Experimental Investigation Into Thermal Behavior of Steam Turbine Components—Temperature Measurements With Optical Probes and Natural Cooling Analysis
Experimental Investigation Into Thermal Behavior of Steam Turbine Components—Temperature Measurements With Optical Probes and Natural Cooling Analysis
复制标题
汽轮机部件热行为实验研究——光学探头温度测量和自然冷却分析
DOI：
10.1115/1.4025556
复制
发表时间：
2014
影响因子：
1.5
通讯作者：
M. Sell
中科院分区：
文献类型：
--
作者：
G. Marinescu;W. Mohr;A. Ehrsam;P. Ruffino;M. Sell
汽轮机冷却时间对循环疲劳寿命有显着影响。静止后较低的初始金属温度会导致下次启动时需要克服较高的温差。一般来说，较低的初始金属温度会导致较高的启动应力。为了优化蒸汽轮机的循环运行，必须充分了解自然冷却，这对于转子来说尤其具有挑战性。本文首次应用二维数值程序来评估自然冷却期间的热状态，包括转子、壳体、阀门和主管。冷却计算的概念是用对金属部件产生相同热效应的等效流体电导率来代替自然冷却期间的流体总浮力。根据实验数据计算流体等效电导率。涡轮机温度通过转子上的高温探头以及内壳和外壳上的标准热电偶进行测量。高温探头通过热井上的标准温度测量进行校准，其中测量了蒸汽透射率和转子金属透射率。
The steam turbine cooldown has a significant impact on the cyclic fatigue life. A lower initial metal temperature after standstill results in a higher temperature difference to be overcome during the next start-up. Generally, lower initial metal temperatures result in higher start-up stress. In order to optimize steam turbines for cyclic operation, it is essential to fully understand natural cooling, which is especially challenging for rotors. This paper presents a first-in-time application of a 2D numerical procedure for the assessment of the thermal regime during natural cooling, including the rotors, casings, valves, and main pipes. The concept of the cooling calculation is to replace the fluid gross buoyancy during natural cooling by an equivalent fluid conductivity that gives the same thermal effect on the metal parts. The fluid equivalent conductivity is calculated based on experimental data. The turbine temperature was measured with pyrometric probes on the rotor and with standard thermocouples on inner and outer casings. The pyrometric probes were calibrated with standard temperature measurements on a thermo well, where the steam transmittance and the rotor metal transmissivity were measured.