烟岗电站水轮机设计

烟岗水电站装有2台单机容量为60MW的水斗式立轴水轮发电机组,电站总装机容量为120MW。对烟岗电站水轮机的基本特性、各主要部件的结构设计和应用功能做了简要的介绍,同时对水轮机的安全保护装置的组成部分和各组成部分的动作方式进行了做了简要的说明。     

无资料地区中小流域梯级水库设计洪水组成

鸭嘴河流域属无资料地区小流域。烟岗水电站是鸭嘴河水电梯级开发的第二级电站,在其上游8km有该流域的控制性工程,“龙头”水库—布西水库,对下游烟岗电站的设计洪水应充分考虑上游具有多年调节性能的布西水库的调洪作用影响,采用地区组成法计算受布西水库影响的设计洪水。     

下坂地电站水轮机参数及机型选择

针对下坂地水电站的具体工程特点,通过综合比较、分析,确定了下坂地水电站的水轮机主要参数和机型,为中高水头混流式水轮机的选型提供参考。     

大型贯流式水轮机组安装技术及可视化

贯流式水轮机是开发低水头水能资源和潮汐能的最佳机型,文章结合我国南方某贯流式水电站的建设,介绍了大型贯流式水轮机组结构特点和安装技术,用3Ds max实现了贯流式水轮机组安装工艺的可视化,对同类机组的安装有指导意义。     

小浪底水电站水轮机抗磨蚀措施与实践

经过近几年的运行实践表明,小浪底水电站水轮机所采取的抗磨蚀措施是基本成功的。本文总结了小浪底电站在水轮机抗磨蚀方面所采用的技术措施,以促进这些措施的推广应用。     

小浪底水电站水轮机抗磨蚀措施与实践

经过近几年的运行实践表明，小浪底水电站水轮机所采取的抗磨蚀措施是基本成功的。本文总结了小浪底电站在水轮机抗磨蚀方面所采用的技术措施，以促进这些措施的推广应用。     

水轮发电机组惯性比率对调节系统稳定性的影响

水轮发电机组惯性比率R_1作为衡量水电站引水系统和机组要求的综合指标,其值对水电站的设计和运行有重要影响,不同类型的水轮发电机组,其惯性比率的范围往往也有较大差别。为了研究常规水电站合理的机组惯性比率范围,对部分已运行电站的机组惯性比率进行统计分析,选取几种型号的水轮机,研究了不同类型机组的惯性比率对水轮机调节系统稳定性的影响。结果表明,水轮机调节系统的稳定性和调节动态品质不仅与调速器参数选取有关,机组惯性比率也起着决定性作用,建议设计常规水电站的机组惯性比率最好不超过0.65。这为水电站设计和机组运行提供了借鉴和参考。     

安康水电站水轮机运行性能优化途径

安康水电站近年水轮机过流部件损坏严重,影响电站安全运行。分析其原因,主要是运行工况欠佳、水轮机补气效果不好等原因所致。应采取改善运行工况,改进补气措施、提高检修水平等技术措施,以达到优化水轮机运行性能的目的。     

烟岗水电站配水环管充水保压值

烟岗水电站发电额定水头600m,最大动水头720m,为高水头冲击式水轮机组,配水环管及其外围钢筋混凝土结构的设计关系到整个电站的运行和安全。根据计算结果,研究了不同工况和采用不同保压值方案下配水环管及其外围钢筋混凝土结构联合受力状况,并结合已成工程经验,综合论证分析,确定出配水环管充水保压值。     

考虑水电站水力瞬变流特性的水轮机选型

针对不同的水轮机比选型式对长引水式水电站水力—机械系统的水力瞬变流分析与控制存在不同程度影响的问题,基于水力瞬变流计算和稳定性分析仿真模型,从水电站水力—机械系统瞬变流特性角度探讨了水轮机选型中的关键技术问题和研究方法,以全面掌握不同水轮机比选型式的水力特性及其对水力瞬变流的影响。结合长引水式水电站,考虑两种不同的水轮机比选型式,分析了同一水轮机在不同工况点及不同水轮机在相近工况点运行对调节保证参数和运行稳定性分析的影响程度,为水轮机的优化选型提供了可靠依据。     

混流式水轮机比转速与额定水头非线性统计分析

水轮机的选型设计在水电站设计中至关重要。依据国内近十年来投产的大中型混流式水轮机设计资料,采用非线性回归统计方法统计分析了混流式水轮机比转速与额定水头之间的关系,得到了不同水头段、不同单机容量时比转速与额定水头间的统计公式,并绘制了置信区间和预测区间。所得结果对混流式水轮机的选型设计具有一定参考价值。     

A review of impulse turbines for wave energy conversion

Oscillating Water Column based wave energy plants convert wave energy into low pressure pnuematic power in the form of bi-directional air flows. Air turbines which are capable of rotating uni-directionally in bi-directional air flow, otherwise also known as self-rectifying turbines, are used to extract mechanical shaft power which is further converted into electrical power by a generator. This paper reviews the state of the art in self-rectifying impulse air turbines. New results on optimum parameters for the fixed-guide-vane impulse turbine are also presented. Starting characteristics and conversion efficiencies of two types of impulse turbines are compared with the well known Wells turbine.     

