抽真空对独立外缸低压模块端汽封间隙的影响分析  

Analysis on the influence of vacuum raising on shaft sealing clearance at turbine with independent low pressure exhaust structure

作　　者：段增辉[1] 谢诞梅[2] 邱健[1] 张立军 欧楚雄[1] 王涛[1] 沈政[1] DUAN Zenghui;XIE Danmei;QIU Jian;ZHANG Lijun;OU Chuxiong;WANG Tao;SHEN Zheng(Dongfang Turbine Co.,Ltd.,Deyang 618000,China;School of Power and Mechanical Engineering,Wuhan University,Wuhan 430072,China;Liaoning Hongyanhe Nuclear Power Co.,Ltd.,Dalian 116000,China)

机构地区：[1]东方汽轮机有限公司,四川德阳618000 [2]武汉大学动力与机械学院,湖北武汉430072 [3]辽宁红沿河核电有限公司,辽宁大连116000

出　　处：《热力发电》2022年第8期130-135,共6页Thermal Power Generation

基　　金：国家自然科学基金项目(51776142)。

摘　　要：以某独立外缸结构汽轮机低压模块为研究对象,对低压内缸及汽封体等部件在抽真空阶段的变形进行了分析和计算。为了理清抽真空阶段所受的重力、真空力、热影响等因素对低压端汽封间隙的影响,分步骤施加以上3种载荷进行有限元分析。结果表明:在重力作用下,低压内缸产生整体下沉两头上翘的变形;在真空力作用下,端汽封随汽缸进一步下沉,底部间隙变大;在投低压缸喷水情况下,高温轴封蒸汽对端汽封及低压内缸加热,端汽封随汽缸整体抬升,底部间隙减小;在真空力、热影响联合作用下,端汽封底部间隙减小0.061~0.105 mm;在投入喷水情况下,整个抽真空阶段对低压端汽封间隙的影响并不大。By takingthe low pressure(LP)module of a turbine with independent structure as the research object,the deformation of the LP cylinder inner casing and shaft sealing in vacuum raising stageis numerically analyzed.In order to clarify the influence of gravity,vacuum force and thermaleffect on shaft sealing clearance of the LP cylinder,the above three loads are added on the LP cylinder step by step for finite element analysis.The results show that,under the action of gravity,the LP cylinder inner casing will sink as a whole and tilt at both ends.Under the action of vacuum force,the shaft sealing sinks further with the cylinder,and the bottom gap becomes larger.When the LP cylinder runs with water spraying,the high temperature sealing steam heats the shaft sealing and LP cylinder inner casing,theshaft sealing riseswith the cylinder as a whole,and the bottom clearance decreases.Under the combined action of vacuum force and heat effect,the bottom clearance of the shaft sealing reducesby 0.061~0.105mm.In the case of water spraying,the whole vacuum raising stage has little effect on the clearance of the LP shaft sealing.

关 键 词：汽轮机 端汽封 独立外缸结构 

分 类 号：TK262[动力工程及工程热物理—动力机械及工程]