期工程核岛基坑降水与回灌技术

恰希玛核电站二期工程核岛基坑降水与回灌，没有可供参考的先例。本文阐述了降水与回灌所经历的过程、改进措施以及最后取得的成果，总结了与回灌技术相关的经验教训，为类似的大型工程提供借鉴。     

舰船动力装置模拟器改进设计

受当时仿真技术条件的限制,一代舰船动力装置模拟器硬件运行可靠性差,故障率越来越高;模拟对象软件非标准化、非模块化,在线修改不便;可视化软件实时性不强;教练员控制台运行功能弱,目前已不能适应当前新的使命任务要求,影响到模拟器的正常使用.结合现代仿真技术,该文对模拟器的软、硬件系统提出了可行的改进方法,给出了改进后的舰船动力装置模拟训练系统,使模拟器整体性能有了显著提高,满足了当前使用需求.     

Can phytoplankton community structure be inferred from satellite-derived sea surface temperature anomalies calculated relative to nitrate depletion temperatures?

Hydrographic data collected in the upper 50 m off La Jolla, CA, USA (31°N, 117°W) between 1970 and 1972 were reanalyzed to examine temporal variability in the local temperature-nitrate relationship and to document how chlorophyll a concentration and phytoplankton community structure covary with the temperature-nitrate relationship. Based on the linear expression y=mx+b, the y-intercepts (b), slopes (m), and x-intercepts (−b/m or nitrate depletion temperature, NDT) of four seasonal (January-March, April-June, July-September, and October-December) temperature-nitrate relationships, obtained from the combined multiyear data set, were statistically different from each other and varied around overall multiyear values of b=72.73 μM, m=−5.33 μM °C⁻¹, and NDT=13.65 °C. Three interannual temperature-nitrate relationships from February to April 1970, 1971, and 1972 also had y-intercepts, slopes, and x-intercepts that were statistically different from each other. Nevertheless, limited variability in direct comparisons among seasonal or interannual regression lines and a 1 °C La Jolla NDT range compared to a 25 °C global NDT range supported the general utility of NDT-based comparisons. A nitrate-normalized temperature axis (T−NDT) was created for the La Jolla data set by subtracting NDT from the recorded water column temperatures (T). Chlorophyll a reached a maximum between 0 and 2 °C on this T-NDT axis that ranged from −4 to 10 °C. Microscope-based determinations of La Jolla centric diatom, pennate diatom and dinoflagellate abundances, and La Jolla chlorophyll a, partitioned in proportion to the numerical abundance of the three groups, both peaked in logical progression along the T-NDT axis. In a separate analysis of high-performance liquid chromatography (HPLC) data from three Atlantic Meridional Transect (AMT) cruises (50°N to 52°S), chlorophyll a peaked below 0 °C and three different phytoplankton classes, nanoflagellates, large eukaryotes and prokaryotes, distributed in logical progression along a sea surface temperature (SST) minus NDT axis. To further generalize these results, a previously reported 1° latitude×1° longitude grid of NDTs for the world ocean was applied to satellite-derived grids of SST for March 1999 through June 2000. The SST−NDT calculation provided a standard nitrate-normalized axis simultaneously applicable to all locations in the world ocean. Sixteen plots of satellite-derived chlorophyll a versus SST−NDT for March 1999 through June 2000 demonstrated the opposing seasonal movements of northern and southern hemisphere chlorophyll a along the SST-NDT axis. Based on the phytoplankton community patterns along the temperature minus NDT in the La Jolla and AMT data sets, this chlorophyll a movement along the SST-NDT axis can be associated with phytoplankton community changes related to location around SST−NDT=0 °C. The SST−NDT index appears to provide a useful tool for interpreting the character of the phytoplankton community structure contributing to satellite-derived chlorophyll a in the world ocean.     

黄台电厂7号炉投产后首次化学清洗技术分析

黄台电厂7号炉在第三次大修中进行了投产后的首次化学清洗,清洗方法采用了盐酸加硫脲一步除铜清洗,复合磷酸盐淋洗、钝化的工艺。清洗结果是成功的,为今后机组的安全经济运行奠定了基础;同时我们也总结了经验,吸取了教训。本文着重对这次酸洗中存在的问题做了简要的分析,提出了几点建议。