ZLSG-400GD全自动排污滤水器在三峡地下电站中的应用

本文主要介绍了ZLSG-400GD全自动排污滤水器工作原理及其技术特点,以及滤水器在三峡电厂地下电站中的应用,并与三峡左岸、右岸ZLSG-400G型滤水器进行了对比分析。     

旗岭泵站技术供水系统滤水器技术改造探析

在分析ZLSG-300型滤水器结构和功能特征、存在问题及成因的基础上,通过技术改造,并搭配使用RF3-32S-B2-NME1-N5-1-I-3/SKS1000-525611型滤水器,在满足技术供水系统对水质、水量、水压的要求下,能有效解决滤水器检修维护难度大的问题,从而保障技术供水系统的稳定.同时也证明滤水器在开式技术...     

三峡调速系统集油箱油冷却器渗漏改造处理

介绍了三峡右岸电站调速系统集油箱管式油冷却器的工作原理和结构,针对运行中出现的渗漏现象进行了原因分析,提出在冷却水前加装滤水器等解决方法,有效地解决了换热器的渗漏问题,为调速系统的安全运行提供了保障.     

大型水轮发电机组电气制动技术在三峡水电站的应用

分别介绍了电气制动技术在三峡左岸电站、右岸电站以及右岸地下电站的应用情况,阐述了各种电气制动技术的原理以及在三峡水电站的实际应用效果,并重点分析了三峡右岸电站柔性电气制动技术存在的问题和技术改进情况。     

三峡右岸电站技术供水系统调试

三峡右岸电站技术供水系统具有管道直径大、供水流量大、设备先进及供水质量要求高、末端用户多等特点。三峡右岸首台发电机组(22号机组)蜗壳充水前,采用临时供水方式进行技术供水系统的有水调试,确保了右岸电站首台机组的提前发电。文章根据三峡右岸电站22号机组技术供水系统调试,介绍了该电站技术供水系统的组成、特点和调试工艺。     

三峡电站建设与中国水电站计算机监控技术进步

介绍了三峡左、右岸电站计算机监控系统的方案和实施经过,分析比较了左岸电站引进的监控系统与右岸电站自主研发的监控系统的运行情况,总结了计算机监控系统在三峡左、右岸电站的技术进步与提高,介绍了三峡特大型电站监控系统采取技术引进、消化吸收及自主研发所取得的成绩和经验,并对存在的问题和原因进行了分析。     

三峡电站建设与中国水电站计算机监控技术进步

介绍了三峡左、右岸电站计算机监控系统的方案和实施经过,分析比较了左岸电站引进的监控系统与右岸电站自主研发的监控系统的运行情况,总结了计算机监控系统在三峡左、右岸电站的技术进步与提高,介绍了三峡特大型电站监控系统采取技术引进、消化吸收及自主研发所取得的成绩和经验,并对存在的问题和原因进行了分析.     

三峡电站建设与我国水电站计算机监控技术进步

介绍了我国三峡左、右岸电站计算机监控系统的方案和实施经过,分析比较了左岸电站引进的与右岸电站自主研发的监控系统的运行情况,总结了计算机监控系统在三峡左、右岸电站的技术进步与提高,总结了三峡特大型电站监控系统采取技术引进消化吸收及自主研发所取得的成绩和经验,并对存在的问题和原因进行了分析。     

三峡右岸电站监控系统的功能设计与开发

三峡右岸电站监控系统以国产计算机监控系统为基础,通过借鉴三峡左岸电站的监控系统的成功投运经验,并充分考虑用户需求,历时2年设计、研发、调试、投运,现已在三峡右岸电站全面投产。分析了三峡右岸电站监控系统的系统结构、数据采集、网络安全、管理支撑等功能的设计过程,介绍了监控系统的当前投运状况,并讨论了三峡右岸电站在水电站监控...     

