启停运行工况下超超临界机组高压缸平衡活塞区域结构强度与间隙变化分析
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摘要
以机组运行历史数据为基础,考虑启停及稳态运行中的弹塑性力学和蠕变行为,应用ABAQUS有限元软件分析高压缸平衡活塞区域启停工况下的温度场、应力场及位移场分布,并选取2组节点分析平衡活塞区域启停工况下温度、应力及径向间隙的变化趋势。结果表明:启动过程中应力及径向间隙变化较大,稳态运行与停机过程中应力及径向间隙变化较小;在启动开始阶段平衡活塞中部区域径向间隙最小,但尚未产生碰摩,此径向间隙值可作为平衡活塞区域安全裕度,以供设计参考。
Based on history data of a power unit,the temperature field,stress field and displacement field in its HP cylinder balance piston area were analyzed in the process of start,stop and steady state operation,considering the elastic-plastic mechanics and creep behavior using ABAQUS finite element method,with focus on the varation tendency of the temperature,stress and radial clearance by taking two key points as the objects of study.Results show that the stress and radial clearance change greatly in start period,but vary slightly in steady state operation and stop period.Moreover,the minimum clearance appears in the central area of balance piston during start period,where no rubbing phenomenon would be observed,which therefore can be used as a pre-set margin for the balance piston area,and may serve as a reference for relevant designs.
Based on history data of a power unit,the temperature field,stress field and displacement field in its HP cylinder balance piston area were analyzed in the process of start,stop and steady state operation,considering the elastic-plastic mechanics and creep behavior using ABAQUS finite element method,with focus on the varation tendency of the temperature,stress and radial clearance by taking two key points as the objects of study.Results show that the stress and radial clearance change greatly in start period,but vary slightly in steady state operation and stop period.Moreover,the minimum clearance appears in the central area of balance piston during start period,where no rubbing phenomenon would be observed,which therefore can be used as a pre-set margin for the balance piston area,and may serve as a reference for relevant designs.
引文
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[14]史进渊,杨宇,邓志成,等.超临界和超超临界汽轮机汽缸传热系数的研究[J].动力工程,2006,26(1):1-5.SHI Jinyuan,YANG Yu,DENG Zhicheng,et al.Casing's heat transfer coefficients of supercritical and ultra-supercritical steam turbines[J].Journal of Power Engineering,2006,26(1):1-5.
[15]史进渊,邓志成,杨宇.超临界和超超临界汽轮机转子叶根槽传热系数的计算[J].动力工程学报,2010,30(7):478-484.SHI Jinyuan,DENG Zhicheng,YANG Yu.Calculation of heat transfer coefficients of blade grooves for supercritical and ultra-supercritical steam turbine rotors[J].Journal of Chinese Society of Power Engineering,2010,30(7):478-484.
[2]韩炜,何青,沈克伟,等.1 000 MW超超临界汽轮机转子启动过程的热应力分析[J].华电技术,2013,35(2):27-32.HAN Wei,HE Qing,SHEN Kewei,et al.Analysis on thermal stress of 1 000MW ultra supercritical turbine rotor during startup[J].Huadian Technology,2013,35(2):27-32.
[3]孟召军,王光定,陈奇.汽轮机变工况下高压内缸变形分析[J].汽轮机技术,2015,57(4):289-291.MENG Zhaojun,WANG Guangding,CHEN Qi.The deformation analysis of steam turbine high pressure inner cylinder in off-design conditions[J].Turbine Technology,2015,57(4):289-291.
[4]JARMOWSKI D,CAPOZZI P,VOGT J,et al.Investigation of advanced lifetime calculation procedure for steam turbines in flexible operation[C]//Proceedings of ASME Turbo Expo 2017:Turbomachinery Technical Conference and Exposition.Charlotte,North Carolina,USA:American Society of Mechanical Engineers,2017:V07AT31A010.
[5]ZHU Xuanchen,CHEN Haofeng,XUAN Fuzhen,et al.Cyclic plasticity behaviors of steam turbine rotor subjected to cyclic thermal and mechanical loads[J].European Journal of Mechanics-A/Solids,2017,66:243-255.
[6]JI Dongmei,SUN Jiaqi,DUI Yue,et al.The optimization of the start-up scheduling for a 320 MW steam turbine[J].Energy,2017,125:345-355.
[7]喻超,王炜哲,张军辉,等.超超临界机组高压内缸蠕变强度分析[J].动力工程学报,2014,34(5):365-370.YU Chao,WANG Weizhe,ZHANG Junhui,et al.Creep strength analysis for high-pressure inner casing of ultra-supercritical units[J].Journal of Chinese Society of Power Engineering,2014,34(5):365-370.
[8]徐浩,王宇翔,杨彦磊,等.汽轮机阀门高温蠕变计算有限元单元类型选择[J].热力透平,2016,45(3):216-220.XU Hao,WANG Yuxiang,YANG Yanlei,et al.Finite element selection of high temperature creep analysis for steam turbine main steam valve[J].Thermal Turbine,2016,45(3):216-220.
[9]BANASZKIEWICZ M.Numerical investigation of creep behaviour of high-temperature steam turbine components[J].Transactions of the Institute of FluidFlow Machinery,2012,124:5-15.
[10]STRAKA F,ALBL P,PNEK P.Creep deformation of high pressure steam turbine part[J].Applied Mechanics and Materials,2015,732:187-190.
[11]WU Shifang,CHEN Yongzhao,YANG Yanlei,et al.Validation analysis of high pressure turbine creep deformation for ultra-supercritical steam turbine[C]//Proceedings of ASME Turbo Expo 2017:Turbomachinery Technical Conference and Exposition.Charlotte,North Carolina,USA:American Society of Mechanical Engineers,2017:V008T29A001.
[12]顾泽同,葛永乐,翁中杰,等.工程热应力[M].北京:国防工业出版社,1987:102-110.
[13]吴穹,王炜哲,张军辉,等.超超临界汽轮机中压转子高温蠕变强度分析[J].动力工程学报,2015,35(1):25-29.WU Qiong,WANG Weizhe,ZHANG Junhui,et al.High-temperature creep strength analysis for IP rotor of an ultra-supercritical steam turbine[J].Journal of Chinese Society of Power Engineering,2015,35(1):25-29.
[14]史进渊,杨宇,邓志成,等.超临界和超超临界汽轮机汽缸传热系数的研究[J].动力工程,2006,26(1):1-5.SHI Jinyuan,YANG Yu,DENG Zhicheng,et al.Casing's heat transfer coefficients of supercritical and ultra-supercritical steam turbines[J].Journal of Power Engineering,2006,26(1):1-5.
[15]史进渊,邓志成,杨宇.超临界和超超临界汽轮机转子叶根槽传热系数的计算[J].动力工程学报,2010,30(7):478-484.SHI Jinyuan,DENG Zhicheng,YANG Yu.Calculation of heat transfer coefficients of blade grooves for supercritical and ultra-supercritical steam turbine rotors[J].Journal of Chinese Society of Power Engineering,2010,30(7):478-484.