Acoustic Emission Detection On-Line and Evaluation for Heat Exchanger Tube Sheet
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摘要: 换热器管板属于多孔结构，制造工艺复杂，容易产生缺陷，且管板与换热管连接处连接质量不易检查。针对上述问题，采用声发射检测技术，将传感器通过专用波导杆与换热管连接，根据衰减测量结果确定管板上传感器的布置阵列。通过壳程水压试验二次加载方式对其进行声发射检测。采取区域定位方法，通过对不同阶段保压信号的分析，综合考虑声发射信号的活性和强度，制定了换热器管板声发射检测及评价方法，实现了对换热器管板质量的分级评价。Abstract: The tube sheet of the heat exchanger is a pore plate. The complex manufacturing process causes the plate to easily contain many kinds of defects. In addition, the joints between tube sheet and tubes are difficult to detect. To overcome the problem mentioned above, acoustic emission(AE) testing technology is used for its ability on structure testing. The sensors are connected with heat exchange tubes with special wave guide rods, and the array arrangement is referred to the results of attenuation measurement. Acoustic emission testing is carried out in two cycle hydrostatic test of shell side. After the analysis of different pressure maintaining stages signals with zone location method, taking AE signal activity and intensity into account, the AE testing and evaluation method of tube sheet is established. With this method, the grade of tube sheet can be identified.
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