伪随机序列声源信号在电站锅炉声学测温中的应用  

Application of Pseudo-random Sequence Signal in Acoustic Pyrometry of Boiler Furnace

作　　者：张世平[1] 安连锁[1] 李庚生[1] 沈国清[1] 冯强[1] 邓喆[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5期378-382,共5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：为了获得电站锅炉炉膛温度信息,开发了单路径炉膛烟气温度声学监测系统,引入伪随机序列作为声源信号.在国内某200MW和300MW锅炉上进行了热态试验研究,并利用自制的K型陶瓷热电偶对测量温度进行了标定.结果表明:伪随机序列信号可以作为声学测温的声源信号,但由于其频带过宽,必须进行处理,使其能量集中;测温系统测量的烟气温度与热电偶测量温度相比,误差在2%以内;基于伪随机序列声源的声学测温系统所测温度曲线与负荷曲线吻合,具有很好的稳定性.To obtain the temperature field in boiler furnace,a single-path monitoring system was developed for temperature measurement of flue gas in boiler furnace using pseudo-random sequence signal.Hot-state experiments were carried out for two boilers of respectively 200 MW and 300 MW,of which the measurements were verified by self-developed K ceramic thermocouples.Results show that the pseudo-random sequence signal can be taken as sound source signal in acoustic pyrometry after its too broad bandwidth is narrowed so as to concentrate the energy.The measurement error between acoustic pyrometry and thermocouple method is within 2%,and the curve of temperature measured by acoustic pyrometry using pseudo-random sequence signal agrees well with that of the unit load,proving the measurements to be reliable.

关 键 词：伪随机序列 电站锅炉 声源 热电偶 声学测温 

分 类 号：TK224[动力工程及工程热物理—动力机械及工程]