汽轮机蒸汽管道与阀门及汽缸外缸外表面传热系数的计算模型和计算方法  

Heat Transfer Coefficient Calculation Model and Method for Steam Pipe and Valve as well as Outside Surface of Steam Turbine Outer Casing

作　　者：史进渊 谢岳生 徐佳敏 SHI Jinyuan;XIE Yuesheng;XU Jiamin(Shanghai Power Equipment Research Institute Co.,Ltd.,Shanghai 200240,China)

机构地区：[1]上海发电设备成套设计研究院有限责任公司,上海200240

出　　处：《动力工程学报》2024年第1期25-37,共13页Journal of Chinese Society of Power Engineering

基　　金：航空发动机及燃气轮机重大专项基础研究项目(J2019-V-0014-0109);航空发动机及燃气轮机基础科学中心项目(P2021-A-I-003-002)。

摘　　要：构建了汽轮机蒸汽管道、主汽调节阀与汽缸外缸的外表面传热系数计算模型与计算方法。给出了汽轮机蒸汽管道、主汽调节阀、高压外缸、中压外缸与低压外缸的内表面传热系数以及保温结构外表面与低压外缸外表面的复合传热系数计算公式。建立了汽轮机蒸汽管道、高压外缸与中压外缸的金属内层壁与保温结构外层壁的双层圆筒壁、主汽调节阀金属内层壁与保温结构外层壁的双层球壁以及低压外缸单层圆筒壁的传热过程计算模型。考虑到金属内层壁内表面温度与外表面温度和保温结构外层壁外表面温度均为待定温度,采用迭代法确定这些汽轮机部件的表面温度、传热过程的传热系数与热流密度。完成了汽轮机蒸汽管道、主汽调节阀、高压外缸、中压外缸与低压外缸的外表面传热系数计算分析的应用实例,得出了这些汽轮机部件传热过程金属内层壁外表面的传热系数、热流密度与等效表面传热系数的计算结果,为这些汽轮机部件温度场与应力场的有限元数值计算提供了传热边界条件。The heat transfer coefficient calculation models and methods for outer surface of steam pipe,main stop valve,control valve and outer casing of steam turbines were established.The heat transfer coefficient calculation formulas for inner surface of steam pipe,main stop valve,control valve,high pressure(HP)outer casing,intermediate pressure(IP)outer casing and low pressure(LP)outer casing of steam turbine,and the composite heat transfer coefficient of the outer surface of the insulation structure and the outer surface of the LP outer casing were given.The calculation model of the heat transfer process of the steam pipe,the metal inner wall of the HP outer casing and the IP outer casing and the double-layer casing wall of the outer wall of the thermal insulation structure,the metal inner wall of the main stop valve,control valve and the double-layer spherical wall of the outer wall of the thermal insulation structure,and the single-layer cylinder wall of the LP outer casing of steam turbine were established.Considering that the inner surface temperature and outer surface temperature of the inner metal wall and the outer surface temperature of the outer wall of the thermal insulation structure were both undetermined,the iterative method was used to determine the surface temperature of these steam turbine components,the heat transfer coefficient and the heat flow density of the heat transfer process.The calculation and analysis of the external surface heat transfer coefficient of the steam pipes,main stop valve,control valve,HP outer casing,IP outer casing and LP outer casing of the steam turbine were completed.The calculation results of the heat transfer coefficient,heat flux density and equivalent surface heat transfer coefficient of the metal inner wall outer surface of these steam turbine components during the heat transfer process were obtained,providing heat transfer boundary conditions for finite element numerical calculation of temperature field and stress field of these steam turbine components.

关 键 词：汽轮机 蒸汽管道 主汽调节阀 汽缸 传热设计 传热系数 

分 类 号：TK2[动力工程及工程热物理—动力机械及工程]