基于声学法的磨煤机入口冷热混合风风速测量研究  

Study on the Measurement of Hot and Cold Mixed Air Velocity at the Inlet of Coal Mill Based on Acoustic Method

作　　者：储墨 杨柏依 赵亮 杨伟山 周宾[2] CHU Mo;YANG Baiyi;ZHAO Liang;YANG Weishan;ZHOU Bin(Huaneng Laiwu Power Generation Co.,Ltd.,Jinan 271100,China;School of Energy and Environment,Southeast University,Nanjing 210096,China)

机构地区：[1]华能莱芜发电有限公司,山东济南271100 [2]东南大学,江苏南京210096

出　　处：《山东电力技术》2020年第10期61-65,共5页Shandong Electric Power

摘　　要：在不影响磨煤机入口管道流场的前提下,基于声学法对锅炉磨煤机入口冷热风混合管道风速进行了实验测量。实验中扬声器和传声器分别交叉布置在圆形流道两侧,并与混合风的流动方向成一定角度。通过对背景噪声及现场环境分析,确定了声源频率为4~7 kHz,通过互相关时延估计算法,对声信号进行分析计算,得到混合风在传播过程中的准确飞渡时间,从而得到混合风的风速。结果表明:声学法能够准确对磨煤机冷热混合风速进行计算,测速结果能够满足电厂监测需求。On the premise of not affecting the flow field of the inlet pipe of the coal mill,based on the acoustic method,the air speed of the mixing pipe of the hot and cold air at the inlet of the coal mill was experimentally measured.In the experiment,the loudspeaker and the microphone are respectively arranged on both sides of the circular flow channel,and form a certain angle with the direction of air.Through the analysis of background noise and on-site environment,the frequency of the sound source is determined to be 4~7 kHz,and the sound signal is analyzed and calculated by the cross-correlation time delay estimation algorithm to obtain the accurate flight time in the process of air propagation,thereby obtaining the mixed air speed.The results show that the acoustic method can accurately calculate the air speed of the mixed air duct of the coal mill,which can meet the monitoring needs of the power plant.

关 键 词：声学法测速 磨煤机入口风速 互相关算法 衰减仿真 

分 类 号：TK313[动力工程及工程热物理—热能工程]