非接触式汽轮机转子表面温度直接测量方法研究

A Study of a Non-contact Type Direct Method for Measuring Turbine Rotor Surface Temperatures

转子表面温度的精确测量对高参数汽轮机组安全、经济运行具有重要意义,而比色测温良好的抗干扰性使其在中高温测量领域有很好的应用前景。针对上述问题,提出了利用光纤传导和比色原理直接检测汽轮机转子表面温度的测量方案。研究认为,选用工作波段位于3.8μm附近的Pb-Se探测器,测温系统可工作于300～800℃范围,能有效消除蒸汽环境对转子壁温的干扰,且测温误差小,适合汽轮机转子表面温度测量的需要;采用小直径红外光纤传导这一技术手段有望解决高参数环境对测量系统的影响。

A precise measurement of rotor surface temperatures is of major importance for the safe and economic operation of high-parameter steam turbines.A good anti-interference performance makes it possible for colorimetric temperature measurements to enjoy a splendid use prospect in high and intermediate temperature measurement applications.In the light of the foregoing,a measurement method was proposed to directly test the turbine rotor surface temperature by using optical fiber conduction and colorimetric theory.It has been found that if a PbSe detector working in a wave band around 3.8 μm is chosen,the temperature measurement system can operate in a range from 300 ℃ to 800 ℃,capable of effectively eliminating the interference of steam environment on the rotor wall temperatures,resulting in a relatively small temperature measurement error and meeting the needs for turbine rotor surface-temperature measurements.The influence of high parameter environment on the measurement system can hopefully be solved by using the technical means of small-diameter infrared optical fiber conduction.