汽轮机级组特征通流面积的应用  

Application of the Steam Turbine Stage Characteristic Flow Path Area

作　　者：王运民[1] 张伦柱[1] 徐大懋[2] 马海龙[1] 

机构地区：[1]长沙理工大学能源与动力工程学院,湖南长沙410076 [2]中国广东核电集团有限公司,广东深圳518031

出　　处：《热能动力工程》2012年第2期160-164,260-261,共5页Journal of Engineering for Thermal Energy and Power

基　　金：国家重点基础研究发展计划(973计划)基金资助项目(2009CB219803-03)

摘　　要：介绍了汽轮机级组特征通流面积在工程实际应用中的相关表达式,以某火电厂310MW机组为例,对汽轮机级组特征通流面积进行分析。通过计算级组特征通流面积的偏差率和级组的相对内效率,判断汽轮机通流部分的运行状况,得出汽轮机第Ⅰ级组通流面积减小、其它级组工作正常、第7段和第8段抽汽压力测量值不准确、以及第5段和第6段抽汽口可能有热蒸汽漏入的结论,并提出在机组大修中对重点部位进行检查和处理建议。实践证明,利用级组特征通流面积进行理论分析的结果与实际相吻合。Described were relevant expressions of steam turbine stage characteristic flow path areas in practical engineering applications.With a 310 MW unit in a thermal power plant serving as an example,an analysis of the steam turbine stage characteristic flow path area was conducted.Through a calculation of the deviation rate of the stage characteristic flow path area and the relative internal efficiency,the operating state of the steam turbine flow path was judged,arriving at a conclusion that the flow path area of No.Ⅰ stage group of the steam turbine decreases,other stage groups are in normal work,the steam extraction pressure measurements of No.7 and 8 section are not correct and it is possible that a certain amount of hot steam is leaked into the steam turbine from steam extraction ports of No.5 and 6 section.On these basis,the authors have offerred proposals to conduct an inspection and treatment during the overhaul of the steam turbine unit.It has been proven by the practice that the theoretical analytic results by using stage group characteristic flow path areas are in good agreement with the practical ones.

关 键 词：火电厂 汽轮机 级组 通流能力 特征通流面积 应用 

分 类 号：TK261[动力工程及工程热物理—动力机械及工程]