Application of Lamb Wave in Detecting Boiler Heating Surfaces
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摘要: 为提高火电厂锅炉受热面管检测的可靠性和效率，研究了针对受热面管吹损的超声兰姆波检测技术。以4.00 mm壁厚的管材为例，通过求解频散方程，分析了兰姆波传播的频散特性。结果表明：声束入射角为35.2°，激励频率为500 kHz时，对于未发生吹损的管材，S0和A0模态的端面回波在时间域上会连续叠加；对于发生吹损的管材，S0和A0模态的端面回波在时间域上存在间隔，通过时间间隔可判断吹损程度。试验结果为火电厂锅炉受热面管的检测提供了一种高效高精度的无损检测方法。Abstract: To increase the reliability and efficiency of ultrasonic inspection for the boiler heating surfaces, the ultrasonic lamb waves and their applications to the blowing inspection of blowing damages of heating surfaces were studied. The dispersion characteristics of lamb waves were analyzed by solving the dispersion equations in the pipes with a thickness of 4.00mm. The results showed that the echoes of S0 and A0 modes in the end face of non-blowing pipes were superimposed continuously at time domain, while the situation was different in the blowing pipes as the incident angle being 35.2° and the frequency being 500 kHz, and the extent of blowing damages in the pipes was decided by time interval of the two modes. A high accuracy and precision non-destructive testing method for the boiler heating surfaces was provided.
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Keywords:
- Lamb wave /
- noiler heating surfaces /
- blowing damage /
- dispersion analysis
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