共查询到20条相似文献,搜索用时 93 毫秒
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低压排汽缸的气动性能影响汽轮机组的功率和效率。文章对单独排汽缸和汽轮机低压末级整圈与排汽缸耦合进行了数值分析对比,发现汽轮机末级动叶出口流场的不均匀性和强烈的预旋影响低压排汽缸的气动性能。高性能的低压排汽缸设计应该考虑末级与低压排汽缸流场之间的相互作用。 相似文献
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大功率汽轮机低压排汽缸的气动性能分析和设计对于提高机组的经济性具有非常重要的作用。低压末级与排汽缸间的相互作用以及排汽缸内的复杂结构导致排汽缸具有典型的非定常和非周期性的流动特性。介绍了排汽缸的基本结构特点,综述了国内外在排汽缸气动设计和性能分析方面的研究进展,给出了西安交通大学TurboAero研究团队在大功率汽轮机低压排汽缸全三维性能分析和气动设计方面的研究结果,最后讨论了大功率汽轮机排汽缸方面的研究展望。排汽缸气动性能的影响因素可概括为:末级动叶出口旋流、顶部间隙射流、动叶尾迹和排汽缸几何结构。排汽缸的气动性能研究需要耦合低压缸通流结构开展,充分考虑通流结构和排汽缸间的相互作用。 相似文献
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以引进的AP 1 000核电汽轮机为例,建立了低压排汽缸的三维模型,考虑到进口参数受末级动叶出口流动的影响,采用了低压末级叶片和排汽缸联合计算的数值模拟方法,详细分析了排汽缸内部的复杂流动情况,分析了该排汽缸三维流动情况和总参数,为核电汽轮机低压排汽缸国产化提供了重要的指导意义。 相似文献
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低压排汽缸的气动特性及参数选择 总被引:1,自引:0,他引:1
文章综合国内外有关汽轮机低压排汽缸的理论与试验方面的文献,对排汽缸的气动特性进行了分析,提出了一些排汽缸气动设计的原则和参数选择的范围。为设计人员设计气动性能合理的排汽缸提供参考。 相似文献
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汽轮机低压缸刚性有限元分析 总被引:3,自引:0,他引:3
采用有限元分析软件MSC.Nastran对某原型600MW机组、改进600MW机组汽轮机低压缸计算模型进行有限元分析,对结果进行比较,验证了不同类型机组低压缸刚度性的优劣。 相似文献
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Dieter Bohn Robert Krewinkel Shuqing Tian 《Frontiers of Energy and Power Engineering in China》2009,3(3):313-320
In order to increase efficiency and achieve a further CO2-reduction, the next generation of power plant turbines will have steam turbine inlet temperatures that are considerably higher
than the current ones. The high pressure steam turbine inlet temperature is expected to be increased up to approximately 700°C
with a live steam pressure of 30 MPa. The elevated steam parameters in the high and intermediate pressure turbines can be
encountered with Ni-base alloys, but this is a costly alternative associated with many manufacturing difficulties. Collaborative
research centre 561 “Thermally Highly Loaded, Porous and Cooled Multi-Layer Systems for Combined Cycle Power Plants” at RWTH
Aachen University proposes cooling the highly loaded turbines instead, as this would necessitate the application of far less
Ni-base alloys.
To protect the thermally highly loaded components, a sandwich material consisting of two thin face sheets and a core made
from a woven wire mesh is used to cover the walls of the steam turbine casing. The cooling steam is led through the woven
wire mesh between the two face sheets to achieve a cooling effect. The wire mesh provides the grid-sheet with structural rigidity
under varying operating conditions. 相似文献
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In order to increase efficiency and achieve a further CO2-reduction, the next generation of power plant turbines will have steam turbine inlet temperatures that are considerably higher than the current ones. The high pressure steam turbine inlet temperature is expected to be increased up to approximately 700°C with a live steam pressure of 30MPa. The elevated steam parameters in the high and intermediate pressure turbines can be encountered with Ni-base alloys, but this is a costly alternative associated with many manufacturing difficulties. Collaborative research centre 561 “Thermally Highly Loaded, Porous and Cooled Multi-Layer Systems for Combined Cycle Power Plants” at RWTH Aachen University proposes cooling the highly loaded turbines instead, as this would necessitate the application of far less Ni-base alloys. To protect the thermally highly loaded components, a sandwich material consisting of two thin face sheets and a core made from a woven wire mesh is used to cover the walls of the steam turbine casing. The cooling steam is led through the woven wire mesh between the two face sheets to achieve a cooling effect. The wire mesh provides the grid-sheet with structural rigidity under varying operating conditions.In the present work, the cooling performance of the grid-sheets will be investigated applying the conjugate heat transfer method to ultra-supercritical live and cooling steam conditions for a section of the cooling structure. The behaviour of the flow and the heat transfer in the grid-sheet will be analyzed in detail using a parameter variation. The numerical results should give a first prediction of the cooling performance under future operating conditions. 相似文献
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分析了某1000MW超超临界汽轮机超高压、高压、中压外缸结构,技术要求,加工难点.针对工件重、尺寸大、刚性差、异形、精度高、密封要求严等特点,拟定了能有效保证加工精度、高效率、低成本的加工方案,技术先进,经济效益显著. 相似文献
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首先对汽轮机相对内效率的概念进行了讨论,然后从汽轮机基本原理出发,推导出一种计算汽轮机各缸相对内效率变化对整机相对内效率影响的计算模型,为更准确地预测汽轮机通流部分改造的热经济效益及汽轮机热经济性诊断提供了理论依据。 相似文献
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汽轮机作为火力发电厂三大主机之一,其安全运行关系着整个系统的经济性和安全性.汽轮机在运行过程中不可避免地会出现很多故障.介绍了火电厂汽轮机的工作原理,总结归纳了汽轮机运行中常见的几种故障及处理措施技术,以期为从事汽轮机运行及检修的人员提供参考. 相似文献