大型风力发电机变桨控制系统设计

变桨距风力发电机已成为风力发电机组的主要研究和发展方向,文章以大型风力发电机组的变桨距系统为研究对象,通过对硬件系统的功能描述,设计了变桨系统的总硬件电路和伺服电路。在此基础上,为实现硬件电路的良好调节作用,对风机启动后变桨程序和调功程序的软件流程图作了详细设计。经过以上的软硬件设计,满足了大型风力发电机组变桨的控制要求。在实际应用中,获得了良好控制效果。     

滑销系统对循环气汽轮机振动的影响及对策

汽轮机组是化工装置的核心设备,振动也是其主要故障,分析了因滑销系统产生振动的原因,采取了处理措施。     

基于MATLAB的汽轮机调节级变工况特性快速计算

汽轮机调节级的变工况计算是汽轮机热力核算中的常见问题之一.在对调节级特性数据计算的基础上,应用MATLAB软件绘制调节级的通用特性曲线,并拟合特性曲线方程,为汽轮机机组变工况提供一种计算方法.     

汽轮机不开缸除钠盐的试验与应用

介绍了一种简单实用的汽轮机不开缸除钠盐方法——灌水泡洗法，该方法在平顶山天源盐化有限责任公司1^#、2^#汽轮机应用获得了成功，并取得良好的效果。     

混流式水轮机叶片强度计算及其应力特性改善

近年来，国内外一系列大型混流式水轮发电机组频繁发生转轮叶片的疲劳裂纹问题，对电站机组的安全稳定运行构成了严重威胁。本文以一混流式水轮机为研究对象，通过混流式水轮机全流道CFD计算及基于顺序流固耦合的转轮结构应力场计算，分析该转轮产生疲劳裂纹的原因；其次通过在叶片出水边和上冠连接处加应力释放三角块来降低叶片最大有效应力值和改善叶片应力分布。结果表明应力释放三角块可以明显降低叶片最大有效应力和改善叶片应力分布。本文计算结果可为其它水轮机转轮的转轮疲劳裂纹分析及应力特性改善提供参考。     

徐州电厂7汽轮机节能增容改造

应用先进技术对７汽轮机通流部分进行了改造，使该老机组的效率及容量得到了提高。成果表明，对某些老机组通流部分进行优化改造，对机组增容、效率提高及减小对环境污染来说是有效的途径之一。     

The research and development of new type of ferro-base heat-resistant alloy

Nickel-base superalloys are high performance materials subject to severe operating conditions in the high temperature turbine section of gas turbine engines.Turbine blades in modern engines are fabricated from Ni-base alloy single crystals which are strengthened by ordered g’ precipitates.Turbine disks are made from polycrystal line Ni-base alloys because these components have higher strength requirements(due to higher stresses).By increasing the upper temperature limit for the next generation of disk materials,the aviation industry will see significant environmental as well as cost benefits. Researchers in the High Temperature Materials Center of the National Institute of Materials Science of Japan have recently completed their work on a new kind of disk alloys.The new disk alloys,a kind of nickel-coble-base superalloys processed by a normal cast and wrought(C & W) route,can withstand temperatures in excess of 725 degree centigrade,a 50-degree increase over C&W disks currently in operation. In this presentation,the author shows the design idea,workability and properties of these Ni-Co-base superalloys. Furthermore,the evaluation of the processing and microstructure on a full-scale processing of Ni-Co-base superalloy turbine disk are described,which demonstrated the advantages and possibility of the Ni-Co-base disc alloys at the component level.     

Validation of the CATHARE2 code against experimental data from Brayton-cycle plants

In recent years the Commissariat à l’Energie Atomique (CEA) has commissioned a wide range of feasibility studies of future-advanced nuclear reactors, in particular gas-cooled reactors (GCR). The thermohydraulic behaviour of these systems is a key issue for, among other things, the design of the core, the assessment of thermal stresses, and the design of decay heat removal systems. These studies therefore require efficient and reliable simulation tools capable of modelling the whole reactor, including the core, the core vessel, piping, heat exchangers and turbo-machinery. CATHARE2 is a thermal-hydraulic 1D reference safety code developed and extensively validated for the French pressurized water reactors. It has been recently adapted to deal also with gas-cooled reactor applications. In order to validate CATHARE2 for these new applications, CEA has initiated an ambitious long-term experimental program. The foreseen experimental facilities range from small-scale loops for physical correlations, to component technology and system demonstration loops.In the short-term perspective, CATHARE2 is being validated against existing experimental data. And in particular from the German power plants Oberhausen I and II. These facilities have both been operated by the German utility Energie Versorgung Oberhausen (E.V.O.) and their power conversion systems resemble to the high-temperature reactor concepts: Oberhausen I is a 13.75-MWe Brayton-cycle air turbine plant, and Oberhausen II is a 50-MWe Brayton-cycle helium turbine plant. The paper presents these two plants, the adopted CATHARE2 modelling and a comparison between experimental data and code results for both steady state and transient cases.     

汽机第六段抽汽温度高的原因分析及处理

重点分析广州发电厂4台汽轮机第六段抽汽温度高的原因，并有针对性地进行系统改造，使机组运行的安全性、经济性得到提高。     

新型水轮机的研究与开发

低水头竖井贯流式水轮机具有结构简单,安装、维护方便,水性能优良,造价便宜的优点,但由于对机组的流道设计、机组总体的结构形式、采用增速器的连接方式等关键技术缺少深入的研究、设计,致使低水头竖井贯流式水能机组在我国未能得到有效开发、推广使用。本文基于拟建电站所在地水文条件,借鉴灯泡贯流式水轮机设计原理,采用数值模拟和模型试验相结合的方法进行开发,设计满足电站运行条件的超低水头竖井水轮机组。本设计为其他超低水头水轮机的开发利用提供了依据。