大力发展清洁高效的超临界超超临界发电技术

阐述了超临界超超临界火力发电机组的技术特点和发展概况,以及我国超临界超超临界机组的国产化进程。     

超临界、超超临界机组锅炉给水泵的结构分析

采用超临界和超超临界机组是提高火电机组热效率，实现节能降耗、环保的有效途径；而超临界机组的锅炉给水泵是超临界火电机组的关键设备之一。通过对超临界机组锅炉给水泵结构的详尽分析，并将其内泵与传统的径向节段式多级泵进行分析比较，总结归纳出超临界锅炉给水泵结构的设计特点，从而揭示了为什么这种结构会具有性能稳定、高效节能、运行可靠等诸多优点。实践证明这种结构设计的思路和特点将是锅炉给水泵发展的趋势和主导方向。     

1000MW超超临界汽轮机控制系统研究

开发了具有自主知识产权的超超临界1000MW汽轮机组DEH系统,将其应用于汽轮发电机组中,解决了超超临界1000MW汽轮机的DEH控制系统国产化问题.     

超超临界燃煤发电技术的发展

超超临界燃煤发电技术能够大幅度提高发电机组的发电效率,进而提高能源的利用率,实现节能和减少温室气体的排放,对于人类社会的可持续发展具有十分重要的现实意义。本文对超超临界燃煤发电关键技术进行了比较全面的论述,在此基础上,详细介绍了国内外的超超临界燃煤发电技术的发展,对于从事相关研究工作的技术人员具有一定的借鉴意义。     

1000MW超超临界空冷汽轮机研制

简述了1000MW超超临界空冷汽轮机的技术参数及模块化的设计方法,针对1000MW超超临界参数特点和大型机组空冷技术的难点,介绍了机组主汽轮机结构及940mm空冷汽轮机专用末级叶片研发及特点,开发出新型高效节能节水型1000MW超超临界空冷汽轮机组。     

浅谈超超临界火力发电机组控制特点及难点

本文主要介绍大唐宁德电厂2号机组660MW超超临界燃煤发电机组及其控制特点,浅述超超临界发电机组的控制策略和难点,对发电机组投产后控制方面出现的主要问题作出分析和解决。     

超超临界汽轮机关键问题的处理

本文简单介绍了超超临界汽轮机一些关键问题的解决方法。     

关于加快发展超超临界燃煤发电机组的建议

根据我国超超临界燃煤发电机组的发展现状,结合国外发展经验,分析我国超超临界机组发展存在的问题,提出进一步推进我国超超临界燃煤发电机组发展的措施建议。     

超超临界电站锅炉关键材料的新进展

高温材料和性能是制约超超临界(电站)机组发展的关键。讨论了超超临界机组锅炉用铁素体钢、奥氏体钢与镍基合金三类材料的合金化和主要性能,指出随着机组参数的提高,材料的抗蒸汽氧化性能和抗烟气腐蚀性能愈加重要,从而促进了新型奥氏体热强钢和镍基合金的发展;指出了随着超超临界技术的采用,还需要对相关材料进行大量基础试验,特别是长期试验,以积累相关数据和经验。     

1000MW超超临界汽轮机转子锻件研制

国内1000MW级超超临界机组设计、制造和运行,在"十一五"期间已经取得国产化成功,但对于其中的核心锻件如高压、中压、低压转子等,一直未实现国产化;同时,国外对核心锻件的制造技术也采用严密封锁,拒绝相关的锻件制造技术的出口。上海重型机器厂有限公司通过自主创新,实现了MW级超超临界汽轮机转子锻件的制造技术突破,使MW级超超临界汽轮机转子锻件实现了国产化。     

大型超临界火电站主蒸汽阀门的设计及研制

介绍了大型超临界火电站主蒸汽阀材料选择、结构设计、设计计算及应力分析，并阐述了阀门安装使用及维护方法。     

Vibration control of a spinning disk

An active control scheme based on the transfer function model is proposed to suppress the vibration of a disk spinning both in the sub- and super-critical speed ranges. The feedback controller consists of a space-fixed point sensor and a point actuator, which are not on any nodal circle of the freely spinning disk. The point sensor can measure both the displacement and the pitching slope of the spinning disk. In the sub-critical speed range, a controller measuring the displacement information alone works well in suppressing the disk vibration. However, such a controller is not only unable to suppress the disk vibration in the super-critical speed range, it may destabilize the spinning disk instead. In order to control a disk in the super-critical speed range, a controller using both the displacement and slope information is proposed. The range of the control gain parameter which renders the spinning disk asymptotically stable can be determined by a stability analysis. The success of such a controller is demonstrated via numerical simulations.     

