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对锅炉炉膛冷态和热态声场进行了分析,从理论上对广义互相关时延估计及其加权函数进行了深入探讨,并在国内某300MW机组上安装声学测点,对不同的加权函数进行了冷态和热态试验研究.结果表明:广义互相关时延估计法可以用于声学测温中声波飞渡时间的测量;PHAT加权具有抗混响能力,能在锅炉冷态混响环境下得到准确的时延估计;ML加权具有很好的抗噪能力,能在锅炉热态时得到准确的声波飞渡时间.
The analysis of the cold state and the hot state sound field in the boiler hearth is made. The time delay estimation of generalized cross correlation and its weighting function are discussed theoretically. Acoustic measuring points are installed on a 300 MW unit in China. Different weighting functions are performed The experimental results show that the generalized cross-correlation time delay estimation method can be used to measure the acoustic transit time in acoustic temperature measurement. The PHAT weighting has the anti-reverberation capability and can be used in the boiler reverberation environment Get accurate time delay estimation; ML weighting has very good anti-noise ability, can get the accurate sonic flight time in the boiler hot state.