Performance estimation of bi-directional turbines in wave energy plants

Oscillating water column(OWC)based wave energy plants have been designed with several types of bidirec-tional turbines for converting pneumatic power to shaft power.Impulse turbines with linked guide vanes andfixed guide vanes have been tested at the Indian Wave Energy plant.This was after initial experimentation withWell's turbines.In contrast to the Well's turbine which has a linear damping characteristic,impulse turbines havenon-linear damping.This has an important effect in the overall energy conversion from wave to wire.Optimizingthe wave energy plant requires a turbine with linear damping and good efficiency over a broad range of flow co-efficient.This work describes how such a design can be made using fixed guide vane impulse turbines.The In-dian Wave Energy plant is used as a case study.     

On applicability of reciprocating flow turbines developed for wave power to tidal power conversion

Tidal power generation with reciprocating turbines in a simple system is investigated on a performance simulation in order to enlarge the capability of practical use of tidal power with extra-low head and time-varying energy density characteristics. Four reciprocating turbines, which are two types of impulse and a Wells developed for wave power conversion systems, and a cross-flow type of Darrieus for extra-low head hydropower are focused for utilizing extra-low head tidal power. Their turbine characteristics in a unidirectional steady flow obtained by physical test models are compared in non dimensional forms and power plant performance with the turbines are numerically simulated on equivalently scaled turbines based on the low of similitude on turbine performance with the non dimensional characteristics under one of the simplest controls in combination with suitable reservoir ponds area. The output of the power plant depends on tidal difference and a pond inundation area. The results are summarized and discussed on the averaged electric output of the power plant and the optimum scale of pond inundation area.     

Comparative study of turbines for wave energy conversion

IlltnductionSeveral of the wave energy devices cuntiy stUdiedin the United kingdom, Japan, POhogal, India and othercountries make use of the principle of the oscillatingwater-air coltUnn for convening wave energy to lowPneqmatic energy Which in tUrn can be converted intomechAncal energy. In this case, the developmellt of a bidirechonal air theme has come lip as an importantProblem. So far, a number of self-rechfying air onnesWith different configurations have been ProPOsed, and a; Wells…     

A new approach for enhancing performance of a gas turbine (case study: Khangiran refinery)

There are various methods which are commercially available for turbine air inlet cooling aiming to improve gas turbine efficiency. In this study a new approach has been proposed to improve performance of a gas turbine. The approach has been applied to one of the Khangiran refinery gas turbines. The idea is to cool inlet air of the gas turbine by potential cooling capacity of the refinery natural-gas pressure drop station. The study is part of a comprehensive program aimed to enhance gas turbines performance of the Khangiran gas refinery. The results show that the gas turbine inlet air temperature could be reduced in range of 4–25 K and the performance could be improved in range of 1.5–5% for almost 10 months.     

东方空冷600MW两排汽汽轮机的设计

在我国西北地区由于水资源严重短缺,而这些地区又富产煤,在我国以煤电为主的能源结构情况下,大力发展空冷机组是一条必由之路。国家已将建设大型空冷电站列入“十一五”规划纲要。我国空冷技术在20世60年代开始起步,经过多年的发展,在各个方面均取得了丰硕的成果,特别是在空冷汽轮机的设计方面积累了丰富的经验,同时随着国家对节能环保要求的进一步提高,开发高参数、大容量的高效空冷汽轮机已到了水到渠成的时候。该文就大型空冷600MW两排汽汽轮机设计中的关键技术如机型、容量、效率、末级叶片、排气装置、系统配置等进行论述。实践证明,东方空冷两排汽汽轮机组设计先进,可靠性高。     

新型海上风力发电及其关键技术研究

回顾国外海上风力发电场的发展,针对随着海水深度增加导致海上风力机成本急剧上升的矛盾,引入海上漂浮式风力机概念,并详细介绍其结构和特点,通过系统介绍海上漂浮式风力机组成部分和设计制造中的关键技术,最后得出海上漂浮式风机是一种潜力巨大的新型风力发电技术,值得进一步深入研究。同时,针对我国陆、海资源的具体情况,较为系统地提出了海上漂浮式风力机研究的需要关注的关键问题,指出了该研究所具有的巨大社会经济价值。     

Assessing the seismic wavefield of a wind turbine using polarization analysis

Ambient seismic noise can often be seen as problematic but with the right analysis can act as a tool to image the Earth. Wind turbines are known to generate low frequency vibrations; however, the wave types that are generated are currently unknown. Characterizing these vibrations will allow wind turbines to be used as a seismic source and be of value to geotechnical applications and seismic interferometry. This paper uses polarization analysis of the seismic wavefield around a small wind turbine to identify the type of wave being generated by the turbine and to clarify the source. The seismic data recorded 190 m from the wind turbine are processed using a window length of 0.1 s and bandpass filtered on a selection of frequency ranges. Polarization analysis is performed for two different wind speed ranges, in order to show the variation of wave characteristics between operational and non‐operational modes of the wind turbine. Polarized surface waves are identified as the predominant wave type at blade rotation harmonics, making this work particularly relevant to multichannel analysis of surface waves and seismic interferometry. Copyright © 2017 John Wiley & Sons, Ltd.