Comparison of Performances of Full-Speed Turbine and Half-Speed Turbine for Nuclear Power Plants
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摘要: 核电汽轮机分为全速汽轮机和半速汽轮机,转速选择的不同会导致很多方面的差异,因此转速的选择是核电汽轮机选型中的重点。通过计算典型1000 MW级核电半速汽轮机和全速汽轮机的焓降型相对内效率来比较两种机型的热经济性,计算半速汽轮机与全速汽轮机末级叶片的水滴的相对速度来比较半速汽轮机与全速汽轮机的防水蚀的性能。计算结果表明,半速汽轮机的相对内效率略高于全速汽轮机的相对内效率;从安全性能来看,尤其是在防止水蚀的性能方面,半速汽轮机要好于全速汽轮机。Abstract: The steam turbines of nuclear power plants can be divided into the full-speed turbine and half-speed turbine.Different speed leads to differences in many aspects.Therefore,the rational speed is the key point in the selection of steam turbines.This paper contrasts the economy between the half-speed turbine and full-speed turbine,by calculateing the relative internal efficiency of half-speed and full-speed steam turbines with the typical level of 1000 megawatt.At the same time,this paper also calculate the relative speed of high speed water drops in the last stage blade of half-speed turbine and full-speed turbine,to contrast the water erosion between the half-speed turbine and full-speed turbine.The results show that the relative internal efficiency of half-speed turbine is higher than that of the full-speed turbine,and that the security especially the ability of preventing water erosion of half-speed turbine is better than that of the full-speed turbine.
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Key words:
- Steam turbine /
- Half-speed /
- Full-speed /
- Nuclear power plants
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