超临界 CO2清洗在精微制造领域中研究与应用

阐述了超临界CO2流体特性,超临界表面清洗的原理、工艺以及在清洗过程中的独到优势,概述了超临界CO2流体在半导体微电子、精密机械以及其他领域清洗行业中的研究进展与应用,并对超临界清洗技术未来发展趋势进行了展望。     

Unbalance Response of a Super-Critical Rotor Supported by Foil Bearings—Comparison with Test Results©

This article compares theoretical and experimental results on the unbalance response of a super-critical rotor supported by two kinds of gas foil bearings. Analysis of the super-critical rotor is performed with viscoelastic foil bearings (VEFB) and conventional bump foil bearings and compared with early published experimental data. The vibration orbits obtained by theoretical investigation on the viscoelastic foil bearings (VEFB) and the conventional bump foil bearings are compared with the experimental vibration orbits of the super-critical rotor supported by both foil bearings. A numerical analysis program can calculate the static and dynamic characteristics of the elastically supported gas foil bearing using the measured stiffness and damping of the elastic foundation. After the stiffness and damping of both foil bearings are calculated using the perturbation method, vibration orbits of the flexible rotor modeled by the finite element method are calculated. Vibration orbits calculated by numerical analysis agree well with experimental data when the vibration amplitude is small and the rotating speed is below the bending critical speed. The numerical results also show that the enhanced structural damping of the elastic foundation reduces vibration near the bending critical speed.     

双背压凝汽器抽空气管路改进的可行性研究

国内安装的600MW、1000MN超临界、亚临界凝汽式机组,汽轮机为三缸四排汽汽轮机,配套的是双背压凝汽器。为了响应国家节能要求,对凝汽器高低背压设计原理及存在的问题进行分析,对所采用的抽空气管路进行分析,提出技改方案和安全风险控制要求,为各电力公司的节能工作提供了理论依据,同时使双背压凝汽器的设计更加完善。     

超临界截止阀阀体强度应力分析

以超临界截止阀阀体为例，应用三维有限元应力分析软件进行应力分析。提供了一种对于复杂模型零件进行应力分析的模式。     

超临界叶栅的反问题算法及其在任意回转面上的推广

本文在[9,10]的基础上,给出了一个超临界叶栅的反问题计算方法,文中采用了以（ψ、φ）为坐标的对数型全速度方程,并给出了二元超临界叶栅的算例。同时还导出了适合任意回转面超临界叶片栅反问题算法的方程和边界条件。使本文提供的二元计算程序很容易地推广到用来计算回转面上的超临界叶栅。     

摩擦自激系统的分岔控制研究

研究应用Washout滤波器技术对摩擦系统自激振动的分岔控制.首先确定需要引入的Hopf分岔点,然后按Hopf分岔条件确定滤波器的线性增益和非线性增益系数,将系统的亚临界Hopf分岔变为超临界Hopf分岔,使受控系统产生的自激振动幅值大大降低.理论分析和数值仿真表明Washout滤波器法在分岔控制中的有效性.     

轴承-转子系统自激振动及迟滞、跳跃现象

采用长轴承解析模型研究滑动轴承支承的平衡单盘柔性转子-轴承系统的自激振动，把结合打靶法的延续算法应用于柔性平衡转子-轴承系统Hopf分叉后周期解的追踪和求解上，基于Floquet理论对极限环的稳定性加以分析，研究了不同系统参数下产生极限环的Hopf分叉的不同过程及特性，分别对超临界及亚临界Hopf分叉进行了描述和分析，结果表明亚临界Hopf分叉会引起突跳、迟滞现象，并可引发转子系统难以预测的振动故障，在设计中应避免这种参数条件。     

Application of ISO4359 for discharge calculation in a narrow flume

Flumes with either width contractions or raised beds to force modular flow conditions (i.e. a transition from sub- to super-critical flow) are a widely used instrument for the measurement of flow rate. The conservation of mass, written as the continuity equation, and the conservation of energy are combined with the existence of a critical depth point to derive a theoretical equation for the discharge as a function of the upstream water depth. This derivation requires a number of assumptions regarding the flow both upstream and in the throat of the contraction. The international standard covering the use of such flumes, ISO4359, places restrictions on the upstream position at which the water depth should be measured, which this work shows to be unnecessary, at least for the small (100 mm throat width) flumes examined. The assumption that critical depth occurs at the end of the flume throat is also shown to be incorrect, but has negligible effect on discharge calculation using the ISO4359 method.