广西柳电公司200MW机组热控系统的改造

介绍了柳电公司 2 0 0 MW机组热控设备采用 DCS进行改造的必要性、改造方案、系统的功能实现 ,改造后 ,机组自动投入率、机组主保护投入率达 10 0 %     

广西柳电公司200MW机组热控系统的改造

介绍了柳电公司200MW机组热控设备采用DCS进行改造的必要性,改造方案,系统的功能实现,改造后,机组自动投入率,机组主保护投入率达100％。     

2×167MW抽汽供热机组DCS改造

9、i0号机组热控系统自动投入率很低。投产以来，虽经多次努力，投入率始终难以提高。本文描述了改造前存在的问题、控制系统的设计方案、改造前后效果对比及不足。     

提高高加投入率和给水温度的几点措施

给水温度是200MW机组经济运行的重要指标之一,高加投入率是保证给水温度的重要条件。我厂200MW机组自投产以来,对高加的汽水系统、疏水系统等进行了革新改造,使高加投入率、给水温度都达到了同类型机组较好水平。1990年两台机组高加投入率分别达到98.22％和86.5％,给水温度达到240℃以上。我们主要做了下面几点改进。     

某热电厂200MW汽轮机组高压加热器故障分析及对策

通过分析某热电厂2台200MW汽轮机组近年来高压加热器的运行状况及其发生故障的原因，提出相应的技术改造措施，以提高高压加热器投入率，从而提高整个机组的经济性。改造后，高压加热器投入率达99％以上，经济效益显著。     

华电内蒙古能源土默特一期2台660兆瓦空冷机组工程全面竣工投产

正华电内蒙古能源有限公司土默特发电分公司#2机组顺利通过168小时试运行,正式移交生产,标志着该公司一期2×660兆瓦空冷发电机组工程全面竣工投产。本刊讯6月30日,华电内蒙古能源有限公司土默特发电分公司#2机组顺利通过168小时试运行,正式移交生产,标志着该公司一期2×660兆瓦空冷发电机组工程全面竣工投产。期间,机组工况稳定,机组负荷满足电网调度要求,电气保护投入率、热控保护投入率、自动化投入率、仪表投入率、脱硫、脱硝及除尘装置的投入率     

PLC在锅炉烟气温度检测系统中的应用

针对300MW机组锅炉烟气温度检测系统存在的问题，采用Pico一体化PLC对其进行了技术改造，提高了系统的可靠性和投入率，改造后新系统功能简洁实用，线路清晰明朗，维护工作量大大减少，系统投入率可达100％。     

125MW机组高加投入率分析

１２５ＭＷ机组高加投入率分析台州发电厂谢森波高压加热器是否安全运行，对机组稳发、满发、经济运行有重要的作用。为此，笔者根据本厂１２５ＭＷ机组特点，对影响高加投入率诸因素作一分析，并提出对策，提高了高加投入率。１．影响高加投入率的原因分析ａ．蒸汽对本体...     

我国单机容量最大的超超临界燃煤机组投入运营

华能海门电厂1号1.036 G W机组已顺利完成168 h试运行,正式投入商业运行。这是华能玉环电厂成功建设国内首座GW级超超临界燃煤机组电厂后国内投产的单机容量最大的机组。该机组取得了一次并网成功、一次带满负荷成功、一次通过168 h试运行的好成绩,并实现脱硫试运同步完成。保护投入率、仪表投入率、自动投入率均达100%,圆满实现了上半年投产的目标。该机组的顺利投产迈出了海门“电煤路港运”一体化能源基地建设的坚实步伐。     

200MW机组分散控制系统改造

结合通辽发电厂１号机组分散控制系统的改造,介绍了ＨＩＡＣＳ－３０００分散控制系统的配置,整个分散控制系统具有协调控制、数字电液控制和数据采集三大功能。介绍了协调控制系统的组成,对数字电液控制系统的配置和特点进行了分析,并介绍了数据采集系统的画面及打印功能。经过调试自动投入率达到１００％,为以后同类型机组的改造提供了经验。     

Users' Needs Lighting, Start-Up Power, Transportation, Mechanical Utilities, Heating, Refrigeration, and Production

The needs for emergency and standby power to enhance industrial and commercial power systems are frequently left wanting due to ignorance of the needs or of the systems available to satisfy the needs. This paper discusses various situations which require or desire emergency or standby power and mentions suitable systems for each application. The areas discussed include lighting, start-up power, transportation, mechanical utilities, heating, refrigeration, and production.     

光、城市、生活、未来……——世博轴及地下综合体工程艺术灯光景观

工程介绍 世博轴及地下综合体工程（简称世博轴）位于浦东世博园核心区。南起耀华路,跨雪野路、南环路、北环路、及浦明路,到滨江世博公园。     

Grades, Quizzes, Motivation, and Computers

The following paper describes the use of a simple FORTRAN computer program that may be used to determine course grades. The program is based on processing a set of IBM punched data cards. Each card contains the name of a student and all of his grades, including the final examination grade. The program may also be used to predict the final examination grade, based on previous quiz grades, and then, in turn, to predict the final course grade. It is thus possible to use this program periodically throughout the entire semester in order to provide the student, as well as the instructor, with a measure of his progress.     

Dual-rotor, radial-flux, toroidally wound, permanent-magnet machines

A novel machine family-dual-rotor, radial-flux, toroidally wound, permanent-magnet (RFTPM) machines-is proposed in order to substantially improve machine torque density and efficiency. After the principles of operation, configurations, and features are discussed, the machine design and optimization guidelines are given. A prototype has been designed, built, and tested. The measured torque density of the prototype, which well matches the design value, is almost three times of that of the induction machine with the same power of 3 hp and speed. Meanwhile the efficiency is still kept high and the material cost is kept low by using ferrite magnets. Three novel approaches are proposed to reduce the cogging torque in the RFTPM machines, whose validity is verified by finite-element analysis results and experimental measurements.     

A new soft-switched, thyristor-based, regenerative, quasi-resonant,current regulated inverter

A variety of soft-switching techniques have been proposed to reduce the switching losses and EMI problems that occur with higher switching frequencies in hard-switched converters. In this paper, a new, quasi-resonant, soft-switched, three-phase inverter is presented which uses 12 thyristors as the power electronic switches, and hence has potential for use in high-power applications. The converter is fully current-regulated, suitable for high-performance motor drive applications, and is capable of 4-quadrant operation to allow regeneration back into the DC supply. The operation and the control of the inverter are described in detail and simulation and experimental results are presented     

Industrial system grounding for power, static, lightning, andinstrumentation, practical applications

Practically every structural steel building erected for industrial use incorporates reinforcing steel bars installed in the concrete footings. This, without any additional effort, constitutes a grounding electrode. The quantity of electrodes is directly related to the building area. When the structural steel framework is erected and interconnected, these electrodes are also interconnected in a parallel arrangement. Similarly, high-voltage metal transmission towers are installed using a metal footing base embedded in a concrete filled hole. The four tower legs are effectively in parallel and offer an adequate low ground resistance such that additional electrodes are generally not required. This brings us to the main point: the reinforced concrete footings, reinforced concrete grade beams, and other reinforced concrete structures provide, with a little work, an effective, reliable, and cost attractive system grounding vehicle