电站锅炉声学测温中时延估计试验研究  

Study on Time Delay Estimation in Acoustic Temperature Measurement of Power Boilers

作　　者：安连锁[1] 张世平[1] 李庚生[1] 沈国清[1] 冯强[1] 邓喆[1] 许伟龙[1] 

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,北京102206

出　　处：《动力工程学报》2012年第3期197-203,共7页Journal of Chinese Society of Power Engineering

基　　金：国家自然科学基金资助项目(50976034);中央高校基本科研业务费专项资金资助项目(09QG43)

摘　　要：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.Sound field in boiler furnace was analyzed at both cold and hot state,while the time delay estimation（TDE） based on generalized cross-correlation（GCC） and related weighting functions studied theoretically.Acoustic pyrometers were installed in the boiler furnace of a domestic 300 MW unit,with which cold-and hot-state experiments were carried out using different weighting functions.Results show that the GCC-TDE method may be used for measurement of sound travel-time by acoustic technology.The GCC-TDE method weighted by PHAT can suppress sound reverberation,which may therefore help to obtain accurate TDE in cold-state reverberation conditions of boiler;whereas the method weighted by ML is suitable for measurement of sound travel-time in hot-state conditions,due to its robust anti-noise capability.

关 键 词：电站锅炉 声学测温 时延估计 广义互相关 冷态 热态 

分 类 号：TK311[动力工程及工程热物理—热能工程]