共查询到19条相似文献,搜索用时 218 毫秒
1.
石门水电站运行水头范围为154~234 m,属于高水头水电站,此水头段适合的水轮机最佳型式为混流式水轮机。根据国内外统计公式及资料,并参照国内外相近水头段已建电站的主要参数,通过综合分析比较,确定水轮机比转速、比速系数、单位转速、单位流量和空化系统等机组参数,选择合适的模型转轮,并以此作为设计基础,从而确定电站机组台数、额定转速及安装高程等。本阶段与招标后机组参数的对比情况,以及石门水电站后期的安全稳定运行,均表明石门水电站水轮机参数选择是合理的,可为高水头段的水电站水轮机参数选择提供设计参考。 相似文献
2.
以厄瓜多尔德尔西水电站的水轮机机型及机组参数的选择计算为基础,对500 m水头段采用混流式水轮机及水斗式水轮机进行了机组参数水平、设计制造难度、机组运行稳定性、维护性以及投资等综合比较。参考目前该水头段内的机型应用情况,最终推荐了水斗式水轮机,并在选定的机型下,结合目前中国大中型水轮机制造厂对于本水头段水斗式机组的设计、制造能力,对比计算最终选定该电站最佳的水轮机喷嘴数及主要技术参数。 相似文献
3.
4.
5.
溪洛渡水电站单机额定功率700MW,最大功率770Mw,机组共18台(左右岸地下厂房各9台),水轮机最大水头230m,水头变幅75m。在设计工作中,合理选择水轮机参数对机组乃至电站的高效稳定运行至关重要。介绍了水轮机主要参数可行性研究阶段的设计成果。 相似文献
6.
溪洛渡水电站单机额定功率700HW,最大功率770HW,机组台数18台(左右岸地下厂房各9台),水轮机最大水头230m,水头变幅75m,合理选择水轮机参数对机组乃至电站的高效稳定运行至关重要,本文将介绍水轮机主要参数可行性研究阶段的设计成果。 相似文献
7.
吉沙水电站装机120 MW,额定水头485 m,通过技术经济比较,并结合国内、外制造厂家的设计制造水平,确定机组型式和机组台数及单机容量,合理选择水轮机主要参数,保证了机组的稳定运行。 相似文献
8.
洪家渡水电站最高水头164m,水头变幅高达74m。电站在系统中担任调频、调峰及事故备用任务,运行工况复杂,机组运行稳定性至关重要。洪家渡水电站的机组从参数选择、水轮机流道设计、结构设计、水轮机的模型验收及运行方式等各方面进行了分析研究,并提出了保证稳定性的措施。 相似文献
9.
10.
11.
12.
飞来峡水利枢纽电站位于北江干流的中游,是一座典型的低水头径流式电站。枢纽以防洪为主,同时兼有航运、发电等综合利用的功能。电站水轮机的选择经历了立式轴流机组、国产灯泡贯流式机组及最终通过国际招标选用进口灯泡贯流式机组的过程。飞来峡水利枢纽已竣工发电,对水轮机选择的若干问题进行回顾和总结,并从中得出一些有益的启示,对提高灯泡贯流式机组的应用水平是十分必要的,对今后类似的低水头径流式电站的水轮机选择也具 相似文献
13.
14.
15.
L. L. Simoyu E. I. Efros V. F. Gutorov 《Power Technology and Engineering (formerly Hydrotechnical Construction)》2005,39(4):234-239
The operation of the low-pressure turbine part in variable condensing and extraction regimes is analyzed. The effect of steam
parameters at the inlet to the low-pressure part (in the lower extraction chamber) and of operation of the regulating stage
of the LPP on the level of wetness in the low-pressure stages is determined. It is shown that the moving blades of the last
stages of cogeneration turbines operate under heavier erosion conditions than in condensing turbines. This is one of the main
causes of their intense erosion wear.
__________
Translated from Elektricheskie Stantsii, No. 6, June 2005, pp. 27 – 32. 相似文献
16.
Combination of mathematical and hydraulic modeling methods when analyzing unsteady regimes in canals
N. P. Bestuzheva 《Power Technology and Engineering (formerly Hydrotechnical Construction)》1987,21(8):493-497
Conclusions In a hydraulic substantiation of the designs of channels conveying water to the intakes of diversion hydrostations and having a considerable length and headworks regulation at a gated intake, satisfactory results can be obtained from the combined use of mathematical and hydraulic models.The final goal of using the mathematical model is to check, on the basis of the allowable values of the hydraulic parameters at control sections, the design proposals on selecting the canal cross sections and to find the optimal agreement of the schedules of operating the intake gates with the operating regimes of the turbines, i.e., to develop the basic principles for creating an appropriate automatic control system. For this purpose a model of unsteady flow based on one-dimensional Saint Venant equations is sufficient.The hydraulic model of the part of the channel length adjacent to the hydrostation intake or to the headworks intake makes it possible to analyze the initial period of development of unsteady flow during starting and stopping of the turbines with the characteristic undular oscillation of the wave front characteristic for positive surges and to reveal both the three-dimensional character of the wave itself and the effect on it of the three-dimensional forms of the transition structures; plunge pool, stilling basin, etc.The extreme hydraulic characteristics are determined by the data of both models. As shown for the sample of investigating a diversion channel, the maximum elevation of the level upon stopping the turbines and simultaneous lowering of the gates can be observed either at the time of motion of the undular front of the wave (and then it is recorded on the hydraulic model) or considerably later — at the time of arrival of a wave of the opposite sign at the given control section (and then the data on the increase in the average level on the hydraulic model are extrapolated to the corresponding time determined on the mathematical model). A preliminary estimation of the maximum elevation of the crest of the undular surge above the initial level can be given on the basis of the experimental relations presented in this article.Translated from Gidrotekhnicheskoe Stroitel'stvo, No. 8, pp. 38–41, August, 1987. 相似文献
17.
现代轴流式转轮叶片设计中,奇点分布法因计算工作量大较少采用,但其理论的严谨性,推导的严密性经常用的统计分析法和升力法更符合流体动力场的客观规律,因而可减少研制新轮转的实验工作量和验证实验数据的可靠性,获得优秀水力模型,本文应用计算机技术,结论 体学理论,进行了奇同流式转轮叶片的CAD应用软件的设计与研究。 相似文献
18.
本文分析了我国过去中小型水轮机选型偏重于通用性和低价,未充分考虑发电效益,使用性能落后的转轮,甚至不合理地套用某一机型,致使水轮机长期偏离最优工况区运行,给电站造成了较大的经济损失。近年来,随着水轮机科研成果的增多,新的中小型水轮机系列型谱的建立,为中小型水轮饥选型创造了条件。文章列举了东方电机厂在国内外中小型水轮机中的合理选型以及由此带来的经济效益。 相似文献
19.
大型混流式水轮机转轮裂纹已成为水电行业一个频发的问题,严重威胁机组运行安全。以瀑布沟水电站2,4,6号机组为例,从水力设计、转轮刚度、材料选择、制造工艺、焊材选择、应力等方面开展分析,确定了应力集中为裂纹产生的主要原因。总结了转轮裂纹处理和防范措施,包括加强日常检查、加装应力释放三角铁、开展机组AGC方式下的稳定性测试等。其经验对同类电站设备缺陷的分析研究及修复控制提供了方向与思路,具有一定借鉴意义。 相似文献