| 500MW汽轮机蒸汽冷却改造的数值分析 |
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| 引用本文： | 倪永中,徐鸿,张乃强. 500MW汽轮机蒸汽冷却改造的数值分析[J]. 动力工程, 2011, 31(2) |
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| 作者姓名： | 倪永中 徐鸿 张乃强 |
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| 作者单位： | 华北电力大学电站设备状态监测与控制教育部重点实验室,北京,102206 |
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| 摘 要： | 为了降低转子由高温蠕变导致的永久弯曲变形速率,以俄制500 MW汽轮机对称进汽结构中压转子的冷却装置为研究对象,利用Fluent软件分析了不同冷却蒸汽流量对再热蒸汽流场的干扰程度以及对机组热效率的影响.在不同冷却蒸汽温度下,对转子前两级的表面温度分布以及转子的高温蠕变速率进行了计算.结果表明:当冷却蒸汽流量在20 t/h以下时,其对再热蒸汽流场的影响很小;冷却蒸汽的最小流量应该大于0.65 t/h,否则在第一级叶轮根部会发生蒸汽逆向流动;当冷却蒸汽流量在允许范围内变化时,流量对转子的冷却效果影响不大,影响转子温度场的主要因素是冷却蒸汽温度;当冷却蒸汽温度分别为470℃、480℃和490℃时,可以分别使转子的安全运行时间延长至19.0年、14.3年和11.0年.
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| 关 键 词： | 汽轮机 转子 冷却改造 蠕变 流场 |
Numerical Simulation on Retrofitted Steam Cooling Unit of a 500MW Steam Turbine |
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| NI Yong-zhong , XU Hong , ZHANG Nai-qiang. Numerical Simulation on Retrofitted Steam Cooling Unit of a 500MW Steam Turbine[J]. Power Engineering, 2011, 31(2) |
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| Authors: | NI Yong-zhong XU Hong ZHANG Nai-qiang |
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| Affiliation: | NI Yong-zhong,XU Hong,ZHANG Nai-qiang(Key Labortary of Condition Monitoring and Control of Power Plant Equipment,Ministry of Education,North China Electric Power University,Beijing 102206,China) |
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| Abstract: | In order to reduce the permanent bend deformation rate of rotor caused by high temperature creep process,and taking the cooling unit for symmetrically-structured medium-pressure rotor of a 500 MW Russian-made steam turbine as the object of study,influence of varying cooling steam flow on both reheat steam flow field and unit thermal efficiency was analyzed using Fluent software,while temperature distribution on rotor surface at the first two stages and high-temperature creep rate of the rotor calculated at ... |
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| Keywords: | steam turbine rotor cooling unit retrofit creep flow field |
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