电站锅炉中声学测温的试验研究  

Experiment Study on Acoustic Pyrometry in Power Plant Boiler

作　　者：安连锁[1] 沈国清[1] 张波[1] 李科[1] 梁亚园 张达勋 

机构地区：[1]华北电力大学电站设备状态监测与控制教育部重点实验室 [2]张家口发电厂

出　　处：《电站系统工程》2007年第2期23-25,36,共4页Power System Engineering

基　　金：国家自然科学基金(10574043);教育部高等学校博士学科点专项科研基金(20050079004)

摘　　要：在国内某电厂的300MW机组锅炉上,利用炉墙上的观火孔,分别用扫频信号、白噪声信号和正弦信号进行了冷态下的声学测温试验。利用锅炉四管泄漏报警装置的测点,在电厂满负荷运行锅炉上进行了热态炉膛噪声测量和分析,发现炉膛噪声以频率为1000Hz以下的低频燃烧噪声为主,总声压级范围约为110～120dB。因此,当选用电动势声源时,建议使用频率范围为1K～10K的扫频信号,并适当缩短扫频周期和增大声功率。对声学测温技术的实际工程应用具有重要参考价值。Experiment on acoustic pyrometry is done using the chirp signal, white noise and sine wave respectively in a 300MW boiler in one domestic power plant, through fire hole on furnace wall. Furthermore, using the test point of four-tubes leaking monitoring system, the background noise in furnace is measured and analyzed when the boiler is under full load. It is found that the furnace noise is mainly of combustion noise with frequency below 1kHz and overall sound pressure between 110 and 120dB. Therefore, when electric sound source is chosen, the chirp signal with frequency from IK to 10K Hz is suggested. The chirp cycle can be reduced and the sound power can be improved aptly. It is important to the engineering application of acoustic pyrometry.

关 键 词：声学测温 炉膛 互相关 扫频信号 燃烧噪声 

分 类 号：TK311[动力工程及工程热物理—热能工程]