700 MW 机组汽轮机阀门管理设计分析

汽轮机阀门管理是数字电液调节（DEH）系统的重要功能之一．可提高机组的经济性和稳定性。为此．叙述了阀门管理的基本功能．并针对珠海发电厂700MW汽轮机阀门管理程序的设计原理和运行情况进行了详细分析。     

损伤叶片动力参数变化规律的数值模拟与试验研究

风力发电机叶片的结构动力特性是叶片结构设计时考虑的重要方面,其动力特性对于整个风力机的安全运行具有重要意义.为了研究损伤引起的结构自振频率的变化规律,从有限元模拟以及试验两方面结合进行了研究.通过对比两种研究方法所得的固有频率值的变化规律,找出他们的共性,从而互相印证结果的正确性.结果表明,叶片的固有频率值受损伤位置、...     

间冷回热再热循环的最佳膨胀比分析

简单概述了燃气一蒸汽联合循环的发展前景,对间冷回热再热循环系统的膨胀比做出了进一步的分析,分析得出合理分配高低压气机的膨胀比能够有效提高燃气轮机的热效率。     

9F级燃机发电机出口处铁磁谐振分析

9F级天然气-蒸汽联合循环机组在国内才刚开始使用,其特性并不全为人们所熟知。一起发生在该类型机组发电机出口电磁式电压互感器的铁磁谐振事故有别于常规,本文结合该电厂的电气接线和启动特点对该事故进行分析,并提出作者的一些思考。     

12 MW抽汽式汽轮发电机组增容改造

介绍了鞍钢齐大山铁矿热电分厂2台C12-50/5型单抽冷凝式汽轮发电机组由12 MW增容到15 MW改造的实例。分析了改造过程中遇到的问题,及采取的解决方法。对改造前后运行参数及经济效益进行了比较。     

Research and development for shrouded wind turbines

In order to exploit wind power as economically as possible, it was suggested that the wind turbine should be enclosed inside a specially designed shroud. Various geometries are discussed; it is shown that with a fairly compact shroud a significant power augmentation can be achieved. For improving the shroud performance, the use of a ring-shaped flap or boundary layer control technique is introduced. It is shown that up to 80% improvement in the shroud power augmentation can be obtained by the use of an appropriate ring-shaped flap while proper bleeding of the shroud's external flow into its inner rear part will increase its power augmentation by about 25%. The present review also discussed the design and performance of an axial flow turbine which is the most suitable for the proposed shrouds. It is shown that such a turbine produces a fairly stable output for varying wind speeds while exhibiting a fairly high efficiency. Based on the reported research with shrouds, a pilot plant producing 1 hp at 5 m/s with a 3 m dia. turbine was built. Its design and preliminary field test results are also included in the review.     

双流道转轮水力透平机的全流道数值模拟

依据给定的参数,对水力透平机进行模型设计。采用FLUENT软件对所设计的水力透平机进行了全流道三维定常湍流数值模拟,计算以雷诺时均N-S方程为基础,基于贴体坐标和交错网格划分,对控制方程进行变换和离散。采用SIMPLEC算法实现速度、压力变量的分离求解。定常湍流计算采用了标准k-ε湍流模型。模拟计算获得了水力透平各过流部件内部的流动机理,该数值计算方法和结果对水力透平机的水力优化设计具有重要意义。     

发电机静态励磁系统产生的轴电压分析和防治

目前,国内、外大型汽轮机组基本上采用静态励磁系统作为发电机转子励磁电流的供电电源,静态励磁系统引起的轴电压对发电机组轴瓦电腐蚀的危害程度也比传统的励磁方式大得多。在重点分析了静态励磁系统的轴电压产生原因及传输机理之后,针对机组实际运行工况进行了相关试验测试,根据试验结果给出了相应的防范措施。目前,这些轴电压防治措施已经在国、内外大型机组上得到广泛应用。     

Exergoeconomic and exergoenvironmental evaluation of power plants including CO2 capture

CO₂ capture from power plants, combined with CO₂ storage, is a potential means for limiting the impact of fossil fuel use on the climate. In this paper, three oxy-fuel plants with incorporated CO₂ capture are evaluated from an economic and environmental perspective. The oxy-fuel plants, a plant with chemical looping combustion with near 100% CO₂ capture and two advanced zero emission plants with 100% and 85% CO₂ capture are evaluated and compared to a similarly structured reference plant without CO₂ capture. To complete the comparison, the reference plant is also considered with CO₂ capture incorporating chemical absorption with monoethanolamine. Two exergy-based methods, the exergoeconomic and the exergoenvironmental analyses, are used to determine the cost-related and the environmental impacts of the plants, respectively, and to reveal options for improving their overall effectiveness.For the considered oxy-fuel plants, the investment cost is estimated to be almost double that of the reference plant, mainly due to the equipment used for oxygen production and CO₂ compression. Furthermore, the exergoeconomic analysis reveals an increase in the cost of electricity with respect to the reference plant by more than 20%, with the advanced zero emission plant with 85% CO₂ capture being the most economical choice. On the other hand, a life cycle assessment reveals a decrease in the environmental impact of the plants with CO₂ capture, due to the CO₂ and NO_x emission control. This leads to a reduction in the overall environmental impact of the plants by more than 20% with respect to the reference plant. The most environmentally friendly concept is the plant with chemical looping combustion.     

风力叶片用HME玻璃纤维的研制

以E玻璃的SiO2-Al2O3-CaO三元体系中的低熔点配方为基础,加入MgO、TiO2、WO3、Li2O等网络改性剂,调整组成比例研制成功HME玻璃纤维。研究了体系中高模量的氧化物Li2O、WO3、CeO2以及Ti02的比例对玻璃纤维浸胶纱的拉伸强度和模量的影响。经过一系列优化设计制备的HME玻璃纤维浸胶纱的拉伸强度和拉伸弹性模量均高于E玻璃,达到并超过国外商用高模量无碱玻璃纤维的技术指标要求。