CPR1000核电汽轮机高压缸甩负荷工况热应力及变形分析
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摘要
以CPR1000核电半速汽轮机高压缸为研究对象,根据机组高压缸甩负荷工况蒸汽参数曲线及热平衡说明书,采用第三类边界条件对高压缸进行有限元计算,分析了甩负荷工况前后高压缸的温度场、热应力、接触压力、变形量等强度指标。研究结果表明:甩负荷时,高压缸内外壁面温差降低,甚至出现负温差(-8℃),主要温差形式为轴向温差;高压缸在启动阶段进入额定负荷及甩负荷阶段出现应力峰值,峰值为211. 5和116 MPa,但在甩负荷时中分面接触压力有所增加,汽密性较好。
With a CPR 1 000 nuclear half-speed steam turbine as an object,the finite element method is used to calculate the temperature field、stress field、contact pressure and deformation of HP casing in load rejection condition by using the third boundary condition according to the steam parameter curves of the load rejection condition and heat balance diagram. Results show that: the temperature difference between the inner surface and the outer surface of HP casing is reduced,and even negative temperature difference occurs during the load rejection condition,with the main temperature gradient in the axial direction. Two stress peaks occur in the rated load and the load rejection stage,respectively. The contact pressure of the flange joint surface increases in the load rejection condition and the leak-tightness is very good.
With a CPR 1 000 nuclear half-speed steam turbine as an object,the finite element method is used to calculate the temperature field、stress field、contact pressure and deformation of HP casing in load rejection condition by using the third boundary condition according to the steam parameter curves of the load rejection condition and heat balance diagram. Results show that: the temperature difference between the inner surface and the outer surface of HP casing is reduced,and even negative temperature difference occurs during the load rejection condition,with the main temperature gradient in the axial direction. Two stress peaks occur in the rated load and the load rejection stage,respectively. The contact pressure of the flange joint surface increases in the load rejection condition and the leak-tightness is very good.
引文
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[7]史进渊,杨宇,邓志成,等.超临界和超超临界汽轮机汽缸换热系数的研究[J].动力工程,2006(1):1-5.SHI Jin-yuan,YANG Yu,DENG Zhi-cheng,et al. Study on theheat transfer coefficient of supercritical and ultra supercriticalsteam turbine casings[J]. Power Engineering,2006(1):1-5.
[8]徐济鋆.沸腾传热和气液两相流[M].北京:原子能出版社,2001.XU Ji-yun. Boiling heat transfer and gas-liquid two-phase flow[M]. Beijing:Atomic Energy Press,2001.
[9] LI Yi-ming,LI Zhong-hua,WANG Hua. The finite element analysisof temperature field and thermal stress of a 50 MW steam turbinecasing in a power plant[J]. Thermal Power Generation,2003(9):21-24.
[10] VISWANATHANR R,BAKKER W. Materials for ultrasupercriti-cal coal power plants turbine materials:Part 11[J]. Journal ofMaterials Engineering and Performance,2001,10(1):96-10.
[2]曹胜平.汽轮机高压缸强度分析及改进[D].武汉:武汉理工大学,2012.CAO Sheng-ping. Turbine high pressure casing strength analysis andimprovement[D]. Wuhan:Wuhan University of Technology,2012.
[3]周涛,张明,张蕾,等.中国核电汽轮机的参数及其发展趋势研究[J].中国电业(技术版),2012(2):43-47.ZHOU Tao,ZHANG Ming,ZHANG Lei,et al. China's nuclearpower turbine parameters and its development trend[J]. China E-lectric Power Technology Board,2012(2):43-47.
[4]侯修群,谢诞梅,黄祥君,等.核电汽轮机高压缸法兰接合面接触分析[J].汽轮机技术,2016,58(2):89-92.HOU Xiu-qun,XIE Dan-mei,HUANG Xiang-jun,et al. Contact a-nalysis of flange joints in high pressure casing of nuclear turbine[J]. Steam Turbine Technology,2016,58(2):89-92.
[5]俞成立. 1 000 MW汽轮机组甩负荷实验分析[J].华东电力,2007,35(6):32-34.YU Cheng-li. 1 000 MW steam turbine load rejection experiment a-nalysis[J]. East China Electric Power,2007,35(6):32-34.
[6]王恭义,程凯,吴晓明,等.某汽轮机甩负荷运行工况强度分析[J].计算机辅助工程,2011(2):118-122.WANG Gong-yi,CHENG Kai,WU Xiao-ming,et al. A steam tur-bine load rejection operating conditions strength analysis[J]. Com-puter Aided Engineering,2011(2):118-122.
[7]史进渊,杨宇,邓志成,等.超临界和超超临界汽轮机汽缸换热系数的研究[J].动力工程,2006(1):1-5.SHI Jin-yuan,YANG Yu,DENG Zhi-cheng,et al. Study on theheat transfer coefficient of supercritical and ultra supercriticalsteam turbine casings[J]. Power Engineering,2006(1):1-5.
[8]徐济鋆.沸腾传热和气液两相流[M].北京:原子能出版社,2001.XU Ji-yun. Boiling heat transfer and gas-liquid two-phase flow[M]. Beijing:Atomic Energy Press,2001.
[9] LI Yi-ming,LI Zhong-hua,WANG Hua. The finite element analysisof temperature field and thermal stress of a 50 MW steam turbinecasing in a power plant[J]. Thermal Power Generation,2003(9):21-24.
[10] VISWANATHANR R,BAKKER W. Materials for ultrasupercriti-cal coal power plants turbine materials:Part 11[J]. Journal ofMaterials Engineering and Performance,2001,10(1):96-10.