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为了对电站锅炉声学测温中的声源进行选择,借助冷态实验台对扫频信号进行了试验研究,并在国内某300 MW锅炉上进行了热态试验.为了确保其准确性,同时利用热电偶进行了热态温度标定.结果表明:线性扫频信号适合作为电站锅炉声学测温中的声源信号;500~3 000 Hz频率段的扫频信号作为声源最为适宜;扫频信号的频率区间越小,互相关时延估计效果越差;扫频周期取0.1 s最为合适;线性扫频信号成功地在300 MW锅炉声学测温系统中得以应用,可为电厂锅炉声学测温的研究提供重要的参考.
In order to choose the sound source in the boiler acoustic acoustic temperature measurement, the sweep signal was experimentally studied by means of a cold bench, and the thermal test was carried out on a 300 MW boiler in China.In order to ensure its accuracy, The results show that the linear sweep signal is suitable as sound source signal in the acoustic temperature measurement of power plant boilers. The swept frequency signal of 500-3000 Hz is most suitable as the sound source. The sweep signal The smaller the frequency range is, the worse the effect of cross-correlation delay estimation is. The swept cycle is the most suitable for 0.1 s. The linear sweep signal is successfully applied to 300 MW boiler acoustic temperature measurement system, which can be used to study the acoustic temperature measurement of power plant boilers Provide important reference.