东方电机公司承制三峡右岸4台700MW水轮发电机组

20 0 4年3月2 7日,东方电机股份有限公司与中国长江三峡工程开发总公司正式签订了三峡右岸机组的制造合同,在12台三峡右岸机组中,东方电机公司将自主承担4台70 0MW水轮发电机组研制任务.水轮机转轮是水轮发电机组的心脏,东方电机公司在三峡右岸机组研制中将采用自行研发的达到世界先进水平的新型转轮,并对三峡右岸机组从转轮的水力稳定性、空化性能以及机组的运行可靠性等方面进行研究开发,用自主研制的高水平的国产化装备装备中国的三峡电站.三峡右岸机组的自主研制将带动我国大型水电机组的研究、设计、制造水平攀登世界高峰,促进我国民…     

地下厂房施工过程的三维非线性数值模拟分析

根据冗各电站地下厂房开挖支护的施工顺序,以隐式杆单元模拟锚杆,以壳单元模拟混凝土喷层,采用三维非线性有限元技术,对洞室群的开挖支护动态过程进行了模拟计算。通过三维非线性有限元计算分析得到:洞室群动态开挖过程中围岩应力变形的分布规律,围岩塑性区的发展规律,锚杆受力变化情况。计算结果表明:整个开挖过程中,洞周围岩位移变化规律正常,量值较小,塑性区主要分布在洞室周边,围岩稳定性较好;但在洞室交叉口处围岩的变形较大,出现较大范围的塑性区,在此基础上提出了支护措施优化方案,并对优化方案的效果进行了评价。     

Evaluation of freshwater mussel relocation as a conservation and management strategy

The relocation of unionacean mussels is commonly used as a conservation and management tool in large rivers and streams. Relocation has been used to recolonize areas where mussel populations have been eliminated by prior pollution events, to remove mussels from construction zones and to re-establish populations of endangered species. More recently, relocation has been used to protect native freshwater mussels from colonization by the exotic zebra mussel Dreissena polymorpha. We conducted a literature review of mussel relocations and evaluated their relative success as a conservation and management strategy. We found that 43% of all relocations were conducted because of construction projects that were forced to comply with the Endangered Species Act 1973 and that only 16% were monitored for five or more consecutive years. Most (43%) relocation projects were conducted from July to September, presumably a period when reproductive stress is relatively low for most species and the metabolic rate is sufficient for reburrowing in the substrate. The mortality of relocated mussels was unreported in 27% of projects; reported mortality varied widely among projects and species and was difficult to assess. The mean mortality of relocated mussels was 49% based on an average recovery rate of 43%. There is little guidance on the methods for relocation or for monitoring the subsequent long-term status of relocated mussels. Based on this evaluation, research is needed to develop criteria for selecting a suitable relocation site and to establish appropriate methods and guidelines for conducting relocation projects.     

基于模型试验的河床砂砾石层基本特性研究

为了经济可靠地确定深厚覆盖层的基本特性参数,以大渡河双江口水电站坝基河床砂砾石层基本特性研究为工程背景,进行大尺寸模型试验,研究河床砂砾石层的旁压模量和动探击数随密度、级配以及上覆压力的变化规律。根据室内模型试验结果,结合现场旁压试验及钻孔试验成果,推断出坝址区河床砂砾石相关层位的密度,并依此进行砂砾石室内力学试验,获得设计所需力学参数。研究成果可为深厚覆盖层基本特性测试提供新的方法。     

基于BP神经网络-马尔科夫链模型的隧道围岩位移预测

在隧道工程施工中,围岩位移预测起着很重要的作用。将BP神经网络-马尔科夫链模型引入到隧道围岩位移预测中来,通过对训练样本的学习,利用BP神经网络实现了对位移时间序列的滚动预测,同时得到了实测值与预测值的相对误差;在此基础上利用马尔科夫链对相对误差进行修正,有效地提高了预测结果的精度。并将该模型应用于某公路隧道拱顶下沉位移时序预测中,结果表明该模型具有精度高、科学可靠的特点,为隧道围岩变形的预测提供了新的途径。     

