核电站大功率汽轮机的最佳末级设计问题

T. Bogomolova, G. A. Ahmadzadeh
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引用次数: 0

摘要

的目的。在获得最大效率的条件下,估算大功率湿式汽轮机末级工作叶片的最有效长度,并在设计模式下对该级参数进行优化。对于这一阶段,根据给定的模型日负荷计划,进行多模式优化,选择运行效率最高的阶段的主要特征。在求解该问题时,采用了水轮机级流动部分蒸汽作为无粘单相工质相对于静止导流装置以叶轮角速度ω旋转的轴对称流动计算方法,并根据mpei的轴对称方法计算损失能量。文章描述了课题的相关性,讨论了使用作者的软件解决任务的特点。给出了不同工作叶片长度的各级的特性及其在标称模式下的计算结果。为在俄罗斯中部地区运行的核电站涡轮机选择的模型每日时间表。给出了按此日调度运行的汽轮机末级变模态的计算结果。工作叶片最大长度的选择不仅受到其强度特性的限制,而且还受到由于最佳可用热降的增加而增加的光栅波损失的限制,或者更确切地说,在子午线附近超音速速度的相关增加。因此,对于高速涡轮to -1200-6,8/50,最后一级的最大效率是在长度为1400毫米时实现的,当涡轮配置了三个两流LPC和四个LPC时。各级的主要特性,如可用热降、反应度等的选择,应在对汽轮机组负荷日调度预测的基础上,考虑汽轮机的多种运行模式。当使用典型的日负荷计划时,与设计模式下的最佳热降相比,当选择增加10%的可用热降时,根据该计划的运行模式范围内的平均内部相对效率高出0.6%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
On the issue of creating the optimal last stage of powerful steam turbines of nuclear power plants
THE PURPOSE. To estimate the most effective length of the working blade of the last stage of a powerful wet-steam turbine in terms of obtaining its maximum efficiency and to optimize the parameters of this stage in the design mode. For this stage, perform multi-mode optimization to select the main characteristics of the stage operating with maximum efficiency according to a given model daily load schedule.METHODS. When solving this problem, the method of calculating the axisymmetric flow of steam in the flow part of the turbine stage as an inviscid single-phase working fluid relative to a stationary guide device and rotating with an angular velocity ω of the impeller used, and the losses energy calculated according to the axisymmetric method of the MPEI.RESULTS. The article describes the relevance of the topic, discusses the features of the use of the author's software in solving the tasks. The characteristics of the stages with different lengths of the working blades presented and the results of their calculation in the nominal mode are given. A model daily schedule selected for a nuclear power plant turbine operating in the central region of Russia. The results of calculations of variable modes of the last stage of the turbine operating according to this daily schedule presented.CONCLUSION. The choice of the maximum length of the working blade is limited not only by its strength characteristics, but also by the increase in wave losses in the gratings due to an increase in the optimal available heat drop, or rather the associated increase in supersonic speeds near the meridional contours. So for a high-speed turbine To-1200-6,8/50 the maximum efficiency of the last stage is achieved at a length of 1400 mm, both when the turbine is configured with both three two-flow LPC and four. Selection of the main characteristics of these stages, such as the available heat drop, the degree of reactivity, etc. it should be made taking into account the variable operating modes of the turbine on the basis of the forecast of daily schedules of loads of turbine units. When using a typical daily load schedule, the average internal relative efficiency in the range of operating modes according to this schedule is higher by 0.6 % when choosing a 10% increased available heat drop compared to the optimal one in the design mode.
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