电站锅炉声学测温中时间延迟估计的仿真研究.pdf
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第 27卷 第 11期 中 国 电 机 工 程 学 报 Vol.27 No.11 Apr. 2007
2007年 4月 Proceedings of the CSEE ?2007 Chin.Soc.for Elec.Eng.
文章编号：0258-8013 (2007) 11-0057-05 中图分类号：TK31 文献标识码：A 学科分类号：470?20
电站锅炉声学测温中时间延迟估计的仿真研究
沈国清 1，安连锁 1，姜根山 1，梁亚园 2，张达勋 2
（1. 电站设备状态监测与控制教育部重点实验室(华北电力大学)，北京市 昌平区 102206；
2. 张家口发电厂，河北省 张家口市 075133）
Simulation of Time Delay Estimation in Acoustic Pyrometry in Power Plant Boiler
SHEN Guo-qing1, AN Lian-suo1, JIANG Gen-shan1, LIANG Ya-yuan2, ZHANG Da-xun2
(1.Key Laboratory of Condition Monitoring and Control for Power Plant Equipment (North China Electric Power University),
Ministry of Education,Changping District, Beijing 102206, China;
2. Zhangjiakou Power Plant, Zhangjiakou 075133, Hebei Province, China)
ABSTRACT: In order to acquire the accurate transmitted time
of sound wave in power plant furnace in acoustic pyrometry,
the time delay estimation (TDE) of weak sound signal under the
condition of strong noise is studied. Spectral analysis and
statistic analysis of the background noise in furnace, acquired
from a power plant boiler in China, are done. The result shows
that the background noise in furnace is dominated by the
combustion noise with center frequency from 250 to 1000 Hz
and with Gaussian-like distribution. The disadvantages of some
traditional methods of TDE are shown. A new TDE method
based on high-order cumulant is given. The acquired
background noise in furnace is added to signal with exponential
distribution. One hundred Monte-Carlo simulation tests of TDE
are done based on the ML cross-correlation method and
high-order cumulant method respectively under different signal
noise ratio (SNR). The result shows that the influence of
correlated Gaussian noise can be restrained from the
non-Gaussian signal based on the third-order cumulant method
even under poor SNR. It is useful to the measurement of
transmitted time of sound wave in acoustic pyrometry and to
the sound source location of fou
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