Short communication. Pipelines as a refuge for freshwater snails

In the lower River Murray, Australia, populations of gastropods have declined markedly over the past 40 years. Of the native fauna of about 18 species, only the ancylid Ferrissia petterdi remains common (but in patches), and another five species feature in sporadic local resurgences. Until recently the viviparid Notopala was thought to be extinct. The introduced physid Physa acuta is widespread, but in low numbers. The decline probably is associated with flow regulation, high turbidity and the introduction of common carp. Snail populations have persisted, however, in irrigation pipelines fed from the river, where they periodically cause blockages. This paper reports the discovery of the only known populaion of Notopala hanleyi in a pipeline where the inner wall accumulates microbial and other organic matter, providing high quality food for snails. In the Murray before regulation most of the periphytic biomass was probably microbial, as fluctuating water levels would have maintained littoral communities in a highly productive, early state of succession his postulated that, by stabilizing seasonal water levels, regulation has promoted the production of filamentous green algae, an inferior food source, and so displaced snail populations from the open aquatic environment.     

浙江省水域调查录入系统的设计和应用

浙江省水域调查录入系统将调查数据与电子地图相整合,对分类水域数据进行统计计算,并对输入数据进行合理性和完整性检查,得到调查范围内现有水域的详细数据,实现了水域调查数据输入、计算、统计和查询的数字化管理,提高了工作效率和工作质量,为各地下阶段水域保护规划编制和水域管理工作提供了数据支持。对该系统的设计原则、功能和技术设计等作了介绍。     

基于CT-连续加荷水泥乳化沥青混凝土细观损伤规律研究

利用CT技术对水泥乳化沥青混凝土的细观损伤过程进行实时扫描观测,获得了混凝土试件在连续加荷下的CT图像。通过采用直观分析法、CT数分析法、CT数与损伤变量关系3种方法分析表明,水泥乳化沥青混凝土的破坏过程可分为压密、扩容、裂纹扩展、破坏4个阶段,同时混凝土在受压过程中具有韧性,在极限荷载之前各断面处于压密和微扩容的强化阶段,极限荷载之后混凝土从损伤到破坏发展比较平稳。     

Automated system for removal and pneumatic transport of fly ash from electric precipitator hoppers

A system for removal and pneumatic transport of fly ash is examined, in which air pulses act on batches (pistons) of ash formed in a duct. Studies are made of the effect of several physical parameters on the force required to displace a piston of ash and these serve as a basis for choosing a system for removal and pneumatic transport of ash simultaneously from several hoppers of an electric precipitator. This makes it possible to separate the ash particles according to size without introducing additional components. Formulas are given for calculating the structural and dynamic parameters of this system and measurements of indirect dynamic parameters are used to calculate the input-output characteristics of the system. In order to optimize the system, configurations for summing several ducts into a single transport duct for pneumatic ash transport are proposed. Some variants of dry ash utilization and the advantages of producing of size-separated particles are considered. __________ Translated from élektricheskie Stantsii, No. 2, pp. 26–30 (2008).     

The flood pulse advantage and the restoration of river-floodplain systems

The ‘flood pulse advantage’ is the amount by which fish yield per unit mean water area is increased by a natural, predictable flood pulse. Evidence for this increase is presented from tropical and temperate fisheries. It is argued that increasing multispecies fish yield by restoring the natural hydrological regime is consistent with increasing production of other trophic levels and with restoration from ecological and aesthetic viewpoints. When applied to a river-floodplain system, this restoration would provide a large, self-sustaining potential for recreation, commercial exploitation, and flood control. An interim ‘natural flood pulse’ restoration approach is proposed for systems modified for navigation. This approach approximates the natural hydrological regime in a river reach and is intended as a first step in the long process of restoring the watershed.     

浅谈天湖水电站水轮机运行故障及处理措施

简述天湖水电站投运以来各种故障的表现形式，分析其原因，提出了相应的处理方法及措施，并对合理利用国内外设备提出建议。